java中一個定時程式

自己封裝一個類

代碼如下

複製代碼

package com.anllin.utils; import java.text.DateFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; import java.util.concurrent.ScheduledThreadPoolExecutor; import java.util.concurrent.TimeUnit; public class ScheduleUtil {     private static DateFormat format()     {         return new SimpleDateFormat("HH:mm:ss:SSS");     }     private static Date parseTime(String time) throws ParseException     {         return format().parse(time);     }     private static long getOneDayMilliseconds()     {         return 24 * 60 * 60 * 1000L;     }     private static long getMillisecondsInOneDayBetween(String now, String future) throws ParseException     {         Date nowDate = parseTime(now);         Date futureDate = parseTime(future);         long nowTime = nowDate.getTime();         long futureTime = futureDate.getTime();         if (futureTime > nowTime)         {             return futureTime - nowTime;         }         else         {             return (futureTime + getOneDayMilliseconds()) - nowTime;         }     }     public static void scheduleEveryday(ScheduledThreadPoolExecutor executor, Runnable command,             String executedEverydayAt) throws ParseException     {         long initialDelay = getMillisecondsInOneDayBetween(format().format(new Date()), executedEverydayAt);         long period = getOneDayMilliseconds();         executor.scheduleAtFixedRate(command, initialDelay, period, TimeUnit.MILLISECONDS);     } }

調用方法

代碼如下

複製代碼

public static void main(String[] args) throws Exception     {         ScheduledThreadPoolExecutor executor = new ScheduledThreadPoolExecutor(5);         String executedEverydayAt = "12:00:00:000";         ScheduleUtil.scheduleEveryday(executor, new Runnable(){             public void run()             {                 System.out.println("執行商務邏輯");             }         }, executedEverydayAt);     }