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Java: Quartz Cron Expression checker

August 17, 2012August 17, 2012 | Huseyin OZVERENHuseyin OZVEREN | 0 Comment | 12:01 AM

A mini-post to expose a simple method to check the Quartz cron expression:

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01public static void testCronExpression(String expression) throws Throwable  {
02    CronExpression cronExpression = new CronExpression(expression);
03    Date d1 = cronExpression.getNextValidTimeAfter(new Date());
04    int i=0;
05    while(i<=100) {
06        System.out.println(d1);
07        d1 = cronExpression.getNextValidTimeAfter(d1);
08        i++;
09    }
10}

Example 1:

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1testCronExpression("0 0/5 8-19 ? * 2,3,4,5,6");

The result in the console could be:

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1Thu Aug 16 10:55:00 CEST 2012
2Thu Aug 16 11:00:00 CEST 2012
3Thu Aug 16 11:05:00 CEST 2012
4Thu Aug 16 11:10:00 CEST 2012
5Thu Aug 16 11:15:00 CEST 2012
6Thu Aug 16 11:20:00 CEST 2012
7...
8Fri Aug 17 15:30:00 CEST 2012
9Fri Aug 17 15:35:00 CEST 2012

Example 2:

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1testCronExpression("0 32 10,13,16 ? * MON,TUE,WED,THU");

The result in the console could be:

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print?
01Thu Aug 16 13:32:00 CEST 2012
02Thu Aug 16 16:32:00 CEST 2012
03Mon Aug 20 10:32:00 CEST 2012
04Mon Aug 20 13:32:00 CEST 2012
05Mon Aug 20 16:32:00 CEST 2012
06...
07Thu Oct 11 16:32:00 CEST 2012
08Mon Oct 15 10:32:00 CEST 2012
09Mon Oct 15 13:32:00 CEST 2012
10Mon Oct 15 16:32:00 CEST 2012

Example 3:

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1testCronExpression("0 0/5 7-19 ? * 2,3,4,5,6");

The result in the console could be:

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print?
01Thu Aug 16 11:05:00 CEST 2012
02Thu Aug 16 11:10:00 CEST 2012
03Thu Aug 16 11:15:00 CEST 2012
04Thu Aug 16 11:20:00 CEST 2012
05Thu Aug 16 11:25:00 CEST 2012
06Thu Aug 16 11:30:00 CEST 2012
07...
08Thu Aug 16 18:55:00 CEST 2012
09Thu Aug 16 19:00:00 CEST 2012
10Thu Aug 16 19:05:00 CEST 2012
11Thu Aug 16 19:10:00 CEST 2012
12Thu Aug 16 19:15:00 CEST 2012
13Thu Aug 16 19:20:00 CEST 2012
14Thu Aug 16 19:25:00 CEST 2012

Note: This method uses the quartz-1.6.0.jar version.

That’s all!!!

Huseyin OZVEREN

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