java 超时 实现

有一个需求,就是当一个方法执行超时的时候就中断该方法.
java的超时实现,在网上搜到的大部分是:
方法1.(由于不能达到预想的目的 就不列出来了)
　　实现描述:使用一个守护线程作为计时器,并且在计时结束时抛出一个未检测异常。
方法2.
用join,就是在主线程里开一个子线程(t),在子线程里去处理超时任务,主线程t.join(3000),3000为要等待的时间(ms),如果子线程没有超时则正常继续执行,如果超时了则中断该子线程t.interrupt();
代码如下:

public class ThreadTest {

    public static void main(String[] args) {

        CounterThread ct = new CounterThread(5000);

        System.out.println("start...");

        System.out.println("ct start...");
        ct.start();

        System.out.println("ct join...");
        try {
			ct.join(2000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
        System.out.println(ct.isAlive());
        ct.interrupt();
        System.out.println(ct.isAlive());

        System.out.println("the result is " + ct.getResult());

    }

}

class CounterThread extends Thread {
	private int time;
    public CounterThread(int time) {
    	this.time = time;
    }

    private int result;

    public int getResult() {
        return result;
    }

    public void run() {
        try {

            Thread.sleep(time);
            System.out.println(Thread.currentThread().getName()
                    + " is blocked for " + time + "ms");
        } catch (InterruptedException ex) {

        }
        result = 5;
    }
}

这种方式是可以的,其实还有另外一种方式,就是

public class TimeoutTest1 {

    public static void main(String[] args) {
        final ExecutorService service = Executors.newFixedThreadPool(1);

        TaskThread taskThread = new TaskThread();

        System.out.println("提交任务...begin");

        Future<Object> taskFuture = service.submit(taskThread);
        System.out.println("提交任务...end");
        try {
        	System.out.println("get .... begin");
			Object re = taskFuture.get(1000, TimeUnit.MILLISECONDS);
			System.out.println(re);
			System.out.println("get .... end");
		} catch (InterruptedException e) {
			e.printStackTrace();
		} catch (ExecutionException e) {
			e.printStackTrace();
		} catch (TimeoutException e) {
			System.out.println("超时 取消任务");
			taskFuture.cancel(true);
			System.out.println("超时 取消任务OK");
		}finally{
			System.out.println("关闭服务");
			service.shutdown();
			System.out.println("关闭服务OK");
		}

    }

}
class TaskThread implements Callable<Object> {


    public Object call() throws Exception {
    	String result = "空结果";
        try {
        	System.out.println("任务开始....");
            Thread.sleep(5000);
            result = "正确结果";
            System.out.println("任务结束....");
        } catch (Exception e) {    
            System.out.println("Task is interrupted!");
        }
        return result ;
    }

}