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url('https://img-blog.csdnimg.cn/1b40502ab717476ba8ee7df0931ea527.png')"><nav id="nav"><span id="blog_name"><a id="site-name" href="/">实现一个小目标</a></span><div id="menus"><div class="menus_items"><div class="menus_item"><a class="site-page" href="/"><i class="fa-fw fas fa-home"></i><span> 主页</span></a></div><div class="menus_item"><a class="site-page" href="/archives/"><i class="fa-fw fas fa-archive"></i><span> 时间轴</span></a></div><div class="menus_item"><a class="site-page" href="/tags/"><i class="fa-fw fas fa-tags"></i><span> 标签</span></a></div><div class="menus_item"><a class="site-page" href="/categories/"><i class="fa-fw fas fa-folder-open"></i><span> 分类</span></a></div><div class="menus_item"><a class="site-page group" href="javascript:void(0);"><i class="fa-fw fas fa-list"></i><span> 清单</span><i class="fas fa-chevron-down"></i></a><ul class="menus_item_child"><li><a class="site-page child" href="/music/"><i class="fa-fw fas fa-music"></i><span> 音乐</span></a></li><li><a class="site-page child" href="/movies/"><i class="fa-fw fas fa-video"></i><span> 电影</span></a></li></ul></div><div class="menus_item"><a class="site-page" href="/link/"><i class="fa-fw fas fa-link"></i><span> 友情链接</span></a></div><div class="menus_item"><a class="site-page" href="/about/"><i class="fa-fw fas fa-heart"></i><span> 关于</span></a></div></div><div id="toggle-menu"><a class="site-page"><i class="fas fa-bars fa-fw"></i></a></div></div></nav><div id="post-info"><h1 class="post-title">Spring IoC 容器初始化主体流程</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2022-06-15T06:51:45.000Z" title="发表于 2022-06-15 14:51:45">2022-06-15</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" 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class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title="Spring IoC 容器初始化主体流程"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"><i class="fa-solid fa-spinner fa-spin"></i></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h1 id="Spring-IoC容器初始化主体流程"><a href="#Spring-IoC容器初始化主体流程" class="headerlink" title="Spring IoC容器初始化主体流程"></a>Spring IoC容器初始化主体流程</h1><h2 id="Spring-IoC-的容器体系"><a href="#Spring-IoC-的容器体系" class="headerlink" title="Spring IoC 的容器体系"></a>Spring IoC 的容器体系</h2><p>IoC 容器是 Spring 的核心模块，是抽象了对象管理、依赖关系管理的框架解决方案。Spring 提供了很多的容器，其中 BeanFactory 是顶层容器（根容器），不能被实例化，它定义了所有 IoC 容器必须遵从的一套原则，具体的容器实现可以增加额外的功能。<br>比如我们常用到的 ApplicationContext，其下更具体的实现如 ClassPathXmlApplicationContext 包含了解析 xml 等一系列的内容， AnnotationConfigApplicationContext 则是包含了注解解析等一系列的内容。<br>Spring IoC 容器继承体系非常灵活，需要使用哪个层次用哪个层次即可，不必使用功能大而全的。</p>
<h3 id="BeanFactory-顶级接口方法栈"><a href="#BeanFactory-顶级接口方法栈" class="headerlink" title="BeanFactory 顶级接口方法栈"></a>BeanFactory 顶级接口方法栈</h3><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><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">interface</span> <span class="title class_">BeanFactory</span> {</span><br><span class="line"> </span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 返回 FactoryBean，而不是 FactoryBean 产生的 bean</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="type">String</span> <span class="variable">FACTORY_BEAN_PREFIX</span> <span class="operator">=</span> <span class="string">"&"</span>;</span><br><span class="line"> </span><br><span class="line"> Object <span class="title function_">getBean</span><span class="params">(String name)</span> <span class="keyword">throws</span> BeansException;</span><br><span class="line"> </span><br><span class="line"> <T> T <span class="title function_">getBean</span><span class="params">(String name, Class<T> requiredType)</span> <span class="keyword">throws</span> BeansException;</span><br><span class="line"> </span><br><span class="line"> Object <span class="title function_">getBean</span><span class="params">(String name, Object... args)</span> <span class="keyword">throws</span> BeansException;</span><br><span class="line"> </span><br><span class="line"> <T> T <span class="title function_">getBean</span><span class="params">(Class<T> requiredType)</span> <span class="keyword">throws</span> BeansException;</span><br><span class="line"> </span><br><span class="line"> <T> T <span class="title function_">getBean</span><span class="params">(Class<T> requiredType, Object... args)</span> <span class="keyword">throws</span> BeansException;</span><br><span class="line"> </span><br><span class="line"> <T> ObjectProvider<T> <span class="title function_">getBeanProvider</span><span class="params">(Class<T> requiredType)</span>;</span><br><span class="line"> </span><br><span class="line"> <T> ObjectProvider<T> <span class="title function_">getBeanProvider</span><span class="params">(ResolvableType requiredType)</span>;</span><br><span class="line"> </span><br><span class="line"> <span class="type">boolean</span> <span class="title function_">containsBean</span><span class="params">(String name)</span>;</span><br><span class="line"> </span><br><span class="line"> <span class="type">boolean</span> <span class="title function_">isSingleton</span><span class="params">(String name)</span> <span class="keyword">throws</span> NoSuchBeanDefinitionException;</span><br><span class="line"> </span><br><span class="line"> <span class="type">boolean</span> <span class="title function_">isPrototype</span><span class="params">(String name)</span> <span class="keyword">throws</span> NoSuchBeanDefinitionException;</span><br><span class="line"> </span><br><span class="line"> <span class="type">boolean</span> <span class="title function_">isTypeMatch</span><span class="params">(String name, ResolvableType typeToMatch)</span> <span class="keyword">throws</span> NoSuchBeanDefinitionException;</span><br><span class="line"> </span><br><span class="line"> <span class="type">boolean</span> <span class="title function_">isTypeMatch</span><span class="params">(String name, Class<?> typeToMatch)</span> <span class="keyword">throws</span> NoSuchBeanDefinitionException;</span><br><span class="line"> </span><br><span class="line"> <span class="meta">@Nullable</span></span><br><span class="line"> Class<?> getType(String name) <span class="keyword">throws</span> NoSuchBeanDefinitionException;</span><br><span class="line"> </span><br><span class="line"> String[] getAliases(String name);</span><br><span class="line">}</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<h3 id="BeanFactory-容器继承体系"><a href="#BeanFactory-容器继承体系" class="headerlink" title="BeanFactory 容器继承体系"></a>BeanFactory 容器继承体系</h3><p><img src="https://img-blog.csdnimg.cn/1b40502ab717476ba8ee7df0931ea527.png"></p>
<h2 id="Bean-生命周期关键时机点"><a href="#Bean-生命周期关键时机点" class="headerlink" title="Bean 生命周期关键时机点"></a>Bean 生命周期关键时机点</h2><p>思路：创建一个类 LagouBean ，让其实现几个特殊的接口，并分别在接口实现的构造器、接口方法中断点，观察线程调用栈，分析出 Bean 对象创建和管理关键点的触发时机。</p>
<p>Bean 构造器执行、初始化方法（afterPropertiesSet）执行、Bean 后置处理器的 before/after 方法：</p>
<ul>
<li>AbstractApplicationContext#refresh()</li>
<li>AbstractApplicationContext#finishBeanFactoryInitialization(ConfigurableListableBeanFactory)</li>
</ul>
<p>Bean 工厂后置处理器构造器执行、PostProcessBeanFactory 方法执行：</p>
<ul>
<li>AbstractApplicationContext#refresh()</li>
<li>AbstractApplicationContext#invokeBeanFactoryPostProcessors(ConfigurableListableBeanFactory)</li>
</ul>
<p>Bean 后置处理器构造器执行：</p>
<ul>
<li>AbstractApplicationContext#refresh()</li>
<li>AbstractApplicationContext#registerBeanPostProcessors(ConfigurableListableBeanFactory)</li>
</ul>
<p>最后发现 Bean 对象创建的几个关键时机点代码层级的调用都在 <strong>AbstractApplicationContext</strong> 类的 <strong>refresh</strong> 方法中，可⻅这个方法对于 Spring IoC 容器初始化来说相当关键。</p>
<h2 id="Spring-IoC-容器初始化主流程"><a href="#Spring-IoC-容器初始化主流程" class="headerlink" title="Spring IoC 容器初始化主流程"></a>Spring IoC 容器初始化主流程</h2><p>由上分析可知，Spring IoC 容器初始化的关键环节就在 AbstractApplicationContext#refresh() 方法中 ，查看 refresh 方法来俯瞰容器创建的主体流程。</p>
<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></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">refresh</span><span class="params">()</span> <span class="keyword">throws</span> BeansException, IllegalStateException {</span><br><span class="line"> <span class="keyword">synchronized</span> (<span class="built_in">this</span>.startupShutdownMonitor) {</span><br><span class="line"> <span class="comment">// 第一步：刷新前的预处理</span></span><br><span class="line"> prepareRefresh();</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 第二步：获取 BeanFactory，默认实现是 DefaultListableBeanFactory</span></span><br><span class="line"> <span class="comment">// 加载 BeanDefinition 并注册到 BeanDefinitionRegistry</span></span><br><span class="line"> <span class="type">ConfigurableListableBeanFactory</span> <span class="variable">beanFactory</span> <span class="operator">=</span> obtainFreshBeanFactory();</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 第三步:BeanFactory 的预准备工作（BeanFactory 进行一些设置，比如 context 的类加载器等）</span></span><br><span class="line"> prepareBeanFactory(beanFactory);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> <span class="comment">// 第四步：BeanFactory 准备工作完成后进行的后置处理工作</span></span><br><span class="line"> postProcessBeanFactory(beanFactory);</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 第五步：实例化并调用实现了 BeanFactoryPostProcessor 接口的 Bean</span></span><br><span class="line"> invokeBeanFactoryPostProcessors(beanFactory);</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 第六步：注册 BeanPostProcessor（bean 的后置处理器），在创建 bean 的前后执行</span></span><br><span class="line"> registerBeanPostProcessors(beanFactory);</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 第七步：初始化 MessageSource 组件（做国际化功能、消息绑定、消息解析）</span></span><br><span class="line"> initMessageSource();</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 第八步：初始化事件派发器</span></span><br><span class="line"> initApplicationEventMulticaster();</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 第九步：子类重写这个方法，在容器刷新的时候可以自定义逻辑</span></span><br><span class="line"> onRefresh();</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 第十步：注册应用的监听器（注册实现了 ApplicationListener 接口的监听器 bean）</span></span><br><span class="line"> registerListeners();</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 第十一步：初始化所有剩下的非懒加载的单例 bean</span></span><br><span class="line"> <span class="comment">// 初始化创建非懒加载方式的单例 Bean 实例（未设置属性）</span></span><br><span class="line"> <span class="comment">// 设置属性</span></span><br><span class="line"> <span class="comment">// 初始化方法调用(比如调用 afterPropertiesSet 方法、init-method 方法)</span></span><br><span class="line"> <span class="comment">// 调用 BeanPostProcessor（后置处理器）对实例 bean 进行后置处</span></span><br><span class="line"> finishBeanFactoryInitialization(beanFactory);</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 第十二步：完成 context 的刷新。主要是调用 LifecycleProcessor的onRefresh() 方法，并且发布事件（ContextRefreshedEvent）</span></span><br><span class="line"> finishRefresh();</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><br><span class="line">}</span><br><span class="line"></span><br></pre></td></tr></table></figure>
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class="toc-number">1.</span> <span class="toc-text">Spring IoC容器初始化主体流程</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#Spring-IoC-%E7%9A%84%E5%AE%B9%E5%99%A8%E4%BD%93%E7%B3%BB"><span class="toc-number">1.1.</span> <span class="toc-text">Spring IoC 的容器体系</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#BeanFactory-%E9%A1%B6%E7%BA%A7%E6%8E%A5%E5%8F%A3%E6%96%B9%E6%B3%95%E6%A0%88"><span class="toc-number">1.1.1.</span> <span class="toc-text">BeanFactory 顶级接口方法栈</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#BeanFactory-%E5%AE%B9%E5%99%A8%E7%BB%A7%E6%89%BF%E4%BD%93%E7%B3%BB"><span class="toc-number">1.1.2.</span> <span class="toc-text">BeanFactory 容器继承体系</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#Bean-%E7%94%9F%E5%91%BD%E5%91%A8%E6%9C%9F%E5%85%B3%E9%94%AE%E6%97%B6%E6%9C%BA%E7%82%B9"><span class="toc-number">1.2.</span> <span class="toc-text">Bean 生命周期关键时机点</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#Spring-IoC-%E5%AE%B9%E5%99%A8%E5%88%9D%E5%A7%8B%E5%8C%96%E4%B8%BB%E6%B5%81%E7%A8%8B"><span class="toc-number">1.3.</span> <span class="toc-text">Spring IoC 容器初始化主流程</span></a></li></ol></li></ol></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/6e9746c4.html" title="CentOS 安装翰高数据库"><img src="https://s2.loli.net/2023/03/13/UucfkBIRYxCd7Tm.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="CentOS 安装翰高数据库"/></a><div class="content"><a class="title" href="/6e9746c4.html" title="CentOS 安装翰高数据库">CentOS 安装翰高数据库</a><time datetime="2023-03-13T08:08:54.000Z" title="发表于 2023-03-13 16:08:54">2023-03-13</time></div></div><div class="aside-list-item"><a class="thumbnail" href="/e56c5c4.html" 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