Java多线程——查看线程堆栈信息
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2022-04-09 19:41:32
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StackTraceEl ......
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)
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