parser cron exp

  CronTrigger cronTrigger = new CronTrigger("* 0/2 * * * * ");

    SimpleTriggerContext triggerContext = new SimpleTriggerContext();
    triggerContext.update(new Date(System.currentTimeMillis()),new Date(System.currentTimeMillis()+10),
        new Date(System.currentTimeMillis()+100));
    Date date = cronTrigger.nextExecutionTime(triggerContext);
    System.out.println(date);