场景：
后台服务启动时需要启动一个无限循环的定时任务
实现：
.....
public class Demo extends HttpServlet {
public void init() throws ServletException {
super.init();
ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);
scheduler.scheduleWithFixedDelay(new Runner(), 0, 5, TimeUnit.SECONDS);
}
public class Runner implements Runnable {
public void run() {
......
}
}
......
}
备注：与while(true) Thread.sleep方式相比，更容易控制并可轻易实现多线程
原文： http://www.54chen.com/java-ee/java-example-whiletrue-thread-sleep.html