The setting of time expression in spring timer time expression Quartz

Setting-----Corn expression for time expressions in quartz

Time format: <!--s M h d M W (?) y (?)-->, respectively: sec > Min > Hour > Day > Month > Week > year,

Example:

1. When to execute every day:

<value>0 * * </value>: The following is done daily 23:59:00

<value>0 11,12 * *? </value>: Daily 11:01,11:02,11:03; 12:01,12:02,12:03 Sub-task execution

2. How often do you perform:

Summary description:

The time field of a cron expression, in addition to allowing the setting of numeric values, can also use some special characters, providing lists, scopes, wildcards and other functions, as described below:

Asterisk (*): Available in all fields, representing every moment of the corresponding time field, for example, * in the minute field, means "per minute";

Question mark (?): This character is used only in date and weekday fields, and it is usually specified as "meaningless value", which is equivalent to a dot character;

Minus sign (-): expresses a range, such as the use of "10-12" in the hour field, that is, from 10 to 12 points, that is, 10,11,12;

Comma (,): Expresses a list value, such as "Mon,wed,fri" in the day of the week field, that is, Monday, Wednesday, and Friday;

Slash (/): The X/y expression is a sequence of equal steps, the value is the start, and Y is the increment step value. If you use 0/15 in the minute field, it is expressed as 0,15,30 and 45 seconds, and 5/15 in the minute field represents 5,20,35,50, you can also use */y, which is equivalent to 0/y;

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The format of the Quartz cron expression is very similar to that of the UNIX cron format, but there is still a little obvious difference. One of the differences is that the Quartz format supports scheduling down to the second level, while the UNIX cron program only supports up to minute levels. Many of our trigger plans are based on a second-level increment (for example, every 45 seconds), so this is a very good difference.

In UNIX Cron, the job (or command) to be executed is stored in a cron expression, at the sixth domain location. Quartz uses cron expressions to store execution plans. A crontrigger that references a cron expression is associated with the job at the scheduled time.

Another difference from the UNIX cron expression is the number of domains that are supported in an expression. UNIX gives five domains (minutes, hours, days, months, and weeks), and Quartz provides seven domains. Table 5.1 lists the seven domains supported by the Quartz cron expression.

Table 5.1. Quartz Cron expressions support to seven domains

Name	Whether you must	Allowed values	Special characters
Seconds	Is	0-59	, - * /
Score of	Is	0-59	, - * /
When	Is	0-23	, - * /
Day	Is	1-31	, - * ? /L W C
Month	Is	1-12 or Jan-dec	, - * /
Week	Is	1-7 or Sun-sat	, - * ? /L C #
Years	Whether	Empty or 1970-2099	, - * /

The names of the month and week are case insensitive. FRI and FRI are the same.

There are spaces between fields, which is the same as UNIX cron. It is indisputable that the simplest expression that we can write looks like this:

* * * ? * *

This expression fires a deployed job every second (every minute, every hour, every day).

• Understanding special characters

Like UNIX cron, Quartz cron expressions support the creation of more complex execution plans with special characters. However, Quartz is richer in support of special characters than standard UNIX cron expressions.

* Asterisk

Use an asterisk (*) to indicate that you want to include all valid values on this domain. For example, using an asterisk on a month field means that the trigger is triggered every month.

Examples of expression patterns:

0 * 17 * *?

Meaning: Trigger is fired every minute from 5 o'clock in the afternoon to 5:59 each day. It stops at 5:59 because the value 17 is on the hour field, and at 6 o'clock in the afternoon, the hour becomes 18, and the trigger is no longer heeded until the next day of 5 o'clock in the afternoon.

Use the * character when you want trigger to be fired on all valid values for that domain.

? Question mark

? Can only be used on day and week fields, but cannot be used concurrently on both domains. Can you think? The character is "I don't care what the value is on that field." "This differs from the asterisk, which indicates each value on the field." Is that you do not specify a value for the field.

The reason why a value cannot be specified at the same time on both domains is difficult to interpret or even incomprehensible. Basically, assuming that you specify a value at the same time, the meaning becomes ambiguous: consider if an expression has a value of 11 on the day field and wed is specified on the domain. So it is to be trigger only in the 11th of each month, and is exactly the day of Wednesday was excited. or the number 11th in every Wednesday. The way to remove this ambiguity is that you cannot specify values on both domains at the same time.

Just remember that if you specify a value for one of the two fields, you have to put one on the other word value.

Examples of expression patterns:

0 10,44 14? 3 WEB

Meaning: Every Wednesday 2:10 and 2:44 in March is triggered.

, comma

A comma (,) is used to specify a list of values on a domain. For example, using the value 0,15,30,45 on the second field means that a trigger is triggered every 15 seconds.

Examples of expression patterns:

0 0,15,30,45 * * *?

Meaning: The trigger is triggered once per quarter.

/Slash

The slash (/) is used for the increment of the timesheet. We've just used a comma to indicate a 15-minute increment, but we can also write this 0/15.

Examples of expression patterns:

0/15 0/30 * * *?

Meaning: Trigger trigger every 15 seconds at the hour and the slightest.

-Medium Dash

A medium dash (-) is used to specify a range. For example, 3-8 on the hour field means "3,4,5,6,7 and 8 points." "The value of the domain does not allow a rollback, so a value like 50-10 is not allowed.

Examples of expression patterns:

0 45 3-8? * *

Meaning: 3 points in the morning to 8 points in the morning of 45 ticks trigger trigger.

L Letter

L describes the last value allowed on a domain. It is supported only by the day and week fields. When used on a day field, represents the last day of the month specified on the month field. For example, when Jan is specified on the current month field, L on the Japanese field will cause trigger to be triggered on January 31. If the monthly field is Sep, then L will indicate a trigger on September 30. In other words, the trigger is triggered on the last day of the corresponding month, regardless of the month specified.

Expression 0 0 8 L *? The meaning is to trigger trigger at 8:00 on the last day of each month. The * description on the month field is "every month".

When the L letter is used on the field, the last day of the week is indicated, that is, Saturday (or the number 7). So if you need 11:59 trigger trigger in the last Saturday of the month, can you use such expressions 0 59 23? L

When used on a week field, you can use a number to connect with L to represent the last one weeks of the month X. For example, an expression 0 0 12? * 2L is said to trigger trigger at the last one weeks of each month.

Do not allow range and list values to be associated with L Although you can use the days of the week (1-7) with L, you are not allowed to use a range value and a list value with L. This can produce unpredictable results.

W Letter

The W character represents weekdays (MON-FRI) and can only be used in the day domain. It is used to specify the most recent weekday from the specified day. Most of the business process is based on the work week, so the W character may be very important. For example, 15W in the daily field means "the most recent weekday of the month 15th." "If number 15th is Saturday, then trigger will be triggered at 14th (Friday), because Thursday is closer to 15th than in Monday (this is number 17th). (Translator Unmi Note: Will not be triggered at number 17th, if it is 15W, may be 14th (15th is Saturday) or 15th (15th is Sunday) triggered, that is, can only appear in the adjacent day, if the day of the 15th is weekday directly on the day of execution). W can only be used in the specified day field as a single day and cannot be a range or list value.

# Number of Wells

The # character can only be used in the field of the week. It is used to specify which day of the week of the month. For example, if you specify the value of the week field as 6#3, it means the third Friday of the month (6= Friday, #3意味着月份中的第三周). Another example 2#1 meaning is the first Monday of the month (2= Monday, #1意味着月份中的第一周). Note that if you specify # #, but there is no 5th week in the month, then the month does not trigger.

The Cron expression Cookbook here is designed to provide scenarios for common execution requirements. Although it is not possible to enumerate all the expressions, the following should provide sufficient examples to meet your business needs.

• Cron Expressions for minutes

Table 5.1: Task Scheduler Cron expressions with minute frequency

Usage	An expression
Daily trigger per minute from 5:00pm to 5:59 pm	0 * 17 * *?
Triggers every five minutes from 11:00am to 11:55 pm per day	0 0/5 23 * *?
Every five minutes from 3:00 to 3:55 pm and 6:00pm to 6:55 pm per day	0 0/5 15,18 * *?
Daily trigger per minute from 5:00pm to 5:05 am	0 0-5 5 * *?

• Cron expressions on the day

Table 5.2. Cron expression on a task plan based on daily frequency

Usage	An expression
Every day, I AM	0 0 3 * *?
Everyday of the day (another way)	0 0 3? * *
Daily 12:00pm (Noon)	0 0 12 * *?
10:15 AM per day in 2005	0 15 10 * *? 2005

• Cron expressions for week and month

table 5.3. Cron expressions on task schedules based on weekly and/or monthly frequency

Usage	An expression
In every Monday, two, three and Thursday of 10:15 AM	0 15 10? * Mon-fri
10:15 AM, number 15th per month.	0 15 10 15 *?
10:15 AM on the last day of the month	0 L *?
10:15 AM in the last Friday of the month	0 15 10? * 6L
In the 2002, 2003, 2004, and 2005 months of the month of the last Friday 10:15 AM	0 15 10? * 6L 2002-2005
10:15 AM, third Friday per month	0 15 10? * 6#3
Every five days (noon) per month from the first day	0 0 12 1/5 *?
Every November 11 11:11 AM	0 11 11 11 11?
March 2:10 pm and 2:44 pm for each Wednesday	0 10,44 14? 3 WED

Eight. Create an instant-triggered Trigger

Sometimes, you need to execute a job immediately. For example, imagine that you are building a GUI program and allowing users to execute it immediately. In another example, you may have detected that a JOB has not been executed successfully, so you want to run it again at once. In Quartz 1.5, several methods were added to the Triggerutils class, making it easy to implement those things. Code 5.4 shows how to deploy a job and just let it execute immediately.

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Fields   allowed values   allowed special characters       seconds  0-59 , - * /        0-59 , - * /      hour  0-23   - * /      Date  1-31 , - * ? / l  W C      month  1-12  or  jan-dec , - * /       Week  1-7  or  SUN-SAT , - * ? / L  c #      year (optional)   empty, 1970-2099 , - * /       expression meaning       "0 0 12 * * ?"   12 O'Clock Noon trigger       "0 15 10 ? * *"   10:15 per day        "0&NBSP;15&NBSP;10&NBSP;*&NBSP;*&NBSP;?"   Daily 10:15 trigger       "0 15 10 * *  * "  Daily 10:15 trigger      " 0 15 10 * * ? 2005 "  2005 daily 10:15 Trigger       "0&NBSP;*&NBSP;14&NBSP;*&NBSP;*&NBSP;?"   Every 1 minutes from 2 o'clock in the afternoon to 2:59 daily to trigger       "0&NBSP;0/5&NBSP;14&NBSP;*&NBSP;*&NBSP;?"   every 5 minutes from 2 o'clock in the afternoon to 2:55 daily to trigger       "0&NBSP;0/5&NBSP;14,18&NBSP;*&NBSP;*&NBSP;?"   every 5 minutes from 2 o'clock in the afternoon to 2:55 daily and 6 o'clock in the afternoon to 6:55       "0&NBSP;0-5&NBSP;14&NBSP;*&NBSP;*&NBSP;?"   Every 1 minutes from 2 o'clock in the afternoon to 2:05 daily       "0 10,44 14 ? 3 wed"   March Wednesday 2:10 and 2:44 trigger       "0 15 10 ? * mon-fri"   Monday to Friday 10:15 trigger       "0&NBSP;15&NBSP;10&NBSP;15&NBSP;*&NBSP;?"   10:15 each month, 15th, the trigger       "0&NBSP;15&NBSP;10&NBSP;L&NBSP;*&NBSP;?"   10:15 trigger on the last day of the month       "0 15 10 ? *&nbsp6L "  Monthly last Friday 10:15 trigger      " 0 15 10 ? * 6l  2002-2005 " 2002 year to 2005 of the last Friday 10:15 trigger      " 0 15 10 ? *  6#3 "  Monthly third Friday 10:15 trigger       every morning 6 points       0 6  * * *      every two hours       0 */2 * *  *      11 o'clock to 8 a.m. every two hours, eight points in the morning       0 23-7/2,8  * * *     , 4th per month and Monday to Sunday, three a.m., 11       0 11.  4 * 1-3      January 1 morning 4       0 4 1  1 *         Some sub-expressions can contain ranges or lists      For example: subexpression (Day (week)) can be   "Mon-fri", "Mon,wed,fri", "Mon-wed,sat"         "*": characters represent all possible values    &nBsp Therefore, "*" in the sub-expression (month) represents the meaning of each month, "*" in the subexpression (Day (week)) represents the day of the week         "/": Character used to specify the increment of numeric value