Spring Task Usage Notes

Because the project needs to do a timed task operation, the knowledge of the previous Contact Java Timer task, the feeling is not very cool, today found that the spring comes with task tasks relatively cool, learning a bit,

First you need to spring3 the above version, support annotations and configuration two forms, I will say the configuration of the form:

1. Add a red section to the spring configuration file

<beans xmlns= "Http://www.springframework.org/schema/beans"
Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance" xmlns:context= "Http://www.springframework.org/schema/context"
Xmlns:mvc= "Http://www.springframework.org/schema/mvc"
xmlns:task= "Http://www.springframework.org/schema/task"
Xsi:schemalocation= "Http://www.springframework.org/schema/beans
Http://www.springframework.org/schema/beans/spring-beans.xsd
Http://www.springframework.org/schema/context
Http://www.springframework.org/schema/context/spring-context-3.2.xsd
Http://www.springframework.org/schema/mvc
Http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
Http://www.springframework.org/schema/task
http://www.springframework.org/schema/task/spring-task-3.0.xsd ">

2. Annotation Scan package <context:component-scan base-package= "Com.lenovo.task"/>

3. Configuring tasks

<task:scheduled-tasks>
<!--<task:scheduled ref= "Taskjob" method= "getaccesstokenjob" cron= "0 27 23/2 * *?" />--
<task:scheduled ref= "Taskjob" method= "Getaccesstokenjob" fixed-rate= "#{1000*60*60*2}"/>
</task:scheduled-tasks>

Note that there are three properties cron,fixed-rate supported, and Fixed-delay

3.1.cron expression Form

Cron expressions I will not say, your own Baidu bar a lot of, but it is note that this way the task execution is a fixed point of time, such as my upper expression is 23:27 execution, and then every 2 hours after the execution, not restart the server, the task immediately executes. Also pay attention to the month, and the week, must have a question mark?

3.2fixed-rate and Fixed-delay the two are executed every several times, in milliseconds. I don't know the difference between the two of them. You know, say something.

The 4.java class is as follows

Package com.lenovo.task;

Import Java.util.Date;

Import Org.springframework.stereotype.Service;

Import com.lenovo.util.Constants;
Import Com.lenovo.util.WxPayHelper;

@Service
public class taskjob{

public void Getaccesstokenjob () {

Wxpayhelper wxpayhelper = new Wxpayhelper ();
Wxpayhelper.setappid (CONSTANTS.APPID);
Wxpayhelper.setappsecret (Constants.secret);
Wxpayhelper.seturl (Constants.accessurl);
System.out.println (constants.accesstoken+ "-----");
System.out.println (constants.jsapi_ticket+ "Nidaye");
System.out.println (New Date ());

try{
Constants.accesstoken = Wxpayhelper.getaccesstoken ();
Constants.jsapi_ticket=wxpayhelper.getjstoken (Constants.accesstoken);
}catch (Exception e) {
E.printstacktrace ();
}

}


}

Spring Task Usage Notes