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<meta property="og:description" content="实现一个简单 IoC 容器定义需要实例化对象的类的全限定类名以及类之间依赖关系的描述。 核心代码12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758public class BeanFactory &#123; private fi">
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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">实现一个简单 IoC 容器</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="2022-05-13T06:16:11.000Z" title="发表于 2022-05-13 14:16:11">2022-05-13</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="2022-10-08T12:03:51.052Z" title="更新于 2022-10-08 20:03:51">2022-10-08</time></span><span 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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="实现一个简单-IoC-容器"><a href="#实现一个简单-IoC-容器" class="headerlink" title="实现一个简单 IoC 容器"></a>实现一个简单 IoC 容器</h1><p>定义需要实例化对象的类的全限定类名以及类之间依赖关系的描述。</p>
<h2 id="核心代码"><a href="#核心代码" class="headerlink" title="核心代码"></a>核心代码</h2><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><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">BeanFactory</span> {</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">final</span> <span class="keyword">static</span> Map<String, Object> map = <span class="keyword">new</span> <span class="title class_">HashMap</span><>();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">static</span> {</span><br><span class="line"> <span class="type">InputStream</span> <span class="variable">resource</span> <span class="operator">=</span> Resource.getResourceAsStream(<span class="string">"beans.xml"</span>);</span><br><span class="line"> <span class="type">SAXReader</span> <span class="variable">saxReader</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">SAXReader</span>();</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> <span class="type">Document</span> <span class="variable">document</span> <span class="operator">=</span> saxReader.read(resource);</span><br><span class="line"> <span class="type">Element</span> <span class="variable">rootElement</span> <span class="operator">=</span> document.getRootElement();</span><br><span class="line"></span><br><span class="line"> List<Element> beanList = rootElement.selectNodes(<span class="string">"//bean"</span>);</span><br><span class="line"> <span class="keyword">for</span> (Element element : beanList) {</span><br><span class="line"> <span class="type">String</span> <span class="variable">id</span> <span class="operator">=</span> element.attributeValue(<span class="string">"id"</span>);</span><br><span class="line"> <span class="type">String</span> <span class="variable">clazz</span> <span class="operator">=</span> element.attributeValue(<span class="string">"class"</span>);</span><br><span class="line"></span><br><span class="line"> <span class="type">Object</span> <span class="variable">object</span> <span class="operator">=</span> newInstance(clazz);</span><br><span class="line"> map.put(id, object);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> List<Element> properties = rootElement.selectNodes(<span class="string">"//property"</span>);</span><br><span class="line"> <span class="keyword">for</span> (Element property : properties) {</span><br><span class="line"> <span class="type">String</span> <span class="variable">name</span> <span class="operator">=</span> property.attributeValue(<span class="string">"name"</span>);</span><br><span class="line"> <span class="type">String</span> <span class="variable">ref</span> <span class="operator">=</span> property.attributeValue(<span class="string">"ref"</span>);</span><br><span class="line"></span><br><span class="line"> <span class="comment">//父元素</span></span><br><span class="line"> <span class="type">Element</span> <span class="variable">parent</span> <span class="operator">=</span> property.getParent();</span><br><span class="line"> <span class="type">String</span> <span class="variable">id</span> <span class="operator">=</span> parent.attributeValue(<span class="string">"id"</span>);</span><br><span class="line"> <span class="type">Object</span> <span class="variable">parentBean</span> <span class="operator">=</span> getBean(id);</span><br><span class="line"> Method[] methods = parentBean.getClass().getDeclaredMethods();</span><br><span class="line"> <span class="keyword">for</span> (Method method : methods) {</span><br><span class="line"> <span class="keyword">if</span> ((<span class="string">"set"</span> + name).equalsIgnoreCase(method.getName())) {</span><br><span class="line"> <span class="comment">//给父元素的成员变量赋值</span></span><br><span class="line"> <span class="type">Object</span> <span class="variable">bean</span> <span class="operator">=</span> getBean(ref);</span><br><span class="line"> method.invoke(parentBean, bean);</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> map.put(id, parentBean);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> } <span class="keyword">catch</span> (DocumentException | ClassNotFoundException | NoSuchMethodException | InvocationTargetException |</span><br><span class="line"> InstantiationException | IllegalAccessException e) {</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> <span class="title class_">RuntimeException</span>(e);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">static</span> Object <span class="title function_">newInstance</span><span class="params">(String clazz)</span> <span class="keyword">throws</span> ClassNotFoundException, NoSuchMethodException, InstantiationException, IllegalAccessException, InvocationTargetException {</span><br><span class="line"> Class<?> aClass = Class.forName(clazz);</span><br><span class="line"> Constructor<?> constructor = aClass.getDeclaredConstructor();</span><br><span class="line"> <span class="keyword">return</span> constructor.newInstance();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> <T> T <span class="title function_">getBean</span><span class="params">(String id)</span> {</span><br><span class="line"> <span class="keyword">return</span> (T) map.get(id);</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<h2 id="XML-测试文件"><a href="#XML-测试文件" class="headerlink" title="XML 测试文件"></a>XML 测试文件</h2><figure class="highlight xml"><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></pre></td><td class="code"><pre><span class="line"><span class="meta"><?xml version=<span class="string">"1.0"</span> encoding=<span class="string">"utf-8"</span> ?></span></span><br><span class="line"></span><br><span class="line"><span class="tag"><<span class="name">beans</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">bean</span> <span class="attr">id</span>=<span class="string">"accountDao"</span> <span class="attr">class</span>=<span class="string">"com.lagou.edu.dao.impl.JdbcAccountDaoImpl"</span>></span><span class="tag"></<span class="name">bean</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">bean</span> <span class="attr">id</span>=<span class="string">"transferService"</span> <span class="attr">class</span>=<span class="string">"com.lagou.edu.service.impl.TransferServiceImpl"</span>></span></span><br><span class="line"> <span class="comment"><!--set+name找到set方法，传入参数ref--></span></span><br><span class="line"> <span class="tag"><<span class="name">property</span> <span class="attr">name</span>=<span class="string">"AccountDao"</span> <span class="attr">ref</span>=<span class="string">"accountDao"</span>></span><span class="tag"></<span class="name">property</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">bean</span>></span></span><br><span class="line"><span class="tag"></<span class="name">beans</span>></span></span><br></pre></td></tr></table></figure>
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