學習Nacos原始碼的時候 Nacos的服務變更 服務端會向客戶端主動推送變更資訊,監聽變更而後推送資訊 就是通過Spring Event實現的

-----------------Demo-----------------------------------------------------
@Service
public class TestServeric implements ApplicationContextAware, ApplicationListener<MyApplicationEvenet> {

    ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }

    public void testtestset() {
        this.applicationContext.publishEvent(new MyApplicationEvenet(this, "test"));
    }

    public void pri() {
        System.out.println("執行了");
    }

    @Override
    public void onApplicationEvent(MyApplicationEvenet myApplicationListener) {
        String s = myApplicationListener.getS();
        System.out.println(s);

        TestServeric source = (TestServeric) myApplicationListener.getSource();
        source.pri();
    }

}

------------------------MyApplicationEvent----------

public class MyApplicationEvenet extends ApplicationEvent {
    String s;

    public MyApplicationEvenet(Object source, String s) {
        super(source);
        this.s = s;
    }

    public String getS() {
        return s;
    }
}