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<li>jad</li>
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<a href="https://github.com/alibaba/arthas/blob/master/site/src/site/sphinx/jad.md" class="fa fa-github"> Edit on GitHub</a>
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<div class="section" id="jad">
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<h1>jad<a class="headerlink" href="#jad" title="永久链接至标题">¶</a></h1>
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<p><a class="reference external" href="https://arthas.aliyun.com/doc/arthas-tutorials?language=cn&id=command-jad"><code class="docutils literal notranslate"><span class="pre">jad</span></code>在线教程</a></p>
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<blockquote>
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<div><p>反编译指定已加载类的源码</p>
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</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><p>在 Arthas Console 上，反编译出来的源码是带语法高亮的，阅读更方便</p></li>
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<li><p>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</p></li>
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</ul>
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<div class="section" id="id1">
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<h2>参数说明<a class="headerlink" href="#id1" 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"><code>[classLoaderClass:]</code></td>
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<td align="left">指定执行表达式的 ClassLoader 的 class name</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="id2">
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<h2>使用参考<a class="headerlink" href="#id2" 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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<h3>编译<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 hljs"><pre class="java">$ jad java.lang.String
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ClassLoader:
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Location:
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/*
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* Decompiled with CFR 0_132.
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*/
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package java.lang;
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import java.io.ObjectStreamField;
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...
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public final class String
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implements Serializable,
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Comparable<String>,
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CharSequence {
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private final char[] value;
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private int hash;
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private static final long serialVersionUID = -6849794470754667710L;
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private static final ObjectStreamField[] serialPersistentFields = new ObjectStreamField[0];
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public static final Comparator<String> CASE_INSENSITIVE_ORDER = new CaseInsensitiveComparator();
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public String(byte[] arrby, int n, int n2) {
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String.checkBounds(arrby, n, n2);
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this.value = StringCoding.decode(arrby, n, n2);
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}
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...</pre></div>
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</div>
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</div>
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<div class="section" id="id3">
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<h3>反编译时只显示源代码<a class="headerlink" href="#id3" title="永久链接至标题">¶</a></h3>
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<p>默认情况下，反编译结果里会带有<code class="docutils literal notranslate"><span class="pre">ClassLoader</span></code>信息，通过<code class="docutils literal notranslate"><span class="pre">--source-only</span></code>选项，可以只打印源代码。方便和<a class="reference internal" href="mc.html"><span class="doc">mc</span></a>/<a class="reference internal" href="retransform.html"><span class="doc">retransform</span></a>命令结合使用。</p>
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<div class="highlight-default notranslate"><pre class="literal-block">$ jad --source-only demo.MathGame
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/*
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* Decompiled with CFR 0_132.
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*/
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package demo;
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import java.io.PrintStream;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Random;
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import java.util.concurrent.TimeUnit;
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public class MathGame {
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private static Random random = new Random();
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public int illegalArgumentCount = 0;
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...</pre>
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</div>
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</div>
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<div class="section" id="id4">
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<h3>反编译指定的函数<a class="headerlink" href="#id4" title="永久链接至标题">¶</a></h3>
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<div class="highlight-java notranslate"><div class="highlight hljs"><pre class="java">$ 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.</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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<h3>反编译时指定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><p>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；</p>
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</div></blockquote>
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<div class="highlight-java notranslate"><div class="highlight hljs"><pre class="java">$ 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.</pre></div>
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</div>
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<p>对于只有唯一实例的ClassLoader还可以通过<code class="docutils literal notranslate"><span class="pre">--classLoaderClass</span></code>指定class name，使用起来更加方便：</p>
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<p><code class="docutils literal notranslate"><span class="pre">--classLoaderClass</span></code> 的值是ClassLoader的类名，只有匹配到唯一的ClassLoader实例时才能工作，目的是方便输入通用命令，而<code class="docutils literal notranslate"><span class="pre">-c</span> <span class="pre"><hashcode></span></code>是动态变化的。</p>
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