10.1 Application Event
- Spring使用Application Event给bean之间的消息通讯提供了手段
- 应按照如下部分实现bean之间的消息通讯
- 继承ApplicationEvent类实现自己的事件
- 实现继承ApplicationListener接口实现监听事件
- 使用ApplicationContext发布消息
10.2示例
示例中的通讯两个bean分别为DemoListener和Main
10.2.1 编写自定义的Application Event
package com.wisely.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;
}
}
10.2.2 编写实现ApplicationListener的类
package com.wisely.event;
import org.springframework.context.ApplicationListener;
import org.springframework.stereotype.Component;
@Component
public class DemoListener implements ApplicationListener<DemoEvent> {
public void onApplicationEvent(DemoEvent event) {
String msg = ((DemoEvent) event).getMsg();
System.out.println("我监听到了pulisher发布的message为:"+msg);
}
}
10.2.3 测试
package com.wisely.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.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