java 从其 ID 获取对线程对象的引用
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Get reference to Thread Object from its ID
提问by SamRowley
How can I get reference to a Running Thread if I know the ID associated with that Thread?
如果我知道与该线程关联的 ID，我如何获得对该线程的引用？
e.g.
例如
long threadID = 12342;
Thread thread = (What goes here?) getThreadFromId(threadID); //I know this is totally made up
采纳答案by bestsss
You have 2 ways to do it. Both are quite simple:
你有 2 种方法来做到这一点。两者都很简单：
Old way: get the root thread group you may access
Thread.currentThread().getGroup()..getParent() in loop. and callenumerate(Thread[])newer (slower though).
for (Thread t : Thread.getAllStackTraces().keySet()) if (t.getId()==id)...
旧方法：获取您可以
Thread.currentThread().getGroup()在循环中访问..getParent()的根线程组。并打电话enumerate(Thread[])较新（虽然较慢）。
for (Thread t : Thread.getAllStackTraces().keySet()) if (t.getId()==id)...
The first method has a small problem that due to a bug in ThreadGroup.destroy(), a ThreadGroup may not enumerate anything at all.
第一种方法有一个小问题，由于 中的错误ThreadGroup.destroy()，ThreadGroup 可能根本不会枚举任何内容。
The second is slower and has a security flaw, though.
但是，第二个速度较慢并且存在安全漏洞。
回答by Muhammed Shakir Misarwala
You can use following code in order to get the Thread Name (For e.g. I want to get names of Threads that are in deadlock )
您可以使用以下代码来获取线程名称（例如，我想获取处于死锁状态的线程的名称）
ThreadMXBean threadMB = ManagementFactory.getThreadMXBean();
long threadIds[] = threadMB.findDeadlockedThreads();
for (long id : threadIds) {
System.out.println("The deadLock Thread id is : " + id
+ " > "
+
threadMB.getThreadInfo(id).getThreadName());
}
