Question

为了运行后台服务，我想安排一个线程，每天凌晨1点运行。我怎样才能在java中获得这个日期？

Calendar cal = Calendar.getInstance();
cal.set(Calendar.HOUR_OF_DAY, HOUR_OF_EXECUTION);
Date date = cal.getTime();

没用。

Answer 1

你应该去Quartz。

Here is some sample code.

OR

Timer timer = new Timer();
final Callable c = callable;
TimerTask task = new TimerTask() {
    public void run() {
            c.call();
    }
}
t.scheduleAtFixedRate(task, firstExecuteDate, 86400000); // every day

相应地给出firstExecuteDate，你的事情已经完成了，更多的是下次执行 - 现在

获取下午1点的日期。

Calendar cal  = Calendar.getInstance();
Calendar calAtOne  = Calendar.getInstance();
calAtOne.set(Calendar.HOUR_OF_DAY,13);
calAtOne.set(Calendar.MINUTE,00);
calAtOne.set(Calendar.SECOND,00);

if(calAtOne.after(cal)){
    return calAtOne;
}else{
    cal.add(Calendar.DATE,1);
    cal.set(Calendar.HOUR_OF_DAY,13);
    cal.set(Calendar.MINUTE,00);
    cal.set(Calendar.SECOND,00);
    return cal;
}

然后减去currentMillis - (nextExecDate returned By above code)

下次凌晨1点获取日期

1 个答案: