每 N 小时/天/周/月执行的 cron 触发器的 Quartz cron 表达式 [英] Quartz cron expression for cron triggers executed every Nth Hour/Day/Week/Month

问题描述

我正在开发一个应用程序，让用户能够安排一些活动.用户提供的输入是

I am developing an application that gives the user the ability to schedule some activity. Inputs that are provided by user are

1. N 的值
2. 小时/天/周/月之间的选项
3. 开始日期
4. 开始时间

我无法为每个重复间隔类型(即小时/天/周/月)获得正确的 cron 表达式，以便从开始日期开始计算触发时间.

I am unable to get the cron expressions right for each of the repeat interval type i.e. Hour/Day/Week/Month so that the trigger time is calculated from the start date.

推荐答案

Quartz 文档建议使用 SimpleTrigger http://www.quartz-scheduler.org/docs/cookbook/BiDailyTrigger.html，每隔一天举一个例子:

Quartz documentation suggests using a SimpleTrigger http://www.quartz-scheduler.org/docs/cookbook/BiDailyTrigger.html, an example for every other day:

Trigger trigger = new SimpleTrigger("trigger1", "group1");
trigger.setRepeatCount(SimpleTrigger.REPEAT_INDEFINITELY);
// 24 hours * 60(minutes per hour) * 60(seconds per minute) * 1000(milliseconds per second)
trigger.setRepeatInterval(2L * 24L * 60L * 60L * 1000L);

请注意，您需要设置触发开始时间和失火规则.

Note that you will need to set the trigger start time and the misfire rule.

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