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<div class="section" id="jad">
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<span id="jad"></span><h1>jad<a class="headerlink" href="#jad" title="永久链接至标题">¶</a></h1>
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<blockquote>
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<div>反编译指定已加载类的源码</div></blockquote>
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<p><code class="docutils literal notranslate"><span class="pre">jad</span></code> 命令将 JVM 中实际运行的 class 的 byte code 反编译成 java 代码，便于你理解业务逻辑；</p>
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<ul class="simple">
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<li>在 Arthas Console 上，反编译出来的源码是带语法高亮的，阅读更方便</li>
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<li>当然，反编译出来的 java 代码可能会存在语法错误，但不影响你进行阅读理解</li>
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</ul>
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<div class="section" id="">
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<span id="id1"></span><h2>参数说明<a class="headerlink" href="#" title="永久链接至标题">¶</a></h2>
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<table border="1" class="docutils">
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<thead>
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<tr>
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<th align="right">参数名称</th>
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<th align="left">参数说明</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td align="right"><em>class-pattern</em></td>
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<td align="left">类名表达式匹配</td>
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</tr>
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<tr>
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<td align="right"><code>[c:]</code></td>
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<td align="left">类所属 ClassLoader 的 hashcode</td>
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</tr>
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<tr>
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<td align="right">[E]</td>
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<td align="left">开启正则表达式匹配，默认为通配符匹配</td>
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</tr>
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</tbody>
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</table></div>
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<div class="section" id="">
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<span id="id2"></span><h2>使用参考<a class="headerlink" href="#" title="永久链接至标题">¶</a></h2>
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<div class="section" id="java-lang-string">
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<span id="java-lang-string"></span><h3>编绎<code class="docutils literal notranslate"><span class="pre">java.lang.String</span></code><a class="headerlink" href="#java-lang-string" title="永久链接至标题">¶</a></h3>
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<div class="highlight-java notranslate"><div class="highlight"><pre><span></span><span class="n">$</span> <span class="n">jad</span> <span class="n">java</span><span class="o">.</span><span class="na">lang</span><span class="o">.</span><span class="na">String</span>
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<span class="nl">ClassLoader:</span>
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<span class="nl">Location:</span>
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<span class="cm">/*</span>
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<span class="cm">* Decompiled with CFR 0_132.</span>
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<span class="cm">*/</span>
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<span class="kn">package</span> <span class="nn">java.lang</span><span class="o">;</span>
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<span class="kn">import</span> <span class="nn">java.io.ObjectStreamField</span><span class="o">;</span>
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<span class="o">...</span>
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<span class="kd">public</span> <span class="kd">final</span> <span class="kd">class</span> <span class="nc">String</span>
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<span class="kd">implements</span> <span class="n">Serializable</span><span class="o">,</span>
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<span class="n">Comparable</span><span class="o"><</span><span class="n">String</span><span class="o">>,</span>
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<span class="n">CharSequence</span> <span class="o">{</span>
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<span class="kd">private</span> <span class="kd">final</span> <span class="kt">char</span><span class="o">[]</span> <span class="n">value</span><span class="o">;</span>
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<span class="kd">private</span> <span class="kt">int</span> <span class="n">hash</span><span class="o">;</span>
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<span class="kd">private</span> <span class="kd">static</span> <span class="kd">final</span> <span class="kt">long</span> <span class="n">serialVersionUID</span> <span class="o">=</span> <span class="o">-</span><span class="mi">6849794470754667710L</span><span class="o">;</span>
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<span class="kd">private</span> <span class="kd">static</span> <span class="kd">final</span> <span class="n">ObjectStreamField</span><span class="o">[]</span> <span class="n">serialPersistentFields</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ObjectStreamField</span><span class="o">[</span><span class="mi">0</span><span class="o">];</span>
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<span class="kd">public</span> <span class="kd">static</span> <span class="kd">final</span> <span class="n">Comparator</span><span class="o"><</span><span class="n">String</span><span class="o">></span> <span class="n">CASE_INSENSITIVE_ORDER</span> <span class="o">=</span> <span class="k">new</span> <span class="n">CaseInsensitiveComparator</span><span class="o">();</span>
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<span class="kd">public</span> <span class="nf">String</span><span class="o">(</span><span class="kt">byte</span><span class="o">[]</span> <span class="n">arrby</span><span class="o">,</span> <span class="kt">int</span> <span class="n">n</span><span class="o">,</span> <span class="kt">int</span> <span class="n">n2</span><span class="o">)</span> <span class="o">{</span>
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<span class="n">String</span><span class="o">.</span><span class="na">checkBounds</span><span class="o">(</span><span class="n">arrby</span><span class="o">,</span> <span class="n">n</span><span class="o">,</span> <span class="n">n2</span><span class="o">);</span>
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<span class="k">this</span><span class="o">.</span><span class="na">value</span> <span class="o">=</span> <span class="n">StringCoding</span><span class="o">.</span><span class="na">decode</span><span class="o">(</span><span class="n">arrby</span><span class="o">,</span> <span class="n">n</span><span class="o">,</span> <span class="n">n2</span><span class="o">);</span>
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<span class="o">}</span>
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<span class="o">...</span>
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</pre></div>
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</div>
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</div>
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<div class="section" id="">
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<span id="id3"></span><h3>反编绎指定的函数<a class="headerlink" href="#" title="永久链接至标题">¶</a></h3>
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<div class="highlight-java notranslate"><div class="highlight"><pre><span></span>$ jad demo.MathGame main
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ClassLoader:
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+-sun.misc.Launcher$AppClassLoader@3d4eac69
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+-sun.misc.Launcher$ExtClassLoader@66350f69
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Location:
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/private/tmp/arthas-demo.jar
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public static void main(String[] args) throws InterruptedException {
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MathGame game = new MathGame();
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do {
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game.run();
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TimeUnit.SECONDS.sleep(1L);
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} while (true);
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}
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Affect(row-cnt:1) cost in 228 ms.
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</pre></div>
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</div>
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</div>
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<div class="section" id="classloader">
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<span id="classloader"></span><h3>反编绎时指定ClassLoader<a class="headerlink" href="#classloader" title="永久链接至标题">¶</a></h3>
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<blockquote>
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<div>当有多个 <code class="docutils literal notranslate"><span class="pre">ClassLoader</span></code> 都加载了这个类时，<code class="docutils literal notranslate"><span class="pre">jad</span></code> 命令会输出对应 <code class="docutils literal notranslate"><span class="pre">ClassLoader</span></code> 实例的 <code class="docutils literal notranslate"><span class="pre">hashcode</span></code>，然后你只需要重新执行 <code class="docutils literal notranslate"><span class="pre">jad</span></code> 命令，并使用参数 <code class="docutils literal notranslate"><span class="pre">-c</span> <span class="pre"><hashcode></span></code> 就可以反编译指定 ClassLoader 加载的那个类了；</div></blockquote>
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<div class="highlight-java notranslate"><div class="highlight"><pre><span></span>$ jad org.apache.log4j.Logger
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Found more than one class for: org.apache.log4j.Logger, Please use jad -c hashcode org.apache.log4j.Logger
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HASHCODE CLASSLOADER
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69dcaba4 +-monitor's ModuleClassLoader
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6e51ad67 +-java.net.URLClassLoader@6e51ad67
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+-sun.misc.Launcher$AppClassLoader@6951a712
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+-sun.misc.Launcher$ExtClassLoader@6fafc4c2
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2bdd9114 +-pandora-qos-service's ModuleClassLoader
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4c0df5f8 +-pandora-framework's ModuleClassLoader
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Affect(row-cnt:0) cost in 38 ms.
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$ jad org.apache.log4j.Logger -c 69dcaba4
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ClassLoader:
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+-monitor's ModuleClassLoader
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Location:
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/Users/admin/app/log4j-1.2.14.jar
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package org.apache.log4j;
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import org.apache.log4j.spi.*;
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public class Logger extends Category
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{
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private static final String FQCN;
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protected Logger(String name)
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{
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super(name);
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}
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...
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Affect(row-cnt:1) cost in 190 ms.
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</pre></div>
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</div>
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