在石英调度程序中每 30 秒执行一次 cron 表达式？

Question

I am using Quartz Scheduler to run my jobs. I want to run my job every thirty seconds. What will be my cron expression for that?

For every one minute, I am using below cron expression:

<cron-expression>0 0/1 * 1/1 * ? *</cron-expression>

What it will be for every thirty seconds?

Answer 1

The first element represents the seconds; to run at second 0 and 30 use the following:

<cron-expression>0/30 0/1 * 1/1 * ? *</cron-expression>

Answer 2

I hope this answer will help you. Please define the cron expression the below

 0/30 * * * * ? *

And then you go this website and test Cron Expression Generator & Explainer - Quartz .

Answer 3

The same effect we can reach (Quartz Spring) using more simpler construction:

0/30 * * * * ? *

The last asterisk we can omit.

0/30 * * * * ?

Quartz scheduler cron trigger documentation 2.x

Answer 4

如果您使用的是 Spring 框架，请使用@PostConstruct注释，然后使用@Scheduled(cron=0 0/15 * 1/1 * ?)来触发 now，now+15min 等等。