Quartz Job Scheduler

Scheduling: Cron - Quartz scheduler

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CronTrigger used to trigger the Job of Quartz

CronTrigger uses expression to schedule

Exp Syntax: CronTrigger ct=new CronTrigger("cronTrigger","group2","0 0/1 * * * ?");

                                                             " * * * * * ? * "

                                       1. Seconds

                                       2. Minutes

                                       3. Hours

                                       4. Day-of-Month

                                       5. Month

                                       6. Day-of-Week

                                       7. Year (optional field)

All of the fields have a set of valid values that can be specified.

These values should be fairly obvious - such as the numbers 0 to 59 for seconds and minutes, and the values 0 to 23 for hours.

Day-of-Month can be any value 0-31, but you need to be careful about how many days are in a given month!

Months can be specified as values between 0 and 11, or by using the strings JAN, FEB, MAR, APR, MAY, JUN, JUL, AUG, SEP, OCT, NOV and DEC.

Days-of-Week can be specified as values between 1 and 7 (1 = Sunday) or by using the strings SUN, MON, TUE, WED, THU, FRI and SAT.

/ - used to specify increments on value. 0/35 - it means on 35th min of every hour & not every 35 min.

? - used to specify no specific value for the field

L - if given in Day-of-Month means last day of the month or if given in Day-of-Week means last day of the week. u can use this with Day of Week as 'FRIL' it means last friday of the month.

# - used in day of week field as, FRI#3 or 6#3, it means 3rd friday of the month.

* - used in all fields to specify every possible value of the field.

Note: Both day-of-week or day-of-month parameter should not be *. That means any of the parameter should be implemented with specific value not with every possible value of the field

Quartz Jar Download Link - http://quartz-scheduler.org/downloads/catalog

Sample Code:

public class CronTest implements Job{

public static void main(String a[]){

SchedulerFactory sf=new StdSchedulerFactory();          

Scheduler sched = sf.getScheduler();

sched.deleteJob("job","detail");

JobDetail jd=new JobDetail("job","detail",CronTest.class);

JobDataMap dataMap = new JobDataMap();

jd.setJobDataMap(dataMap);

CronTrigger ct=new CronTrigger("cronTrigger","group","0/10 * * ? * *");  sched.scheduleJob(jd,ct);

sched.start();

}

@Override

public void execute(JobExecutionContext arg) {

            // implement your logic here

            // Will be invoked for every 10 seconds, starting from 0th second

}

}