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Java多线程——查看线程堆栈信息

2019年07月02日  | 移动技术网IT编程  | 我要评论

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("&emsp;").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)

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