Spring shedule Task Annotation implementation (two-time solution to start schedule Task)

The newly introduced task namespace in spring. The quartz feature can be partially replaced, the configuration and API simpler, and annotations are supported.

　　

The first step:

Configure and turn on spring in the relevant configuration file for spring (applicationcontext.xml or {project_name}_servelt.xml or stand-alone configuration file such as Xxx_quartz.xml) Schedule Task. Note that the highlighted part is required.

1 <?XML version= "1.0" encoding= "UTF-8"?> 2 <Beansxmlns= "Http://www.springframework.org/schema/beans" 3 Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance" 4 XMLNS:AOP= "HTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP" 5 Xmlns:tx= "Http://www.springframework.org/schema/tx" 6 Xmlns:context= "Http://www.springframework.org/schema/context" 7 Xmlns:mvc= "Http://www.springframework.org/schema/mvc" 8 xmlns:p= "http://www.springframework.org/schema/p" 9 Xmlns:task= "Http://www.springframework.org/schema/task" Ten xsi:schemalocation="  One Http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/ Spring-beans-3.1.xsd A HTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP http://www.springframework.org/schema/aop/spring-aop-3.1.xsd - http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd - Http://www.springframework.org/schema/context http://www.springframework.org/schema/context/ Spring-context-3.1.xsd the Http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd - Http://www.springframework.org/schema/task - http://www.springframework.org/schema/task/spring-task-3.0.xsd -        ">  +     <Mvc:annotation-driven/>  -     <Context:component-scanBase-package= "Com.mytools.validator.engine" />  +      A     <!--Start Timer -  at     <Task:annotation-driven/>       - </Beans>

Step Two:

You can specify the following annotation in a class that needs to be executed in a timed manner

1 //  2public voidthrows 34       }

Note: In fact, the following 3 kinds of time expressions can be specified in @scheduled:

(1) Fixedrate: This method is executed once every few milliseconds. Such as:

1 @Scheduled (fixedrate=2000)  //2publicvoid  Schedulemethod () {   3     System.out.println ("Hello world ...");    4 }   

(2) Fixeddelay: The method is deferred for a number of milliseconds after the execution of the method is completed.

(3) Cron: Detailed configuration of when the method is executed. The cron value is a cron expression. Such as:

1 @Scheduled (cron= "0 0 0 * * SAT")   2 public voidarchiveoldspittles () {    3    /  /...    4 }

After a specified time, the task always executes 2 times the solution:

This is because it is easy for us to start 2 timed threads in a spring-based Web project:

First: When the Web container starts, it is loaded once when the Applicationcontext.xml (or other spring core configuration file) file is read.

Second time: Spring itself loads the applicationcontext.xml (or other spring core configuration files) at once.

Solution: Separate the relevant configuration of your task and load it through Context-param in Web. Xml. Instead of loading through spring.

1) independent out of Spring-task, such as the new name of a file named Cms_quartz.xml

2) in Web. XML to load the file:

1 <Context-param> 2      <Param-name>Contextconfiglocation</Param-name> 3      <Param-value>/web-inf/cms-servlet.xml, Classpath:cms-quartz.xml</Param-value> 4 </Context-param>

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Spring shedule Task Annotation implementation (two-time solution to start schedule Task)