线程池使用简单示例

private static ExecutorService executor = Executors.newFixedThreadPool(4);
public void dispatch() {
        while (true) {
            List<Callable<String>> tasks = new ArrayList<Callable<String>>();
            List<Member> memberList = taskTodo(); //当前需要处理的任务集
            for (final Member each : memberList) {
                tasks.add(new Callable<String>() {
                    @Override
                    public String call() {
                        todoEachTask(each); //处理每个任务
                        return "ok";
                    }
                });
            }
            try {
                executor.invokeAll(tasks, 480, TimeUnit.SECONDS); //如果8分钟还未执行完，则超时重新再来
            }catch (Exception e) {
            }
            try {
                Thread.sleep(1000); //休眠1秒后继续处理任务
            } catch (InterruptedException e) {
            }
        }
    }

注意: private static  ExecutorService executor = Executors.newCachedThreadPool(); 

newCachedThreadPool最大线程数为整型的最大值，每提交一个任务，如果没有线程处理，那就产生一个新的线程。当我们for循环提交任务时，开辟了上百个线程，应用程序马上崩溃