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<div class="section" id="dump">
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<h1>dump<a class="headerlink" href="#dump" 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-dump"><code class="docutils literal notranslate"><span class="pre">dump</span></code>在线教程</a></p>
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<blockquote>
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<div><p>dump 已加载类的 bytecode 到特定目录</p>
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</div></blockquote>
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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"><code>[d:]</code></td>
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<td align="left">设置类文件的目标目录</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="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ dump java.lang.String
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HASHCODE CLASSLOADER LOCATION
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null /Users/admin/logs/arthas/classdump/java/lang/String.class
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Affect(row-cnt:1) cost in 119 ms.</pre></div>
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</div>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ dump demo.*
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HASHCODE CLASSLOADER LOCATION
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3d4eac69 +-sun.misc.Launcher$AppClassLoader@3d4eac69 /Users/admin/logs/arthas/classdump/sun.misc.Launcher$AppClassLoader-3d4eac69/demo/MathGame.class
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+-sun.misc.Launcher$ExtClassLoader@66350f69
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Affect(row-cnt:1) cost in 39 ms.</pre></div>
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</div>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ dump -d /tmp/output java.lang.String
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HASHCODE CLASSLOADER LOCATION
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null /tmp/output/java/lang/String.class
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Affect(row-cnt:1) cost in 138 ms.</pre></div>
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</div>
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<ul class="simple">
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<li><p>指定classLoader</p></li>
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</ul>
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<p>注意hashcode是变化的，需要先查看当前的ClassLoader信息，提取对应ClassLoader的hashcode。</p>
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<p>如果你使用<code class="docutils literal notranslate"><span class="pre">-c</span></code>，你需要手动输入hashcode：<code class="docutils literal notranslate"><span class="pre">-c</span> <span class="pre"><hashcode></span></code></p>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ dump -c 3d4eac69 demo.*</pre></div>
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</div>
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<p>对于只有唯一实例的ClassLoader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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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ dump --classLoaderClass sun.misc.Launcher$AppClassLoader demo.*
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HASHCODE CLASSLOADER LOCATION
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3d4eac69 +-sun.misc.Launcher$AppClassLoader@3d4eac69 /Users/admin/logs/arthas/classdump/sun.misc.Launcher$AppClassLoader-3d4eac69/demo/MathGame.class
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+-sun.misc.Launcher$ExtClassLoader@66350f69
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Affect(row-cnt:1) cost in 39 ms.</pre></div>
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</div>
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<ul class="simple">
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<li><p>注: 这里classLoaderClass 在 java 8 是 sun.misc.Launcher$AppClassLoader，而java 11的classloader是jdk.internal.loader.ClassLoaders$AppClassLoader，katacoda目前环境是java8。</p></li>
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</ul>
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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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