String cron = "0/30 * * * * ?" ; //spring 5.3 以后提供的工具类 //如果是低版本的spring可以使用 CronSequenceGenerator //CronSequenceGenerator cronGenerator = new CronSequenceGenerator(crontab); CronExpression cronExpression = CronExpression . parse ( cron ) ; //下次预计的执行时间 LocalDateTime next1 = cronExpression . next ( LocalDateTime . now ( ) ) ; //下下次预计的执行时间 LocalDateTime next2 = cronExpression . next ( nextFirst ) ; //获取执行间隔 long betweenS = ChronoUnit . SECONDS . between ( next1 , next2 ) ;

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public class CronTest { /** * 根据cron表达式获取执行周期 */ @Test public void getPeriodByCron() { //30s执行一次 String cron = "0/30 * * * * ?"; //spring 5.3 以后提供的工具类 //如果是低版本的spring可以使用 CronSequenceGenerator / String job Cron Express = "xxxxxxxxxx";//此处为 cron 表达式 Cron Expression cron Expression =new Cron Expression(job Cron Express);//导包import org.quartz. Cron Expression; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.List; import org.quartz. Cron Expression; import org.quartz. Cron ScheduleBuilder; import org.quartz.Cr. Date date = new Date(); Cron SequenceGenerator cron SequenceGenerator = new Cron SequenceGenerator("0 */5 * * * ?"); Date time1 = cron SequenceGenerator.next(date);// 下次 执行 时间 Date time2 = c. public static void calculate Cron TimeInterval(String corn) { if (StringUtils.isBlank(corn)){ throw new IllegalArgumentException("参数不能为空"); 日期（或可以转换为日期的内容） const cron match = require ( ' cron match' ) // If the minute of the current time is divisible by 5, do something if ( cron match . match ( '*/5 * * * *' , Date . now ( ) ) ) { // Execute the following code only on a wednesday or on the 29 of February if ( cron match . match ( [ '* * * * * 3 *' , '* * * 29 2 *