多线程，超时处理

2019独角兽企业重金招聘Python工程师标准>>>

1.使用线程池ExecutorService exec = Executors.newFixedThreadPool(1)；

2.根据线程返回的结果Future，进行相应处理

demo如下：

、

package com.test;

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

public class TimeOutTest {

   public static void main(String[] args) {
       System.out.println("程序开始");
       final ExecutorService exec = Executors.newFixedThreadPool(1);

       Callable<String> call = new Callable<String>() {
           public String call() throws Exception {
               // 开始执行耗时操作
               Thread.sleep(1000 * 3);
               System.out.println("程序早结束了，已经没用了。");
               return "线程执行完成.";
           }
       };
       Future<String> future = null;
       try {
           future = exec.submit(call);
           String obj = future.get(1000 * 1, TimeUnit.MILLISECONDS); // 任务处理超时时间设为 1 秒
           System.out.println("任务成功返回:" + obj);
       } catch (TimeoutException ex) {
           System.out.println("处理超时啦....");
           if(future!=null){
               future.cancel(true);
           }
       } catch (Exception e) {
           System.out.println("处理失败.");
       }finally{
           System.out.println("关闭线程池");
           // 关闭线程池
           exec.shutdown();
       }
       System.out.println("程序结束");
   }
}