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155 lines
4.4 KiB
Plaintext
155 lines
4.4 KiB
Plaintext
jad
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===
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> 反编译指定已加载类的源码
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`jad` 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；
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* 在 Arthas Console 上，反编译出来的源码是带语法高亮的，阅读更方便
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* 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
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### 参数说明
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|参数名称|参数说明|
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|---:|:---|
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|*class-pattern*|类名表达式匹配|
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|`[c:]`|类所属 ClassLoader 的 hashcode|
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|[E]|开启正则表达式匹配，默认为通配符匹配|
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### 使用参考
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>当有多个 `ClassLoader` 都加载了这个类时，`jad` 命令会输出对应 `ClassLoader` 实例的 `hashcode`，然后你只需要重新执行 `jad` 命令，并使用参数 `-c <hashcode>` 就可以反编译指定 ClassLoader 加载的那个类了；
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```java
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$ 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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```
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反编译指定的方法：
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```sh
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$ 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$AppClassLoader@14dad5dc
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+-sun.misc.Launcher$ExtClassLoader@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(String ip, String[] metrics) {
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JSONObject obj;
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HashMap<String, Object> result = new HashMap<String, Object>();
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result.put("success", false);
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String metricUrl = "http://" + ip + ":8006/metrics/specific";
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String postBody = Arrays.stream(metrics).map(metric -> "metric=" + metric).collect(Collectors.joining("&"));
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HttpClientUtils.Response resp = HttpClientUtils.sendPostRequest((String)metricUrl, (String)postBody);
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if (resp.isSuccess() && (obj = JSON.parseObject(resp.getContent())).containsKey("success") && obj.getBoolean("success").booleanValue() && obj.containsKey("data")) {
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JSONArray dataArray = obj.getJSONArray("data");
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HashMap<String, Object> metricMap = new HashMap<String, Object>();
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for (Object aDataArray : dataArray) {
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JSONObject o = (JSONObject)aDataArray;
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metricMap.put(o.getString("metric"), o.get("value"));
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}
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result.put("data", metricMap);
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result.put("success", true);
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return result;
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}
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return result;
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}
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Affect(row-cnt:1) cost in 1508 ms.
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``` |