在指定时间内安排Java任务

Question

我希望能够在Java中的特定时间安排任务.我知道ExecutorService有能力定期安排,并在指定的延迟后安排,但我看的时间比一段时间更长.

有没有办法Runnable在2:00 进行执行,或者我是否需要计算从现在到2:00之间的时间,然后安排runnable在延迟后执行？

Answer 1

你也可以使用spring注释

@Scheduled(cron="*/5 * * * * MON-FRI")
public void doSomething() {
// something that should execute on weekdays only
}

http://static.springsource.org/spring/docs/3.0.x/spring-framework-reference/html/scheduling.html

Answer 2

这就是我使用java7SE解决的方法：

    timer = new Timer("Timer", true);
    Calendar cr = Calendar.getInstance(TimeZone.getTimeZone("GMT"));
    cr.setTimeInMillis(System.currentTimeMillis());
    long day = TimeUnit.DAYS.toMillis(1);
    //Pay attention - Calendar.HOUR_OF_DAY for 24h day model 
    //(Calendar.HOUR is 12h model, with p.m. a.m. )
    cr.set(Calendar.HOUR_OF_DAY, it.getHours());
    cr.set(Calendar.MINUTE, it.getMinutes());
    long delay = cr.getTimeInMillis() - System.currentTimeMillis();
    //insurance for case then time of task is before time of schedule
    long adjustedDelay = (delay > 0 ? delay : day + delay);
    timer.scheduleAtFixedRate(new StartReportTimerTask(it), adjustedDelay, day);
    //you can use this schedule instead is sure your time is after current time
    //timer.scheduleAtFixedRate(new StartReportTimerTask(it), cr.getTime(), day);

碰巧比我想的要正确

Answer 3

你会想要Quartz。