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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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<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/zhuyong/Downloads/taobao-hsf.sar/plugins/monitor/lib/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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public static Logger getLogger(String name)
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{
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return LogManager.getLogger(name);
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}
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public static Logger getLogger(Class clazz)
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{
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return LogManager.getLogger(clazz.getName());
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}
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public static Logger getRootLogger()
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{
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return LogManager.getRootLogger();
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}
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public static Logger getLogger(String name, LoggerFactory factory)
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{
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return LogManager.getLogger(name, factory);
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}
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public void trace(Object message)
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{
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if (repository.isDisabled(5000))
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{
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return;
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}
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if (Level.TRACE.isGreaterOrEqual(getEffectiveLevel()))
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{
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forcedLog(Logger.FQCN, Level.TRACE, message, null);
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}
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}
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public void trace(Object message, Throwable t)
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{
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if (repository.isDisabled(5000))
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{
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return;
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}
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if (Level.TRACE.isGreaterOrEqual(getEffectiveLevel()))
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{
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forcedLog(Logger.FQCN, Level.TRACE, message, t);
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}
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}
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public boolean isTraceEnabled()
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{
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if (repository.isDisabled(5000))
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{
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return false;
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}
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return Level.TRACE.isGreaterOrEqual(getEffectiveLevel());
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}
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static
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{
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Logger.FQCN = Logger.class.getName();
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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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<p>反编译指定的方法：</p>
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<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>$ jad com.taobao.container.web.arthas.rest.MetricsController directMetrics
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ClassLoader:
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+-com.taobao.pandora.boot.loader.ReLaunchURLClassLoader@1817d444
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+-sun.misc.Launcher<span class="nv">$AppClassLoader</span>@14dad5dc
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+-sun.misc.Launcher<span class="nv">$ExtClassLoader</span>@a38d7a3
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Location:
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/Users/zhuyong/middleware/tomcat-web/tomcat-web-web/target/classes/
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private Map<String, Object> directMetrics<span class="o">(</span>String ip, String<span class="o">[]</span> metrics<span class="o">)</span> <span class="o">{</span>
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JSONObject obj<span class="p">;</span>
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HashMap<String, Object> <span class="nv">result</span> <span class="o">=</span> new HashMap<String, Object><span class="o">()</span><span class="p">;</span>
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result.put<span class="o">(</span><span class="s2">"success"</span>, <span class="nb">false</span><span class="o">)</span><span class="p">;</span>
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String <span class="nv">metricUrl</span> <span class="o">=</span> <span class="s2">"http://"</span> + ip + <span class="s2">":8006/metrics/specific"</span><span class="p">;</span>
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String <span class="nv">postBody</span> <span class="o">=</span> Arrays.stream<span class="o">(</span>metrics<span class="o">)</span>.map<span class="o">(</span>metric -> <span class="s2">"metric="</span> + metric<span class="o">)</span>.collect<span class="o">(</span>Collectors.joining<span class="o">(</span><span class="s2">"&"</span><span class="o">))</span><span class="p">;</span>
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HttpClientUtils.Response <span class="nv">resp</span> <span class="o">=</span> HttpClientUtils.sendPostRequest<span class="o">((</span>String<span class="o">)</span>metricUrl, <span class="o">(</span>String<span class="o">)</span>postBody<span class="o">)</span><span class="p">;</span>
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<span class="k">if</span> <span class="o">(</span>resp.isSuccess<span class="o">()</span> <span class="o">&&</span> <span class="o">(</span><span class="nv">obj</span> <span class="o">=</span> JSON.parseObject<span class="o">(</span>resp.getContent<span class="o">()))</span>.containsKey<span class="o">(</span><span class="s2">"success"</span><span class="o">)</span> <span class="o">&&</span> obj.getBoolean<span class="o">(</span><span class="s2">"success"</span><span class="o">)</span>.booleanValue<span class="o">()</span> <span class="o">&&</span> obj.containsKey<span class="o">(</span><span class="s2">"data"</span><span class="o">))</span> <span class="o">{</span>
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JSONArray <span class="nv">dataArray</span> <span class="o">=</span> obj.getJSONArray<span class="o">(</span><span class="s2">"data"</span><span class="o">)</span><span class="p">;</span>
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HashMap<String, Object> <span class="nv">metricMap</span> <span class="o">=</span> new HashMap<String, Object><span class="o">()</span><span class="p">;</span>
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<span class="k">for</span> <span class="o">(</span>Object aDataArray : dataArray<span class="o">)</span> <span class="o">{</span>
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JSONObject <span class="nv">o</span> <span class="o">=</span> <span class="o">(</span>JSONObject<span class="o">)</span>aDataArray<span class="p">;</span>
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metricMap.put<span class="o">(</span>o.getString<span class="o">(</span><span class="s2">"metric"</span><span class="o">)</span>, o.get<span class="o">(</span><span class="s2">"value"</span><span class="o">))</span><span class="p">;</span>
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<span class="o">}</span>
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result.put<span class="o">(</span><span class="s2">"data"</span>, metricMap<span class="o">)</span><span class="p">;</span>
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result.put<span class="o">(</span><span class="s2">"success"</span>, <span class="nb">true</span><span class="o">)</span><span class="p">;</span>
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<span class="k">return</span> result<span class="p">;</span>
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<span class="o">}</span>
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<span class="k">return</span> result<span class="p">;</span>
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<span class="o">}</span>
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Affect<span class="o">(</span>row-cnt:1<span class="o">)</span> cost in <span class="m">1508</span> ms.
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</pre></div>
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</div>
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© Copyright 2018, Alibaba Middleware Group, and contributors.
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