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This article introduces the relevant knowledge of "Spring Integration Quartz Framework Process Detailed Explanation". In the actual case operation process, many people will encounter such difficulties. Next, let Xiaobian lead you to learn how to deal with these situations! I hope you can read carefully and learn something!

1. Introduction to Quartz Framework

Quartz is an open source task scheduling framework written entirely in Java, which controls the running time of jobs by setting job timing rules through triggers. Quartz cluster can bring high availability and scalability to scheduler through failover and load balancing functions. It is mainly used to perform timed tasks, such as sending information regularly, generating reports regularly, and so on.

Key features of Quartz framework:

·Powerful scheduling functions, such as a variety of scheduling methods, can meet a variety of general and special needs; ·Flexible application methods, such as support for task scheduling and multiple combinations of tasks, support for multiple data storage; ·Support for distributed clusters, after being acquired by Terracotta, on the original basis for further transformation.

2. Use of Quartz Framework

2.1 Building environment

org.quartz-scheduler quartz 2.2.32.2 Configure Tasks

2.2 Configure Task Class

package cn.test.manager.job;import java.util.Date;public class MyJob { public void run() { System.out.println("Execute Task Scheduling: "+new Date()); }}

2.3 Integrated Spring

3. Cron expression

For Quartz, when we use it, we mainly focus on two aspects, one is the business of timed tasks, and the other is the Cron expression.

3.1 Format of cron expressions

QuartzCron expressions support up to seven fields

Seconds are 0-59 , - * /min is 0-59 , - * /hour 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#Year No Empty or 1970-2099 , - * /

Week and day cannot be specified at the same time, which means one must be?

3.2 Detailed explanation of special characters

*** STAR **

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

0 * 17 * * ?

Meaning: Trigger fired every minute from 5 p.m. to 5:59 p.m. daily. It stops at 5:59 p.m. because the value 17 is on the small time scale, and at 6 p.m. the hour becomes 18, ignoring the trigger until 5 p.m. the next day. Use the * character when you want the trigger to fire on all valid values of the field.

? question mark

? The sign can only be used on the day and week fields, but not both. Can you think? The character is "I don't care what the value is on this field. "This is different from the asterisk, which indicates each value in the field.? Does not specify a value for the field.

The reason why values cannot be specified on both fields at the same time is difficult to explain or even understand. Basically, assuming you specify values at the same time, meaning becomes ambiguous: consider an expression that has the value 11 in the day field and specifies WED in the week field. So is the trigger to be triggered only on the 11th of every month, which happens to be Wednesday? Or is it triggered every Wednesday on the 11th? The way to remove this ambiguity is not to specify values on both fields at the same time. Just remember that if you specify a value for one of these fields, you must place a? above the other word value.

Example Expression:

0 10,44 14 ? 3 WED

Meaning: Triggers at 2:10 p.m. and 2:44 p.m. every Wednesday in mid-March.

, comma

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

Example Expression:

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

Meaning: Trigger every quarter of an hour.

/slash

Slashes (/) are used for incrementing schedules. We just used commas to indicate increments every 15 minutes, but we could also write 0/15 like this.

Example Expression:

0/15 0/30 * * * ?

Meaning: Trigger every 15 seconds on the hour and half hour.

- Middle line.

A dash (-) is used to specify a range. For example, 3-8 in the small time domain means "3, 4, 5, 6, 7, and 8 points." "Values for fields do not allow rotation, so values like 50-10 are not allowed.

Example Expression:

0 45 3-8 ? * *

Meaning: Trigger is triggered at 3:45 AM to 8:45 AM.

L-letter

L specifies the last value allowed on a field. It is only supported by the day and week domains. When used in the day field, indicates the last day of the month specified in the month field. For example, when JAN is specified on the month field, L on the day field causes trigger to be triggered on January 31. If SEP is on the moon, then L indicates a trigger on September 30. In other words, no matter which month is specified, the trigger is triggered on the last day of the corresponding month.

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

When the letter L is used for the week field, it indicates the last day of the week, which is Saturday (or the number 7). So if you need to trigger at 11:59 p.m. on the last Saturday of each month, you can use the expression 0 59 23 ? * L。

When used in the week field, you can use a number connected to L to represent the last week of the month X. For example, the expression 0 0 12 ? * 2L says trigger is triggered on the last Monday of each month.

Do not use range and list values with L

Although you can use the number of weeks (1-7) with L, you are not allowed to use a range value and a list value with L. This can have unpredictable consequences.

W

The W character represents Mon-Fri and can only be used in the day domain. It is used to specify the weekday closest to the specified day. Most business processes are based on the work week, so the W character can be very important. For example, 15W in the solar domain means "the nearest weekday to the 15th of the month." "If the 15th is a Saturday, then the trigger will trigger on the 14th (Thursday), because the nearest day to the 15th is Monday, which in this case will also be the 17th. W can only be used as a single day in the specified day field and cannot be a range or list value.

#

Characters can only be used in the week field. It is used to specify the day of the week of the month. For example, if you specify a value of 6#3 for the week field, it means the third Friday of the month (6= Friday,#3 means the third week of the month). Another example is 2#1 meaning the first Monday of a month (2= Monday,#1 meaning the first week of the month). Note that if you specify #5 and there is no fifth week in the month, then that month will not trigger.

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