线程池使用简单示例
1 private static ExecutorService executor = Executors.newFixedThreadPool(4); 2 public void dispatch() { 3 while (true) { 4 List<Callable<String>> tasks = new ArrayList<Callable<String>>(); 5 List<Member> memberList = taskTodo(); //当前需要处理的任务集 6 for (final Member each : memberList) { 7 tasks.add(new Callable<String>() { 8 @Override 9 public String call() { 10 todoEachTask(each); //处理每个任务 11 return "ok"; 12 } 13 }); 14 } 15 try { 16 executor.invokeAll(tasks, 480, TimeUnit.SECONDS); //如果8分钟还未执行完,则超时重新再来 17 }catch (Exception e) { 18 } 19 try { 20 Thread.sleep(1000); //休眠1秒后继续处理任务 21 } catch (InterruptedException e) { 22 } 23 } 24 }
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