巧用FutureTask 线程池轻松解决接口超时问题

public class Test {
 //线程池最好作为全局变量, 若作为局部变量记得用完后shutdown()
 ThreadFactory namedThreadFactory = new ThreadFactoryBuilder(）.setNameFormat("thread-start-runner-%d").build();
 ExecutorService taskExe= new ThreadPoolExecutor(10,20,800L, TimeUnit.MILLISECONDS,new LinkedBlockingQueue<Runnable>(100),namedThreadFactory);
 int count=0;
 @Test
 public void test(String[] args) {
  //任务列表
  List<FutureTask<Integer>> taskList=new ArrayList<FutureTask<Integer>>();
  for(int i=0;i<100;i++){
   //创建100个任务放入【任务列表】
   FutureTask<Integer> futureTask=new FutureTask<Integer>(new Callable<Integer>() {
    @Override
    public Integer call() throws Exception {
     return 1;
    }
   });
   //执行的结果装回原来的FutureTask中,后续直接遍历集合taskList来获取结果即可
   taskList.add(futureTask);
   taskExe.submit(futureTask);
  }
  //获取结果
  try{
   for(FutureTask<Integer> futureTask:taskList){
                count+=futureTask.get();
            }
  } catch (InterruptedException e) {
   logger.error("线程执行被中断",e);
  } catch (ExecutionException e) {
   logger.error("线程执行出现异常",e);
  }
  //关闭线程池
  taskExe.shutdown();
  //打印: 100
  System.out.println(count);
 }
}

public Future<?> submit(Runnable task) {
 if (task == null) throw new NullPointerException();
 //创建一个异步执行的任务FutureTask, 【隐患】也在它的run()代码块里
 RunnableFuture<Void> ftask = newTaskFor(task, null);
 execute(ftask);
 return ftask;
}