quartz 执行时间配置

Cron expressions are powerful, but can be pretty confusing. This tutorial aims to take some of the mystery out ofcreating a cron expression, giving users a resource which they can visit before having to ask in a forum or mailinglist.

Format

A cron expression is a string comprised of 6 or 7 fields separated by white space. Fields can contain any of theallowed values, along with various combinations of the allowed special characters for that field. The fields are asfollows:

Field Name Mandatory Allowed Values Allowed Special Characters SecondsYES0-59, - * /MinutesYES0-59, - * /HoursYES0-23, - * /Day of monthYES1-31, - * ? / L W
MonthYES1-12 or JAN-DEC, - * /Day of weekYES1-7 or SUN-SAT, - * ? / L #YearNOempty, 1970-2099, - * /

So cron expressions can be as simple as this: * * * * ? *

or more complex, like this: 0/5 14,18,3-39,52 * ? JAN,MAR,SEP MON-FRI 2002-2010

Special characters

* ("all values") - used to select all values within a field. For example, ""in the minute field means *"every minute".

? ("no specific value") - useful when you need to specify something in one of thetwo fields in which the character is allowed, but not the other. For example, if I want my trigger to fire on aparticular day of the month (say, the 10th), but don't care what day of the week that happens to be, I would put"10" in the day-of-month field, and "?" in the day-of-week field. See the examples below for clarification.

- - used to specify ranges. For example, "10-12" in the hour field means "thehours 10, 11 and 12".

, - used to specify additional values. For example, "MON,WED,FRI" in the day-of-weekfield means "the days Monday, Wednesday, and Friday".

/ - used to specify increments. For example, "0/15" in the seconds field means "theseconds 0, 15, 30, and 45". And "5/15" in the seconds field means "the seconds 5, 20, 35, and 50". You canalso specify '/' after the '' character - in this case '' is equivalent to having '0' before the '/'. '1/3'in the day-of-month field means "fire every 3 days starting on the first day of the month".

L ("last") - has different meaning in each of the two fields in which it isallowed. For example, the value "L" in the day-of-month field means "the last day of the month" - day31 for January, day 28 for February on non-leap years. If used in the day-of-week field by itself, it simply means"7" or "SAT". But if used in the day-of-week field after another value, it means "the last xxx day of themonth" - for example "6L" means "the last friday of the month". You can also specify an offset from the last day of the month, such as "L-3" which would mean the third-to-last day of the calendar month. When using the 'L' option, it is important not to specify lists, or ranges of values, as you'll get confusing/unexpected results.

W ("weekday") - used to specify the weekday (Monday-Friday) nearest the given day.As an example, if you were to specify "15W" as the value for the day-of-month field, the meaning is: "thenearest weekday to the 15th of the month". So if the 15th is a Saturday, the trigger will fire on Friday the 14th.If the 15th is a Sunday, the trigger will fire on Monday the 16th. If the 15th is a Tuesday, then it will fire onTuesday the 15th. However if you specify "1W" as the value for day-of-month, and the 1st is a Saturday, the triggerwill fire on Monday the 3rd, as it will not 'jump' over the boundary of a month's days. The 'W' character can onlybe specified when the day-of-month is a single day, not a range or list of days.

The 'L' and 'W' characters can also be combined in the day-of-month field to yield 'LW', which translates to *"last weekday of the month"*.

# - used to specify "the nth" XXX day of the month. For example, the value of "6#3"in the day-of-week field means "the third Friday of the month" (day 6 = Friday and "#3" = the 3rd one inthe month). Other examples: "2#1" = the first Monday of the month and "4#5" = the fifth Wednesday of the month. Notethat if you specify "#5" and there is not 5 of the given day-of-week in the month, then no firing will occur thatmonth.

The legal characters and the names of months and days of the week are not case sensitive. MON is the same as mon.

Examples

Here are some full examples:

**Expression****Meaning**0 0 12 * * ?Fire at 12pm (noon) every day0 15 10 ? * *Fire at 10:15am every day0 15 10 * * ?Fire at 10:15am every day0 15 10 * * ? *Fire at 10:15am every day0 15 10 * * ? 2005Fire at 10:15am every day during the year 20050 * 14 * * ?Fire every minute starting at 2pm and ending at 2:59pm, every day0 0/5 14 * * ?Fire every 5 minutes starting at 2pm and ending at 2:55pm, every day0 0/5 14,18 * * ?Fire every 5 minutes starting at 2pm and ending at 2:55pm, AND fire every 5 minutes starting at 6pm and ending at 6:55pm, every day0 0-5 14 * * ?Fire every minute starting at 2pm and ending at 2:05pm, every day0 10,44 14 ? 3 WEDFire at 2:10pm and at 2:44pm every Wednesday in the month of March.0 15 10 ? * MON-FRIFire at 10:15am every Monday, Tuesday, Wednesday, Thursday and Friday0 15 10 15 * ?Fire at 10:15am on the 15th day of every month0 15 10 L * ?Fire at 10:15am on the last day of every month0 15 10 L-2 * ?Fire at 10:15am on the 2nd-to-last last day of every month0 15 10 ? * 6LFire at 10:15am on the last Friday of every month0 15 10 ? * 6LFire at 10:15am on the last Friday of every month0 15 10 ? * 6L 2002-2005Fire at 10:15am on every last friday of every month during the years 2002, 2003, 2004 and 20050 15 10 ? * 6#3Fire at 10:15am on the third Friday of every month0 0 12 1/5 * ?Fire at 12pm (noon) every 5 days every month, starting on the first day of the month.0 11 11 11 11 ?Fire every November 11th at 11:11am.

Pay attention to the effects of '?' and '*' in the day-of-week and day-of-month fields!

NotesSupport for specifying both a day-of-week and a day-of-month value is not complete (you must currently usethe '?' character in one of these fields).Be careful when setting fire times between the hours of the morning when "daylight savings" changes occurin your locale (for US locales, this would typically be the hour before and after 2:00 AM - because the timeshift can cause a skip or a repeat depending on whether the time moves back or jumps forward. You may findthis wikipedia entry helpful in determining the specifics to your locale:
https://secure.wikimedia.org/wikipedia/en/wiki/Daylight_saving_time_around_the_world