动态改变Quartz的调度时间（2）

在动态改变Quartz的调度时间（1）中，使用删除Job然后重新加载实现动态改变调度周期，今天，我自己仔细看了下Quartz的API，发现用另一个方法可以实现这个功能。

版本：

1.8.6

相关链接：

API：http://quartz-scheduler.org/api/1.8.0/ 

http://quartz-scheduler.org/documentation/quartz-1.x/cookbook/UpdateTrigger

相关方法：

rescheduleJob

Date rescheduleJob(String triggerName,
                   String groupName,
                   Trigger newTrigger)
                   throws SchedulerException

Remove (delete) the Trigger with the given name, and store the new given one - which must be associated with the same job (the new trigger must have the job name & group specified) - however, the new trigger need not have the same name as the old trigger.

（删除给定名称的触发器，并且保存新的触发器，新旧触发器的名字相不相同无所谓的。）

Parameters:

triggerName - The name of the Trigger to be replaced.（要替换的触发器的名字）

groupName - The group name of the Trigger to be replaced.（要替换的触发器所在组的名称）

newTrigger - The new Trigger to be stored.（新触发器）

Returns:

null if a Trigger with the given name & group was not found and removed from the store, otherwise the first fire time of the newly scheduled trigger.

Throws:

SchedulerException

具体代码：

/**
	 * 动态修改任务的执行周期
	 * @param jobName 任务名称
	 * @param time 执行周期
	 * @throws SchedulerException
	 * @throws ParseException
	 */
	public static boolean modifyJobTime(String jobName, String time) throws SchedulerException, ParseException{
		
		boolean flag = false;
		
		Scheduler sched = sf.getScheduler();
	
		JobDetail jobDetail = sched.getJobDetail(jobName, JOB_GROUP_NAME);
		
		if(jobDetail != null){

			Trigger trigger = (CronTrigger)sched.getTrigger(jobDetail.getName(),JOB_TRIGGER_GROUP_NAME);

			if(trigger != null){
				CronTrigger ctrigger = (CronTrigger)trigger;
				String timeOld = ctrigger.getCronExpression();
				
				if(!timeOld.equalsIgnoreCase(time)){
					System.out.println("修改任务："+jobName+"now:"+time);
					// 修改Trigger
					ctrigger.setCronExpression(time);
					/**
					 * 更新trigger
					 * sched.rescheduleJob(triggerName, triggerGroupName, newTrigger)
					 */
					sched.rescheduleJob(jobName, JOB_TRIGGER_GROUP_NAME, ctrigger);
					flag = true;
				}
			}
		}
		return flag;
	}

注：sched.rescheduleJob(jobName, JOB_TRIGGER_GROUP_NAME, ctrigger); 此处jobName就是triggerName，值都一样的。