如何在Grails中动态更改Quartz CRON表达式

compile 'org.grails.plugins:quartz:2.0.13'

import grails.transaction.Transactional
import org.quartz.CronTrigger
import org.quartz.JobDetail
import org.quartz.Scheduler
import org.quartz.SchedulerFactory
import org.quartz.TriggerKey

@Transactional
class QuartzService {

    def schedulerFactory

    def changeCronExpression(String triggerName, String cronExpression) {
        SchedulerFactory sf = schedulerFactory
        Scheduler scheduler = sf.scheduler

        TriggerKey triggerKey = TriggerKey.triggerKey(triggerName)
        CronTrigger trigger = scheduler.getTrigger(triggerKey) as CronTrigger

        if (trigger != null) {
            trigger.setCronExpression(cronExpression)
            scheduler.rescheduleJob(triggerKey, trigger)
        }
    }
}

class MyController {

    def quartzService

    def updateCronExpression() {
        String triggerName = "myTrigger"
        String cronExpression = "0 0/5 * * * ?" // 新的CRON表达式

        quartzService.changeCronExpression(triggerName, cronExpression)
    }
}