我正在开发一种服务,假设每个小时的开始时间(1:00 PM,2:00 PM,3:00 PM等)都是正确的.
我尝试以下,但它有一个问题,我第一次必须在开始时运行程序,然后这个调度程序将重复.
scheduledexecutorservice scheduler = Executors.newSingleThreadScheduledExecutor(); scheduler.scheduleWithFixedDelay(new MyTask(),1,TimeUnit.HOURS);
任何建议重复我的任务,不管我运行程序？
问候,
伊姆兰
解决方法
我也建议
Quartz这个.但是,上述代码可以使用initialDelay参数在小时开始时运行.
Calendar calendar = Calendar.getInstance();
scheduledexecutorservice scheduler = Executors.newSingleThreadScheduledExecutor();
scheduler.scheduleAtFixedrate(new MyTask(),millisToNextHour(calendar),60*60*1000,TimeUnit.MILLISECONDS);
private static long millisToNextHour(Calendar calendar) {
int minutes = calendar.get(Calendar.MINUTE);
int seconds = calendar.get(Calendar.SECOND);
int millis = calendar.get(Calendar.MILLISECOND);
int minutesToNextHour = 60 - minutes;
int secondsToNextHour = 60 - seconds;
int millisToNextHour = 1000 - millis;
return minutesToNextHour*60*1000 + secondsToNextHour*1000 + millisToNextHour;
}