关于ScheduledExecutorService执行一段时间之后就不执行的问题
If any execution of the task encounters an exception, subsequent executions are suppressed.Otherwise, the task will only terminate via cancellation or termination of the executor.
简单总结就是:如果定时任务执行过程中遇到发生异常,则后面的任务将不再执行。
我们可以做个实验验证一下:
先看下面一段代码:
这段代码的执行效果如下:/** * [Copyright] * @author QiFuguang * Aug 25, 2014 9:48:41 PM */ package com.winwill.xx; import java.util.concurrent.Executors; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.TimeUnit; public class Test { private final static ScheduledExecutorService scheduler = Executors.newSingleThreadScheduledExecutor(); public static void main(String[] args) { scheduler.scheduleAtFixedRate(new Runnable() { @Override public void run() { int[] s = new int[1]; System.out.println("OK"); System.out.println(s[1]); // 数组越界 } }, 0, 2, TimeUnit.SECONDS); } }
![关于ScheduledExecutorService执行一段时间之后不在执行的问题 - 黯然神伤 - WinWill2014](http://img0.ph.126.net/g1VP_LQODQyX3m4poHrWVQ==/200973133472084220.png)
再看如下代码:
运行效果如下:/** * [Copyright] * @author QiFuguang * Aug 25, 2014 9:48:41 PM */ package com.winwill.xx; import java.util.concurrent.Executors; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.TimeUnit; public class Test { private final static ScheduledExecutorService scheduler = Executors.newSingleThreadScheduledExecutor(); public static void main(String[] args) { scheduler.scheduleAtFixedRate(new Runnable() { @Override public void run() { try { int[] s = new int[1]; System.out.println("OK"); System.out.println(s[1]); // 数组越界 } catch (Throwable t) { System.out.println("Error"); } } }, 0, 2, TimeUnit.SECONDS); } }
![关于ScheduledExecutorService执行一段时间之后不在执行的问题 - 黯然神伤 - WinWill2014](http://img0.ph.126.net/cXO35if4kjszSQlTn-NYjg==/6598211059728073983.png)
希望对各位同学有用。