事件：
发送事件 ApplicationEventPublisher::publishEvent(ApplicationEvent event)
监听事件方法注解：@EventListener
监听服务启停接口 ApplicationListener
public interface ApplicationListener<E extends ApplicationEvent> extends EventListener {
void onApplicationEvent(E paramE);
},
常用事件：if (applicationEvent instanceof ContextClosedEvent) {
标签：知识点,ApplicationListener,Spring,EventListener,监听,事件,梳理 From： https://www.cnblogs.com/clarino/p/17253300.html