java 停止一个正在运行的线程

中断（Interrupt）一个线程意味着在该线程完成任务之前停止其正在进行的一切，有效地中止其当前的操作。线程是死亡、还是等待新的任务或是继续运行至下一步，就取决于这个程序。虽然初次看来它可能显得简单，但是，你必须进行一些预警以实现期望的结果。你最好还是牢记以下的几点告诫。

首先，忘掉Thread.stop方法。虽然它确实停止了一个正在运行的线程，然而，这种方法是不安全也是不受提倡的，这意味着，在未来的JAVA版本中，它将不复存在。

1：

public static void main(String[] args) throws Exception {
 MyThread mt = new MyThread();
 Thread t = new Thread(mt);
 System.out.println("System is ready to start thread");
 t.start();

 Thread.sleep(3000);

 System.out.println("System is ready to stop thread");
 //线程没有处于阻塞状态，调用线程对应的interrupt()不能让运行的线程停止下来
 t.interrupt();
 }

 static class MyThread implements Runnable {

 public volatile boolean stop = false;

 private void dosomethig() throws InterruptedException {
 long time = System.currentTimeMillis();
 while(System.currentTimeMillis() - time < 1000) {

 }
 System.out.println("all things had been done!!");
 }

 @Override
 public void run() {
 try {
 while(!stop) {
 System.out.println(Thread.currentThread().getName() + " is running..");
 dosomethig();
 }
 } catch (InterruptedException e) {
 e.printStackTrace();
 } finally {
 System.out.println(Thread.currentThread().getName() + " is exiting under request.");
 }
 }
 }

运行结果：
System is ready to start thread
Thread-0 is running..
all things had been done!!
Thread-0 is running..
all things had been done!!
Thread-0 is running..
all things had been done!!
Thread-0 is running..
System is ready to stop thread
all things had been done!!
Thread-0 is running..
all things had been done!!
Thread-0 is running..
all things had been done!!
Thread-0 is running..
all things had been done!!
Thread-0 is running..

 

 

2：

public static void main(String[] args) throws Exception {
 MyThread mt = new MyThread();
 Thread t = new Thread(mt);
 System.out.println("System is ready to start thread");
 t.start();

 Thread.sleep(3000);

 System.out.println("System is ready to stop thread");
// t.interrupt();
 //当线程没有处于阻塞状态，通过改变标志量，可以让线程停止运行
 mt.stop = true;
 }

运行结果：
System is ready to start thread
Thread-0 is running..
all things had been done!!
Thread-0 is running..
all things had been done!!
Thread-0 is running..
System is ready to stop thread
all things had been done!!
Thread-0 is exiting under request.

 

3：

public static void main(String[] args) throws Exception {
 MyThread mt = new MyThread();
 Thread t = new Thread(mt);
 System.out.println("System is ready to start thread");
 t.start();

 Thread.sleep(3000);

 System.out.println("System is ready to stop thread");
// t.interrupt();
 //此时线程一直处于阻塞状态，无法检查标志量，所以仅通过改变标志量无法停止线程
 mt.stop = true;
 }

 static class MyThread implements Runnable {

 public volatile boolean stop = false;

 private void dosomethig() throws InterruptedException {
// long time = System.currentTimeMillis();
// while(System.currentTimeMillis() - time < 1000) {
//
// }
 Thread.currentThread().join();
 System.out.println("all things had been done!!");
 }

 @Override
 public void run() {
 try {
 while(!stop) {
 System.out.println(Thread.currentThread().getName() + " is running..");
 dosomethig();
 }
 } catch (InterruptedException e) {
 e.printStackTrace();
 } finally {
 System.out.println(Thread.currentThread().getName() + " is exiting under request.");
 }
 }
 }

运行结果：
System is ready to start thread
Thread-0 is running..
System is ready to stop thread

4：

public static void main(String[] args) throws Exception {
 MyThread mt = new MyThread();
 Thread t = new Thread(mt);
 System.out.println("System is ready to start thread");
 t.start();

 Thread.sleep(3000);

 System.out.println("System is ready to stop thread");
 //通过调用线程对象上的interrupt() 正在运行的线程对象会接收到一个InterruptedException异常，从而停止运行
 t.interrupt();
// mt.stop = true;
 }

运行结果:
System is ready to start thread
Thread-0 is running..
System is ready to stop thread
java.lang.InterruptedException
Thread-0 is exiting under request.
 at java.lang.Object.wait(Native Method)
 at java.lang.Thread.join(Thread.java:1143)
 at java.lang.Thread.join(Thread.java:1196)
 at com.thread.DeadLockTest$MyThread.dosomethig(DeadLockTest.java:29)
 at com.thread.DeadLockTest$MyThread.run(DeadLockTest.java:38)
 at java.lang.Thread.run(Thread.java:619)

 

5：中断I/O操作

public static void main(String[] args) throws Exception {
 MyThread mt = new MyThread();
 Thread t = new Thread(mt);
 System.out.println("System is ready to start thread");
 t.start();

 Thread.sleep(3000);

 System.out.println("System is ready to stop thread");
 t.interrupt();
 mt.stop = true;
 mt.socket.close();
 }

 static class MyThread implements Runnable {
 public volatile boolean stop = false;
 ServerSocket socket = null;

 private void dosomethig() throws InterruptedException, IOException {
// long time = System.currentTimeMillis();
// while(System.currentTimeMillis() - time < 1000) {
//
// }
// Thread.currentThread().join();
 socket = new ServerSocket(9999);
 //这里需要调用Socket对应的close方法 这样子 被阻塞的线程会接收到一个SocketException 从而停止运行
 socket.accept();
 System.out.println("all things had been done!!");
 }

 @Override
 public void run() {
 try {
 while(!stop) {
 System.out.println(Thread.currentThread().getName() + " is running..");
 dosomethig();
 }
 } catch (InterruptedException e) {
 e.printStackTrace();
 } catch (IOException e) {
 e.printStackTrace();
 } finally {
 System.out.println(Thread.currentThread().getName() + " is exiting under request.");
 }
 }
 }

运行结果：
System is ready to start thread
Thread-0 is running..
System is ready to stop thread
java.net.SocketException: socket closed
Thread-0 is exiting under request.
 at java.net.PlainSocketImpl.socketAccept(Native Method)
 at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:384)
 at java.net.ServerSocket.implAccept(ServerSocket.java:453)
 at java.net.ServerSocket.accept(ServerSocket.java:421)
 at com.thread.DeadLockTest$MyThread.dosomethig(DeadLockTest.java:33)
 at com.thread.DeadLockTest$MyThread.run(DeadLockTest.java:42)
 at java.lang.Thread.run(Thread.java:619)

 

 

参考》

http://www.blogjava.net/jinfeng_wang/archive/2008/04/27/196477.html