Spring事件框架

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1.定义事件类继承ApplicationEvent抽象类：

import org.springframework.context.ApplicationEvent;public class RegisterEvent extends ApplicationEvent {private static final long serialVersionUID = 1L;String userName;public RegisterEvent(Object source, String msg) {super(source);this.userName = msg;}public String getUserName() {return userName;}}

2.定义监听类实现ApplicationListener接口：

import org.springframework.context.ApplicationListener;import org.springframework.stereotype.Service;@Servicepublic class RegisterAccountSendMailListener implementsApplicationListener<RegisterEvent> {@Overridepublic void onApplicationEvent(RegisterEvent arg0) {System.out.println("发邮件到：" + arg0.userName);}}

3.测试类：

import org.springframework.beans.BeansException;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class RegisterServices {private ApplicationContext context;public void setApplicationContext(ApplicationContext arg0)throws BeansException {this.context = arg0;}public void register() {String username = "大大雄";System.out.println("用户名可以用！");// do something...System.out.println("用户注册成功！");context.publishEvent(new RegisterEvent(this, username));}public static void main(String[] args) {RegisterServices registerServices = new RegisterServices();registerServices.setApplicationContext(new ClassPathXmlApplicationContext("springEvent/applicationContext.xml"));registerServices.register();}}

加载spring配置文件的时候，Spring框架会将所有的listener都加载出来，并把它们放在一个集合中。执行context.publishEvent(new RegisterEvent(this, username));方法是会通过反射找到所有监听了RegisterEvent类的listener，通过循环执行listener.onApplicationEvent(event);方法