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235 KiB
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class=tag-list-link href=/tags/Spring/ rel=tag>Spring</a><span class=tag-list-count>7</span><li class=tag-list-item><a class=tag-list-link href=/tags/Spring-Event/ rel=tag>Spring Event</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/SpringBoot/ rel=tag>SpringBoot</a><span class=tag-list-count>22</span><li class=tag-list-item><a class=tag-list-link href=/tags/Sql%E6%B3%A8%E5%85%A5/ rel=tag>Sql注入</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Stream/ rel=tag>Stream</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Synchronized/ rel=tag>Synchronized</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/Thread-dump/ rel=tag>Thread dump</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/ThreadLocal/ rel=tag>ThreadLocal</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/ThreadPool/ rel=tag>ThreadPool</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Tomcat/ rel=tag>Tomcat</a><span class=tag-list-count>13</span><li class=tag-list-item><a class=tag-list-link href=/tags/Trapping-Rain-Water/ rel=tag>Trapping Rain Water</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/WeakReference/ rel=tag>WeakReference</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Web/ rel=tag>Web</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Webhook/ rel=tag>Webhook</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/Windows/ rel=tag>Windows</a><span class=tag-list-count>5</span><li class=tag-list-item><a class=tag-list-link href=/tags/WordPress/ rel=tag>WordPress</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/aqs/ rel=tag>aqs</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/await/ rel=tag>await</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/bloom-filter/ rel=tag>bloom filter</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/c/ rel=tag>c++</a><span class=tag-list-count>14</span><li class=tag-list-item><a class=tag-list-link href=/tags/cglib/ rel=tag>cglib</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/cgroup/ rel=tag>cgroup</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/cluster/ rel=tag>cluster</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/condition/ rel=tag>condition</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/dnsmasq/ rel=tag>dnsmasq</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/docker/ rel=tag>docker</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/dp/ rel=tag>dp</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/dubbo/ rel=tag>dubbo</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/echo/ rel=tag>echo</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/environment/ rel=tag>environment</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/gap-lock/ rel=tag>gap lock</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/gc/ rel=tag>gc</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/git/ rel=tag>git</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/grep/ rel=tag>grep</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/hadoop/ rel=tag>hadoop</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/headscale/ rel=tag>headscale</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/hexo/ rel=tag>hexo</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/icu4c/ rel=tag>icu4c</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/im/ rel=tag>im</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/is-not-null/ rel=tag>is not null</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/is-null/ rel=tag>is null</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/j-u-c/ rel=tag>j.u.c</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/java/ rel=tag>java</a><span class=tag-list-count>36</span><li class=tag-list-item><a class=tag-list-link href=/tags/jvm/ rel=tag>jvm</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/leetcode/ rel=tag>leetcode</a><span class=tag-list-count>40</span><li class=tag-list-item><a class=tag-list-link href=/tags/leetcode-155/ rel=tag>leetcode 155</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/linked-list/ rel=tag>linked list</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/linux/ rel=tag>linux</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/lock/ rel=tag>lock</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/mfc/ rel=tag>mfc</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/min-stack/ rel=tag>min stack</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/mq/ rel=tag>mq</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/mvcc/ rel=tag>mvcc</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/mysql/ rel=tag>mysql</a><span class=tag-list-count>7</span><li class=tag-list-item><a class=tag-list-link href=/tags/namespace/ rel=tag>namespace</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/nas/ rel=tag>nas</a><span class=tag-list-count>6</span><li class=tag-list-item><a class=tag-list-link href=/tags/next-key-lock/ rel=tag>next-key lock</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/nginx/ rel=tag>nginx</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/nullsfirst/ rel=tag>nullsfirst</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/openresty/ rel=tag>openresty</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/php/ rel=tag>php</a><span class=tag-list-count>5</span><li class=tag-list-item><a class=tag-list-link href=/tags/powershell/ rel=tag>powershell</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/procedure/ rel=tag>procedure</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/python/ rel=tag>python</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/read-view/ rel=tag>read view</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/redis/ rel=tag>redis</a><span class=tag-list-count>12</span><li class=tag-list-item><a class=tag-list-link href=/tags/scp/ rel=tag>scp</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/signal/ rel=tag>signal</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/sort/ rel=tag>sort</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/spark/ rel=tag>spark</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/ssh/ rel=tag>ssh</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/stack/ rel=tag>stack</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/stream/ rel=tag>stream</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/string/ rel=tag>string</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/swoole/ rel=tag>swoole</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/top/ rel=tag>top</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/uname/ rel=tag>uname</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/unlock/ rel=tag>unlock</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/utf8/ rel=tag>utf8</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/utf8mb4/ rel=tag>utf8mb4</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/utf8mb4-0900-ai-ci/ rel=tag>utf8mb4_0900_ai_ci</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/utf8mb4-general-ci/ rel=tag>utf8mb4_general_ci</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/utf8mb4-unicode-ci/ rel=tag>utf8mb4_unicode_ci</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/value/ rel=tag>value</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/websocket/ rel=tag>websocket</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/windows/ rel=tag>windows</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/wsl/ rel=tag>wsl</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/zookeeper/ rel=tag>zookeeper</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/zsh/ rel=tag>zsh</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%B8%89%E9%98%B6%E6%AE%B5%E6%8F%90%E4%BA%A4/ rel=tag>三阶段提交</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%B8%8D%E5%8F%AF%E5%8F%98%E5%BC%95%E7%94%A8/ rel=tag>不可变引用</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%B8%9C%E4%BA%AC%E5%A5%A5%E8%BF%90%E4%BC%9A/ rel=tag>东京奥运会</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%B8%A4%E9%98%B6%E6%AE%B5%E6%8F%90%E4%BA%A4/ rel=tag>两阶段提交</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%B8%AD%E5%B1%B1%E8%B7%AF/ rel=tag>中山路</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%B8%AD%E5%BA%8F/ rel=tag>中序</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%B8%AD%E9%97%B4%E4%BB%B6/ rel=tag>中间件</a><span class=tag-list-count>4</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%B8%BE%E9%87%8D/ rel=tag>举重</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%B9%92%E4%B9%93%E7%90%83/ rel=tag>乒乓球</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%BA%8B%E5%8A%A1/ rel=tag>事务</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%BA%8C%E5%8F%89%E6%A0%91/ rel=tag>二叉树</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%BA%91%E6%9C%8D%E5%8A%A1%E5%99%A8/ rel=tag>云服务器</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%BA%92%E6%96%A5%E9%94%81/ rel=tag>互斥锁</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%BB%A3%E7%A0%81%E9%A2%98%E8%A7%A3/ rel=tag>代码题解</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E4%BF%AE%E7%94%B5%E8%84%91%E7%9A%84/ rel=tag>修电脑的</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%81%8F%E5%90%91%E9%94%81/ rel=tag>偏向锁</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%81%A5%E5%BA%B7%E7%A0%81/ rel=tag>健康码</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%85%AC%E4%BA%A4/ rel=tag>公交</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%85%AC%E4%BA%A4%E8%BD%A6/ rel=tag>公交车</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%86%85%E5%AD%98%E5%88%86%E5%B8%83/ rel=tag>内存分布</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F/ rel=tag>内存泄漏</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%87%86%E5%A4%87/ rel=tag>准备</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%87%8F%E8%82%A5/ rel=tag>减肥</a><span class=tag-list-count>7</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%88%86%E5%B8%83%E5%BC%8F%E4%BA%8B%E5%8A%A1/ rel=tag>分布式事务</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%88%86%E5%B8%83%E5%BC%8F%E9%94%81/ rel=tag>分布式锁</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%88%87%E7%89%87/ rel=tag>切片</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%88%9D%E5%A7%8B%E5%8C%96/ rel=tag>初始化</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%89%8A%E5%B3%B0%E5%A1%AB%E8%B0%B7/ rel=tag>削峰填谷</a><span class=tag-list-count>4</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%89%8D%E5%BA%8F/ rel=tag>前序</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%8A%A0%E5%A1%9E/ rel=tag>加塞</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%8A%A0%E8%BD%BD/ rel=tag>加载</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%8D%95%E4%BE%8B/ rel=tag>单例</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%8D%9A%E5%AE%A2%EF%BC%8C%E6%96%87%E7%AB%A0/ rel=tag>博客，文章</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%8E%A6%E9%97%A8/ rel=tag>厦门</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%8F%8C%E4%BA%B2%E5%A7%94%E6%B4%BE/ rel=tag>双亲委派</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%8F%91%E8%A1%8C%E7%89%88/ rel=tag>发行版</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%8F%A3%E7%BD%A9/ rel=tag>口罩</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%8F%AF%E5%8F%98%E5%BC%95%E7%94%A8/ rel=tag>可变引用</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%90%90%E6%A7%BD/ rel=tag>吐槽</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%9B%A4%E7%89%A9%E8%B5%84/ rel=tag>囤物资</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6/ rel=tag>垃圾回收</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%9F%BA%E7%A1%80%E8%AE%BE%E6%96%BD/ rel=tag>基础设施</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%A4%A7%E6%89%AB%E9%99%A4/ rel=tag>大扫除</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%AD%97%E7%AC%A6%E9%9B%86/ rel=tag>字符集</a><span 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class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%B9%B2%E6%B4%BB/ rel=tag>干活</a><span class=tag-list-count>6</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%B9%B4%E4%B8%AD%E6%80%BB%E7%BB%93/ rel=tag>年中总结</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%B9%B4%E7%BB%88%E6%80%BB%E7%BB%93/ rel=tag>年终总结</a><span class=tag-list-count>4</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%B9%B6%E5%8F%91/ rel=tag>并发</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%B9%B8%E7%A6%8F%E4%BA%86%E5%90%97/ rel=tag>幸福了吗</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%B9%BB%E8%AF%BB/ rel=tag>幻读</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%BA%94%E7%94%A8/ rel=tag>应用</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%BC%80%E8%BD%A6/ rel=tag>开车</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%BC%B1%E5%BC%95%E7%94%A8/ rel=tag>弱引用</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E5%BD%B1%E8%AF%84/ rel=tag>影评</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%89%80%E6%9C%89%E6%9D%83/ rel=tag>所有权</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%89%93%E5%8D%A1/ rel=tag>打卡</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%89%B6%E6%A2%AF/ rel=tag>扶梯</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%8A%80%E6%9C%AF/ rel=tag>技术</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%8B%96%E6%9B%B4/ rel=tag>拖更</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%8D%A2%E8%BD%A6%E7%89%8C/ rel=tag>换车牌</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%8E%92%E5%BA%8F/ rel=tag>排序</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%8E%A5%E9%9B%A8%E6%B0%B4/ rel=tag>接雨水</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%95%B0%E6%8D%AE%E6%BA%90%E5%8A%A8%E6%80%81%E5%88%87%E6%8D%A2/ rel=tag>数据源动态切换</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84/ rel=tag>数据结构</a><span class=tag-list-count>11</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%96%B0%E8%AF%AD%E8%A8%80/ rel=tag>新语言</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%97%85%E6%B8%B8/ rel=tag>旅游</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%97%A5%E5%BF%97/ rel=tag>日志</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%9B%BE%E5%8E%9D%E5%9E%B5/ rel=tag>曾厝垵</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%9C%80%E5%B0%8F%E6%A0%88/ rel=tag>最小栈</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%9D%80%E4%BA%BA%E8%AF%9B%E5%BF%83/ rel=tag>杀人诛心</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%9D%AD%E5%B7%9E/ rel=tag>杭州</a><span class=tag-list-count>4</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%A0%87%E8%AE%B0%E6%95%B4%E7%90%86/ rel=tag>标记整理</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%A4%8D%E7%89%A9%E5%9B%AD/ rel=tag>植物园</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%B2%99%E8%8C%B6%E9%9D%A2/ rel=tag>沙茶面</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%B3%A8%E8%A7%A3/ rel=tag>注解</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%B5%B7%E8%9B%8E%E7%85%8E/ rel=tag>海蛎煎</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%B6%88%E6%81%AF%E9%98%9F%E5%88%97/ rel=tag>消息队列</a><span class=tag-list-count>9</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%B7%98%E6%B1%B0%E7%AD%96%E7%95%A5/ rel=tag>淘汰策略</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%B7%B1%E5%BA%A6%E5%AD%A6%E4%B9%A0/ rel=tag>深度学习</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%BA%90%E7%A0%81/ rel=tag>源码</a><span class=tag-list-count>11</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E6%BA%90%E7%A0%81%E8%A7%A3%E6%9E%90/ rel=tag>源码解析</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%94%9F%E6%B4%BB/ rel=tag>生活</a><span class=tag-list-count>42</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%94%B5%E7%93%B6%E8%BD%A6/ rel=tag>电瓶车</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%96%AB%E6%83%85/ rel=tag>疫情</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%9C%8B%E4%B9%A6/ rel=tag>看书</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%9C%8B%E5%89%A7/ rel=tag>看剧</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%9F%A9%E9%98%B5/ rel=tag>矩阵</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%AB%AF%E5%8F%A3%E8%BD%AC%E5%8F%91/ rel=tag>端口转发</a><span class=tag-list-count>3</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%B1%BB%E5%8A%A0%E8%BD%BD/ rel=tag>类加载</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%B3%9F%E5%BF%83%E4%BA%8B/ rel=tag>糟心事</a><span class=tag-list-count>5</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%B4%A2%E5%BC%95/ rel=tag>索引</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%BA%BF%E7%A8%8B%E6%B1%A0/ rel=tag>线程池</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%BC%93%E5%AD%98/ rel=tag>缓存</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%BC%93%E5%AD%98%E5%87%BB%E7%A9%BF/ rel=tag>缓存击穿</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%BC%93%E5%AD%98%E7%A9%BF%E9%80%8F/ rel=tag>缓存穿透</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%BC%93%E5%AD%98%E9%9B%AA%E5%B4%A9/ rel=tag>缓存雪崩</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%BC%96%E7%A0%81/ rel=tag>编码</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E7%BE%8E%E5%9B%BD/ rel=tag>美国</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%80%81%E7%94%B5%E8%84%91/ rel=tag>老电脑</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%87%AA%E5%8A%A8%E8%A3%85%E9%85%8D/ rel=tag>自动装配</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%87%AA%E6%97%8B/ rel=tag>自旋</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%87%AA%E9%80%82%E5%BA%94%E6%8B%93%E5%B1%95/ rel=tag>自适应拓展</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%A3%85%E7%94%B5%E8%84%91/ rel=tag>装电脑</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%A7%84%E5%88%99/ rel=tag>规则</a><span class=tag-list-count>4</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%A7%A3%E6%9E%90/ rel=tag>解析</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F/ rel=tag>设计模式</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%AF%BB%E4%B9%A6/ rel=tag>读书</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%AF%BB%E5%90%8E%E6%84%9F/ rel=tag>读后感</a><span class=tag-list-count>4</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%B4%9F%E8%BD%BD%E5%9D%87%E8%A1%A1/ rel=tag>负载均衡</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%B6%B3%E7%90%83/ rel=tag>足球</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%B7%91%E6%AD%A5/ rel=tag>跑步</a><span class=tag-list-count>7</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%B7%AF%E6%94%BF%E8%A7%84%E5%88%92/ rel=tag>路政规划</a><span class=tag-list-count>2</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%B7%AF%E7%94%B1%E5%99%A8/ rel=tag>路由器</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%B7%B3%E6%B0%B4/ rel=tag>跳水</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%B8%A9%E8%B8%8F/ rel=tag>踩踏</a><span class=tag-list-count>1</span><li class=tag-list-item><a class=tag-list-link href=/tags/%E8%BD%AC%E4%B9%89/ rel=tag>转义</a><span 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Nicksxs's Blog" itemprop=name><meta itemprop=description></span><header class=post-header><h2 itemprop="name headline" class=post-title><a class=post-title-link href=/2023/12/31/php-%E7%9A%84%E8%B0%83%E8%AF%95%E6%96%B9%E6%B3%95-%E6%9F%A5%E7%9C%8B%E8%B0%83%E7%94%A8%E5%A0%86%E6%A0%88/ itemprop=url>php 的调试方法-查看调用堆栈</a></h2><div class=post-meta-container><div class=post-meta><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-calendar"></i> </span><span class=post-meta-item-text>发表于</span> <time itemprop="dateCreated datePublished" title="创建时间：2023-12-31 21:49:36 / 修改时间：21:52:02" datetime=2023-12-31T21:49:36+08:00>2023-12-31</time> </span><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-folder"></i> </span><span class=post-meta-item-text>分类于</span> <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/php/ itemprop=url rel=index><span itemprop=name>php</span></a> </span></span><span class="post-meta-item leancloud_visitors" data-flag-title="php 的调试方法-查看调用堆栈" id=/2023/12/31/php-%E7%9A%84%E8%B0%83%E8%AF%95%E6%96%B9%E6%B3%95-%E6%9F%A5%E7%9C%8B%E8%B0%83%E7%94%A8%E5%A0%86%E6%A0%88/ title=阅读次数><span class=post-meta-item-icon><i class="far fa-eye"></i> </span><span class=post-meta-item-text>阅读次数：</span> <span class=leancloud-visitors-count></span> </span><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-comment"></i> </span><span class=post-meta-item-text>Disqus：</span> <a href=/2023/12/31/php-%E7%9A%84%E8%B0%83%E8%AF%95%E6%96%B9%E6%B3%95-%E6%9F%A5%E7%9C%8B%E8%B0%83%E7%94%A8%E5%A0%86%E6%A0%88/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2023/12/31/php-的调试方法-查看调用堆栈/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><p>php 代码调试里的神器就是 <code>echo 111;exit;</code> 但是对于使用了接口和继承比较多的话，有时候比较难找，可能定位到了一段代码但是不知道怎么调用过来的，这时候就可以用这个方法<p>总结下来有三种，<h2 id=第一种是最巧妙的><a class=headerlink href=#第一种是最巧妙的 title=第一种是最巧妙的></a>第一种是最巧妙的</h2><pre class="line-numbers language-php" data-language=php><code class=language-php><span class="token keyword">function</span> <span class="token function-definition function">a</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">echo</span> <span class="token number">111</span><span class="token punctuation">;</span><span class="token keyword">exit</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span></span></code></pre><p>比如本来是上面这样子，那么其实我们可以主动new 个异常<pre class="line-numbers language-php" data-language=php><code class=language-php><span class="token keyword">function</span> <span class="token function-definition function">a</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token variable">$e</span> <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Exception</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token function">print_r</span><span class="token punctuation">(</span><span class="token variable">$e</span><span class="token operator">-></span><span class="token function">getTraceAsString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">echo</span> <span class="token number">111</span><span class="token punctuation">;</span><span class="token keyword">exit</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>这样我的 trace 调用链路就出来了<h2 id=第二种><a class=headerlink href=#第二种 title=第二种></a>第二种</h2><p>这个就是比较简单的，调用 php 自身提供的方法<pre class="line-numbers language-php" data-language=php><code class=language-php><span class="token function">debug_backtrace</span><span class="token punctuation">(</span><span class="token keyword type-hint">int</span> <span class="token variable">$options</span> <span class="token operator">=</span> <span class="token constant">DEBUG_BACKTRACE_PROVIDE_OBJECT</span><span class="token punctuation">,</span> <span class="token keyword type-hint">int</span> <span class="token variable">$limit</span> <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">:</span> <span class="token keyword return-type">array</span><span aria-hidden=true class=line-numbers-rows><span></span></span></code></pre><p>第一个参数是个掩码<table><thead><tr><th>debug_backtrace()<th>Populates both indexes<tbody><tr><td>debug_backtrace(DEBUG_BACKTRACE_PROVIDE_OBJECT)<td><tr><td>debug_backtrace(1)<td><tr><td>debug_backtrace(0)<td>Omits index <code>"object"</code> and populates index <code>"args"</code>.<tr><td>debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS)<td>Omits index <code>"object"</code> <em>and</em> index <code>"args"</code>.<tr><td>debug_backtrace(2)<td><tr><td>debug_backtrace(DEBUG_BACKTRACE_PROVIDE_OBJECT<td>DEBUG_BACKTRACE_IGNORE_ARGS)<tr><td>debug_backtrace(3)<td></table><p>第二个参数是限制栈深度<h3 id=第三种><a class=headerlink href=#第三种 title=第三种></a>第三种</h3><p>这个也是用自身的方法<pre class="line-numbers language-php" data-language=php><code class=language-php><span class="token function">debug_print_backtrace</span><span class="token punctuation">(</span><span class="token keyword type-hint">int</span> <span class="token variable">$options</span> <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token keyword type-hint">int</span> <span class="token variable">$limit</span> <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">:</span> <span class="token keyword return-type">void</span><span aria-hidden=true class=line-numbers-rows><span></span></span></code></pre><p>这里的第一个参数只有一个可以传的<table><thead><tr><th>DEBUG_BACKTRACE_IGNORE_ARGS<th>Whether or not to omit the “args” index, and thus all the function/method arguments, to save memory.</thead></table><p>就是隐藏参数，不然如果对于一些框架代码，这个打印会非常大，需要注意下</div><footer class=post-footer><div class=post-eof></div></footer></article></div><div class=post-block><article class=post-content itemscope itemtype=http://schema.org/Article><link href=https://nicksxs.me/2023/12/24/%E9%98%BF%E9%87%8C%E4%BA%91-rds-%E4%B8%BB%E4%BB%8E%E5%BB%B6%E8%BF%9F%E6%8E%92%E6%9F%A5/ itemprop=mainEntityOfPage><span hidden itemprop=author itemscope itemtype=http://schema.org/Person><meta content=/uploads/avatar.jpg itemprop=image><meta content=Nicksxs itemprop=name></span><span hidden itemprop=publisher itemscope itemtype=http://schema.org/Organization><meta content="Nicksxs's Blog" itemprop=name><meta content="learn from zero,技术博客，Nicksxs，史学森" itemprop=description></span><span hidden itemprop=post itemscope itemtype=http://schema.org/CreativeWork><meta content="undefined | Nicksxs's Blog" itemprop=name><meta itemprop=description></span><header class=post-header><h2 itemprop="name headline" class=post-title><a class=post-title-link href=/2023/12/24/%E9%98%BF%E9%87%8C%E4%BA%91-rds-%E4%B8%BB%E4%BB%8E%E5%BB%B6%E8%BF%9F%E6%8E%92%E6%9F%A5/ itemprop=url>阿里云 rds 主从延迟排查</a></h2><div class=post-meta-container><div class=post-meta><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-calendar"></i> </span><span class=post-meta-item-text>发表于</span> <time itemprop="dateCreated datePublished" title="创建时间：2023-12-24 20:48:08" datetime=2023-12-24T20:48:08+08:00>2023-12-24</time> </span><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-folder"></i> </span><span class=post-meta-item-text>分类于</span> <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/Mysql/ itemprop=url rel=index><span itemprop=name>Mysql</span></a> </span></span><span class="post-meta-item leancloud_visitors" data-flag-title="阿里云 rds 主从延迟排查" id=/2023/12/24/%E9%98%BF%E9%87%8C%E4%BA%91-rds-%E4%B8%BB%E4%BB%8E%E5%BB%B6%E8%BF%9F%E6%8E%92%E6%9F%A5/ title=阅读次数><span class=post-meta-item-icon><i class="far fa-eye"></i> </span><span class=post-meta-item-text>阅读次数：</span> <span class=leancloud-visitors-count></span> </span><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-comment"></i> </span><span class=post-meta-item-text>Disqus：</span> <a href=/2023/12/24/%E9%98%BF%E9%87%8C%E4%BA%91-rds-%E4%B8%BB%E4%BB%8E%E5%BB%B6%E8%BF%9F%E6%8E%92%E6%9F%A5/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2023/12/24/阿里云-rds-主从延迟排查/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><p>昨天同学问我是不是数据库主从延迟有点高，可能有一分多钟，然后我就去看了rds 的监控，发现主实例上的监控显示的延迟才 1.2 秒，而且是最高 1.2 秒，感觉这样的话应该就没啥问题，然后同学跟我说他加了日志，大致的逻辑是主库数据落库以后就会发一条 mq 消息出来，然后消费者接收到以后回去从库查一下这个数据，结果发现延迟了 90 多秒才查到数据，这种情况比较可能的猜测是阿里云这个监控的逻辑可能是从库在获得第一条同步数据的时候，而不是最终同步完成，但是跟阿里云咨询了并不是，使用的就是 <code>show slave status</code> 结果里的 <code>Seconds_Behind_Master</code> 指标，那这第一种情况就否定掉了，这里其实是犯了个错误，应该去从库看这个延迟的，不过对于阿里云来说在 rds 监控是看不到从库的监控的，只能到 das，也就是阿里云的数据库自治服务可以看到，这里能看到从库的延迟监控，发现的确有这么高，这样就要考虑为啥会出现这种情况，阿里云同学反馈的是这段时间的 iops 很高，并且 cpu 也比较高，让我排查下 binlog，这里就碰到一个小问题，阿里云 rds 的线上实例我们没法在本地连接，并且密码也是在代码里加密过的，去服务器上连接一方面需要装 mysql 客户端，另一方面是怕拉取日志会有性能影响，幸好阿里云这点做的比较好，在 rds 的”备份恢复”–> “日志备份”菜单里可以找到binlog 文件， 在这里其实大致就发现了问题，因为出问题的时间段内升成 binlog 的量大大超过其他时间段，然后通过内网下载后就可以对 binlog 进行分析了，这里我们用到了 mysqlbinlog 工具，主要就是找具体是哪些写入导致这个问题，mysqlbinlog 可以在 mysql 官网下载 mysql 的压缩包，注意是压缩包，这样解压了直接用就好了，不用完整安装 mysql，一般我们需要对 binlog 进行 base64 的反编码，<pre class="line-numbers language-bash" data-language=bash><code class=language-bash>./mysqlbinlog <span class="token parameter variable">-vv</span> --base64-output<span class="token operator">=</span>decode-rows mysql-bin.xxxx <span class="token operator">|</span> <span class="token function">less</span><span aria-hidden=true class=line-numbers-rows><span></span></span></code></pre><p>这样查看里面的具体信息，发现是大量的 insert 数据，再经过排查发现同一个 binlog 文件近 500M 全是同一个表的数据插入，再根据表对应的业务查找发现是有个业务逻辑会在这个时间点全量删除后在生成插入数据，后续需要进行优化</div><footer class=post-footer><div class=post-eof></div></footer></article></div><div class=post-block><article class=post-content itemscope itemtype=http://schema.org/Article><link href=https://nicksxs.me/2023/12/17/Tomcat-%E7%B3%BB%E5%88%97%E7%AF%87%E5%8D%81%E4%BA%8C-%E7%95%AA%E5%A4%96%E4%BB%8B%E7%BB%8D%E4%B8%8B-Tomcat-%E7%9A%84%E4%B8%8A%E4%BC%A0%E6%96%87%E4%BB%B6%E9%99%90%E5%88%B6/ itemprop=mainEntityOfPage><span hidden itemprop=author itemscope itemtype=http://schema.org/Person><meta content=/uploads/avatar.jpg itemprop=image><meta content=Nicksxs itemprop=name></span><span hidden itemprop=publisher itemscope itemtype=http://schema.org/Organization><meta content="Nicksxs's Blog" itemprop=name><meta content="learn from zero,技术博客，Nicksxs，史学森" itemprop=description></span><span hidden itemprop=post itemscope itemtype=http://schema.org/CreativeWork><meta content="undefined | Nicksxs's Blog" itemprop=name><meta itemprop=description></span><header class=post-header><h2 itemprop="name headline" class=post-title><a class=post-title-link href=/2023/12/17/Tomcat-%E7%B3%BB%E5%88%97%E7%AF%87%E5%8D%81%E4%BA%8C-%E7%95%AA%E5%A4%96%E4%BB%8B%E7%BB%8D%E4%B8%8B-Tomcat-%E7%9A%84%E4%B8%8A%E4%BC%A0%E6%96%87%E4%BB%B6%E9%99%90%E5%88%B6/ itemprop=url>Tomcat 系列篇十二-番外介绍下 Tomcat 的上传文件限制</a></h2><div class=post-meta-container><div class=post-meta><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-calendar"></i> </span><span class=post-meta-item-text>发表于</span> <time itemprop="dateCreated datePublished" title="创建时间：2023-12-17 19:17:52" datetime=2023-12-17T19:17:52+08:00>2023-12-17</time> </span><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-folder"></i> </span><span class=post-meta-item-text>分类于</span> <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/Java/ itemprop=url rel=index><span itemprop=name>Java</span></a> </span>， <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/Java/SpringBoot/ itemprop=url rel=index><span itemprop=name>SpringBoot</span></a> </span>， <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/Java/SpringBoot/Tomcat/ itemprop=url rel=index><span itemprop=name>Tomcat</span></a> </span></span><span class="post-meta-item leancloud_visitors" data-flag-title="Tomcat 系列篇十二-番外介绍下 Tomcat 的上传文件限制" id=/2023/12/17/Tomcat-%E7%B3%BB%E5%88%97%E7%AF%87%E5%8D%81%E4%BA%8C-%E7%95%AA%E5%A4%96%E4%BB%8B%E7%BB%8D%E4%B8%8B-Tomcat-%E7%9A%84%E4%B8%8A%E4%BC%A0%E6%96%87%E4%BB%B6%E9%99%90%E5%88%B6/ title=阅读次数><span class=post-meta-item-icon><i class="far fa-eye"></i> </span><span class=post-meta-item-text>阅读次数：</span> <span class=leancloud-visitors-count></span> </span><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-comment"></i> </span><span class=post-meta-item-text>Disqus：</span> <a href=/2023/12/17/Tomcat-%E7%B3%BB%E5%88%97%E7%AF%87%E5%8D%81%E4%BA%8C-%E7%95%AA%E5%A4%96%E4%BB%8B%E7%BB%8D%E4%B8%8B-Tomcat-%E7%9A%84%E4%B8%8A%E4%BC%A0%E6%96%87%E4%BB%B6%E9%99%90%E5%88%B6/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2023/12/17/Tomcat-系列篇十二-番外介绍下-Tomcat-的上传文件限制/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><p>最近同学在把 springboot 升级到 2.x 版本的过程中碰到了小问题，可能升级变更里能找到信息，不过我们以学习为目的，可以看看代码是怎么样的<br>报错是在这段代码里的<br><code>org.apache.tomcat.util.http.fileupload.util.LimitedInputStream#checkLimit</code><pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">private</span> <span class="token keyword">void</span> <span class="token function">checkLimit</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>count <span class="token operator">></span> sizeMax<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token function">raiseError</span><span class="token punctuation">(</span>sizeMax<span class="token punctuation">,</span> count<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>其中的 <code>raiseError</code> 是个抽象方法<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">protected</span> <span class="token keyword">abstract</span> <span class="token keyword">void</span> <span class="token function">raiseError</span><span class="token punctuation">(</span><span class="token keyword">long</span> pSizeMax<span class="token punctuation">,</span> <span class="token keyword">long</span> pCount<span class="token punctuation">)</span>
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<span class="token keyword">throws</span> <span class="token class-name">IOException</span><span class="token punctuation">;</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span></span></code></pre><p>具体的实现是在<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">public</span> <span class="token class-name">FileItemStreamImpl</span><span class="token punctuation">(</span><span class="token class-name">FileItemIteratorImpl</span> pFileItemIterator<span class="token punctuation">,</span> <span class="token class-name">String</span> pName<span class="token punctuation">,</span> <span class="token class-name">String</span> pFieldName<span class="token punctuation">,</span> <span class="token class-name">String</span> pContentType<span class="token punctuation">,</span> <span class="token keyword">boolean</span> pFormField<span class="token punctuation">,</span> <span class="token keyword">long</span> pContentLength<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">FileUploadException</span><span class="token punctuation">,</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>fileItemIteratorImpl <span class="token operator">=</span> pFileItemIterator<span class="token punctuation">;</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>name <span class="token operator">=</span> pName<span class="token punctuation">;</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>fieldName <span class="token operator">=</span> pFieldName<span class="token punctuation">;</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>contentType <span class="token operator">=</span> pContentType<span class="token punctuation">;</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>formField <span class="token operator">=</span> pFormField<span class="token punctuation">;</span>
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<span class="token keyword">long</span> fileSizeMax <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>fileItemIteratorImpl<span class="token punctuation">.</span><span class="token function">getFileSizeMax</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>fileSizeMax <span class="token operator">!=</span> <span class="token operator">-</span><span class="token number">1L</span> <span class="token operator">&&</span> pContentLength <span class="token operator">!=</span> <span class="token operator">-</span><span class="token number">1L</span> <span class="token operator">&&</span> pContentLength <span class="token operator">></span> fileSizeMax<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token class-name">FileSizeLimitExceededException</span> e <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">FileSizeLimitExceededException</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">.</span><span class="token function">format</span><span class="token punctuation">(</span><span class="token string">"The field %s exceeds its maximum permitted size of %s bytes."</span><span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span>fieldName<span class="token punctuation">,</span> fileSizeMax<span class="token punctuation">)</span><span class="token punctuation">,</span> pContentLength<span class="token punctuation">,</span> fileSizeMax<span class="token punctuation">)</span><span class="token punctuation">;</span>
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e<span class="token punctuation">.</span><span class="token function">setFileName</span><span class="token punctuation">(</span>pName<span class="token punctuation">)</span><span class="token punctuation">;</span>
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e<span class="token punctuation">.</span><span class="token function">setFieldName</span><span class="token punctuation">(</span>pFieldName<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">FileUploadIOException</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
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<span class="token keyword">final</span> <span class="token class-name">MultipartStream<span class="token punctuation">.</span>ItemInputStream</span> itemStream <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>fileItemIteratorImpl<span class="token punctuation">.</span><span class="token function">getMultiPartStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">newInputStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">InputStream</span> istream <span class="token operator">=</span> itemStream<span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>fileSizeMax <span class="token operator">!=</span> <span class="token operator">-</span><span class="token number">1L</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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istream <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">LimitedInputStream</span><span class="token punctuation">(</span>itemStream<span class="token punctuation">,</span> fileSizeMax<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">protected</span> <span class="token keyword">void</span> <span class="token function">raiseError</span><span class="token punctuation">(</span><span class="token keyword">long</span> pSizeMax<span class="token punctuation">,</span> <span class="token keyword">long</span> pCount<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>
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itemStream<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token boolean">true</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">FileSizeLimitExceededException</span> e <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">FileSizeLimitExceededException</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">.</span><span class="token function">format</span><span class="token punctuation">(</span><span class="token string">"The field %s exceeds its maximum permitted size of %s bytes."</span><span class="token punctuation">,</span> <span class="token class-name">FileItemStreamImpl</span><span class="token punctuation">.</span><span class="token keyword">this</span><span class="token punctuation">.</span>fieldName<span class="token punctuation">,</span> pSizeMax<span class="token punctuation">)</span><span class="token punctuation">,</span> pCount<span class="token punctuation">,</span> pSizeMax<span class="token punctuation">)</span><span class="token punctuation">;</span>
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e<span class="token punctuation">.</span><span class="token function">setFieldName</span><span class="token punctuation">(</span><span class="token class-name">FileItemStreamImpl</span><span class="token punctuation">.</span><span class="token keyword">this</span><span class="token punctuation">.</span>fieldName<span class="token punctuation">)</span><span class="token punctuation">;</span>
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e<span class="token punctuation">.</span><span class="token function">setFileName</span><span class="token punctuation">(</span><span class="token class-name">FileItemStreamImpl</span><span class="token punctuation">.</span><span class="token keyword">this</span><span class="token punctuation">.</span>name<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">FileUploadIOException</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>stream <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token class-name">InputStream</span><span class="token punctuation">)</span>istream<span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>后面也会介绍到，这里我们其实主要是要找到这个 pSizeMax 是哪里来的<br>通过阅读代码会发现跟这个类 <code>MultipartConfigElement</code> 有关系<br>而在升级后的 springboot 中这个类已经有了自动装配类，也就是<br><code>org.springframework.boot.autoconfigure.web.servlet.MultipartAutoConfiguration</code><p>有了这个自动装配<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token annotation punctuation">@Configuration</span><span class="token punctuation">(</span>
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proxyBeanMethods <span class="token operator">=</span> <span class="token boolean">false</span>
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<span class="token punctuation">)</span>
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<span class="token annotation punctuation">@ConditionalOnClass</span><span class="token punctuation">(</span><span class="token punctuation">{</span><span class="token class-name">Servlet</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">,</span> <span class="token class-name">StandardServletMultipartResolver</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">,</span> <span class="token class-name">MultipartConfigElement</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
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<span class="token annotation punctuation">@ConditionalOnProperty</span><span class="token punctuation">(</span>
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prefix <span class="token operator">=</span> <span class="token string">"spring.servlet.multipart"</span><span class="token punctuation">,</span>
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name <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token string">"enabled"</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
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matchIfMissing <span class="token operator">=</span> <span class="token boolean">true</span>
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<span class="token punctuation">)</span>
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<span class="token annotation punctuation">@ConditionalOnWebApplication</span><span class="token punctuation">(</span>
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type <span class="token operator">=</span> <span class="token class-name">Type</span><span class="token punctuation">.</span><span class="token constant">SERVLET</span>
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<span class="token punctuation">)</span>
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<span class="token annotation punctuation">@EnableConfigurationProperties</span><span class="token punctuation">(</span><span class="token punctuation">{</span><span class="token class-name">MultipartProperties</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
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<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">MultipartAutoConfiguration</span> <span class="token punctuation">{</span>
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<span class="token keyword">private</span> <span class="token keyword">final</span> <span class="token class-name">MultipartProperties</span> multipartProperties<span class="token punctuation">;</span>
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<span class="token keyword">public</span> <span class="token class-name">MultipartAutoConfiguration</span><span class="token punctuation">(</span><span class="token class-name">MultipartProperties</span> multipartProperties<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>multipartProperties <span class="token operator">=</span> multipartProperties<span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token annotation punctuation">@Bean</span>
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<span class="token annotation punctuation">@ConditionalOnMissingBean</span><span class="token punctuation">(</span><span class="token punctuation">{</span><span class="token class-name">MultipartConfigElement</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">,</span> <span class="token class-name">CommonsMultipartResolver</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
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<span class="token keyword">public</span> <span class="token class-name">MultipartConfigElement</span> <span class="token function">multipartConfigElement</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> <span class="token keyword">this</span><span class="token punctuation">.</span>multipartProperties<span class="token punctuation">.</span><span class="token function">createMultipartConfig</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>而这个 MultipartProperties 类中<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token annotation punctuation">@ConfigurationProperties</span><span class="token punctuation">(</span>
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prefix <span class="token operator">=</span> <span class="token string">"spring.servlet.multipart"</span><span class="token punctuation">,</span>
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ignoreUnknownFields <span class="token operator">=</span> <span class="token boolean">false</span>
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<span class="token punctuation">)</span>
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<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">MultipartProperties</span> <span class="token punctuation">{</span>
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<span class="token keyword">private</span> <span class="token keyword">boolean</span> enabled <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
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<span class="token keyword">private</span> <span class="token class-name">String</span> location<span class="token punctuation">;</span>
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<span class="token keyword">private</span> <span class="token class-name">DataSize</span> maxFileSize <span class="token operator">=</span> <span class="token class-name">DataSize</span><span class="token punctuation">.</span><span class="token function">ofMegabytes</span><span class="token punctuation">(</span><span class="token number">1L</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">private</span> <span class="token class-name">DataSize</span> maxRequestSize <span class="token operator">=</span> <span class="token class-name">DataSize</span><span class="token punctuation">.</span><span class="token function">ofMegabytes</span><span class="token punctuation">(</span><span class="token number">10L</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">private</span> <span class="token class-name">DataSize</span> fileSizeThreshold <span class="token operator">=</span> <span class="token class-name">DataSize</span><span class="token punctuation">.</span><span class="token function">ofBytes</span><span class="token punctuation">(</span><span class="token number">0L</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">private</span> <span class="token keyword">boolean</span> resolveLazily <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>并且在前面 createMultipartConfig 中就使用了这个maxFileSize 的默认值<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">public</span> <span class="token class-name">MultipartConfigElement</span> <span class="token function">createMultipartConfig</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token class-name">MultipartConfigFactory</span> factory <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">MultipartConfigFactory</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">PropertyMapper</span> map <span class="token operator">=</span> <span class="token class-name">PropertyMapper</span><span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">alwaysApplyingWhenNonNull</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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map<span class="token punctuation">.</span><span class="token function">from</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>fileSizeThreshold<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token keyword">to</span><span class="token punctuation">(</span>factory<span class="token operator">::</span><span class="token function">setFileSizeThreshold</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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map<span class="token punctuation">.</span><span class="token function">from</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>location<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">whenHasText</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token keyword">to</span><span class="token punctuation">(</span>factory<span class="token operator">::</span><span class="token function">setLocation</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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map<span class="token punctuation">.</span><span class="token function">from</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>maxRequestSize<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token keyword">to</span><span class="token punctuation">(</span>factory<span class="token operator">::</span><span class="token function">setMaxRequestSize</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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map<span class="token punctuation">.</span><span class="token function">from</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>maxFileSize<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token keyword">to</span><span class="token punctuation">(</span>factory<span class="token operator">::</span><span class="token function">setMaxFileSize</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">return</span> factory<span class="token punctuation">.</span><span class="token function">createMultipartConfig</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>而在 <code>org.apache.catalina.connector.Request#parseParts</code> 中，会判断 mce 的配置<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">private</span> <span class="token keyword">void</span> <span class="token function">parseParts</span><span class="token punctuation">(</span><span class="token keyword">boolean</span> explicit<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">// 省略一部分代码</span>
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<span class="token class-name">ServletFileUpload</span> upload <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ServletFileUpload</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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upload<span class="token punctuation">.</span><span class="token function">setFileItemFactory</span><span class="token punctuation">(</span>factory<span class="token punctuation">)</span><span class="token punctuation">;</span>
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upload<span class="token punctuation">.</span><span class="token function">setFileSizeMax</span><span class="token punctuation">(</span>mce<span class="token punctuation">.</span><span class="token function">getMaxFileSize</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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upload<span class="token punctuation">.</span><span class="token function">setSizeMax</span><span class="token punctuation">(</span>mce<span class="token punctuation">.</span><span class="token function">getMaxRequestSize</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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parts <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ArrayList</span><span class="token generics"><span class="token punctuation"><</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">FileItem</span><span class="token punctuation">></span></span> items <span class="token operator">=</span>
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upload<span class="token punctuation">.</span><span class="token function">parseRequest</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">ServletRequestContext</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">int</span> maxPostSize <span class="token operator">=</span> <span class="token function">getConnector</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getMaxPostSize</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">int</span> postSize <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
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<span class="token class-name">Charset</span> charset <span class="token operator">=</span> <span class="token function">getCharset</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>主要 org.apache.tomcat.util.http.fileupload.FileUploadBase#parseRequest<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">public</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">FileItem</span><span class="token punctuation">></span></span> <span class="token function">parseRequest</span><span class="token punctuation">(</span><span class="token keyword">final</span> <span class="token class-name">RequestContext</span> ctx<span class="token punctuation">)</span>
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<span class="token keyword">throws</span> <span class="token class-name">FileUploadException</span> <span class="token punctuation">{</span>
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<span class="token keyword">final</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">FileItem</span><span class="token punctuation">></span></span> items <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ArrayList</span><span class="token generics"><span class="token punctuation"><</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">boolean</span> successful <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<span class="token keyword">final</span> <span class="token class-name">FileItemIterator</span> iter <span class="token operator">=</span> <span class="token function">getItemIterator</span><span class="token punctuation">(</span>ctx<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">final</span> <span class="token class-name">FileItemFactory</span> fileItemFactory <span class="token operator">=</span> <span class="token class-name">Objects</span><span class="token punctuation">.</span><span class="token function">requireNonNull</span><span class="token punctuation">(</span><span class="token function">getFileItemFactory</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
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<span class="token string">"No FileItemFactory has been set."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">final</span> <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token punctuation">]</span> buffer <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token class-name">Streams</span><span class="token punctuation">.</span><span class="token constant">DEFAULT_BUFFER_SIZE</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
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<span class="token keyword">while</span> <span class="token punctuation">(</span>iter<span class="token punctuation">.</span><span class="token function">hasNext</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">final</span> <span class="token class-name">FileItemStream</span> item <span class="token operator">=</span> iter<span class="token punctuation">.</span><span class="token function">next</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token comment">// Don't use getName() here to prevent an InvalidFileNameException.</span>
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<span class="token keyword">final</span> <span class="token class-name">String</span> fileName <span class="token operator">=</span> item<span class="token punctuation">.</span><span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">final</span> <span class="token class-name">FileItem</span> fileItem <span class="token operator">=</span> fileItemFactory<span class="token punctuation">.</span><span class="token function">createItem</span><span class="token punctuation">(</span>item<span class="token punctuation">.</span><span class="token function">getFieldName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> item<span class="token punctuation">.</span><span class="token function">getContentType</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
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item<span class="token punctuation">.</span><span class="token function">isFormField</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> fileName<span class="token punctuation">)</span><span class="token punctuation">;</span>
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items<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>fileItem<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<span class="token class-name">Streams</span><span class="token punctuation">.</span><span class="token function">copy</span><span class="token punctuation">(</span>item<span class="token punctuation">.</span><span class="token function">openStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> fileItem<span class="token punctuation">.</span><span class="token function">getOutputStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token boolean">true</span><span class="token punctuation">,</span> buffer<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token keyword">final</span> <span class="token class-name">FileUploadIOException</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>其中 org.apache.tomcat.util.http.fileupload.FileUploadBase#getItemIterator<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">public</span> <span class="token class-name">FileItemIterator</span> <span class="token function">getItemIterator</span><span class="token punctuation">(</span><span class="token keyword">final</span> <span class="token class-name">RequestContext</span> ctx<span class="token punctuation">)</span>
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<span class="token keyword">throws</span> <span class="token class-name">FileUploadException</span><span class="token punctuation">,</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">FileItemIteratorImpl</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> ctx<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token keyword">final</span> <span class="token class-name">FileUploadIOException</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">// unwrap encapsulated SizeException</span>
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<span class="token keyword">throw</span> <span class="token punctuation">(</span><span class="token class-name">FileUploadException</span><span class="token punctuation">)</span> e<span class="token punctuation">.</span><span class="token function">getCause</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>这里就创建了 org.apache.tomcat.util.http.fileupload.impl.FileItemIteratorImpl<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">public</span> <span class="token class-name">FileItemIteratorImpl</span><span class="token punctuation">(</span><span class="token keyword">final</span> <span class="token class-name">FileUploadBase</span> fileUploadBase<span class="token punctuation">,</span> <span class="token keyword">final</span> <span class="token class-name">RequestContext</span> requestContext<span class="token punctuation">)</span>
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<span class="token keyword">throws</span> <span class="token class-name">FileUploadException</span><span class="token punctuation">,</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>fileUploadBase <span class="token operator">=</span> fileUploadBase<span class="token punctuation">;</span>
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sizeMax <span class="token operator">=</span> fileUploadBase<span class="token punctuation">.</span><span class="token function">getSizeMax</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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fileSizeMax <span class="token operator">=</span> fileUploadBase<span class="token punctuation">.</span><span class="token function">getFileSizeMax</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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ctx <span class="token operator">=</span> <span class="token class-name">Objects</span><span class="token punctuation">.</span><span class="token function">requireNonNull</span><span class="token punctuation">(</span>requestContext<span class="token punctuation">,</span> <span class="token string">"requestContext"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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skipPreamble <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
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<span class="token function">findNextItem</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>内部使用了前面给 upload 设置的文件大小上限 upload.setFileSizeMax(mce.getMaxFileSize());<p>然后在 findNextItem 里执行了初始化<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">private</span> <span class="token keyword">boolean</span> <span class="token function">findNextItem</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">FileUploadException</span><span class="token punctuation">,</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>eof<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>currentItem <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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currentItem<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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currentItem <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">final</span> <span class="token class-name">MultipartStream</span> multi <span class="token operator">=</span> <span class="token function">getMultiPartStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token punctuation">;</span><span class="token punctuation">;</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">final</span> <span class="token keyword">boolean</span> nextPart<span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>skipPreamble<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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nextPart <span class="token operator">=</span> multi<span class="token punctuation">.</span><span class="token function">skipPreamble</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
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nextPart <span class="token operator">=</span> multi<span class="token punctuation">.</span><span class="token function">readBoundary</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>nextPart<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>currentFieldName <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">// Outer multipart terminated -> No more data</span>
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eof <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
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<span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token comment">// Inner multipart terminated -> Return to parsing the outer</span>
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multi<span class="token punctuation">.</span><span class="token function">setBoundary</span><span class="token punctuation">(</span>multiPartBoundary<span class="token punctuation">)</span><span class="token punctuation">;</span>
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currentFieldName <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
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<span class="token keyword">continue</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">final</span> <span class="token class-name">FileItemHeaders</span> headers <span class="token operator">=</span> fileUploadBase<span class="token punctuation">.</span><span class="token function">getParsedHeaders</span><span class="token punctuation">(</span>multi<span class="token punctuation">.</span><span class="token function">readHeaders</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>currentFieldName <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">// We're parsing the outer multipart</span>
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<span class="token keyword">final</span> <span class="token class-name">String</span> fieldName <span class="token operator">=</span> fileUploadBase<span class="token punctuation">.</span><span class="token function">getFieldName</span><span class="token punctuation">(</span>headers<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>fieldName <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">final</span> <span class="token class-name">String</span> subContentType <span class="token operator">=</span> headers<span class="token punctuation">.</span><span class="token function">getHeader</span><span class="token punctuation">(</span><span class="token class-name">FileUploadBase</span><span class="token punctuation">.</span><span class="token constant">CONTENT_TYPE</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>subContentType <span class="token operator">!=</span> <span class="token keyword">null</span>
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<span class="token operator">&&</span> subContentType<span class="token punctuation">.</span><span class="token function">toLowerCase</span><span class="token punctuation">(</span><span class="token class-name">Locale</span><span class="token punctuation">.</span><span class="token constant">ENGLISH</span><span class="token punctuation">)</span>
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<span class="token punctuation">.</span><span class="token function">startsWith</span><span class="token punctuation">(</span><span class="token class-name">FileUploadBase</span><span class="token punctuation">.</span><span class="token constant">MULTIPART_MIXED</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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currentFieldName <span class="token operator">=</span> fieldName<span class="token punctuation">;</span>
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<span class="token comment">// Multiple files associated with this field name</span>
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<span class="token keyword">final</span> <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token punctuation">]</span> subBoundary <span class="token operator">=</span> fileUploadBase<span class="token punctuation">.</span><span class="token function">getBoundary</span><span class="token punctuation">(</span>subContentType<span class="token punctuation">)</span><span class="token punctuation">;</span>
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multi<span class="token punctuation">.</span><span class="token function">setBoundary</span><span class="token punctuation">(</span>subBoundary<span class="token punctuation">)</span><span class="token punctuation">;</span>
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skipPreamble <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
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<span class="token keyword">continue</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">final</span> <span class="token class-name">String</span> fileName <span class="token operator">=</span> fileUploadBase<span class="token punctuation">.</span><span class="token function">getFileName</span><span class="token punctuation">(</span>headers<span class="token punctuation">)</span><span class="token punctuation">;</span>
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currentItem <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">FileItemStreamImpl</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> fileName<span class="token punctuation">,</span>
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fieldName<span class="token punctuation">,</span> headers<span class="token punctuation">.</span><span class="token function">getHeader</span><span class="token punctuation">(</span><span class="token class-name">FileUploadBase</span><span class="token punctuation">.</span><span class="token constant">CONTENT_TYPE</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
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fileName <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token function">getContentLength</span><span class="token punctuation">(</span>headers<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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currentItem<span class="token punctuation">.</span><span class="token function">setHeaders</span><span class="token punctuation">(</span>headers<span class="token punctuation">)</span><span class="token punctuation">;</span>
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progressNotifier<span class="token punctuation">.</span><span class="token function">noteItem</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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itemValid <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
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<span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
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<span class="token keyword">final</span> <span class="token class-name">String</span> fileName <span class="token operator">=</span> fileUploadBase<span class="token punctuation">.</span><span class="token function">getFileName</span><span class="token punctuation">(</span>headers<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>fileName <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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currentItem <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">FileItemStreamImpl</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> fileName<span class="token punctuation">,</span>
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currentFieldName<span class="token punctuation">,</span>
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headers<span class="token punctuation">.</span><span class="token function">getHeader</span><span class="token punctuation">(</span><span class="token class-name">FileUploadBase</span><span class="token punctuation">.</span><span class="token constant">CONTENT_TYPE</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
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<span class="token boolean">false</span><span class="token punctuation">,</span> <span class="token function">getContentLength</span><span class="token punctuation">(</span>headers<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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currentItem<span class="token punctuation">.</span><span class="token function">setHeaders</span><span class="token punctuation">(</span>headers<span class="token punctuation">)</span><span class="token punctuation">;</span>
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progressNotifier<span class="token punctuation">.</span><span class="token function">noteItem</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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itemValid <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
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<span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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multi<span class="token punctuation">.</span><span class="token function">discardBodyData</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>这里面就会 new 这个 FileItemStreamImpl<pre class="line-numbers language-java" data-language=java><code class=language-java>currentItem <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">FileItemStreamImpl</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> fileName<span class="token punctuation">,</span>
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fieldName<span class="token punctuation">,</span> headers<span class="token punctuation">.</span><span class="token function">getHeader</span><span class="token punctuation">(</span><span class="token class-name">FileUploadBase</span><span class="token punctuation">.</span><span class="token constant">CONTENT_TYPE</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
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fileName <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token function">getContentLength</span><span class="token punctuation">(</span>headers<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span></span></code></pre><p>构造方法比较长<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">public</span> <span class="token class-name">FileItemStreamImpl</span><span class="token punctuation">(</span><span class="token keyword">final</span> <span class="token class-name">FileItemIteratorImpl</span> pFileItemIterator<span class="token punctuation">,</span> <span class="token keyword">final</span> <span class="token class-name">String</span> pName<span class="token punctuation">,</span> <span class="token keyword">final</span> <span class="token class-name">String</span> pFieldName<span class="token punctuation">,</span>
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<span class="token keyword">final</span> <span class="token class-name">String</span> pContentType<span class="token punctuation">,</span> <span class="token keyword">final</span> <span class="token keyword">boolean</span> pFormField<span class="token punctuation">,</span>
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|
<span class="token keyword">final</span> <span class="token keyword">long</span> pContentLength<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">FileUploadException</span><span class="token punctuation">,</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>
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|
fileItemIteratorImpl <span class="token operator">=</span> pFileItemIterator<span class="token punctuation">;</span>
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name <span class="token operator">=</span> pName<span class="token punctuation">;</span>
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fieldName <span class="token operator">=</span> pFieldName<span class="token punctuation">;</span>
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contentType <span class="token operator">=</span> pContentType<span class="token punctuation">;</span>
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formField <span class="token operator">=</span> pFormField<span class="token punctuation">;</span>
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<span class="token keyword">final</span> <span class="token keyword">long</span> fileSizeMax <span class="token operator">=</span> fileItemIteratorImpl<span class="token punctuation">.</span><span class="token function">getFileSizeMax</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>fileSizeMax <span class="token operator">!=</span> <span class="token operator">-</span><span class="token number">1</span> <span class="token operator">&&</span> pContentLength <span class="token operator">!=</span> <span class="token operator">-</span><span class="token number">1</span>
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<span class="token operator">&&</span> pContentLength <span class="token operator">></span> fileSizeMax<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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|
<span class="token keyword">final</span> <span class="token class-name">FileSizeLimitExceededException</span> e <span class="token operator">=</span>
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<span class="token keyword">new</span> <span class="token class-name">FileSizeLimitExceededException</span><span class="token punctuation">(</span>
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<span class="token class-name">String</span><span class="token punctuation">.</span><span class="token function">format</span><span class="token punctuation">(</span><span class="token string">"The field %s exceeds its maximum permitted size of %s bytes."</span><span class="token punctuation">,</span>
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fieldName<span class="token punctuation">,</span> <span class="token class-name">Long</span><span class="token punctuation">.</span><span class="token function">valueOf</span><span class="token punctuation">(</span>fileSizeMax<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
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|
pContentLength<span class="token punctuation">,</span> fileSizeMax<span class="token punctuation">)</span><span class="token punctuation">;</span>
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e<span class="token punctuation">.</span><span class="token function">setFileName</span><span class="token punctuation">(</span>pName<span class="token punctuation">)</span><span class="token punctuation">;</span>
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e<span class="token punctuation">.</span><span class="token function">setFieldName</span><span class="token punctuation">(</span>pFieldName<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">FileUploadIOException</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token comment">// OK to construct stream now</span>
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<span class="token keyword">final</span> <span class="token class-name">ItemInputStream</span> itemStream <span class="token operator">=</span> fileItemIteratorImpl<span class="token punctuation">.</span><span class="token function">getMultiPartStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">newInputStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token class-name">InputStream</span> istream <span class="token operator">=</span> itemStream<span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>fileSizeMax <span class="token operator">!=</span> <span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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istream <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">LimitedInputStream</span><span class="token punctuation">(</span>istream<span class="token punctuation">,</span> fileSizeMax<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token annotation punctuation">@Override</span>
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<span class="token keyword">protected</span> <span class="token keyword">void</span> <span class="token function">raiseError</span><span class="token punctuation">(</span><span class="token keyword">final</span> <span class="token keyword">long</span> pSizeMax<span class="token punctuation">,</span> <span class="token keyword">final</span> <span class="token keyword">long</span> pCount<span class="token punctuation">)</span>
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|
<span class="token keyword">throws</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>
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|
itemStream<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token boolean">true</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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|
<span class="token keyword">final</span> <span class="token class-name">FileSizeLimitExceededException</span> e <span class="token operator">=</span>
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|
<span class="token keyword">new</span> <span class="token class-name">FileSizeLimitExceededException</span><span class="token punctuation">(</span>
|
|
<span class="token class-name">String</span><span class="token punctuation">.</span><span class="token function">format</span><span class="token punctuation">(</span><span class="token string">"The field %s exceeds its maximum permitted size of %s bytes."</span><span class="token punctuation">,</span>
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|
fieldName<span class="token punctuation">,</span> <span class="token class-name">Long</span><span class="token punctuation">.</span><span class="token function">valueOf</span><span class="token punctuation">(</span>pSizeMax<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
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|
pCount<span class="token punctuation">,</span> pSizeMax<span class="token punctuation">)</span><span class="token punctuation">;</span>
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|
e<span class="token punctuation">.</span><span class="token function">setFieldName</span><span class="token punctuation">(</span>fieldName<span class="token punctuation">)</span><span class="token punctuation">;</span>
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|
e<span class="token punctuation">.</span><span class="token function">setFileName</span><span class="token punctuation">(</span>name<span class="token punctuation">)</span><span class="token punctuation">;</span>
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|
<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">FileUploadIOException</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span><span class="token punctuation">;</span>
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|
<span class="token punctuation">}</span>
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|
<span class="token punctuation">}</span><span class="token punctuation">;</span>
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|
<span class="token punctuation">}</span>
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stream <span class="token operator">=</span> istream<span class="token punctuation">;</span>
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|
<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>当 <code>fileSizeMax != 0</code> 的时候就会初始化 LimitedInputStream，这就就是会在前面的<p><code>org.apache.tomcat.util.http.fileupload.FileUploadBase#parseRequest</code> 中<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token class-name">Streams</span><span class="token punctuation">.</span><span class="token function">copy</span><span class="token punctuation">(</span>item<span class="token punctuation">.</span><span class="token function">openStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> fileItem<span class="token punctuation">.</span><span class="token function">getOutputStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token boolean">true</span><span class="token punctuation">,</span> buffer<span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden=true class=line-numbers-rows><span></span></span></code></pre><p>这里的 item<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">final</span> <span class="token class-name">FileItemIterator</span> iter <span class="token operator">=</span> <span class="token function">getItemIterator</span><span class="token punctuation">(</span>ctx<span class="token punctuation">)</span><span class="token punctuation">;</span>
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|
<span class="token keyword">final</span> <span class="token class-name">FileItemFactory</span> fileItemFactory <span class="token operator">=</span> <span class="token class-name">Objects</span><span class="token punctuation">.</span><span class="token function">requireNonNull</span><span class="token punctuation">(</span><span class="token function">getFileItemFactory</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
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|
<span class="token string">"No FileItemFactory has been set."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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|
<span class="token keyword">final</span> <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token punctuation">]</span> buffer <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token class-name">Streams</span><span class="token punctuation">.</span><span class="token constant">DEFAULT_BUFFER_SIZE</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
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|
<span class="token keyword">while</span> <span class="token punctuation">(</span>iter<span class="token punctuation">.</span><span class="token function">hasNext</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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|
<span class="token keyword">final</span> <span class="token class-name">FileItemStream</span> item <span class="token operator">=</span> iter<span class="token punctuation">.</span><span class="token function">next</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>调用了 FileItemIterator 迭代器的 next<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token annotation punctuation">@Override</span>
|
|
<span class="token keyword">public</span> <span class="token class-name">FileItemStream</span> <span class="token function">next</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">FileUploadException</span><span class="token punctuation">,</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>
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|
<span class="token keyword">if</span> <span class="token punctuation">(</span>eof <span class="token operator">||</span> <span class="token punctuation">(</span><span class="token operator">!</span>itemValid <span class="token operator">&&</span> <span class="token operator">!</span><span class="token function">hasNext</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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|
<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">NoSuchElementException</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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|
<span class="token punctuation">}</span>
|
|
itemValid <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
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|
<span class="token keyword">return</span> currentItem<span class="token punctuation">;</span>
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|
<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>这个 <code>currentItem</code> 就是前面 new 的 FileItemStreamImpl<p>然后在 Streams.copy 的时候调用 openStream 也就是 <code>org.apache.tomcat.util.http.fileupload.impl.FileItemStreamImpl#openStream</code><pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token annotation punctuation">@Override</span>
|
|
<span class="token keyword">public</span> <span class="token class-name">InputStream</span> <span class="token function">openStream</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>
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|
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token class-name">Closeable</span><span class="token punctuation">)</span> stream<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">isClosed</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">FileItemStream<span class="token punctuation">.</span>ItemSkippedException</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token keyword">return</span> stream<span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>这里的 stream 就是 FileItemStreamImpl 构造方法最后赋值的 stream，会在大小超过限制时抛出错误<p>而这个可以通过设置 properties 来修改，spring.servlet.multipart.max-file-size 和 spring.servlet.multipart.max-request-size<pre class="line-numbers language-java" data-language=java><code class=language-java>spring<span class="token punctuation">.</span>servlet<span class="token punctuation">.</span>multipart<span class="token punctuation">.</span>max<span class="token operator">-</span>file<span class="token operator">-</span>size<span class="token operator">=</span><span class="token number">100</span><span class="token constant">MB</span>
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spring<span class="token punctuation">.</span>servlet<span class="token punctuation">.</span>multipart<span class="token punctuation">.</span>max<span class="token operator">-</span>request<span class="token operator">-</span>size<span class="token operator">=</span><span class="token number">100</span><span class="token constant">MB</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span></span></code></pre><p>而老版本的 <code>spring.http.multipart.maxFileSize</code><br>其实就是配置名称改了下，但是能看一下代码也是有点收获的。</div><footer class=post-footer><div class=post-eof></div></footer></article></div><div class=post-block><article class=post-content itemscope itemtype=http://schema.org/Article><link href=https://nicksxs.me/2023/12/10/Tomcat-%E7%B3%BB%E5%88%97%E7%AF%87%E5%8D%81%E4%B8%80-%E4%BB%8B%E7%BB%8D%E4%B8%8B-Tomcat-%E9%87%8C%E7%9A%84%E5%90%8E%E5%8F%B0%E5%A4%84%E7%90%86%E5%92%8C%E7%83%AD%E5%8A%A0%E8%BD%BD/ itemprop=mainEntityOfPage><span hidden itemprop=author itemscope itemtype=http://schema.org/Person><meta content=/uploads/avatar.jpg itemprop=image><meta content=Nicksxs itemprop=name></span><span hidden itemprop=publisher itemscope itemtype=http://schema.org/Organization><meta content="Nicksxs's Blog" itemprop=name><meta content="learn from zero,技术博客，Nicksxs，史学森" itemprop=description></span><span hidden itemprop=post itemscope itemtype=http://schema.org/CreativeWork><meta content="undefined | Nicksxs's Blog" itemprop=name><meta itemprop=description></span><header class=post-header><h2 itemprop="name headline" class=post-title><a class=post-title-link href=/2023/12/10/Tomcat-%E7%B3%BB%E5%88%97%E7%AF%87%E5%8D%81%E4%B8%80-%E4%BB%8B%E7%BB%8D%E4%B8%8B-Tomcat-%E9%87%8C%E7%9A%84%E5%90%8E%E5%8F%B0%E5%A4%84%E7%90%86%E5%92%8C%E7%83%AD%E5%8A%A0%E8%BD%BD/ itemprop=url>Tomcat 系列篇十一-介绍下 Tomcat 里的后台处理和热加载</a></h2><div class=post-meta-container><div class=post-meta><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-calendar"></i> </span><span class=post-meta-item-text>发表于</span> <time itemprop="dateCreated datePublished" title="创建时间：2023-12-10 20:28:28" datetime=2023-12-10T20:28:28+08:00>2023-12-10</time> </span><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-folder"></i> </span><span class=post-meta-item-text>分类于</span> <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/Java/ itemprop=url rel=index><span itemprop=name>Java</span></a> </span>， <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/Java/SpringBoot/ itemprop=url rel=index><span itemprop=name>SpringBoot</span></a> </span>， <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/Java/SpringBoot/Tomcat/ itemprop=url rel=index><span itemprop=name>Tomcat</span></a> </span></span><span class="post-meta-item leancloud_visitors" data-flag-title="Tomcat 系列篇十一-介绍下 Tomcat 里的后台处理和热加载" id=/2023/12/10/Tomcat-%E7%B3%BB%E5%88%97%E7%AF%87%E5%8D%81%E4%B8%80-%E4%BB%8B%E7%BB%8D%E4%B8%8B-Tomcat-%E9%87%8C%E7%9A%84%E5%90%8E%E5%8F%B0%E5%A4%84%E7%90%86%E5%92%8C%E7%83%AD%E5%8A%A0%E8%BD%BD/ title=阅读次数><span class=post-meta-item-icon><i class="far fa-eye"></i> </span><span class=post-meta-item-text>阅读次数：</span> <span class=leancloud-visitors-count></span> </span><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-comment"></i> </span><span class=post-meta-item-text>Disqus：</span> <a href=/2023/12/10/Tomcat-%E7%B3%BB%E5%88%97%E7%AF%87%E5%8D%81%E4%B8%80-%E4%BB%8B%E7%BB%8D%E4%B8%8B-Tomcat-%E9%87%8C%E7%9A%84%E5%90%8E%E5%8F%B0%E5%A4%84%E7%90%86%E5%92%8C%E7%83%AD%E5%8A%A0%E8%BD%BD/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2023/12/10/Tomcat-系列篇十一-介绍下-Tomcat-里的后台处理和热加载/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><p>这部分其实之前在讲线程池的时候也有点带到了， 主要是在这个类里<br><code>org.apache.catalina.core.ContainerBase.ContainerBackgroundProcessor</code><pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">protected</span> <span class="token keyword">class</span> <span class="token class-name">ContainerBackgroundProcessor</span> <span class="token keyword">implements</span> <span class="token class-name">Runnable</span> <span class="token punctuation">{</span>
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|
<span class="token annotation punctuation">@Override</span>
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<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">run</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token function">processChildren</span><span class="token punctuation">(</span><span class="token class-name">ContainerBase</span><span class="token punctuation">.</span><span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">protected</span> <span class="token keyword">void</span> <span class="token function">processChildren</span><span class="token punctuation">(</span><span class="token class-name">Container</span> container<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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|
<span class="token class-name">ClassLoader</span> originalClassLoader <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>container <span class="token keyword">instanceof</span> <span class="token class-name">Context</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token class-name">Loader</span> loader <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token class-name">Context</span><span class="token punctuation">)</span> container<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getLoader</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token comment">// Loader will be null for FailedContext instances</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>loader <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token comment">// Ensure background processing for Contexts and Wrappers</span>
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|
<span class="token comment">// is performed under the web app's class loader</span>
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|
originalClassLoader <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token class-name">Context</span><span class="token punctuation">)</span> container<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">bind</span><span class="token punctuation">(</span><span class="token boolean">false</span><span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token comment">// 调用 Container 的 backgroundProcess</span>
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|
container<span class="token punctuation">.</span><span class="token function">backgroundProcess</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token comment">// 然后寻找 children</span>
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<span class="token class-name">Container</span><span class="token punctuation">[</span><span class="token punctuation">]</span> children <span class="token operator">=</span> container<span class="token punctuation">.</span><span class="token function">findChildren</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token class-name">Container</span> child <span class="token operator">:</span> children<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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|
<span class="token comment">// 如果 backgroundProcessorDelay <= 0 就调用执行</span>
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<span class="token comment">// 否则代表这个 Container 有之前第八篇说的 StartChild 这种</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>child<span class="token punctuation">.</span><span class="token function">getBackgroundProcessorDelay</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator"><=</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token function">processChildren</span><span class="token punctuation">(</span>child<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Throwable</span> t<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token class-name">ExceptionUtils</span><span class="token punctuation">.</span><span class="token function">handleThrowable</span><span class="token punctuation">(</span>t<span class="token punctuation">)</span><span class="token punctuation">;</span>
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log<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span>sm<span class="token punctuation">.</span><span class="token function">getString</span><span class="token punctuation">(</span><span class="token string">"containerBase.backgroundProcess.error"</span><span class="token punctuation">)</span><span class="token punctuation">,</span> t<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>container <span class="token keyword">instanceof</span> <span class="token class-name">Context</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token class-name">Context</span><span class="token punctuation">)</span> container<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">unbind</span><span class="token punctuation">(</span><span class="token boolean">false</span><span class="token punctuation">,</span> originalClassLoader<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>这个触发方式是在 ContainerBase 里的<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">protected</span> <span class="token keyword">class</span> <span class="token class-name">ContainerBackgroundProcessorMonitor</span> <span class="token keyword">implements</span> <span class="token class-name">Runnable</span> <span class="token punctuation">{</span>
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<span class="token annotation punctuation">@Override</span>
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<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">run</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">getState</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">isAvailable</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token function">threadStart</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>而在这个 threadStart 里<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">protected</span> <span class="token keyword">void</span> <span class="token function">threadStart</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>backgroundProcessorDelay <span class="token operator">></span> <span class="token number">0</span>
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<span class="token operator">&&</span> <span class="token punctuation">(</span><span class="token function">getState</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">isAvailable</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">||</span> <span class="token class-name">LifecycleState</span><span class="token punctuation">.</span><span class="token constant">STARTING_PREP</span><span class="token punctuation">.</span><span class="token function">equals</span><span class="token punctuation">(</span><span class="token function">getState</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
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<span class="token operator">&&</span> <span class="token punctuation">(</span>backgroundProcessorFuture <span class="token operator">==</span> <span class="token keyword">null</span> <span class="token operator">||</span> backgroundProcessorFuture<span class="token punctuation">.</span><span class="token function">isDone</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>backgroundProcessorFuture <span class="token operator">!=</span> <span class="token keyword">null</span> <span class="token operator">&&</span> backgroundProcessorFuture<span class="token punctuation">.</span><span class="token function">isDone</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">// There was an error executing the scheduled task, get it and log it</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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backgroundProcessorFuture<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">InterruptedException</span> <span class="token operator">|</span> <span class="token class-name">ExecutionException</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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log<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span>sm<span class="token punctuation">.</span><span class="token function">getString</span><span class="token punctuation">(</span><span class="token string">"containerBase.backgroundProcess.error"</span><span class="token punctuation">)</span><span class="token punctuation">,</span> e<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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backgroundProcessorFuture <span class="token operator">=</span> <span class="token class-name">Container</span><span class="token punctuation">.</span><span class="token function">getService</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getServer</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getUtilityExecutor</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
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<span class="token punctuation">.</span><span class="token function">scheduleWithFixedDelay</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">ContainerBackgroundProcessor</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
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backgroundProcessorDelay<span class="token punctuation">,</span> backgroundProcessorDelay<span class="token punctuation">,</span>
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<span class="token class-name">TimeUnit</span><span class="token punctuation">.</span><span class="token constant">SECONDS</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>就调用了线程池的 <code>scheduleWithFixedDelay</code> 方法提交了这个 <code>ContainerBackgroundProcessor</code>，<br>仔细看代码会发现，<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">public</span> <span class="token class-name">StandardEngine</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">super</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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pipeline<span class="token punctuation">.</span><span class="token function">setBasic</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">StandardEngineValve</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token comment">/* Set the jmvRoute using the system property jvmRoute */</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<span class="token function">setJvmRoute</span><span class="token punctuation">(</span><span class="token class-name">System</span><span class="token punctuation">.</span><span class="token function">getProperty</span><span class="token punctuation">(</span><span class="token string">"jvmRoute"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">catch</span><span class="token punctuation">(</span><span class="token class-name">Exception</span> ex<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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log<span class="token punctuation">.</span><span class="token function">warn</span><span class="token punctuation">(</span>sm<span class="token punctuation">.</span><span class="token function">getString</span><span class="token punctuation">(</span><span class="token string">"standardEngine.jvmRouteFail"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token comment">// By default, the engine will hold the reloading thread</span>
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backgroundProcessorDelay <span class="token operator">=</span> <span class="token number">10</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>这个就不用开启后台热加载，而主要的热加载同学应该是<br><code>org.apache.catalina.core.StandardContext#backgroundProcess</code><pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">backgroundProcess</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token function">getState</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">isAvailable</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token class-name">Loader</span> loader <span class="token operator">=</span> <span class="token function">getLoader</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>loader <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<span class="token comment">// 这里就用了 loader 的 backgroundProcess</span>
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loader<span class="token punctuation">.</span><span class="token function">backgroundProcess</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Exception</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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log<span class="token punctuation">.</span><span class="token function">warn</span><span class="token punctuation">(</span>sm<span class="token punctuation">.</span><span class="token function">getString</span><span class="token punctuation">(</span>
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<span class="token string">"standardContext.backgroundProcess.loader"</span><span class="token punctuation">,</span> loader<span class="token punctuation">)</span><span class="token punctuation">,</span> e<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token class-name">Manager</span> manager <span class="token operator">=</span> <span class="token function">getManager</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>manager <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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manager<span class="token punctuation">.</span><span class="token function">backgroundProcess</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Exception</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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log<span class="token punctuation">.</span><span class="token function">warn</span><span class="token punctuation">(</span>sm<span class="token punctuation">.</span><span class="token function">getString</span><span class="token punctuation">(</span>
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<span class="token string">"standardContext.backgroundProcess.manager"</span><span class="token punctuation">,</span> manager<span class="token punctuation">)</span><span class="token punctuation">,</span>
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e<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token class-name">WebResourceRoot</span> resources <span class="token operator">=</span> <span class="token function">getResources</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>resources <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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resources<span class="token punctuation">.</span><span class="token function">backgroundProcess</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Exception</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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log<span class="token punctuation">.</span><span class="token function">warn</span><span class="token punctuation">(</span>sm<span class="token punctuation">.</span><span class="token function">getString</span><span class="token punctuation">(</span>
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<span class="token string">"standardContext.backgroundProcess.resources"</span><span class="token punctuation">,</span>
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resources<span class="token punctuation">)</span><span class="token punctuation">,</span> e<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token class-name">InstanceManager</span> instanceManager <span class="token operator">=</span> <span class="token function">getInstanceManager</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>instanceManager <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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instanceManager<span class="token punctuation">.</span><span class="token function">backgroundProcess</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Exception</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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log<span class="token punctuation">.</span><span class="token function">warn</span><span class="token punctuation">(</span>sm<span class="token punctuation">.</span><span class="token function">getString</span><span class="token punctuation">(</span>
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<span class="token string">"standardContext.backgroundProcess.instanceManager"</span><span class="token punctuation">,</span>
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resources<span class="token punctuation">)</span><span class="token punctuation">,</span> e<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">super</span><span class="token punctuation">.</span><span class="token function">backgroundProcess</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>loader 的后台处理就是<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token annotation punctuation">@Override</span>
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<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">backgroundProcess</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>reloadable <span class="token operator">&&</span> <span class="token function">modified</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">try</span> <span class="token punctuation">{</span>
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<span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">currentThread</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span>setContextClassLoader
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<span class="token punctuation">(</span><span class="token class-name">WebappLoader</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">.</span><span class="token function">getClassLoader</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>context <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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context<span class="token punctuation">.</span><span class="token function">reload</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span>context <span class="token operator">!=</span> <span class="token keyword">null</span> <span class="token operator">&&</span> context<span class="token punctuation">.</span><span class="token function">getLoader</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">currentThread</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span>setContextClassLoader
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<span class="token punctuation">(</span>context<span class="token punctuation">.</span><span class="token function">getLoader</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getClassLoader</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
|
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>然后又会回到 context 的 reload，也就是 StandardContext 的 reload<pre class="line-numbers language-java" data-language=java><code class=language-java><span class="token annotation punctuation">@Override</span>
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|
<span class="token keyword">public</span> <span class="token keyword">synchronized</span> <span class="token keyword">void</span> <span class="token function">reload</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">// Validate our current component state</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token function">getState</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">isAvailable</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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|
<span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">IllegalStateException</span>
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<span class="token punctuation">(</span>sm<span class="token punctuation">.</span><span class="token function">getString</span><span class="token punctuation">(</span><span class="token string">"standardContext.notStarted"</span><span class="token punctuation">,</span> <span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span><span class="token punctuation">(</span>log<span class="token punctuation">.</span><span class="token function">isInfoEnabled</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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log<span class="token punctuation">.</span><span class="token function">info</span><span class="token punctuation">(</span>sm<span class="token punctuation">.</span><span class="token function">getString</span><span class="token punctuation">(</span><span class="token string">"standardContext.reloadingStarted"</span><span class="token punctuation">,</span>
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<span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token comment">// Stop accepting requests temporarily.</span>
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<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">LifecycleException</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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log<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span>
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sm<span class="token punctuation">.</span><span class="token function">getString</span><span class="token punctuation">(</span><span class="token string">"standardContext.stoppingContext"</span><span class="token punctuation">,</span> <span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span> e<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">LifecycleException</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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sm<span class="token punctuation">.</span><span class="token function">getString</span><span class="token punctuation">(</span><span class="token string">"standardContext.startingContext"</span><span class="token punctuation">,</span> <span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span> e<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token function">setPaused</span><span class="token punctuation">(</span><span class="token boolean">false</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">if</span><span class="token punctuation">(</span>log<span class="token punctuation">.</span><span class="token function">isInfoEnabled</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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log<span class="token punctuation">.</span><span class="token function">info</span><span class="token punctuation">(</span>sm<span class="token punctuation">.</span><span class="token function">getString</span><span class="token punctuation">(</span><span class="token string">"standardContext.reloadingCompleted"</span><span class="token punctuation">,</span>
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<span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span aria-hidden=true class=line-numbers-rows><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>这样就是线程池结合后台处理，还是有些复杂的。</div><footer class=post-footer><div class=post-eof></div></footer></article></div><div class=post-block><article class=post-content itemscope itemtype=http://schema.org/Article><link href=https://nicksxs.me/2023/12/03/Windows-%E8%8E%AB%E5%90%8D%E9%87%8D%E5%90%AF%E9%97%AE%E9%A2%98%E8%A7%A3%E5%86%B3/ itemprop=mainEntityOfPage><span hidden itemprop=author itemscope itemtype=http://schema.org/Person><meta content=/uploads/avatar.jpg itemprop=image><meta content=Nicksxs itemprop=name></span><span hidden itemprop=publisher itemscope itemtype=http://schema.org/Organization><meta content="Nicksxs's Blog" itemprop=name><meta content="learn from zero,技术博客，Nicksxs，史学森" itemprop=description></span><span hidden itemprop=post itemscope itemtype=http://schema.org/CreativeWork><meta content="undefined | Nicksxs's Blog" itemprop=name><meta itemprop=description></span><header class=post-header><h2 itemprop="name headline" class=post-title><a class=post-title-link href=/2023/12/03/Windows-%E8%8E%AB%E5%90%8D%E9%87%8D%E5%90%AF%E9%97%AE%E9%A2%98%E8%A7%A3%E5%86%B3/ itemprop=url>Windows 莫名重启问题解决</a></h2><div class=post-meta-container><div class=post-meta><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-calendar"></i> </span><span class=post-meta-item-text>发表于</span> <time itemprop="dateCreated datePublished" title="创建时间：2023-12-03 19:54:34" datetime=2023-12-03T19:54:34+08:00>2023-12-03</time> </span><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-folder"></i> </span><span class=post-meta-item-text>分类于</span> <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/Windows/ itemprop=url rel=index><span itemprop=name>Windows</span></a> </span>， <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/Windows/%E5%B0%8F%E6%8A%80%E5%B7%A7/ itemprop=url rel=index><span itemprop=name>小技巧</span></a> </span></span><span class="post-meta-item leancloud_visitors" data-flag-title="Windows 莫名重启问题解决" id=/2023/12/03/Windows-%E8%8E%AB%E5%90%8D%E9%87%8D%E5%90%AF%E9%97%AE%E9%A2%98%E8%A7%A3%E5%86%B3/ title=阅读次数><span class=post-meta-item-icon><i class="far fa-eye"></i> </span><span class=post-meta-item-text>阅读次数：</span> <span class=leancloud-visitors-count></span> </span><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-comment"></i> </span><span class=post-meta-item-text>Disqus：</span> <a href=/2023/12/03/Windows-%E8%8E%AB%E5%90%8D%E9%87%8D%E5%90%AF%E9%97%AE%E9%A2%98%E8%A7%A3%E5%86%B3/#disqus_thread itemprop=discussionUrl title=disqus><span class="post-comments-count disqus-comment-count" data-disqus-identifier=2023/12/03/Windows-莫名重启问题解决/ itemprop=commentCount></span></a></span></div></div></header><div class=post-body itemprop=articleBody><p>之前在 Windows 里用 vmware workstation 搭了个黑裙，然后硬盘直通，硬盘跑着倒还好，但是宿主机 Windows 隔一段时间就会重启，就去搜索了下，发现其实 Windows 里的事件查看器就有点像是 Linux 系统里的 dmesg 或者 journal 日志，然后根据重启的时间排查事件查看器里，Windows 日志 –> 系统，<br><img data-src=https://img.nicksxs.com/blog/yN6LTC.png><br>然后可以在右侧 “筛选当前日志”里选择 eventlog 类型的，发现有这样一条事件<br>进程 C:\Windows\system32\svchost.exe (APP) 为用户 NT AUTHORITY\SYSTEM 开始计算机 APP 的 重新启动，原因如下: 操作系统: 恢复(计划内)<br>然后在网上搜索的时候发现有一些相关解答<br>可能的一种原因是系统在应用一些更新失败时，默认设置的策略是失败后重启，我们可以自己选择不重启，因为老是重启在我虚拟机里的黑裙没关机的情况下直接就断电重启了，还是可能会造成一些影响，<br>可以在资源管理器里右键计算机，选左侧的”高级系统设置” –> 然后在”高级” tab 下面有个”启动和故障恢复” –> “设置”<br>在弹出弹窗里将 “自动重新启动” 取消勾选<br><img data-src=https://img.nicksxs.com/blog/ZnhGJN.png><br>这样到目前还没继续发生过重启</div><footer class=post-footer><div class=post-eof></div></footer></article></div><nav class=pagination><span class="page-number current">1</span><a class=page-number href=/page/2/>2</a><span class=space>…</span><a class=page-number href=/page/49/>49</a><a class="extend next" aria-label=下一页 href=/page/2/ rel=next title=下一页><i class="fa fa-angle-right"></i></a></nav></div></main><footer class=footer><div class=footer-inner><div class=beian><a href=https://beian.miit.gov.cn/ rel=noopener target=_blank>浙ICP备16002580号-2 </a><img alt src=/uploads/beian.png><a href=http://www.beian.gov.cn/portal/registerSystemInfo?recordcode=33010602011094 rel=noopener target=_blank>浙公网安备 33010602011094号</a></div><div class=copyright>© <span itemprop=copyrightYear>2024</span><span class=with-love><i class="fa fa-heart"></i> </span><span class=author itemprop=copyrightHolder>Nicksxs</span></div><div 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