详解spring中的Aware接口功能

package org.company.xxx;
 
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
/**
 * 获取spring容器，以访问容器中定义的其他bean
 */
public class SpringContextUtil implements ApplicationContextAware {
    // Spring应用上下文环境
    private static ApplicationContext applicationContext;
    /**
     * 实现ApplicationContextAware接口的回调方法，设置上下文环境
     */
    public void setApplicationContext(ApplicationContext applicationContext)
            throws BeansException {
        SpringContextUtil.applicationContext = applicationContext;
    }
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
     * 获取对象 这里重写了bean方法，起主要作用
     *
     * @param name
     * @return  Object 一个以所给名字注册的bean的实例
     * @throws BeansException
    public static Object getBean(String beanId) throws BeansException {
        return applicationContext.getBean(beanId);
}

package com.zghw.spring.demo.demo.event;
 
import org.springframework.context.ApplicationEvent;
/**
 * 定义一个发送短信的事件
 * 实现了ApplicationEvent
 * @author zghw
 *
 */
public class SendMessageEvent extends ApplicationEvent {
    private static final long serialVersionUID = 1L;
    //消息对象
    private Message message;
     
    //source代表了发布该事件的发布源
    public SendMessageEvent(Object source,Message message) {
        super(source);
        this.message = message;
    }
    public Message getMessage() {
        return message;
    public void setMessage(Message message) {
}

package com.zghw.spring.demo.demo.event;
 
import org.springframework.context.ApplicationListener;
import org.springframework.stereotype.Component;
/**
 * 发送短信监听器，监听到事件就开始发送。
 * 实现ApplicationListener
 * @author zghw
 *
 */
@Component
public class SendMessageListenter implements ApplicationListener<SendMessageEvent>{
    /**
     * 监听事件SendMessage，当有事件发生则调用该方法
     */
    public void onApplicationEvent(SendMessageEvent event) {
        Message message = event.getMessage();
        String msg=message.getMessage();
        String phone = message.getPhone();
        try {
            System.out.println("开始向手机"+phone+"发送短信，短信内容为："+msg);
            Thread.sleep(1000);
            System.out.println("发送短信成功！");
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

package com.zghw.spring.demo.demo.event;
 
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.context.ApplicationEventPublisherAware;
import org.springframework.stereotype.Service;
/**
 * 实现ApplicationEventPublisherAware让容器ApplicationContext作为事件发布中心，
 * 因为ApplicationContext实现了ApplicationEventPublisher
 * @author zghw
 *
 */
@Service
public class UserService implements ApplicationEventPublisherAware{
    private ApplicationEventPublisher publisher;
     
    public void registerUser(String name,String phone) throws InterruptedException{
        System.out.println("注册用户中");
        Thread.sleep(300);
        System.out.println("注册完成！");
         
        Message message=new Message();
        message.setMessage("你好，"+name+" 你中了1000W");
        message.setPhone(phone);
        SendMessageEvent event=new SendMessageEvent(this,message);
        //发布中心发布事件
        publisher.publishEvent(event);
    }
    /**
     * 实现ApplicationEventPublisherAware的方法，spring在使用时UserServicebean对象时会自动帮我们注入
     * ApplicationEventPublisher的实现
     */
    public void setApplicationEventPublisher(
            ApplicationEventPublisher applicationEventPublisher) {
        this.publisher = applicationEventPublisher;
}