问题
I'm using quartz in my web application (Servlet web app) following is snap of quartz.property file and the quartz.job.xml
quartz.property
#===================================================
# Configure the Job Initialization Plugin
#===================================================
org.quartz.plugin.jobInitializer.class = org.quartz.plugins.xml.XMLSchedulingDataProcessorPlugin
org.quartz.plugin.jobInitializer.fileNames = jobs.xml
org.quartz.plugin.jobInitializer.failOnFileNotFound = true
org.quartz.plugin.jobInitializer.scanInterval = 10
org.quartz.plugin.jobInitializer.wrapInUserTransaction = false
<?xml version='1.0' encoding='utf-8'?>
<job-scheduling-data xmlns="http://www.quartz-scheduler.org/xml/JobSchedulingData"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.quartz-scheduler.org/xml/JobSchedulingData http://www.quartz-scheduler.org/xml/job_scheduling_data_1_8.xsd"
version="1.8">
<schedule>
<job>
<name>my-very-clever-job</name>
<group>MYJOB_GROUP</group>
<description>The job description</description>
<job-class>com.acme.scheduler.job.ReportJob</job-class>
</job>
<trigger>
<cron>
<name>my-trigger</name>
<group>MYTRIGGER_GROUP</group>
<job-name>my-very-clever-job</job-name>
<job-group>MYJOB_GROUP</job-group>
<!-- trigger every night at 4:30 am -->
<cron-expression>0 30 4 * * ?</cron-expression>
</cron>
</trigger>
</schedule>
</job-scheduling-data>
Every thing work fine,in this order. I need to allow user to change the time (cron expression) as the way they want.My question is how do i set the cron expression in dynamically.
回答1:
CronTrigger cronTrigger = (CronTrigger) stdScheduler
.getTrigger(triggerName,triggerGroupName);
CronTrigger newTriggerIns = new CronTrigger();
newTriggerIns.setJobName(cronTrigger.getJobName());
newTriggerIns.setName(triggerName);
newTriggerIns.setCronExpression(newCronExpression);
stdScheduler.rescheduleJob(triggerName,triggerGroupName,newTriggerIns);
In the above, take the existing trigger instance. Create one new trigger instance and set cron expression.
Then reschedule the existing instance with new one.
回答2:
Creating a new Trigger like this doesn't work.
CronTrigger cronTrigger = (CronTrigger) stdScheduler.getTrigger(triggerName,triggerGroupName);
CronTrigger newTriggerIns = new CronTrigger();
newTriggerIns.setJobName(cronTrigger.getJobName());
newTriggerIns.setName(triggerName);
newTriggerIns.setCronExpression(newCronExpression);
stdScheduler.rescheduleJob(triggerName,triggerGroupName,newTriggerIns); //doesn't work
You just have to edit the original trigger like this:
CronTrigger cronTrigger = (CronTrigger) stdScheduler.getTrigger(triggerName,triggerGroupName);
cronTrigger.setCronExpression(newCronExpression);
stdScheduler.rescheduleJob(triggerName,triggerGroupName,cronTrigger);
回答3:
Use Quartz api. Programmatically take this trigger instance, cast it to CronTrigger instance and use it's setCronExpression to put expression dynamically.
来源:https://stackoverflow.com/questions/12208309/need-to-set-the-quartz-cron-expression-dynamically