每N天在一天的特定时间运行任务的计划程序

Question

I am looking for a scheduler which should run at a particular hour in the day for every N specified days.

For example, my task should run at 11PM for every 10 days.

The hour can be configured using cron expression, but how do we set the interval.

Thanks for the help

Answer 1

You can use java.util.concurrent.ScheduledExecutorService

private final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);
scheduler.scheduleAtFixedRate(command, getTonight10PM(), period, unit);

Update: To set the initialDelay, you can set the time in GregorianCalendar as 10 PM and pass it as an argument

private static Date getTonight10PM() {
        Calendar today = new GregorianCalendar();
        Calendar result =
            new GregorianCalendar(today.get(Calendar.YEAR), today.get(Calendar.MONTH), today.get(Calendar.DATE), 23, 0);
        return result.getTime();
}