Spring 4.2新特性-更简单的Application Event
1.1 Application Event
Spring 4.1的写法请参考10点睛Spring4.1-Application Event
请对比10点睛Spring4.1-Application Event
使用一个
@EventListener取代了实现ApplicationListener接口,使耦合度降低;
1.2 示例
- 包依赖
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.wisely</groupId>
<artifactId>spring4-2</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>spring4-2</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.2.0.RC1</version>
</dependency>
</dependencies><repositories>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>http://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
</project>- 编写自定义的Application Event
package com.wisely.spring4_2.event;
import org.springframework.context.ApplicationEvent;
public class DemoEvent extends ApplicationEvent{
private static final long serialVersionUID = 1L;
private String msg;
public DemoEvent(Object source,String msg) {
super(source);
this.msg = msg;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
}- 编写监听类
package com.wisely.spring4_2.event;
import org.springframework.context.event.EventListener;
import org.springframework.stereotype.Component;
@Component
public class DemoListener {
@EventListener //注意此处
public void handleDemoEvent(DemoEvent event){
System.out.println("我监听到了pulisher发布的message为:"+event.getMsg());
}
}- 测试
package com.wisely.spring4_2.event;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.stereotype.Component;
@Component
public class Main {
public static void main(String[] args) {
AnnotationConfigApplicationContext context =
new AnnotationConfigApplicationContext("com.wisely.spring4_2.event");
Main main =context.getBean(Main.class);
main.pulish(context);
context.close();
}
public void pulish(AnnotationConfigApplicationContext context){
context.publishEvent(new DemoEvent(this, "22"));
}
}输出结果
我监听到了pulisher发布的message为:22