每天，每周，每月和每年调用一种方法 [英] Calling a method every Day, every Week , every month and every year

问题描述

我需要在特定时间自动向我的客户发送报告

• 每天凌晨00:01


• 每个星期天的上午00:01


• 在每月的第一天


• 在每年的第一天

我每天都在这样做：

  public void contextInitialized（ServletContextEvent arg0）{
 
 System.out.println（ context initiallized）; 
 System.out.println（启动计时器）; 
 
日历日历= Calendar.getInstance（）; 
 calendar.set（Calendar.HOUR_OF_DAY，0）; 
 calendar.set（Calendar.MINUTE，1）; 
 calendar.set（Calendar.SECOND，0）; 
 
日期AlarmTime = calendar.getTime（）; 
 
 _timer = new Timer（）; 
 _timer.schedule（new AlarmTask（），alarmTime）; 
} 
  

这是我执行日常任务的班级：

 公共类AlarmTask扩展了TimerTask {
 
 public void run（）{
 //在这里工作；现在是00:01！ 
} 
} 
  

但效果很好 当我在凌晨00:01之后任何时候启动tomcat时说在凌晨02:30，任务会在上下文加载后立即执行，而我需要在第二天执行...... b

我的代码有问题吗？

解决方案

日历为整个日期建模，因此您可以安排过去的日期。 Timer 将通过立即执行来响应。在日历上增加一天。

I need to autoSend reports to my clients at perticular timings like

• every day at 00:01 AM
• every Week at Sunday 00:01 AM
• on day 1 of every month
• on day 1 of every year

For every day i am doing this :

public void contextInitialized(ServletContextEvent arg0) {

        System.out.println("context initiallized");
        System.out.println("Starting timer");

        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MINUTE, 1);
        calendar.set(Calendar.SECOND, 0);

        Date alarmTime = calendar.getTime();

        _timer = new Timer();
        _timer.schedule(new AlarmTask(), alarmTime);
    }

Here is the class where i perform my everyday task :

public class AlarmTask extends TimerTask {

    public void run() {
        // Do your work here; it's 00:01 AM!         
    }
}

It seems to work fine BUT when i start tomcat at anytime after 00:01 AM Say at 02:30 AM the task is performed as soon as the context is loaded where i need it to be performed on next day...

Is their any problem with my code ?

解决方案

Calendar models the full date so you have scheduled in the past. Timer will respond to that by executing immediately. Increment the day on the Calendar.

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