Java多线程——查看线程堆栈信息
摘要：本文主要介绍了查看线程堆栈信息的方法。
使用Thread类的getAllStackTraces()方法
方法定义
可以看到getAllStackTraces()方法的返回值是一个Map对象，key是Thread的实例，value是一个StackTraceElement实例数组：
1 public static Map<Thread, StackTraceElement[]> getAllStackTraces()
使用
可以使用这个静态方法在页面上循环打印，从而获取到运行时的堆栈情况：
1 <body>
2 <%
3 StringBuilder sb = new StringBuilder();
4 Map<Thread, StackTraceElement[]> ts = Thread.getAllStackTraces();
5 for (Thread t : ts.keySet()) {
6 StackTraceElement[] s = ts.get(t);
7 sb.append(t.getName() + ":" + t.getId()).append("<br>");
8 for (StackTraceElement e : s) {
9 sb.append(" ").append(e).append("<br>");
10 }
11 }
12 out.print(sb.toString());
13 %>
14 </body>
页面显示
在页面上显示如下：
1 Reference Handler:2 2 java.lang.Object.wait(Native Method) 3 java.lang.Object.wait(Object.java:502) 4 java.lang.ref.Reference.tryHandlePending(Reference.java:191) 5 java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153) 6 Signal Dispatcher:4 7 SockJS-5:40 8 sun.misc.Unsafe.park(Native Method) 9 java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) 10 java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039) 11 java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1088) 12 java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809) 13 java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067) 14 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127) 15 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 16 java.lang.Thread.run(Thread.java:745) 17 ContainerBackgroundProcessor[StandardEngine[Tomcat]]:27 18 java.lang.Thread.sleep(Native Method) 19 org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1368) 20 java.lang.Thread.run(Thread.java:745) 21 C3P0PooledConnectionPoolManager[identityToken->1hge7sxa31d0rqyw19bxvtp|1e774dd6]-AdminTaskTimer:22 22 java.lang.Object.wait(Native Method) 23 java.util.TimerThread.mainLoop(Timer.java:552) 24 java.util.TimerThread.run(Timer.java:505) 25 SockJS-4:39 26 sun.misc.Unsafe.park(Native Method) 27 java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) 28 java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039) 29 java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1088) 30 java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809) 31 java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067) 32 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127) 33 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 34 java.lang.Thread.run(Thread.java:745) 35 C3P0PooledConnectionPoolManager[identityToken->1hge7sxa31d0rqyw19bxvtp|1084583d]-HelperThread-#2:63 36 java.lang.Object.wait(Native Method) 37 com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:683)