这个 cronExpression 正确吗？

发布于 2024-10-08 00:30:57 字数 212 浏览 10 评论 0原文

我不知道下面的表达式是否正确：

<property name="cronExpression" value="0  0  12  2  *  MON-FRI ?"/>

我尝试将触发器配置为每月的第二天触发，无论年份，在中午，并且一周中的某一天必须在星期一和星期五之间。

如果有人能帮助我，我将非常感激。提前致谢。

原文

I don't know if the below expression is correct:

<property name="cronExpression" value="0  0  12  2  *  MON-FRI ?"/>

I try to configure my trigger to fire every second day of every month, no matter the year, at noon, and the day of week has to be between Monday and Friday.

I'd really appreciate if someone could help me. Thanks in advance.

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枫林﹌晚霞¤ 2024-10-15 00:30:57

我假设您的意思是“每隔一天（每隔一天），只要是周一至周五”。

根据 Quartz CronTrigger 教程：

日期字段中的“1/3”表示“从开始每 3 天触发一次”
该月的第一天”。

因此，1/2 表示“从该月的第一天开始每隔一天触发一次”。类似于 0 0 12 1/2 * 的 cronExpression然后，MON-FRI * 应该接近您想要的内容。使用

org.quartz.CronExpression.isValidExpression("0  0  12  1/2 * MON-FRI *")

... 检查表明该表达式是有效的，

但是，使用以下命令进一步测试它：

CronExpression e = new CronExpression("0  0  12  1/2 * MON-FRI *");
e.isSatisfiedBy(new DateTime(2012, 9, 26, 12, 0, 0, 0).toDate());

... 抛出一个错误。例外：

> Exception in thread "main" java.lang.UnsupportedOperationException:
> Support for specifying both a day-of-week AND a day-of-month parameter
> is not implemented.

所以，似乎jhouse 是对的，而你不能用 cronExpression 做到这一点。

也许这样的方法可以作为解决方法：每 N 小时/天/周/月执行一次的 cron 触发器的 Quartz cron 表达式

I'm assuming you meant "every second day (every other day), as long as it's MON-FRI".

According to Quartz CronTrigger Tutorial:

'1/3' in the day-of-month field means "fire every 3 days starting on
the first day of the month".

So, 1/2 would mean "fire every second day starting on the first day of the month". A cronExpression like 0 0 12 1/2 * MON-FRI * should then be close to what you want. Checking with

org.quartz.CronExpression.isValidExpression("0  0  12  1/2 * MON-FRI *")

...says that the expression is valid.

However, testing it a little further with:

CronExpression e = new CronExpression("0  0  12  1/2 * MON-FRI *");
e.isSatisfiedBy(new DateTime(2012, 9, 26, 12, 0, 0, 0).toDate());

...throws an exception:

> Exception in thread "main" java.lang.UnsupportedOperationException:
> Support for specifying both a day-of-week AND a day-of-month parameter
> is not implemented.

So, seems like jhouse is right and you just can't do that with a cronExpression.

Maybe something like this would work as a workaround: Quartz cron expression for cron triggers executed every Nth Hour/Day/Week/Month

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