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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">BeanFactory 创建流程</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="2022-06-18T06:51:45.000Z" title="发表于 2022-06-18 14:51:45">2022-06-18</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" datetime="2022-10-08T12:04:00.641Z" title="更新于 2022-10-08 20:04:00">2022-10-08</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/Java-%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0/">Java 学习笔记</a><i class="fas fa-angle-right post-meta-separator"></i><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/Java-%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0/Spring-%E6%A1%86%E6%9E%B6/">Spring 框架</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">347</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>1分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title="BeanFactory 创建流程"><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="获取-BeanFactory-流程"><a href="#获取-BeanFactory-流程" class="headerlink" title="获取 BeanFactory 流程"></a>获取 BeanFactory 流程</h1><p>时序图<br><img src="https://s2.loli.net/2022/10/08/1TbhpYeOIfgsU3Q.png" alt="获取BeanFactory流程时序图"></p>
<h1 id="BeanDefinition-加载解析及注册子流程"><a href="#BeanDefinition-加载解析及注册子流程" class="headerlink" title="BeanDefinition 加载解析及注册子流程"></a>BeanDefinition 加载解析及注册子流程</h1><h2 id="该子流程涉及到如下几个关键步骤"><a href="#该子流程涉及到如下几个关键步骤" class="headerlink" title="该子流程涉及到如下几个关键步骤"></a>该子流程涉及到如下几个关键步骤</h2><ol>
<li><strong>Resource 定位</strong>：对 BeanDefinition 的资源定位过程，找到定义 JavaBean 信息的 XML文件，并将其封装成 Resource 对象。</li>
<li><strong>BeanDefinition 载入</strong>：把用户定义好的 JavaBean 表示为 IoC 容器内部的数据结构，这个容器内部的数据结构就是 BeanDefinition。</li>
<li><strong>注册 BeanDefinition 到 IoC 容器</strong></li>
</ol>
<h2 id="过程分析"><a href="#过程分析" class="headerlink" title="过程分析"></a>过程分析</h2><ol>
<li><p>子流程入口在 org.springframework.context.support.AbstractRefreshableApplicationContext#refreshBeanFactory 方法中。<br><img src="https://s2.loli.net/2022/10/08/G7iDhmfUaJPHWZv.png" alt="获取BeanFactory流程-过程分析"></p>
</li>
<li><p>依次调用多个类的 loadBeanDefinitions 方法 ->AbstractXmlApplicationContext -> AbstractBeanDefinitionReader -> XmlBeanDefinitionReader 一直执行到 XmlBeanDefinitionReader 的 doLoadBeanDefinitions 方法。</p>
</li>
<li><p>重点观察 XmlBeanDefinitionReader 类的 registerBeanDefinitions 方法，期间产生了多次重载调用，我们定位到最后一个。<br><img src="https://s2.loli.net/2022/10/08/LHjPBtvOfwSraz1.png"><br>此处关注两个地方：一个 createRederContext 方法，一个是 DefaultBeanDefinitionDocumentReader 类的 registerBeanDefinitions 方法。</p>
</li>
<li><p>先进入 createRederContext 方法看看。<br><img src="https://s2.loli.net/2022/10/08/q7sugefiJwCZNBP.png"><br>可以看到，此处 Spring 首先完成了 NamespaceHandlerResolver 的初始化。\</p>
</li>
<li><p>再进入 registerBeanDefinitions 方法中追踪，调用了 DefaultBeanDefinitionDocumentReader#registerBeanDefinitions 方法。<br><img src="https://s2.loli.net/2022/10/08/NjD4HBWMgX8xRur.png"><br>进入 doRegisterBeanDefinitions 方法<br><img src="https://s2.loli.net/2022/10/08/2yDKWJ1kiBmfE58.png"><br>进入 parseBeanDefinitions 方法<br><img src="https://s2.loli.net/2022/10/08/dU1EejZ2oNYycWP.png"><br>进入 parseDefaultElement 方法<br><img src="https://s2.loli.net/2022/10/08/fV1eDnLR2J7j4cG.png"><br>进入 processBeanDefinition 方法<br><img src="https://s2.loli.net/2022/10/08/g1zAZWV6iMfPeBt.png"></p>
</li>
<li><p>至此，注册流程结束，注册就是把封装的 XML 中定义的 Bean 信息封装为 BeanDefinition 对象之后放入一个 Map 中，BeanFactory 是以 Map 的结构组织这些 BeanDefinition 的。<br><img src="https://s2.loli.net/2022/10/08/5Tkz7qdwPIvr6YA.png"><br>可以在 DefaultListableBeanFactory 中看到此Map的定义。<br><img src="https://s2.loli.net/2022/10/08/Ub2i8AGJ3Pqd1pD.png"></p>
</li>
</ol>
<h2 id="BeanDefinition-加载解析及注册子流程时序图"><a href="#BeanDefinition-加载解析及注册子流程时序图" class="headerlink" title="BeanDefinition 加载解析及注册子流程时序图"></a>BeanDefinition 加载解析及注册子流程时序图</h2><p><img src="https://s2.loli.net/2022/10/08/kFyqmPfNLzuwTEx.png"></p>
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