1.Spring 自带的
* 计算cron表达式近n次时间-(6段-秒 分 时 日 月 周) * @param cronExpression cron表达式 * @param cronCount 下几次运行时间 * @param maxCronCount 最大执行次数 * @return List<String> @RequestMapping(value = "listCronRunTime") public AjaxResult listCronRunTime( @RequestParam(value = "cronExpression", required = false) String cronExpression, @RequestParam(value = "cronCount", required = false, defaultValue = "1") Integer cronCount, @RequestParam(value = "maxCronCount", required = false, defaultValue = "100") Integer maxCronCount) { if (StringUtils.isBlank(cronExpression)) { return new AjaxResult(-1, "Cron 表达式不能为空!"); if (!CronSequenceGenerator.isValidExpression(cronExpression)) { return new AjaxResult(-1, "Cron格式不正确,Cron：" + cronExpression); if (cronCount < 1) { cronCount = 1; if (maxCronCount < 1) { maxCronCount = 100; if (cronCount > maxCronCount) { cronCount = maxCronCount; CronSequenceGenerator cronSequenceGenerator = new CronSequenceGenerator(cronExpression); List<String> cronTimeList = new ArrayList<>(); Date nextTimePoint = new Date(); SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); for (int i = 0; i < cronCount; i++) { nextTimePoint = cronSequenceGenerator.next(nextTimePoint); cronTimeList.add(sdf.format(nextTimePoint)); return new AjaxResult(cronTimeList);2.第二种 Quartz
首先引入maven依赖或者引入jar(本来就有定时任务的,此步骤省略)
<dependency>
<groupId>org.quartz-scheduler</groupId>
<artifactId>quartz</artifactId>
<version>2.3.0</version>
</dependency>
* @param cronExpression cron表达式
* @param numTimes 下几次运行时间
* @return
public static List<String> getNextExecTime(String cronExpression,Integer numTimes) {
List<String> list = new ArrayList<>();
CronTriggerImpl cronTriggerImpl = new CronTriggerImpl();
try {
cronTriggerImpl.setCronExpression(cronExpression);
} catch(ParseException e) {
e.printStackTrace();
// 这个是重点，一行代码搞定
List<Date> dates = TriggerUtils.computeFireTimes(cronTriggerImpl, null, numTimes);
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
for (Date date : dates) {
list.add(dateFormat.format(date));
return list;
* 最近n次运行时间 Date[]-(7段-秒 分 时 日 月 周 年)
* @param cron 表达式
* @param count 运行次数
public static Date[] getCronScheduledDate(String cron, Integer count) {
if (!CronExpression.isValidExpression(cron)) {
System.out.println("定时任务Cron格式不正确,Cron：" + cron);
return null;
if (count == null || count < 1) {
count = 1;
Date[] dateArray = new Date[count];
CronTrigger trigger = TriggerBuilder.newTrigger().withIdentity("Caclulate Date").withSchedule(CronScheduleBuilder.cronSchedule(cron)).build();
Date time0 = trigger.getStartTime();
Date time1 = trigger.getFireTimeAfter(time0);
dateArray[0] = time1;
if (dateArray.length > 1) {
Date timeTemp = time1;
for (int i = 1; i < dateArray.length; i++) {
timeTemp = trigger.getFireTimeAfter(timeTemp);
if (timeTemp != null) {
dateArray[i] = timeTemp;
} else {
break;
return dateArray;
检验表达式是否正确(spring + quartz)
* 检验表达式是否正确-spring(org.springframework.scheduling.support.CronSequenceGenerator)
* @param cron cron表达式
* @return 正确:true
public static boolean cronValidExpressionFlag(String cron) {
return StringUtils.isNotBlank(cron) && CronSequenceGenerator.isValidExpression(cron);
* 检验表达式是否正确-quartz(org.quartz.CronExpression)
* @param cron cron表达式
* @return 正确:true