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自动装配调用链。springboot 相比 spring能更方便开发人员上手,比较重要的一点就是自动装配,大致来看下这个逻辑" itemprop=description></span><header class=post-header><h1 itemprop="name headline" class=post-title>聊聊 SpringBoot 自动装配</h1><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:2021-07-11 23:01:30" datetime=2021-07-11T23:01:30+08:00>2021-07-11</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/SpringBoot/ itemprop=url rel=index><span itemprop=name>SpringBoot</span></a> </span></span><span class="post-meta-item cloudflare-page-counter" data-title="聊聊 SpringBoot 自动装配" data-increment=true data-path=/2021/07/11/%E8%81%8A%E8%81%8ASpringBoot-%E8%87%AA%E5%8A%A8%E8%A3%85%E9%85%8D/ 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=cloudflare-page-counter-count></span></span></div><div class=post-description>springboot 自动装配调用链。springboot 相比 spring能更方便开发人员上手,比较重要的一点就是自动装配,大致来看下这个逻辑</div></div></header><div class=post-body itemprop=articleBody><p>springboot 自动装配调用链<p>springboot 相比 spring能更方便开发人员上手,比较重要的一点就是自动装配,大致来看下这个逻辑<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class=keyword>static</span> <span class=keyword>void</span> <span class="title function_">main</span><span class=params>(String[] args)</span> {</span><br><span class=line> SpringApplication.run(SpbDemoApplication.class, args);</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>/**</span></span><br><span class=line><span class=comment> * Static helper that can be used to run a {<span class=doctag>@link</span> SpringApplication} from the</span></span><br><span class=line><span class=comment> * specified source using default settings.</span></span><br><span class=line><span class=comment> * <span class=doctag>@param</span> primarySource the primary source to load</span></span><br><span class=line><span class=comment> * <span class=doctag>@param</span> args the application arguments (usually passed from a Java main method)</span></span><br><span class=line><span class=comment> * <span class=doctag>@return</span> the running {<span class=doctag>@link</span> ApplicationContext}</span></span><br><span class=line><span class=comment> */</span></span><br></pre></table></figure><p>然后就是上面调用的 run 方法<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class=keyword>static</span> ConfigurableApplicationContext <span class="title function_">run</span><span class=params>(Class&LT?> primarySource, String... args)</span> {</span><br><span class=line> <span class=keyword>return</span> run(<span class=keyword>new</span> <span class="title class_">Class</span>&LT?>[] { primarySource }, args);</span><br><span class=line>}</span><br><span class=line></span><br><span class=line><span class=comment>/**</span></span><br><span class=line><span class=comment> * Static helper that can be used to run a {<span class=doctag>@link</span> SpringApplication} from the</span></span><br><span class=line><span class=comment> * specified sources using default settings and user supplied arguments.</span></span><br><span class=line><span class=comment> * <span class=doctag>@param</span> primarySources the primary sources to load</span></span><br><span class=line><span class=comment> * <span class=doctag>@param</span> args the application arguments (usually passed from a Java main method)</span></span><br><span class=line><span class=comment> * <span class=doctag>@return</span> the running {<span class=doctag>@link</span> ApplicationContext}</span></span><br><span class=line><span class=comment> */</span></span><br></pre></table></figure><p>继续往下看<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br></pre><td class=code><pre><span class=line><span class=keyword>public</span> <span class=keyword>static</span> ConfigurableApplicationContext <span class="title function_">run</span><span class=params>(Class&LT?>[] primarySources, String[] args)</span> {</span><br><span class=line> <span class=keyword>return</span> <span class=keyword>new</span> <span class="title class_">SpringApplication</span>(primarySources).run(args);</span><br><span class=line>}</span><br></pre></table></figure><span id=more></span><p>调用SpringApplication的构造方法<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br></pre><td class=code><pre><span class=line><span class=comment>/**</span></span><br><span class=line><span class=comment> * Create a new {<span class=doctag>@link</span> SpringApplication} instance. The application context will load</span></span><br><span class=line><span class=comment> * beans from the specified primary sources (see {<span class=doctag>@link</span> SpringApplication class-level}</span></span><br><span class=line><span class=comment> * documentation for details. The instance can be customized before calling</span></span><br><span class=line><span class=comment> * {<span class=doctag>@link</span> #run(String...)}.</span></span><br><span class=line><span class=comment> * <span class=doctag>@param</span> primarySources the primary bean sources</span></span><br><span class=line><span class=comment> * <span class=doctag>@see</span> #run(Class, String[])</span></span><br><span class=line><span class=comment> * <span class=doctag>@see</span> #SpringApplication(ResourceLoader, Class...)</span></span><br><span class=line><span class=comment> * <span class=doctag>@see</span> #setSources(Set)</span></span><br><span class=line><span class=comment> */</span></span><br><span class=line></span><br><span class=line><span class=keyword>public</span> <span class="title function_">SpringApplication</span><span class=params>(Class&LT?>... primarySources)</span> {</span><br><span class=line> <span class=built_in>this</span>(<span class=literal>null</span>, primarySources);</span><br><span class=line>}</span><br><span class=line></span><br><span class=line><span class=comment>/**</span></span><br><span class=line><span class=comment> * Create a new {<span class=doctag>@link</span> SpringApplication} instance. The application context will load</span></span><br><span class=line><span class=comment> * beans from the specified primary sources (see {<span class=doctag>@link</span> SpringApplication class-level}</span></span><br><span class=line><span class=comment> * documentation for details. The instance can be customized before calling</span></span><br><span class=line><span class=comment> * {<span class=doctag>@link</span> #run(String...)}.</span></span><br><span class=line><span class=comment> * <span class=doctag>@param</span> resourceLoader the resource loader to use</span></span><br><span class=line><span class=comment> * <span class=doctag>@param</span> primarySources the primary bean sources</span></span><br><span class=line><span class=comment> * <span class=doctag>@see</span> #run(Class, String[])</span></span><br><span class=line><span class=comment> * <span class=doctag>@see</span> #setSources(Set)</span></span><br><span class=line><span class=comment> */</span></span><br><span class=line><span class=meta>@SuppressWarnings({ "unchecked", "rawtypes" })</span></span><br><span class=line><span class=keyword>public</span> <span class="title function_">SpringApplication</span><span class=params>(ResourceLoader resourceLoader, Class&LT?>... primarySources)</span> {</span><br><span class=line> <span class=built_in>this</span>.resourceLoader = resourceLoader;</span><br><span class=line> Assert.notNull(primarySources, <span class=string>"PrimarySources must not be null"</span>);</span><br><span class=line> <span class=built_in>this</span>.primarySources = <span class=keyword>new</span> <span class="title class_">LinkedHashSet</span><>(Arrays.asList(primarySources));</span><br><span class=line> <span class=built_in>this</span>.webApplicationType = WebApplicationType.deduceFromClasspath();</span><br><span class=line> <span class=comment>// 注意看这里的,通过 SpringFactories 获取</span></span><br><span class=line> <span class=built_in>this</span>.bootstrapRegistryInitializers = getBootstrapRegistryInitializersFromSpringFactories();</span><br><span class=line> setInitializers((Collection) getSpringFactoriesInstances(ApplicationContextInitializer.class));</span><br><span class=line> setListeners((Collection) getSpringFactoriesInstances(ApplicationListener.class));</span><br><span class=line> <span class=built_in>this</span>.mainApplicationClass = deduceMainApplicationClass();</span><br><span class=line>}</span><br></pre></table></figure><p>这里就是重点了<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br></pre><td class=code><pre><span class=line><span class=keyword>private</span> List&LTBootstrapRegistryInitializer> <span class="title function_">getBootstrapRegistryInitializersFromSpringFactories</span><span class=params>()</span> {</span><br><span class=line> ArrayList&LTBootstrapRegistryInitializer> initializers = <span class=keyword>new</span> <span class="title class_">ArrayList</span><>();</span><br><span class=line> getSpringFactoriesInstances(Bootstrapper.class).stream()</span><br><span class=line> .map((bootstrapper) -> ((BootstrapRegistryInitializer) bootstrapper::initialize))</span><br><span class=line> .forEach(initializers::add);</span><br><span class=line> initializers.addAll(getSpringFactoriesInstances(BootstrapRegistryInitializer.class));</span><br><span class=line> <span class=keyword>return</span> initializers;</span><br><span class=line>}</span><br><span class=line><span class=keyword>private</span> &LTT> Collection&LTT> <span class="title function_">getSpringFactoriesInstances</span><span class=params>(Class&LTT> type)</span> {</span><br><span class=line> <span class=keyword>return</span> getSpringFactoriesInstances(type, <span class=keyword>new</span> <span class="title class_">Class</span>&LT?>[] {});</span><br><span class=line>}</span><br><span class=line></span><br><span class=line><span class=keyword>private</span> &LTT> Collection&LTT> <span class="title function_">getSpringFactoriesInstances</span><span class=params>(Class&LTT> type, Class&LT?>[] parameterTypes, Object... args)</span> {</span><br><span class=line> <span class=type>ClassLoader</span> <span class=variable>classLoader</span> <span class=operator>=</span> getClassLoader();</span><br><span class=line> <span class=comment>// Use names and ensure unique to protect against duplicates</span></span><br><span class=line> <span class=comment>// 去加载所有FACTORIES_RESOURCE_LOCATION路径下面,也就是 META-INF/spring.factories</span></span><br><span class=line> Set&LTString> names = <span class=keyword>new</span> <span class="title class_">LinkedHashSet</span><>(SpringFactoriesLoader.loadFactoryNames(type, classLoader));</span><br><span class=line> List&LTT> instances = createSpringFactoriesInstances(type, parameterTypes, classLoader, args, names);</span><br><span class=line> AnnotationAwareOrderComparator.sort(instances);</span><br><span class=line> <span class=keyword>return</span> instances;</span><br><span class=line>}</span><br></pre></table></figure><figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br><span class=line>41</span><br><span class=line>42</span><br><span class=line>43</span><br><span class=line>44</span><br><span class=line>45</span><br><span class=line>46</span><br><span class=line>47</span><br><span class=line>48</span><br><span class=line>49</span><br><span class=line>50</span><br><span class=line>51</span><br><span class=line>52</span><br><span class=line>53</span><br><span class=line>54</span><br><span class=line>55</span><br><span class=line>56</span><br><span class=line>57</span><br><span class=line>58</span><br></pre><td class=code><pre><span class=line></span><br><span class=line><span class=comment>/**</span></span><br><span class=line><span class=comment> * Load the fully qualified class names of factory implementations of the</span></span><br><span class=line><span class=comment> * given type from {<span class=doctag>@value</span> #FACTORIES_RESOURCE_LOCATION}, using the given</span></span><br><span class=line><span class=comment> * class loader.</span></span><br><span class=line><span class=comment> * &LTp>As of Spring Framework 5.3, if a particular implementation class name</span></span><br><span class=line><span class=comment> * is discovered more than once for the given factory type, duplicates will</span></span><br><span class=line><span class=comment> * be ignored.</span></span><br><span class=line><span class=comment> * <span class=doctag>@param</span> factoryType the interface or abstract class representing the factory</span></span><br><span class=line><span class=comment> * <span class=doctag>@param</span> classLoader the ClassLoader to use for loading resources; can be</span></span><br><span class=line><span class=comment> * {<span class=doctag>@code</span> null} to use the default</span></span><br><span class=line><span class=comment> * <span class=doctag>@throws</span> IllegalArgumentException if an error occurs while loading factory names</span></span><br><span class=line><span class=comment> * <span class=doctag>@see</span> #loadFactories</span></span><br><span class=line><span class=comment> */</span></span><br><span class=line><span class=keyword>public</span> <span class=keyword>static</span> List&LTString> <span class="title function_">loadFactoryNames</span><span class=params>(Class&LT?> factoryType, <span class=meta>@Nullable</span> ClassLoader classLoader)</span> {</span><br><span class=line> <span class=type>ClassLoader</span> <span class=variable>classLoaderToUse</span> <span class=operator>=</span> classLoader;</span><br><span class=line> <span class=keyword>if</span> (classLoaderToUse == <span class=literal>null</span>) {</span><br><span class=line> classLoaderToUse = SpringFactoriesLoader.class.getClassLoader();</span><br><span class=line> }</span><br><span class=line> <span class=type>String</span> <span class=variable>factoryTypeName</span> <span class=operator>=</span> factoryType.getName();</span><br><span class=line> <span class=keyword>return</span> loadSpringFactories(classLoaderToUse).getOrDefault(factoryTypeName, Collections.emptyList());</span><br><span class=line>}</span><br><span class=line> <span class=keyword>private</span> <span class=keyword>static</span> Map&LTString, List&LTString>> <span class="title function_">loadSpringFactories</span><span class=params>(ClassLoader classLoader)</span> {</span><br><span class=line> Map&LTString, List&LTString>> result = cache.get(classLoader);</span><br><span class=line> <span class=keyword>if</span> (result != <span class=literal>null</span>) {</span><br><span class=line> <span class=keyword>return</span> result;</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> result = <span class=keyword>new</span> <span class="title class_">HashMap</span><>();</span><br><span class=line> <span class=keyword>try</span> {</span><br><span class=line> <span class=comment>// 获取此 resources,作为 AutoConfiguration 的配置</span></span><br><span class=line> Enumeration&LTURL> urls = classLoader.getResources(FACTORIES_RESOURCE_LOCATION);</span><br><span class=line> <span class=keyword>while</span> (urls.hasMoreElements()) {</span><br><span class=line> <span class=type>URL</span> <span class=variable>url</span> <span class=operator>=</span> urls.nextElement();</span><br><span class=line> <span class=type>UrlResource</span> <span class=variable>resource</span> <span class=operator>=</span> <span class=keyword>new</span> <span class="title class_">UrlResource</span>(url);</span><br><span class=line> <span class=type>Properties</span> <span class=variable>properties</span> <span class=operator>=</span> PropertiesLoaderUtils.loadProperties(resource);</span><br><span class=line> <span class=keyword>for</span> (Map.Entry&LT?, ?> entry : properties.entrySet()) {</span><br><span class=line> <span class=type>String</span> <span class=variable>factoryTypeName</span> <span class=operator>=</span> ((String) entry.getKey()).trim();</span><br><span class=line> String[] factoryImplementationNames =</span><br><span class=line> StringUtils.commaDelimitedListToStringArray((String) entry.getValue());</span><br><span class=line> <span class=keyword>for</span> (String factoryImplementationName : factoryImplementationNames) {</span><br><span class=line> result.computeIfAbsent(factoryTypeName, key -> <span class=keyword>new</span> <span class="title class_">ArrayList</span><>())</span><br><span class=line> .add(factoryImplementationName.trim());</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line> }</span><br><span class=line></span><br><span class=line> <span class=comment>// Replace all lists with unmodifiable lists containing unique elements</span></span><br><span class=line> result.replaceAll((factoryType, implementations) -> implementations.stream().distinct()</span><br><span class=line> .collect(Collectors.collectingAndThen(Collectors.toList(), Collections::unmodifiableList)));</span><br><span class=line> cache.put(classLoader, result);</span><br><span class=line> }</span><br><span class=line> <span class=keyword>catch</span> (IOException ex) {</span><br><span class=line> <span class=keyword>throw</span> <span class=keyword>new</span> <span class="title class_">IllegalArgumentException</span>(<span class=string>"Unable to load factories from location ["</span> +</span><br><span class=line> FACTORIES_RESOURCE_LOCATION + <span class=string>"]"</span>, ex);</span><br><span class=line> }</span><br><span class=line> <span class=keyword>return</span> result;</span><br><span class=line>}</span><br></pre></table></figure><p>我们可以看下 spring-boot-autoconfigure 的 META-INF/spring.factories<figure class="highlight java"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br><span class=line>17</span><br><span class=line>18</span><br><span class=line>19</span><br><span class=line>20</span><br><span class=line>21</span><br><span class=line>22</span><br><span class=line>23</span><br><span class=line>24</span><br><span class=line>25</span><br><span class=line>26</span><br><span class=line>27</span><br><span class=line>28</span><br><span class=line>29</span><br><span class=line>30</span><br><span class=line>31</span><br><span class=line>32</span><br><span class=line>33</span><br><span class=line>34</span><br><span class=line>35</span><br><span class=line>36</span><br><span class=line>37</span><br><span class=line>38</span><br><span class=line>39</span><br><span class=line>40</span><br><span class=line>41</span><br><span class=line>42</span><br><span class=line>43</span><br><span class=line>44</span><br><span class=line>45</span><br><span class=line>46</span><br><span class=line>47</span><br><span class=line>48</span><br><span class=line>49</span><br><span class=line>50</span><br><span class=line>51</span><br><span class=line>52</span><br><span class=line>53</span><br><span class=line>54</span><br><span class=line>55</span><br><span class=line>56</span><br><span class=line>57</span><br><span class=line>58</span><br><span class=line>59</span><br><span class=line>60</span><br><span class=line>61</span><br><span class=line>62</span><br><span class=line>63</span><br><span class=line>64</span><br><span class=line>65</span><br><span class=line>66</span><br><span class=line>67</span><br><span class=line>68</span><br><span class=line>69</span><br><span class=line>70</span><br><span class=line>71</span><br><span class=line>72</span><br><span class=line>73</span><br><span class=line>74</span><br><span class=line>75</span><br><span class=line>76</span><br><span class=line>77</span><br><span class=line>78</span><br><span class=line>79</span><br><span class=line>80</span><br><span class=line>81</span><br><span class=line>82</span><br><span class=line>83</span><br><span class=line>84</span><br><span class=line>85</span><br><span class=line>86</span><br><span class=line>87</span><br><span class=line>88</span><br><span class=line>89</span><br><span class=line>90</span><br><span class=line>91</span><br><span class=line>92</span><br><span class=line>93</span><br><span class=line>94</span><br><span class=line>95</span><br><span class=line>96</span><br><span class=line>97</span><br><span class=line>98</span><br><span class=line>99</span><br><span class=line>100</span><br><span class=line>101</span><br><span class=line>102</span><br><span class=line>103</span><br><span class=line>104</span><br><span class=line>105</span><br><span class=line>106</span><br><span class=line>107</span><br><span class=line>108</span><br><span class=line>109</span><br><span class=line>110</span><br><span class=line>111</span><br><span class=line>112</span><br><span class=line>113</span><br><span class=line>114</span><br><span class=line>115</span><br><span class=line>116</span><br><span class=line>117</span><br><span class=line>118</span><br><span class=line>119</span><br><span class=line>120</span><br><span class=line>121</span><br><span class=line>122</span><br><span class=line>123</span><br><span class=line>124</span><br><span class=line>125</span><br><span class=line>126</span><br><span class=line>127</span><br><span class=line>128</span><br><span class=line>129</span><br><span class=line>130</span><br><span class=line>131</span><br><span class=line>132</span><br><span class=line>133</span><br><span class=line>134</span><br><span class=line>135</span><br><span class=line>136</span><br><span class=line>137</span><br><span class=line>138</span><br><span class=line>139</span><br><span class=line>140</span><br><span class=line>141</span><br><span class=line>142</span><br><span class=line>143</span><br><span class=line>144</span><br><span class=line>145</span><br><span class=line>146</span><br><span class=line>147</span><br><span class=line>148</span><br><span class=line>149</span><br><span class=line>150</span><br><span class=line>151</span><br><span class=line>152</span><br><span class=line>153</span><br><span class=line>154</span><br><span class=line>155</span><br><span class=line>156</span><br><span class=line>157</span><br><span class=line>158</span><br><span class=line>159</span><br><span class=line>160</span><br><span class=line>161</span><br><span class=line>162</span><br><span class=line>163</span><br><span class=line>164</span><br><span class=line>165</span><br><span class=line>166</span><br><span class=line>167</span><br><span class=line>168</span><br><span class=line>169</span><br><span class=line>170</span><br><span class=line>171</span><br><span class=line>172</span><br><span class=line>173</span><br><span class=line>174</span><br><span class=line>175</span><br><span class=line>176</span><br><span class=line>177</span><br><span class=line>178</span><br><span class=line>179</span><br><span class=line>180</span><br><span class=line>181</span><br></pre><td class=code><pre><span class=line># Initializers</span><br><span class=line>org.springframework.context.ApplicationContextInitializer=\</span><br><span class=line>org.springframework.boot.autoconfigure.SharedMetadataReaderFactoryContextInitializer,\</span><br><span class=line>org.springframework.boot.autoconfigure.logging.ConditionEvaluationReportLoggingListener</span><br><span class=line></span><br><span class=line># Application Listeners</span><br><span class=line>org.springframework.context.ApplicationListener=\</span><br><span class=line>org.springframework.boot.autoconfigure.BackgroundPreinitializer</span><br><span class=line></span><br><span class=line># Environment Post Processors</span><br><span class=line>org.springframework.boot.env.EnvironmentPostProcessor=\</span><br><span class=line>org.springframework.boot.autoconfigure.integration.IntegrationPropertiesEnvironmentPostProcessor</span><br><span class=line></span><br><span class=line># Auto Configuration Import Listeners</span><br><span class=line>org.springframework.boot.autoconfigure.AutoConfigurationImportListener=\</span><br><span class=line>org.springframework.boot.autoconfigure.condition.ConditionEvaluationReportAutoConfigurationImportListener</span><br><span class=line></span><br><span class=line># Auto Configuration Import Filters</span><br><span class=line>org.springframework.boot.autoconfigure.AutoConfigurationImportFilter=\</span><br><span class=line>org.springframework.boot.autoconfigure.condition.OnBeanCondition,\</span><br><span class=line>org.springframework.boot.autoconfigure.condition.OnClassCondition,\</span><br><span class=line>org.springframework.boot.autoconfigure.condition.OnWebApplicationCondition</span><br><span class=line></span><br><span class=line># 注意这里,其实就是类似于 dubbo spi 的通过 org.springframework.boot.autoconfigure.EnableAutoConfiguration作为 key</span><br><span class=line># 获取下面所有的 AutoConfiguration 配置类</span><br><span class=line># Auto Configure</span><br><span class=line>org.springframework.boot.autoconfigure.EnableAutoConfiguration=\</span><br><span class=line>org.springframework.boot.autoconfigure.admin.SpringApplicationAdminJmxAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.aop.AopAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.amqp.RabbitAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.batch.BatchAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.cache.CacheAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.cassandra.CassandraAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.context.ConfigurationPropertiesAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.context.LifecycleAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.context.MessageSourceAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.couchbase.CouchbaseAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.dao.PersistenceExceptionTranslationAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.cassandra.CassandraDataAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.cassandra.CassandraReactiveDataAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.cassandra.CassandraReactiveRepositoriesAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.cassandra.CassandraRepositoriesAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.couchbase.CouchbaseDataAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.couchbase.CouchbaseReactiveDataAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.couchbase.CouchbaseReactiveRepositoriesAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.couchbase.CouchbaseRepositoriesAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchDataAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchRepositoriesAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.elasticsearch.ReactiveElasticsearchRepositoriesAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.elasticsearch.ReactiveElasticsearchRestClientAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.jdbc.JdbcRepositoriesAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.jpa.JpaRepositoriesAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.ldap.LdapRepositoriesAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.mongo.MongoDataAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.mongo.MongoReactiveDataAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.mongo.MongoReactiveRepositoriesAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.mongo.MongoRepositoriesAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.neo4j.Neo4jDataAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.neo4j.Neo4jReactiveDataAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.neo4j.Neo4jReactiveRepositoriesAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.neo4j.Neo4jRepositoriesAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.r2dbc.R2dbcDataAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.r2dbc.R2dbcRepositoriesAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.redis.RedisReactiveAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.redis.RedisRepositoriesAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.rest.RepositoryRestMvcAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.data.web.SpringDataWebAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.elasticsearch.ElasticsearchRestClientAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.flyway.FlywayAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.freemarker.FreeMarkerAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.groovy.template.GroovyTemplateAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.gson.GsonAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.h2.H2ConsoleAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.hateoas.HypermediaAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.hazelcast.HazelcastAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.hazelcast.HazelcastJpaDependencyAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.http.HttpMessageConvertersAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.http.codec.CodecsAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.influx.InfluxDbAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.info.ProjectInfoAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.integration.IntegrationAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.jdbc.JdbcTemplateAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.jdbc.JndiDataSourceAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.jdbc.XADataSourceAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.jms.JmsAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.jmx.JmxAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.jms.JndiConnectionFactoryAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.jms.activemq.ActiveMQAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.jms.artemis.ArtemisAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.jersey.JerseyAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.jooq.JooqAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.jsonb.JsonbAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.kafka.KafkaAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.availability.ApplicationAvailabilityAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.ldap.embedded.EmbeddedLdapAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.ldap.LdapAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.liquibase.LiquibaseAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.mail.MailSenderAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.mail.MailSenderValidatorAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.mongo.embedded.EmbeddedMongoAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.mongo.MongoReactiveAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.mustache.MustacheAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.neo4j.Neo4jAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.netty.NettyAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.quartz.QuartzAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.r2dbc.R2dbcAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.r2dbc.R2dbcTransactionManagerAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.rsocket.RSocketMessagingAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.rsocket.RSocketRequesterAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.rsocket.RSocketServerAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.rsocket.RSocketStrategiesAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.security.servlet.UserDetailsServiceAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.security.servlet.SecurityFilterAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.security.reactive.ReactiveSecurityAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.security.reactive.ReactiveUserDetailsServiceAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.security.rsocket.RSocketSecurityAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.security.saml2.Saml2RelyingPartyAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.sendgrid.SendGridAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.session.SessionAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.security.oauth2.client.servlet.OAuth2ClientAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.security.oauth2.client.reactive.ReactiveOAuth2ClientAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.security.oauth2.resource.servlet.OAuth2ResourceServerAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.security.oauth2.resource.reactive.ReactiveOAuth2ResourceServerAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.solr.SolrAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.sql.init.SqlInitializationAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.task.TaskExecutionAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.task.TaskSchedulingAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.thymeleaf.ThymeleafAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.transaction.TransactionAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.transaction.jta.JtaAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.validation.ValidationAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.web.client.RestTemplateAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.web.embedded.EmbeddedWebServerFactoryCustomizerAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.web.reactive.HttpHandlerAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.web.reactive.ReactiveWebServerFactoryAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.web.reactive.WebFluxAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.web.reactive.error.ErrorWebFluxAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.web.reactive.function.client.ClientHttpConnectorAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.web.reactive.function.client.WebClientAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.web.servlet.DispatcherServletAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.web.servlet.HttpEncodingAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.web.servlet.MultipartAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.websocket.reactive.WebSocketReactiveAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.websocket.servlet.WebSocketServletAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.websocket.servlet.WebSocketMessagingAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.webservices.WebServicesAutoConfiguration,\</span><br><span class=line>org.springframework.boot.autoconfigure.webservices.client.WebServiceTemplateAutoConfiguration</span><br><span class=line></span><br><span class=line># Failure analyzers</span><br><span class=line>org.springframework.boot.diagnostics.FailureAnalyzer=\</span><br><span class=line>org.springframework.boot.autoconfigure.data.redis.RedisUrlSyntaxFailureAnalyzer,\</span><br><span class=line>org.springframework.boot.autoconfigure.diagnostics.analyzer.NoSuchBeanDefinitionFailureAnalyzer,\</span><br><span class=line>org.springframework.boot.autoconfigure.flyway.FlywayMigrationScriptMissingFailureAnalyzer,\</span><br><span class=line>org.springframework.boot.autoconfigure.jdbc.DataSourceBeanCreationFailureAnalyzer,\</span><br><span class=line>org.springframework.boot.autoconfigure.jdbc.HikariDriverConfigurationFailureAnalyzer,\</span><br><span class=line>org.springframework.boot.autoconfigure.r2dbc.ConnectionFactoryBeanCreationFailureAnalyzer,\</span><br><span class=line>org.springframework.boot.autoconfigure.session.NonUniqueSessionRepositoryFailureAnalyzer</span><br><span class=line></span><br><span class=line># Template availability providers</span><br><span class=line>org.springframework.boot.autoconfigure.template.TemplateAvailabilityProvider=\</span><br><span class=line>org.springframework.boot.autoconfigure.freemarker.FreeMarkerTemplateAvailabilityProvider,\</span><br><span class=line>org.springframework.boot.autoconfigure.mustache.MustacheTemplateAvailabilityProvider,\</span><br><span class=line>org.springframework.boot.autoconfigure.groovy.template.GroovyTemplateAvailabilityProvider,\</span><br><span class=line>org.springframework.boot.autoconfigure.thymeleaf.ThymeleafTemplateAvailabilityProvider,\</span><br><span class=line>org.springframework.boot.autoconfigure.web.servlet.JspTemplateAvailabilityProvider</span><br><span class=line></span><br><span class=line># DataSource initializer detectors</span><br><span class=line>org.springframework.boot.sql.init.dependency.DatabaseInitializerDetector=\</span><br><span class=line>org.springframework.boot.autoconfigure.flyway.FlywayMigrationInitializerDatabaseInitializerDetector</span><br><span class=line></span><br></pre></table></figure><p>上面根据 org.springframework.boot.autoconfigure.EnableAutoConfiguration 获取的各个配置类,在通过反射加载就能得到一堆 JavaConfig配置类,然后再根据 ConditionalOnProperty等条件配置加载具体的 bean,大致就是这么个逻辑</div><footer class=post-footer><div class="affiliate-creative affiliate-creative--post-end" data-affiliate-id=tencent-cloud-general><a rel="sponsored noopener" aria-label=腾讯云产品优惠 href=https://cloud.tencent.com/act/cps/redirect?redirect=2446&cps_key=2e33a1eedb380997d03618b4a5ba6ca7&from=console target=_blank><img alt=腾讯云服务器、数据库和云产品优惠 decoding=async height=419 loading=lazy src=/uploads/affiliate/tencent-cloud-general.webp width=690> </a><span class=affiliate-disclosure>推广</span></div><div class=reward-container><div>请我一杯咖啡吧!</div><button>赞赏</button><div class=post-reward><div><img alt="Nicksxs 微信" src=https://i.loli.net/2020/01/12/NUlWanT31E8LQGx.png><span>微信</span></div><div><img alt="Nicksxs 支付宝" src=https://ooo.0o0.ooo/2016/08/17/57b421e773057.jpg><span>支付宝</span></div></div></div><div class=post-copyright><ul><li 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