one. A cron expression has at least 6 (and possibly 7) time elements separated by spaces.
in order of
Seconds (0~59)
minutes (0~59)
hour (0~23)
Day (month) (0~31, but you need to consider the number of days in your month)
Month (0~11)
Day (week) (1~7 1=SUN or SUN, MON, TUE, WED, THU, FRI, SAT)
7. Year (1970-2099)
where each element can be a value (such as 6), a continuous interval (9-12), an interval (8-18/4) (/ means every 4 hours), a List(1,3,5), wildcard. Since the two elements "day of the month" and "day of the week" are mutually exclusive, it is necessary to set one of them?.
two. example
0 0 10,14,16 * * ? Daily 10am, 2pm, 4pm
0 0/30 9-17 * * ? Every half hour during 9 to 5 working hours
0 0 12 ? *WED means each Wednesday at 12:00 PM
"0 0 12 * * ?" Every day at 12:00 PM
"0 15 10 ? * *" Every day at 10:15 AM
"0 15 10 * * ?" Every day at 10:15 AM
"0 15 10 * * ? *" fires
"0 15 10 * * ? 2005" every day at 10:15 am "0 * 14 * * ?" fires
"0 * 14 * * ?" every day from 2 pm to 2:59 pm every day in 2005 Minute trigger "0 0/5 14 * * ?" triggers "0 0/5 14,18 * * ?"
every 5 minutes between 2pm and 2:55pm every day between 2pm and 2:55pm
and triggers "0 0-5 14 * * ?" every 5 minutes between 6pm and 6:55 pm and triggers "0 10,44 14 ? 3 WED"
every 1 minute between 2pm and 2:05pm every day
Trigger "0 15 10 ? *MON-FRI" every March at 2:10pm and 2:44pm on Wednesdays and
10:15am on Mondays to Fridays
" 0 15 10 15 * ?" triggers at 10:15 am on the 15th of every month
"0 15 10 L * ?" triggers at 10:15 am on the last day of every month
"0 15 10 ? * 6L" fires on the last Friday of every month at 10:15 am
"0 15 10 ? * 6L 2002-2005" fires on the last Friday of every month from 2002 to 2005 at 10:15 am
"0 15 10 ? * 6#3" Triggered at 10:15am on the third Friday of every month
1. Some subexpressions can contain ranges or lists
For example: subexpression ( day (week) ) can be "MON-FRI", "MON, WED, FRI", "MON-WED,SAT"
The "*" character represents all possible values. Therefore, "*" in the subexpression ( month ) represents the meaning of each month, and "*" in the subexpression ( day (week) ) represents each day of the week
2. The "/" character is used to specify the increment of the value
For example: "0/15" in the subexpression (minutes) means starting from the 0th minute, every 15 minutes
"3/20" in the subexpression (minutes) means starting from the 3rd minute, every 20 minutes (it has the same meaning as "3, 23, 43")
3. The "?" character is only used for day (month) and day (week) subexpressions, indicating that no value is specified
When one of the two subexpressions is assigned a value, in order to avoid conflicts, the value of the other subexpression needs to be set to "?"
4. The "L" character is only used for day (month) and day (week) subexpressions, it is an abbreviation for the word "last"
But its meaning is different in the two subexpressions.
In the day (month) subexpression, "L" represents the last day of the month
In the day (week) self-expression, "L" represents the last day of the week, which is SAT
If there is specific content before the "L", it has other meanings
For example: "6L" means the 6th last day of the month, "FRIL" means the last Friday of the month
Note: When using the "L" parameter, do not specify a list or range as this can cause problems
three. Notes
Field Allowed Values Allowed Special Characters
秒 |
0-59 |
, - * / |
||
分 |
0-59 |
, - * / |
||
小时 |
0-23 |
, - * / |
||
日期 |
1-31 |
, - * ? / L W C |
||
月份 |
1-12 或者 JAN-DEC |
, - * / |
||
星期 |
1-7 或者 SUN-SAT |
, - * ? / L C # |
||
年（可选） |
留空, 1970-2099 |
, - * / |