根据Cron表达式获取近几次任务执行时间

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package com.declan;

import java.text.SimpleDateFormat;
import java.util.Date;

import org.quartz.CronExpression;
import org.quartz.CronScheduleBuilder;
import org.quartz.CronTrigger;
import org.quartz.TriggerBuilder;

/**
 * 通过Cron表达式获取近5次的执行时间
 * @author Declan
 *
 */
public class GetScheduleTimeOfCron {
	
	
	public static void main(String[] args) {
		System.out.println(getCronSchdule("1 3 8 * * ?"));
	}
	
	
	 /**
     * 根据Cron表达式获取任务最近5次的执行时间
     * @param cron
     * @return
     */
    public static String getCronSchdule(String cron){
		String timeSchdule="";
		if(!CronExpression.isValidExpression(cron)){
			return "Cron is Illegal!";
		}
		try {
			CronTrigger trigger = TriggerBuilder.newTrigger().withIdentity("Caclulate Date").withSchedule(CronScheduleBuilder.cronSchedule(cron)).build();
			Date time0 = trigger.getStartTime();
			Date time1 = trigger.getFireTimeAfter(time0);
			Date time2 = trigger.getFireTimeAfter(time1);
			Date time3 = trigger.getFireTimeAfter(time2);
			Date time4 = trigger.getFireTimeAfter(time3);
			Date time5 = trigger.getFireTimeAfter(time4);
			SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
			StringBuilder timeBuilder=new StringBuilder();
			timeBuilder
			.append(format.format(time1))
			.append("n")
			.append(format.format(time2))
			.append("n")
			.append(format.format(time3))
			.append("n")
			.append(format.format(time4))
			.append("n")
			.append(format.format(time5));
			timeSchdule=timeBuilder.toString();
		} catch (Exception e) {
			timeSchdule="unKnow Time!";
		}
		return timeSchdule;
	}

  /**
     * 根据Cron表达式获取任务最近 几次的执行时间
     * @param cron  cron表达式
     * @param count 次数
     * @return
     */
    public static List<String> getCronSchdule(String cron, int count){
    	List<String> retList = new ArrayList<String>();
		if(!CronExpression.isValidExpression(cron)){
			//Cron表达式不正确
			return retList;
		}
		try {
			CronTrigger trigger = TriggerBuilder.newTrigger().withIdentity("Caclulate Date").withSchedule(CronScheduleBuilder.cronSchedule(cron)).build();
			SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
			Date startTime = trigger.getStartTime();
			for (int i = 0; i < count; i++) {
				Date time = trigger.getFireTimeAfter(startTime);
				retList.add(format.format(time ));
				startTime = time;
			}
		} catch (Exception e) {
			logger.error("", e);
		}
		return retList;
	}

}

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