ScheduledExecutorService启动停止多次

您可以重用调度程序,但不应该关闭它。相反,取消调用scheduleAtFixedRate方法时可以获得的正在运行的线程。前任:

//get reference to the future
Future<?> future = service.scheduleAtFixedRate(runnable, INITIAL_DELAY, INTERVAL, TimeUnit.SECONDS)
//cancel instead of shutdown
future.cancel(true);
//schedule again (reuse)
future = service.scheduleAtFixedRate(runnable, INITIAL_DELAY, INTERVAL, TimeUnit.SECONDS)
//shutdown when you don't need to reuse the service anymore
service.shutdown()

的javadocs shutdown() 说:

Initiates an orderly shutdown in which previously submitted tasks are executed,
but no new tasks will be accepted.

所以,你不能打电话 shutdow() 然后安排新任务。

你不能让你的执行者在关闭后接受新任务。更相关的问题是,为什么你首先需要关闭它?您创建的执行器应该在应用程序或子系统的整个生命周期内重复使用。