每隔30分钟进行一次 Spring cron 表达

我有以下 Spring 作业每30分钟运行一次。请检查我的 cron 表达式，是否正确？

0 0 0 * * 30

下面是来自相关 Spring 配置文件的完整 cron 作业定义:

<bean id="autoWeblogPingTrigger" class="org.springframework.scheduling.quartz.CronTriggerBean">
<property name="jobDetail" ref="jobDetailForWeblogPing"/>
<!-- run every 35 minutes -->
<property name="cronExpression" value="0 0 0 * * 30" />
</bean>
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According to the Quartz-Scheduler Tutorial It should be value="0 0/30 * * * ?"

The field order of the cronExpression is

  1. Seconds
  2. Minutes
  3. Hours
  4. Day-of-Month
  5. Month
  6. Day-of-Week
  7. Year (optional field)

Ensure you have at least 6 parameters or you will get an error (year is optional).

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最佳答案 
<property name="cronExpression" value="0 0/30 * * * ?" />
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Graphically, the cron syntax for Quarz is (source):

+-------------------- second (0 - 59)
|  +----------------- minute (0 - 59)
|  |  +-------------- hour (0 - 23)
|  |  |  +----------- day of month (1 - 31)
|  |  |  |  +-------- month (1 - 12)
|  |  |  |  |  +----- day of week (0 - 6) (Sunday=0 or 7)
|  |  |  |  |  |  +-- year [optional]
|  |  |  |  |  |  |
*  *  *  *  *  *  * command to be executed

So if you want to run a command every 30 minutes you can say either of these:

0 0/30 * * * * ?
0 0,30 * * * * ?

You can check crontab expressions using either of these:

  • crontab.guru — (disclaimer: I am not related to that page at all, only that I find it very useful). This page uses UNIX style of cron that does not have seconds in it, while Spring does as the first field.
  • Cron Expression Generator & Explainer - Quartz — cron formatter, allowing seconds also.
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In my Java Spring web application, this is what worked for me:

cron="0 0/30 * * * ?"

This will trigger on for example 10:00 AM, then 10:30 AM etc.

Here is a full configuration file:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:beans="http://www.springframework.org/schema/beans"
xmlns:task="http://www.springframework.org/schema/task"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/task
http://www.springframework.org/schema/task/spring-task.xsd">


<beans profile="cron">
<bean id="executorService" class="java.util.concurrent.Executors" factory-method="newFixedThreadPool">
<beans:constructor-arg value="5" />
</bean>


<task:executor id="threadPoolTaskExecutor" pool-size="5" />
<task:annotation-driven executor="executorService" />


<beans:bean id="expireCronJob" class="com.cron.ExpireCron"/>


<task:scheduler id="serverScheduler" pool-size="5"/>
<task:scheduled-tasks scheduler="serverScheduler">
<!-- every thirty minutes -->
<task:scheduled ref="expireCronJob" method="runTask" cron="0 0/30 * * * ?"/>
</task:scheduled-tasks>


</beans>


</beans>

I dont know why but this is working on my local develop and production, but other changes if I made I have to be careful, because it may work local and on develop, but not on production.

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If someone is using @Sceduled this might work for you.

@Scheduled(cron = "${name-of-the-cron:0 0/30 * * * ?}")

This worked for me.


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