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：
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：
<body>
<%
StringBuilder sb = new StringBuilder();
Map<Thread, StackTraceElement[]> ts = Thread.getAllStackTraces();
for (Thread t : ts.keySet()) {
StackTraceElement[] s = ts.get(t);
sb.append(t.getName() + ":" + t.getId()).append("<br>");
for (StackTraceElement e : s) {
sb.append(" ").append(e).append("<br>");
}
}
out.print(sb.toString());
%>
</body>
页面显示
在页面上显示如下：
Reference Handler:2
java.lang.Object.wait(Native Method)
java.lang.Object.wait(Object.java:502)
java.lang.ref.Reference.tryHandlePending(Reference.java:191)
java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)
Signal Dispatcher:4
SockJS-5:40
sun.misc.Unsafe.park(Native Method)
java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1088)
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
java.lang.Thread.run(Thread.java:745)
ContainerBackgroundProcessor[StandardEngine[Tomcat]]:27
java.lang.Thread.sleep(Native Method)
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1368)
java.lang.Thread.run(Thread.java:745)
C3P0PooledConnectionPoolManager[identityToken->1hge7sxa31d0rqyw19bxvtp|1e774dd6]-AdminTaskTimer:22
java.lang.Object.wait(Native Method)
java.util.TimerThread.mainLoop(Timer.java:552)
java.util.TimerThread.run(Timer.java:505)
SockJS-4:39
sun.misc.Unsafe.park(Native Method)
java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1088)
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
java.lang.Thread.run(Thread.java:745)
C3P0PooledConnectionPoolManager[identityToken->1hge7sxa31d0rqyw19bxvtp|1084583d]-HelperThread-#2:63
java.lang.Object.wait(Native Method)
com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:683)
