private ThreadPoolTaskScheduler threadPoolTaskScheduler;

// 載入時建立定時器
{
	threadPoolTaskScheduler = new ThreadPoolTaskScheduler();
	//初始化，
	threadPoolTaskScheduler.initialize();
}
private ScheduledFuture<?> future;

// 定時器本體 開啟定時器
public void setCron(final String cron) {
	this.cron = cron;
	stopCron();
	future = threadPoolTaskScheduler.schedule(new Runnable() {

		@Override
		public void run() {
			try {
				//自己的 業務

			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}, new Trigger() {
		public Date nextExecutionTime(TriggerContext triggerContext) {
			if ("".equals(cron) || cron == null)
				return null;
			CronTrigger trigger = new CronTrigger(cron);// 定時任務觸發，可修改定時任務的執行週期
			Date nextExecDate = trigger.nextExecutionTime(triggerContext);
			return nextExecDate;
		}

	});

}

// 關閉定時器
public void stopCron() {
	if (future != null) {
		future.cancel(true);
	}
}