安排在24小时间隔 [英] Schedule at 24hrs interval

问题描述

我想知道安排代码的最佳方法。我有一个代码可以生成报告并以24小时的间隔向一组人发送邮件。它是基于控制台的java应用程序。我想知道安排它的最佳方法。有时我可能需要将其更改为12小时间隔。但是，应用程序不会在间隔之间执行任何其他任务。

I want to know the best method to schedule a code. I have a code that generates reports and sends mail to a set of people at interval of 24hrs. Its a console based java application. I want to know the best method to schedule that. Sometimes I may need to change that to 12hrs interval. However the application doesn't perform any other task in between the interval.

推荐答案

这里有一些方法，从最简单到最全面：

Here are few approach, from simplest to most comprehensive:

1. sleep（）：

TimeUnit.HOURS.sleep(24)

这种方法很简单，做工作并睡24小时。实际上它有点复杂，因为报告生成需要一些时间，所以你必须稍微睡一会儿。以下所有解决方案都可以透明地处理。

This approach is very simple, do the work and sleep for 24 hours. Actually it is a bit more complex because the report generation takes some time, so you have to sleep slightly shorter. All solutions below handle this transparently.

java.util.Timer＃scheduleAtFixedRate（） - 简单的内置Java解决方案。

java.util.Timer#scheduleAtFixedRate() - simple, built-in Java solution.

@Scheduled 注释 spring 或 @Schedule 的问题class =post-tagtitle =显示问题标记'ejb'rel =tag> ejb - 更复杂但也更强大，例如接受 cron 表达式：

@Scheduled annotation in spring or @Schedule in ejb - more complex but also more powerful, e.g. accepts cron expressions:

@Scheduled(fixedRate=DateUtils.MILLIS_PER_DAY)
public void generateReport() {
  //...
}

quartz-scheduler - 完整的Java调度程序，具有群集和故障转移，失火处理，完整 cron support et etc.非常全面：

quartz-scheduler - full blown Java scheduler with clustering and fail-over, misfire handling, full cron support, etc. Very comprehensive:

newTrigger().
  withSchedule(
    simpleSchedule().
      withIntervalInHours(24).
      repeatForever()
    ).build();

或

newTrigger().
  withSchedule(
    cronSchedule().
      dailyAtHourAndMinute(17, 30).  //17:30
    ).build();

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