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 {
    
    public MyApplicationEvent(Object source) {
        super(source);
    }
}

 2.创建事件发送方类

@Component
@Slf4j
public class UserListener {
    @Autowired
    private 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
@Slf4j
public class PersonListener {
    @EventListener
    public void test1(MyApplicationEvent myApplicationEvent){
        log.info("PersonListener!!!");
        UserListener userListener = (UserListener) myApplicationEvent.getSource();
        String username = userListener.getUsername();
        log.info(username);
    }
}

 4.测试

@SpringBootApplication
public 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：