10点睛Spring4.1-Application Event

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