Spring Cloud 笔记之Spring cloud config client

观察者模式它的数据的变化是被动的。

观察者模式在java中的实现：

package com.hxq.springcloud.springcloudconfigclient;

import org.springframework.context.ApplicationListener;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class SpringEventListenerDemo {
    public static void main(String[] args) {
        AnnotationConfigApplicationContext annotationConfigApplicationContext = new AnnotationConfigApplicationContext();

        //注册监听器
        annotationConfigApplicationContext.addApplicationListener(new ApplicationListener<MyApplicationEvent>() {
            /**
             * 监听器得到事件
             * @param applicationEvent
             */
            @Override
            public void onApplicationEvent(MyApplicationEvent applicationEvent) {
                System.out.println("接收到事件："+applicationEvent.getSource());
            }
        });
        annotationConfigApplicationContext.refresh();
        //发布事件
        annotationConfigApplicationContext.publishEvent(new MyApplicationEvent("hello world"));


    }
}

 

来源：https://my.oschina.net/u/3944601/blog/3094196