Spring基于事件通知的demo

基于事件也是一种解耦的方式，这里简单写了个demo:
1.创建ApplicatonEvent的实现类
public class MyApplicationEvent extends ApplicationEvent {/*** Create a new {@code ApplicationEvent}.** @param source the object on which the event initially occurred or with*which the event is associated (never {@code null})*/public MyApplicationEvent(Object source) {super(source);}}2.创建事件发送方类
@Component@Slf4jpublic class UserListener {@Autowiredprivate ApplicationEventPublisher applicationEventPublisher;private String username;public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public void register(){log.info("UserListener!!!");username = "xiaochen";//发布事件applicationEventPublisher.publishEvent(new MyApplicationEvent(this));}} 3.创建事件接收类
@Component@Slf4jpublic class PersonListener {@EventListenerpublic void test1(MyApplicationEvent myApplicationEvent){log.info("PersonListener!!!");UserListener userListener = (UserListener) myApplicationEvent.getSource();String username = userListener.getUsername();log.info(username);}}4.测试
@SpringBootApplicationpublic class AppStart {public static void main(String[] args) {ConfigurableApplicationContext context = SpringApplication.run(AppStart.class, args);new Thread(()->{for (int i = 0;i < 3;i++){try {Thread.sleep(1000);} catch (InterruptedException e) {e.printStackTrace();}context.getBean(UserListener.class).register();}}).start();}} 输出结果如下：
【Spring基于事件通知的demo】