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Java三种代理模式.html
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<p><font size="4" color="red">一、静态代理</font><br>静态代理通常用于对原有程序进行功能扩充，在编译的时候就将接口、实现类、代理类都手动完成。</p>
<p>简单例子：<br>接口：</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">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">UserDao</span> </span>{</span><br><span class="line"> <span class="function"><span class="keyword">void</span> <span class="title">save</span><span class="params">()</span></span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>实现类：</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></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">UserImpl</span> <span class="keyword">implements</span> <span class="title">UserDao</span> </span>{</span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">save</span><span class="params">()</span> </span>{</span><br><span class="line"> System.out.println(<span class="string">"保存"</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<a id="more"></a>
<p>代理类：</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></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">ProxyClass</span> <span class="keyword">implements</span> <span class="title">UserDao</span> </span>{</span><br><span class="line"> <span class="keyword">private</span> UserImpl user;</span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">ProxyClass</span><span class="params">(UserImpl user)</span></span>{</span><br><span class="line"> <span class="keyword">this</span>.user = user;</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="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">save</span><span class="params">()</span> </span>{</span><br><span class="line"> System.out.println(<span class="string">"开启事务"</span>);</span><br><span class="line"> user.save();</span><br><span class="line"> System.out.println(<span class="string">"提交事务"</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>测试：</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></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Main</span> </span>{</span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> <span class="keyword">throws</span> ClassNotFoundException, NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException </span>{</span><br><span class="line"> UserDao user = <span class="keyword">new</span> UserImpl();</span><br><span class="line"> ProxyClass proxyClass = <span class="keyword">new</span> ProxyClass(user);</span><br><span class="line"> proxyClass.save();</span><br><span class="line"> }</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">打印结果：</span></span><br><span class="line"><span class="comment">开启事务</span></span><br><span class="line"><span class="comment">保存</span></span><br><span class="line"><span class="comment">提交事务</span></span><br><span class="line"><span class="comment">*/</span></span><br></pre></td></tr></table></figure>
<p>可以看到，代理类和被代理类要实现同一个接口，这会产生多余的接口实现，而且当接口增多之后，静态代理就会变得很困难，会显得很臃肿；除此之外，当接口增加方法之后，代理类和被代理类都要进行修改，这不是我们想要的，因此，静态代理从某种程度上来说不够好。</p>
<p><font size="4" color="red">二、动态代理</font><br>当我们需要很多代理的时候，如果每一个都是手动去实现，岂不是太难受了，浪费了大量的时间不说，还产生很多冗余代码，此时，动态代理就是一个比较好的选择了。<br>动态代理，又被称为JDK代理，底层是反射，只在需要代理的地方才会加载，不会再编译期生成.class文件，动态代理要求目标对象必须实现接口，但是代理对象不必实现接口。<br>动态代理必须用到的JDK API有一个类 java.lang.reflect Proxy，和一个接口 java.lang.reflect InvocationHandler，InvocationHandler接口中只有一个invoke方法(JDK1.8)，如下</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> Object <span class="title">invoke</span><span class="params">(Object proxy, Method method, Object[] args)</span> <span class="comment">//参数含义分别为代理实例、调用的方法、方法的参数列表</span></span></span><br><span class="line"><span class="function"> <span class="keyword">throws</span> Throwable</span>;</span><br></pre></td></tr></table></figure>
<p>InvocationHandler接口的invoke方法用于处理方法调用并返回结果。</p>
<p>而Proxy类主要动到的是这个静态方法</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></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">static</span> Object <span class="title">newProxyInstance</span><span class="params">(ClassLoader loader, //类加载器</span></span></span><br><span class="line"><span class="function"><span class="params"> Class<?>[] interfaces, //目标对象实现的接口</span></span></span><br><span class="line"><span class="function"><span class="params"> InvocationHandler h)</span> </span></span><br><span class="line"><span class="function"> <span class="keyword">throws</span> IllegalArgumentException</span></span><br></pre></td></tr></table></figure>
<p>看下动态代理的demo<br>接口类<br><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">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">UserDao</span> </span>{</span><br><span class="line"> <span class="function"><span class="keyword">void</span> <span class="title">save</span><span class="params">()</span></span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>目标对象类</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></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">UserDaoImpl</span> <span class="keyword">implements</span> <span class="title">UserDao</span> </span>{</span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">save</span><span class="params">()</span> </span>{</span><br><span class="line"> System.out.println(<span class="string">"保存"</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>代理对象类</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></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">ProxyClass</span> </span>{</span><br><span class="line"> <span class="keyword">private</span> Object target;</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">ProxyClass</span><span class="params">(Object target)</span></span>{</span><br><span class="line"> <span class="keyword">this</span>.target = target;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Object <span class="title">getProxyInstance</span><span class="params">()</span></span>{</span><br><span class="line"> <span class="keyword">return</span> Proxy.newProxyInstance(target.getClass().getClassLoader(), target.getClass().getInterfaces(), <span class="keyword">new</span> InvocationHandler() {</span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Object <span class="title">invoke</span><span class="params">(Object proxy, Method method, Object[] args)</span> <span class="keyword">throws</span> Throwable </span>{</span><br><span class="line"> System.out.println(<span class="string">"开启事务"</span>);</span><br><span class="line"> Object o = method.invoke(target,args);</span><br><span class="line"> System.out.println(<span class="string">"关闭事务"</span>);</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">null</span>;</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>
<p>测试</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></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Main</span> </span>{</span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span></span>{</span><br><span class="line"> UserDao userDao = <span class="keyword">new</span> UserDaoImpl(); <span class="comment">//多态，向上转型</span></span><br><span class="line"> UserDao userDao1 = (UserDao) <span class="keyword">new</span> ProxyClass(userDao).getProxyInstance();</span><br><span class="line"> userDao1.save();</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p><strong>动态代理实现过程：</strong><br>因为通过使用接口指向实现类的实例的多态实现方式，可以有效的将具体的实现与调用之间解耦，便于后期修改与维护。具体的说就是我们在代理类中创建一个私有成员变量（private修饰），使用接口来指向实现类的对象，然后在该代理类中的方法中使用这个创建的实例来调用实现类中的相应方法来完成业务逻辑功能。</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></pre></td><td class="code"><pre><span class="line"><span class="keyword">private</span> Object target;</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">ProxyClass</span><span class="params">(Object target)</span></span>{</span><br><span class="line"> <span class="keyword">this</span>.target = target;</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
<p>上面代码通过这个构造器可以创建代理类的实例，创建的同时还能将具体实现类的实例与之绑定（target指的就是实现类的实例，这个实例需要在测试类中创建并作为参数来创建代理类的实例）。</p>
<p>静态代理中我们测试类中直接创建代理类的对象，使用代理类的对象来调用其方法即可，若是别的接口（这里指的是别的调用方）要调用Iuser的方法，也可以使用此法<br>动态代理中要复杂的多，首先我们要将之前提到的实现类的实例创建（补充完整），然后利用这个实例作为参数，调用代理来的带参构造器来创建“代理类实例对象”，这里加引号的原因是因为它并不是真正的代理类的实例对象，而是创建真正代理类实例的一个参数，这个实现了InvocationHandler接口的类严格意义上来说并不是代理类，我们可以将其看作是创建代理类的必备中间环节，这是一个调用处理器，也就是处理方法调用的一个类，不是真正意义上的代理类，可以这么说：创建一个方法调用处理器实例。<br> 下面才是真正的代理类实例的创建，之前创建的”代理类实例对象“仅仅是一个参数<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">UserDao userDao1 = (UserDao) <span class="keyword">new</span> ProxyClass(userDao).getProxyInstance();</span><br></pre></td></tr></table></figure></p>
<p><font color="red" size="4">三、cglib代理</font><br>JDK代理在某种程度上来说已经足够完美了，但是它仍有不足之处就是面向接口编程，如果为了实现代理而为每个需要代理的类创建一个毫无意义的接口是很烦的，也是没必要的，于是就产生了cglib代理。cglib代理不必面向接口，在Spring AOP就使用了cglib代理。<br>CGLIB是一个强大的高性能的代码生成包，它可以在运行期扩展Java类与实现Java接口。CGLIB包的底层是通过使用一个小而快的字节码处理框架ASM，来转换字节码并生成新的类。CGLIB代理真正的达到了代理类无侵入。<br>使用cglib代理之前别忘了引入jar包或者maven依赖。<br>UserDao<br><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">UserDao</span></span>{</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">save</span><span class="params">()</span> </span>{</span><br><span class="line"> System.out.println(<span class="string">"保存"</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></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></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> java.lang.reflect.Method;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> net.sf.cglib.proxy.Enhancer;</span><br><span class="line"><span class="keyword">import</span> net.sf.cglib.proxy.MethodInterceptor;</span><br><span class="line"><span class="keyword">import</span> net.sf.cglib.proxy.MethodProxy;</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">ProxyFactory</span> <span class="keyword">implements</span> <span class="title">MethodInterceptor</span></span>{</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> Object target;<span class="comment">//维护一个目标对象</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">ProxyFactory</span><span class="params">(Object target)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.target = target;</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> <span class="comment">//为目标对象生成代理对象</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Object <span class="title">getProxyInstance</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="comment">//工具类</span></span><br><span class="line"> Enhancer en = <span class="keyword">new</span> Enhancer();</span><br><span class="line"> <span class="comment">//设置父类</span></span><br><span class="line"> en.setSuperclass(target.getClass());</span><br><span class="line"> <span class="comment">//设置回调函数</span></span><br><span class="line"> en.setCallback(<span class="keyword">this</span>);</span><br><span class="line"> <span class="comment">//创建子类对象代理</span></span><br><span class="line"> <span class="keyword">return</span> en.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="function"><span class="keyword">public</span> Object <span class="title">intercept</span><span class="params">(Object obj, Method method, Object[] args, MethodProxy proxy)</span> <span class="keyword">throws</span> Throwable </span>{</span><br><span class="line"> System.out.println(<span class="string">"开启事务"</span>);</span><br><span class="line"> <span class="comment">// 执行目标对象的方法</span></span><br><span class="line"> Object returnValue = method.invoke(target, args);</span><br><span class="line"> System.out.println(<span class="string">"关闭事务"</span>);</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">null</span>;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>测试</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></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">TestProxy</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Test</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">testCglibProxy</span><span class="params">()</span></span>{</span><br><span class="line"> <span class="comment">//目标对象</span></span><br><span class="line"> UserDao target = <span class="keyword">new</span> UserDao();</span><br><span class="line"> <span class="comment">//代理对象</span></span><br><span class="line"> UserDao proxy = (UserDao) <span class="keyword">new</span> ProxyFactory(target).getProxyInstance();</span><br><span class="line"> <span class="comment">//执行代理对象方法</span></span><br><span class="line"> proxy.save();</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">结果：</span></span><br><span class="line"><span class="comment">开启事务</span></span><br><span class="line"><span class="comment">保存数据</span></span><br><span class="line"><span class="comment">关闭事务</span></span><br><span class="line"><span class="comment">*/</span></span><br></pre></td></tr></table></figure>
<p><strong>注意：</strong><br>cglib代理无需实现接口，通过生成类字节码实现代理，比反射稍快，不存在性能问题。通过代码实例我们是可以看出一点，其实在编码上，cglib动态代理和JDK动态代理的编码逻辑类似，都是实现一个接口，再使用另外一个提供的类来创建代理实例。<br>参考文章：<a href="https://segmentfault.com/a/1190000011291179" target="_blank" rel="noopener">Java三种代理模式</a>；<a href="https://www.cnblogs.com/V1haoge/p/5860749.html" target="_blank" rel="noopener">java静态代理与动态代理简单分析</a></p>
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<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">Redisson集群分布式锁</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">SSM</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color1">synchromized关键字</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">散列表</a>
</li>
<div class="clearfix"></div>
</ul>
</div>
<ul class="search-ul">
<p q-show="jsonFail" style="padding: 20px; font-size: 12px;">
缺失模块。<br>1、请确保node版本大于6.2<br>2、在博客根目录（注意不是yilia根目录）执行以下命令：<br> npm i hexo-generator-json-content --save<br><br>
3、在根目录_config.yml里添加配置：
<pre style="font-size: 12px;" q-show="jsonFail">
jsonContent:
meta: false
pages: false
posts:
title: true
date: true
path: true
text: false
raw: false
content: false
slug: false
updated: false
comments: false
link: false
permalink: false
excerpt: false
categories: false
tags: true
</pre>
</p>
<li class="search-li" q-repeat="items" q-show="isShow">
<a q-attr="href:path|urlformat" class="search-title"><i class="icon-quo-left icon"></i><span q-text="title"></span></a>
<p class="search-time">
<i class="icon-calendar icon"></i>
<span q-text="date|dateformat"></span>
</p>
<p class="search-tag">
<i class="icon-price-tags icon"></i>
<span q-repeat="tags" q-on="click:choseTag(e, name)" q-text="name|tagformat"></span>
</p>
</li>
</ul>
</section>
<section class="tools-section tools-section-friends" q-show="friends">
<ul class="search-ul">
<li class="search-li">
<a href="https://blog.csdn.net/qq_43060759/article/category/8223649" target="_blank" class="search-title"><i class="icon-quo-left icon"></i>CSDN</a>
</li>
<li class="search-li">
<a href="https://www.cnblogs.com/" target="_blank" class="search-title"><i class="icon-quo-left icon"></i>博客园</a>
</li>
<li class="search-li">
<a href="http://qzmvc1.top/" target="_blank" class="search-title"><i class="icon-quo-left icon"></i>Qzmvc1</a>
</li>
<li class="search-li">
<a href="https://szd0319.github.io/" target="_blank" class="search-title"><i class="icon-quo-left icon"></i>宋振栋</a>
</li>
</ul>
</section>
<section class="tools-section tools-section-me" q-show="aboutme">
<div class="aboutme-wrap" id="js-aboutme">知我者谓我心忧，不知我者谓我何求</div>
</section>
</div>
</div>
<!-- Root element of PhotoSwipe. Must have class pswp. -->
<div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">
<!-- Background of PhotoSwipe.
It's a separate element as animating opacity is faster than rgba(). -->
<div class="pswp__bg"></div>
<!-- Slides wrapper with overflow:hidden. -->
<div class="pswp__scroll-wrap">
<!-- Container that holds slides.
PhotoSwipe keeps only 3 of them in the DOM to save memory.
Don't modify these 3 pswp__item elements, data is added later on. -->
<div class="pswp__container">
<div class="pswp__item"></div>
<div class="pswp__item"></div>
<div class="pswp__item"></div>
</div>
<!-- Default (PhotoSwipeUI_Default) interface on top of sliding area. Can be changed. -->
<div class="pswp__ui pswp__ui--hidden">
<div class="pswp__top-bar">
<!-- Controls are self-explanatory. Order can be changed. -->
<div class="pswp__counter"></div>
<button class="pswp__button pswp__button--close" title="Close (Esc)"></button>
<button class="pswp__button pswp__button--share" style="display:none" title="Share"></button>
<button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>
<button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>
<!-- Preloader demo http://codepen.io/dimsemenov/pen/yyBWoR -->
<!-- element will get class pswp__preloader--active when preloader is running -->
<div class="pswp__preloader">
<div class="pswp__preloader__icn">
<div class="pswp__preloader__cut">
<div class="pswp__preloader__donut"></div>
</div>
</div>
</div>
</div>
<div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
<div class="pswp__share-tooltip"></div>
</div>
<button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)">
</button>
<button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
</button>
<div class="pswp__caption">
<div class="pswp__caption__center"></div>
</div>
</div>
</div>
</div>
</div>
</body>
</html>