验证cron表达式在Java中有效 [英] Verifying a cron expression is valid in Java

问题描述

我在使用Quartz编写一个Java调度应用程序。我使用CronTrigger，但是我的cron表达式在计划之前并且基于用户输入而输入到数据库。

I'm writing a scheduling application in Java using Quartz. I'm using the CronTrigger, but my cron expressions are entered into a database before they are scheduled and are based on user input.

有一种方法，我可以验证cron表达式在捕获它们时有效吗？我宁愿这样做，并给用户一个适当的错误消息，等待，直到调度程序运行，我得到一个ParseException当我尝试和创建触发器。

Is there a way I can verify that the cron expressions are valid when I capture them? I'd rather do this and give the user an appropriate error message than wait until the scheduler is run and I get a ParseException when I try and create the trigger. Which could be days after the user inputs the data.

推荐答案

你不能简单地创建一个触发器而不实际执行它吗？你可以简单地给出适当的反馈，以防ParseException异常。如果表达式是好的，则将表达式持久保存到DB。

Can't you simply create a trigger without actually executing it? You could simply give appropriate feedback in case of a ParseException. If the expression is okay, persist the expression to DB.

编辑：或者只是这样：

org.quartz.CronExpression.isValidExpression(expression);

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