java中的超时方法 [英] Time out method in java

问题描述

在java类中，我有一个有时需要很长时间才能执行的方法。也许它挂在那个方法流程中。我想要的是如果方法没有在特定时间内完成，程序应退出该方法并继续其余的流程。

In a java class I have a method that sometimes takes a long time for execution. Maybe it hangs in that method flow. What I want is if the method doesn't complete in specific time, the program should exit from that method and continue with the rest of flow.

请告诉我的是有办法处理这种情况。

Please let me know is there any way to handle this situation.

推荐答案

你必须使用线程才能实现这一目标。线程没有害处:)下面的示例运行一段代码10秒然后结束它。

You must use threads in order to achieve this. Threads are not harmful :) Example below run a piece of code for 10 seconds and then ends it.

public class Test {
    public static void main(String args[])
        throws InterruptedException {

        Thread thread = new Thread(new Runnable() {
            @Override
            public void run() {
                System.out.println("0");
                method();
            }
        });
        thread.start();
        long endTimeMillis = System.currentTimeMillis() + 10000;
        while (thread.isAlive()) {
            if (System.currentTimeMillis() > endTimeMillis) {
                System.out.println("1");
                break;
            }
            try {
                System.out.println("2");
                Thread.sleep(500);
            }
            catch (InterruptedException t) {}
        }


    }

    static void method() {
        long endTimeMillis = System.currentTimeMillis() + 10000;
        while (true) {
            // method logic
            System.out.println("3");
            if (System.currentTimeMillis() > endTimeMillis) {
                // do some clean-up
                System.out.println("4");
                return;
            }
        }
    }
}

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