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<li class="toctree-l3"><a class="reference internal" href="#id1">参数说明</a></li>
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<li class="toctree-l4"><a class="reference internal" href="#java-lang-string">编译<code class="docutils literal notranslate"><span class="pre">java.lang.String</span></code></a></li>
<li class="toctree-l4"><a class="reference internal" href="#id3">反编绎时只显示源代码</a></li>
<li class="toctree-l4"><a class="reference internal" href="#id4">反编译指定的函数</a></li>
<li class="toctree-l4"><a class="reference internal" href="#classloader">反编译时指定ClassLoader</a></li>
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<div class="section" id="jad">
<h1>jad<a class="headerlink" href="#jad" title="永久链接至标题">¶</a></h1>
<blockquote>
<div><p>反编译指定已加载类的源码</p>
</div></blockquote>
<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>
<ul class="simple">
<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>
<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>
</ul>
<div class="section" id="id1">
<h2>参数说明<a class="headerlink" href="#id1" title="永久链接至标题">¶</a></h2>
<table border="1" class="docutils">
<thead>
<tr>
<th align="right">参数名称</th>
<th align="left">参数说明</th>
</tr>
</thead>
<tbody>
<tr>
<td align="right"><em>class-pattern</em></td>
<td align="left">类名表达式匹配</td>
</tr>
<tr>
<td align="right"><code>[c:]</code></td>
<td align="left">类所属 ClassLoader 的 hashcode</td>
</tr>
<tr>
<td align="right">[E]</td>
<td align="left">开启正则表达式匹配，默认为通配符匹配</td>
</tr>
</tbody>
</table></div>
<div class="section" id="id2">
<h2>使用参考<a class="headerlink" href="#id2" title="永久链接至标题">¶</a></h2>
<div class="section" id="java-lang-string">
<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>
<div class="highlight-java notranslate"><div class="highlight hljs"><pre class="java">$ jad java.lang.String
ClassLoader:
Location:
/*
* Decompiled with CFR 0_132.
*/
package java.lang;
import java.io.ObjectStreamField;
...
public final class String
implements Serializable,
Comparable<String>,
CharSequence {
private final char[] value;
private int hash;
private static final long serialVersionUID = -6849794470754667710L;
private static final ObjectStreamField[] serialPersistentFields = new ObjectStreamField[0];
public static final Comparator<String> CASE_INSENSITIVE_ORDER = new CaseInsensitiveComparator();
public String(byte[] arrby, int n, int n2) {
String.checkBounds(arrby, n, n2);
this.value = StringCoding.decode(arrby, n, n2);
}
...</pre></div>
</div>
</div>
<div class="section" id="id3">
<h3>反编绎时只显示源代码<a class="headerlink" href="#id3" title="永久链接至标题">¶</a></h3>
<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="redefine.html"><span class="doc">redefine</span></a>命令结合使用。</p>
<div class="highlight-default notranslate"><pre class="literal-block">$ jad --source-only demo.MathGame
/*
* Decompiled with CFR 0_132.
*/
package demo;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Random;
import java.util.concurrent.TimeUnit;
public class MathGame {
private static Random random = new Random();
public int illegalArgumentCount = 0;
...</pre>
</div>
</div>
<div class="section" id="id4">
<h3>反编译指定的函数<a class="headerlink" href="#id4" title="永久链接至标题">¶</a></h3>
<div class="highlight-java notranslate"><div class="highlight hljs"><pre class="java">$ jad demo.MathGame main
ClassLoader:
+-sun.misc.Launcher$AppClassLoader@3d4eac69
+-sun.misc.Launcher$ExtClassLoader@66350f69
Location:
/private/tmp/arthas-demo.jar
public static void main(String[] args) throws InterruptedException {
MathGame game = new MathGame();
do {
game.run();
TimeUnit.SECONDS.sleep(1L);
} while (true);
}
Affect(row-cnt:1) cost in 228 ms.</pre></div>
</div>
</div>
<div class="section" id="classloader">
<h3>反编译时指定ClassLoader<a class="headerlink" href="#classloader" title="永久链接至标题">¶</a></h3>
<blockquote>
<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>
</div></blockquote>
<div class="highlight-java notranslate"><div class="highlight hljs"><pre class="java">$ jad org.apache.log4j.Logger
Found more than one class for: org.apache.log4j.Logger, Please use jad -c hashcode org.apache.log4j.Logger
HASHCODE CLASSLOADER
69dcaba4 +-monitor's ModuleClassLoader
6e51ad67 +-java.net.URLClassLoader@6e51ad67
+-sun.misc.Launcher$AppClassLoader@6951a712
+-sun.misc.Launcher$ExtClassLoader@6fafc4c2
2bdd9114 +-pandora-qos-service's ModuleClassLoader
4c0df5f8 +-pandora-framework's ModuleClassLoader
Affect(row-cnt:0) cost in 38 ms.
$ jad org.apache.log4j.Logger -c 69dcaba4
ClassLoader:
+-monitor's ModuleClassLoader
Location:
/Users/admin/app/log4j-1.2.14.jar
package org.apache.log4j;
import org.apache.log4j.spi.*;
public class Logger extends Category
{
private static final String FQCN;
protected Logger(String name)
{
super(name);
}
...
Affect(row-cnt:1) cost in 190 ms.</pre></div>
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