CronExpression [Quartz Cron]

http://www.quartzscheduler.org/quartz/tutorial.html#cronTriggers

http://www.zilverline.org/zilverlineweb/space/scheduling

Cron Expressions

cronExpression 예제
  1 Seconds (0–59)
  2 Minutes (0–59)
  3 Hours (0–23)
  4 Day of month (1–31)
  5 Month (1–12 or JAN–DEC)
  6 Day of week (1–7 or SUN–SAT)
  7 Year (1970–2099)
  * all
  ? 설정않함.


0 0 10 * * ?
   매일 오전 10시에 실행

0 0 10 1 * ?
   매월 1일 오전 10시에 실행

0 0 10 ? ? 1 ?
  매주 일요일 오전 10시에 실행

Cron-Expressionsare used to configure instances ofCronTrigger. Cron-Expressions are strings that are actually made up of six sub-expressions, that describe individual details of the schedule. These sub-expression are separated with white-space, and represent:

• Seconds
• Minutes
• Hours
• Day-of-Month
• Month
• Day-of-Week

CronTrigger Example 1 - an expression to create a trigger that simply fires every 5 minutes

"0 0/5 * * * ?"

CronTrigger Example 2 - an expression to create a trigger that fires every 5 minutes, at 10 seconds after the minute (i.e. 10:00:10 am, 10:05:10 am, etc.).

"10 0/5 * * * ?"

CronTrigger Example 3 - an expression to create a trigger that fires at 10:30, 11:30, 12:30, and 13:30, on every Wednesday and Friday.

"0 30 10-13 ? * WED,FRI"

CronTrigger Example 4 - an expression to create a trigger that fires every half hour between the hours of 8 am and 10 am on the 5th and 20th of every month. Note that the trigger will NOT fire at 10:00 am, just at 8:00, 8:30, 9:00 and 9:30

"0 0/30 8-9 5,20 * ?"

Note that some scheduling requirements are too complicated to express with a single trigger - such as "every 5 minutes between 9:00 am and 10:00 am, and every 20 minutes between 1:00 pm and 10:00 pm". The solution in this scenario is to simply create two triggers, and register both of them to run the same job.