import java.time.LocalDateTime;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;

public class LoopTaskTest implements Runnable {

	private static final Executor executor = Executors.newFixedThreadPool(1);

	public void run() {
		try {
			Thread.sleep(2000);
			System.out.println(LocalDateTime.now());
		} catch (Throwable e) {
			System.out.println(e);
		} finally {
			// 提交任务 实现循环
			executor.execute(this);
		}
	}

	public static void main(String[] args) throws Exception {
		LoopTaskTest task = new LoopTaskTest();
		executor.execute(task);
	}

}


 Timer和ScheduledExecutorService的区别 
 ScheduledThreadPoolExecutor使用介绍 
 springBoot定时任务 schedule