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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">实现一个简单的 AOP 功能</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="2022-05-18T06:31:51.000Z" title="发表于 2022-05-18 14:31:51">2022-05-18</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="2022-10-08T12:03:52.821Z" title="更新于 2022-10-08 20:03:52">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">248</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="实现一个简单的 AOP 功能"><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"><p>通过动态代理，将横切代码块与业务代码分离。</p>
<h1 id="JDK-动态代理方式"><a href="#JDK-动态代理方式" class="headerlink" title="JDK 动态代理方式"></a>JDK 动态代理方式</h1><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">TransactionProxyFactory</span><T> <span class="keyword">implements</span> <span class="title class_">InvocationHandler</span> {</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">final</span> T t;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">public</span> <span class="title function_">TransactionProxyFactory</span><span class="params">(T t)</span> {</span><br><span class="line"> <span class="built_in">this</span>.t = t;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">public</span> <E <span class="keyword">extends</span> <span class="title class_">T</span>> T <span class="title function_">getTarget</span><span class="params">()</span> {</span><br><span class="line"> <span class="keyword">return</span> (E) Proxy.newProxyInstance(t.getClass().getClassLoader(), t.getClass().getInterfaces(), <span class="built_in">this</span>);</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="keyword">public</span> Object <span class="title function_">invoke</span><span class="params">(Object proxy, Method method, Object[] args)</span> <span class="keyword">throws</span> Throwable {</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> TransactionManager.beginTransaction();</span><br><span class="line"></span><br><span class="line"> <span class="type">Object</span> <span class="variable">result</span> <span class="operator">=</span> method.invoke(t, args);</span><br><span class="line"></span><br><span class="line"> TransactionManager.commit();</span><br><span class="line"> <span class="keyword">return</span> result;</span><br><span class="line"> } <span class="keyword">catch</span> (Exception e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line"> TransactionManager.rollback();</span><br><span class="line"> <span class="keyword">throw</span> e;</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>
<h1 id="Cglib-动态代理方式"><a href="#Cglib-动态代理方式" class="headerlink" title="Cglib 动态代理方式"></a>Cglib 动态代理方式</h1><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">TransactionCglibProxyFactory</span><T> <span class="keyword">implements</span> <span class="title class_">MethodInterceptor</span> {</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">final</span> Class<? <span class="keyword">extends</span> <span class="title class_">T</span>> clazz;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">public</span> <span class="title function_">TransactionCglibProxyFactory</span><span class="params">(Class<? extends T> clazz)</span> {</span><br><span class="line"> <span class="built_in">this</span>.clazz = clazz;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">public</span> <E <span class="keyword">extends</span> <span class="title class_">T</span>> T <span class="title function_">getTarget</span><span class="params">()</span> {</span><br><span class="line"> <span class="type">Enhancer</span> <span class="variable">enhancer</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">Enhancer</span>();</span><br><span class="line"> enhancer.setSuperclass(clazz);</span><br><span class="line"> enhancer.setCallback(<span class="built_in">this</span>);</span><br><span class="line"> <span class="keyword">return</span> (E) enhancer.create();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="keyword">public</span> Object <span class="title function_">intercept</span><span class="params">(Object obj, Method method, Object[] args, MethodProxy proxy)</span> <span class="keyword">throws</span> Throwable {</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> TransactionManager.beginTransaction();</span><br><span class="line"></span><br><span class="line"> <span class="type">Object</span> <span class="variable">result</span> <span class="operator">=</span> proxy.invokeSuper(obj, args);</span><br><span class="line"></span><br><span class="line"> TransactionManager.commit();</span><br><span class="line"> <span class="keyword">return</span> result;</span><br><span class="line"> } <span class="keyword">catch</span> (Exception e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line"> TransactionManager.rollback();</span><br><span class="line"> <span class="keyword">throw</span> e;</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>
<h1 id="使用时调用代理对象"><a href="#使用时调用代理对象" class="headerlink" title="使用时调用代理对象"></a>使用时调用代理对象</h1><p>结合了之前写的 IoC 容器。</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></pre></td><td class="code"><pre><span class="line"><span class="keyword">private</span> <span class="keyword">final</span> <span class="type">TransferService</span> <span class="variable">transferService</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">TransactionProxyFactory</span><>(</span><br><span class="line"> (TransferService) BeanFactory.getBean(<span class="string">"transferService"</span>)).getTarget();</span><br><span class="line"></span><br></pre></td></tr></table></figure>
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