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<article id="post-在Java11下调用jdk-internal-misc-Unsafe的方式" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<header class="article-header">
<h1 itemprop="name">
<a class="article-title" href="/2020/07/04/在Java11下调用jdk-internal-misc-Unsafe的方式/">在Java11下调用jdk.internal.misc.Unsafe的方式</a>
</h1>
<a href="/2020/07/04/在Java11下调用jdk-internal-misc-Unsafe的方式/" class="archive-article-date">
<time datetime="2020-07-03T16:45:40.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2020-07-04</time>
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<h2 id="Java11的模块化"><a href="#Java11的模块化" class="headerlink" title="Java11的模块化"></a>Java11的模块化</h2><p>Java9引入了的模块化相关的内容，将JDK的jar总共分为了module，将之前的Class和Class之间的依赖简化为module和module之间的依赖。每个模块由一个叫module-info.java的文件说明引入和导出相关的API。<strong>未导出的API无法在其他模块内被使用</strong>。</p>
<p>只有手动在module-info.java内声明，才可以被调用，并且只能声明那些已经导出的模块 。而jdk为了安全考虑，并<strong>没有导出jdk.internal.misc.Unsafe</strong>。</p>
<h2 id="Unsafe类"><a href="#Unsafe类" class="headerlink" title="Unsafe类"></a>Unsafe类</h2><pre><code>Jdk中的Unsafe类有两个分别是 sun.misc.Unsafe和 jdk.internal.misc.Unsafe。
</code></pre><p> <strong>sun.misc.Unsafe</strong>：该类是对 jdk.internal.misc.Unsafe再封装，开放了一些不那么’unsafe’的API。</p>
<p> <strong>jdk.internal.misc.Unsafe</strong>，该类并未导出，甚至无法import。</p>
<p> sun.misc.Unsafe实例可以通过反射拿到其单例对象，可以直接进行方法调用。<br> 但是jdk.internal.misc.Unsafe拿到实例后也无法正常用。因为无法import；想要调用只能通过反射，但是反射调用又需要进行权限检查，这看起来似乎无解。但是jdk依旧给我们留了一个口子: <strong>sun.misc.Unsafe类进行属性设置的时候是无视权限检查的</strong>；这时候我们可以分析反射调用时权限检查相关的代码，进行绕过。</p>
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<a class="article-more-a" href="/2020/07/04/在Java11下调用jdk-internal-misc-Unsafe的方式/">展开全文 >></a>
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<article id="post-关于策略模式一些思考" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2020/06/30/关于策略模式一些思考/">关于策略模式一些思考</a>
</h1>
<a href="/2020/06/30/关于策略模式一些思考/" class="archive-article-date">
<time datetime="2020-06-30T13:13:47.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2020-06-30</time>
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<p>本篇文章来源于和球哥吹牛逼的总结。</p>
<h2 id="原因"><a href="#原因" class="headerlink" title="原因"></a>原因</h2><p>前两天我在开开心心地当个死宅，球哥突然甩给我一个链接，说这篇文章的策略模式实现是不是有问题。</p>
<p>链接里面的策略模式是这么写的：</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="comment">/**</span></span><br><span class="line"><span class="comment"> * 以下只有核心代码</span></span><br><span class="line"><span class="comment"> * ChargeEnum为策略类型</span></span><br><span class="line"><span class="comment"> * ChargeStrategy策略接口</span></span><br><span class="line"><span class="comment"> * StrategyFactory策略工厂</span></span><br><span class="line"><span class="comment"> * Context运行时上下文</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">enum</span> ChargeEnum {</span><br><span class="line"> CARD, ACCOUNT, PHONE</span><br><span class="line">}</span><br><span class="line"><span class="class"><span class="keyword">interface</span> <span class="title">ChargeStrategy</span> </span>{</span><br><span class="line"> <span class="function"><span class="keyword">double</span> <span class="title">charge</span><span class="params">(<span class="keyword">double</span> num, ChargeEnum e)</span></span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<article id="post-Callable实现原理浅析" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2020/06/26/Callable实现原理浅析/">Callable实现原理浅析</a>
</h1>
<a href="/2020/06/26/Callable实现原理浅析/" class="archive-article-date">
<time datetime="2020-06-25T16:13:02.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2020-06-26</time>
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<h2 id="一、实现线程的方式"><a href="#一、实现线程的方式" class="headerlink" title="一、实现线程的方式"></a>一、实现线程的方式</h2><p>JSR133中规定到：</p>
<blockquote>
<p>Threads are represented by the <code>Thread</code> class. The only way for a user to create a thread is to create an object of this class; each thread is associated with such an object. A thread will start when the <code>start()</code> method is invoked on the corresponding <code>Thread</code> object.</p>
</blockquote>
<p>翻译过来就是：</p>
<blockquote>
<p>线程是用 Thread 类来表示的。用户创建一个线程 的唯一方式是创建一个该类的对象；每个线程都与这样一个对象相关联。在对应的 Thread 对象上调用 start()方法将启动线程。</p>
</blockquote>
<p>所以说，<strong>创建线程的唯一方式只有new Thread()</strong>，线程在调用<strong>Thread#start()</strong>方法后启动。</p>
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<a class="article-title" href="/2020/06/23/搭建自己的git服务器/">搭建自己的git服务器</a>
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<h2 id="写在前面"><a href="#写在前面" class="headerlink" title="写在前面"></a>写在前面</h2><p>打算重新开始写博客，直接用现成的Hexo。Hexo教程一般使用Github作为默认的服务器，但是我想推送到自己的服务器上，所以打算自己搭建一个博客仓库。</p>
<h2 id="具体步骤"><a href="#具体步骤" class="headerlink" title="具体步骤"></a>具体步骤</h2><p>Linux, Linux需要安装git, 本地安装git</p>
<h2 id="采用RSA认证"><a href="#采用RSA认证" class="headerlink" title="采用RSA认证"></a>采用RSA认证</h2><p>常见的RSA git 链接一般都是：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">[email protected]:xxx.git</span><br></pre></td></tr></table></figure>
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<article id="post-基本类型的++操作原理" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2019/08/30/基本类型的++操作原理/">基本类型的++操作原理</a>
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<p>对于所有基本类型的++操作源代码如下：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><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></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">int</span> <span class="title">test</span><span class="params">()</span></span>{</span><br><span class="line"> <span class="keyword">byte</span> a = <span class="number">1</span>;</span><br><span class="line"> a++;</span><br><span class="line"> <span class="keyword">char</span> b = <span class="number">1</span>;</span><br><span class="line"> b++;</span><br><span class="line"> <span class="keyword">short</span> c = <span class="number">1</span>;</span><br><span class="line"> c++;</span><br><span class="line"> <span class="keyword">int</span> d = <span class="number">1</span>;</span><br><span class="line"> d++;</span><br><span class="line"> <span class="keyword">long</span> e = <span class="number">1</span>;</span><br><span class="line"> e++;</span><br><span class="line"> <span class="keyword">float</span> f = <span class="number">1</span>;</span><br><span class="line"> f++;</span><br><span class="line"> <span class="keyword">double</span> g = <span class="number">1</span>;</span><br><span class="line"> g++;</span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<article id="post-从字节码看i=i++和i=++i" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<h4 id="对于i"><a href="#对于i" class="headerlink" title="对于i++"></a>对于i++</h4><p>源码：</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="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">plus</span><span class="params">()</span></span>{</span><br><span class="line"> <span class="keyword">int</span> i=<span class="number">0</span>;</span><br><span class="line"> i=i++;</span><br><span class="line"> <span class="keyword">return</span> i;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>字节码：</p>
<figure class="highlight plain"><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">public int test();</span><br><span class="line"> Code:</span><br><span class="line"> 0: iconst_1 //int类型 1 放入栈顶</span><br><span class="line"> 1: istore_1 //栈顶int类型数值放入局部变量表第二个位置 </span><br><span class="line"> 2: iload_1 //将局部变量表第二个位置数据放入栈顶</span><br><span class="line"> 3: iinc 1, 1 //将局部变量表第二个位置的元素+1</span><br><span class="line"> 6: istore_1 //将栈顶元素放入局部变量表第二个位置</span><br><span class="line"> 7: iload_1 //将局部变量表第二个位置的值放入栈顶</span><br><span class="line"> 8: ireturn //将栈顶元素返回</span><br></pre></td></tr></table></figure>
<p>注：局部变量表的第一个位置留给this</p>
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<article id="post-java逆向总结" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2019/08/23/java逆向总结/">java逆向总结</a>
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<p>毕竟是第一次进行逆向，过程中有许多乱七八糟的，也走了很多弯路，不过说到底还是学习了一些东西的；</p>
<p>比如逆向的时候要搞清楚函数的返回值啊，调用链啊，这地方可能就需要AspectJ了，然后获取到返回值之后，还要对代码进行具体的分析，方法返回什么值？，这地方可能就要顺着作者的思路了。</p>
<p>还有就是修改字节码的时候，有些能比较清晰地看到类方法的基本上可以用javasisst直接插入方法体就行了，但是如果没办法反编译的话只能用ASM把字节码修改了；也可以javassist组合起来用，比如用javassist给类加个打印异常日志的方法write，然后利用ASM在捕获到异常的时候把异常用write(Exception)打印到文件里，这样就可以更好分析插件了。</p>
<p>ZKM混淆之后的字节码基本上都是a,b,c,d啥的，所有的字符串也变成了</p>
<figure class="highlight plain"><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">//加密方法</span><br><span class="line">a(int,int);</span><br><span class="line">//或者字符串数组</span><br><span class="line">static final String[] a;</span><br></pre></td></tr></table></figure>
<p>看得脑仁疼；</p>
<p>反编译也用了cfr,jad，jbytemod之类的工具；</p>
<p>但对于没办法反编译到java代码的只能硬生生地看字节码了；</p>
<p>刚好也更熟悉了字节码的一些指令，之前就只大概知道字节码怎么看，像异常表之类的就不熟很熟悉，还有本地变量表也是；</p>
<p>总的来说还是对自己有些提高的把，虽然也花了一些时间。但至少明白了字节码，切面代理之类的东西。</p>
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<article id="post-Java逆向记录（三），ASM的使用" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<h4 id="分析"><a href="#分析" class="headerlink" title="分析"></a>分析</h4><p>之前的招不太管用，然后只能从字节码下手，分析之后字符串混淆的字节码基本是</p>
<figure class="highlight plain"><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">SIPUSH xxxx</span><br><span class="line">SIPUSH xxxx</span><br><span class="line">INVOKESTATIC a(int,int)String;</span><br></pre></td></tr></table></figure>
<p>这种形式，于是打算使用ASM修改字节码，将这一段改成具体的字符串入栈，即：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">LDC "xxxxxx"</span><br></pre></td></tr></table></figure>
<p>修改字节码时，并没有使用原始的ClassVisitor和MethodVisitor，而是使用ClassNode和MethodNode，以迭代器的形式进行遍历：</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></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">test</span><span class="params">(String className)</span> <span class="keyword">throws</span> Exception </span>{</span><br><span class="line"> ClassReader reader = <span class="keyword">new</span> ClassReader(className);</span><br><span class="line"> ClassNode classNode = <span class="keyword">new</span> ClassNode();</span><br><span class="line"> reader.accept(classNode, ClassReader.EXPAND_FRAMES);</span><br><span class="line"> <span class="keyword">final</span> List<MethodNode> methods = classNode.methods;</span><br><span class="line"> <span class="keyword">for</span> (MethodNode methodNode : methods) {</span><br><span class="line"> <span class="keyword">final</span> ListIterator<AbstractInsnNode> iterator = methodNode.instructions.iterator();</span><br><span class="line"> <span class="keyword">while</span> (iterator.hasNext()) {</span><br><span class="line"> <span class="keyword">final</span> AbstractInsnNode sipush1 = iterator.next();</span><br><span class="line"> <span class="keyword">if</span> (sipush1 <span class="keyword">instanceof</span> IntInsnNode) {</span><br><span class="line"> <span class="comment">//这地方主要是判断字节是否是SIPUSH,SIPUSH,INVOKESTATIC的形式</span></span><br><span class="line"> <span class="keyword">if</span> (sipush1.getOpcode() == SIPUSH && iterator.hasNext()) {</span><br><span class="line"> <span class="keyword">final</span> AbstractInsnNode siPush2 = sipush1.getNext();</span><br><span class="line"> <span class="keyword">final</span> AbstractInsnNode invokeStatic = siPush2.getNext();</span><br><span class="line"> <span class="keyword">if</span> (sipush1.getOpcode() == siPush2.getOpcode() &&</span><br><span class="line"> invokeStatic.getOpcode() == INVOKESTATIC) {</span><br><span class="line"> <span class="keyword">int</span> v1 = ((IntInsnNode) sipush1).operand;</span><br><span class="line"> <span class="keyword">int</span> v2 = ((IntInsnNode) siPush2).operand;</span><br><span class="line"> <span class="keyword">final</span> String value1 = getValue(className, v1, v2);</span><br><span class="line"> <span class="keyword">if</span> (value1 == <span class="keyword">null</span>) {</span><br><span class="line"> <span class="keyword">continue</span>;</span><br><span class="line"> }</span><br><span class="line"> System.out.println(<span class="string">" do replace... ["</span> + value1 + <span class="string">"] in "</span> + className);</span><br><span class="line"> iterator.remove();</span><br><span class="line"> iterator.next();</span><br><span class="line"> iterator.remove();</span><br><span class="line"> iterator.next();</span><br><span class="line"> iterator.set(<span class="keyword">new</span> LdcInsnNode(value1));</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"> ClassWriter writer = <span class="keyword">new</span> ClassWriter(ClassWriter.COMPUTE_FRAMES);</span><br><span class="line"> classNode.accept(writer);</span><br><span class="line"> <span class="keyword">final</span> <span class="keyword">byte</span>[] bytes1 = writer.toByteArray();</span><br><span class="line"> <span class="comment">//write to file ....</span></span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h4 id="遇到的坑"><a href="#遇到的坑" class="headerlink" title="遇到的坑"></a>遇到的坑</h4><p>其中遇到的坑大概是设置ASM修改级别的时候，使用ASM5级别的时候会导致修改lambda报错。</p>
<p>还有就是设置ClassReader的<strong>ClassReader.EXPAND_FRAMES</strong> 和ClassWriter的<strong>ClassWriter.COMPUTE_FRAMES</strong>，搞不好会搞混了。</p>
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<article id="post-Java逆向记录（二），Javassist的使用" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2019/08/23/Java逆向记录（二），Javassist的使用/">Java逆向记录（二），Javassist的使用</a>
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<a href="/2019/08/23/Java逆向记录（二），Javassist的使用/" class="archive-article-date">
<time datetime="2019-08-23T04:04:27.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2019-08-23</time>
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<h4 id="思路：修改目标代码"><a href="#思路：修改目标代码" class="headerlink" title="思路：修改目标代码"></a>思路：修改目标代码</h4><p>在分析了字符串之后，找到了一些关键字符串，比如验证，发送激活请求后的代表激活信息的JsonObject，随后用javassist进行修改</p>
<figure class="highlight groovy"><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="comment">//gradle/maven 引入依赖</span></span><br><span class="line">compile <span class="string">group:</span> <span class="string">'org.javassist'</span>, <span class="string">name:</span> <span class="string">'javassist'</span>, <span class="string">version:</span> <span class="string">'3.25.0-GA'</span></span><br></pre></td></tr></table></figure>
<h4 id="具体代码"><a href="#具体代码" class="headerlink" title="具体代码"></a>具体代码</h4><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></pre></td><td class="code"><pre><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">modify</span><span class="params">()</span> <span class="keyword">throws</span> NotFoundException, CannotCompileException, IOException </span>{</span><br><span class="line"> <span class="keyword">final</span> ClassPool pool = ClassPool.getDefault();</span><br><span class="line"> <span class="keyword">final</span> CtClass ctClass = pool.get(<span class="string">"要修改的类"</span>);</span><br><span class="line"> <span class="comment">//需要修改的方法</span></span><br><span class="line"> <span class="keyword">final</span> CtMethod d = ctClass.getDeclaredMethods(<span class="string">"d"</span>)[<span class="number">1</span>];</span><br><span class="line"> <span class="keyword">final</span> CtMethod a = ctClass.getDeclaredMethods(<span class="string">"a"</span>)[<span class="number">2</span>];</span><br><span class="line"> <span class="keyword">final</span> CtMethod b = ctClass.getDeclaredMethods(<span class="string">"b"</span>)[<span class="number">2</span>];</span><br><span class="line"> <span class="comment">//方法体写在 {} 内部，其中，类需要写全限定名，即：Date类需要写java.util.Date</span></span><br><span class="line"> d.setBody(</span><br><span class="line"> <span class="string">"{\n"</span> +</span><br><span class="line"> <span class="string">" Response res = new Response();\n"</span> +</span><br><span class="line"> <span class="string">" res.setValid(Boolean.valueOf(true));\n"</span> +</span><br><span class="line"> <span class="string">" res.setEncrptString(\"3.1415926\");\n"</span> +</span><br><span class="line"> <span class="string">" return res;\n"</span> +</span><br><span class="line"> <span class="string">" }\n"</span> +</span><br><span class="line"> <span class="string">" "</span>);</span><br><span class="line"> a.setBody(<span class="string">"{return true;}"</span>);</span><br><span class="line"> <span class="comment">//$1，代表方法的第一个参数</span></span><br><span class="line"> b.setBody(<span class="string">"{$1.setValid(true);$1.k(new java.util.Date(2099,1,1,1,1));super.b($1);}"</span>);</span><br><span class="line"> <span class="comment">//写入文件</span></span><br><span class="line"> ctClass.toBytecode(<span class="keyword">new</span> DataOutputStream(<span class="keyword">new</span> FileOutputStream(<span class="string">"D:/a.class"</span>)));</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>插入 错误日志打印方法 </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><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">CtMethod method = CtMethod.make(<span class="string">"public static void write(Exception e) {\n"</span> +</span><br><span class="line"> <span class="string">" java.io.File file = new java.io.File(\"D:/error.log\");\n"</span> +</span><br><span class="line"> <span class="string">" try {\n"</span> +</span><br><span class="line"> <span class="string">" if (!file.exists()) {\n"</span> +</span><br><span class="line"> <span class="string">" file.createNewFile();\n"</span> +</span><br><span class="line"> <span class="string">" }\n"</span> +</span><br><span class="line"> <span class="string">" e.printStackTrace(new java.io.PrintStream(new java.io.FileOutputStream(file)));\n"</span> +</span><br><span class="line"> <span class="string">" } catch (java.io.IOException ex) {\n"</span> +</span><br><span class="line"> <span class="string">" ex.printStackTrace();\n"</span> +</span><br><span class="line"> <span class="string">" }\n"</span> +</span><br><span class="line"> <span class="string">" }"</span>, ctClass);</span><br><span class="line">ctClass.addMethod(method);</span><br><span class="line">ctClass.toBytecode(<span class="keyword">new</span> DataOutputStream(<span class="keyword">new</span> FileOutputStream(<span class="string">"D:/b.class"</span>)));</span><br></pre></td></tr></table></figure>
<h4 id="遇到的坑"><a href="#遇到的坑" class="headerlink" title="遇到的坑"></a>遇到的坑</h4><p>遇到的坑大概是写类的时候得写全路径名，然后方法体必须包含在{}内部</p>
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