Spring ApplicationEvent 生命周期管理

package com.liuliu.learning;

import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextClosedEvent;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.context.event.ContextStartedEvent;
import org.springframework.context.event.ContextStoppedEvent;
import org.springframework.stereotype.Component;

/**
 * @author liuliu
 */
@Component
public class ApplicationEventListener implements ApplicationListener {

    public void onApplicationEvent(ApplicationEvent event) {
        if (event instanceof ContextClosedEvent) {
            System.out.println("====" + event.getClass().getSimpleName() + " 事件已发生！");
        } else if (event instanceof ContextRefreshedEvent) {
            System.out.println("====" + event.getClass().getSimpleName() + " 事件已发生！");
        } else if (event instanceof ContextStartedEvent) {
            System.out.println("====" + event.getClass().getSimpleName() + " 事件已发生！");
        } else if (event instanceof ContextStoppedEvent) {
            System.out.println("====" + event.getClass().getSimpleName() + " 事件已发生！");
        } else {
            System.out.println("====" + "有其它事件发生:" + event.getClass().getName());
        }
    }
}

输出

` ====ContextRefreshedEvent 事件已发生！` 
` ====有其它事件发生:org.springframework.boot.web.servlet.context.ServletWebServerInitializedEvent` 
` ====有其它事件发生:org.springframework.boot.context.event.ApplicationStartedEvent` 
` ====有其它事件发生:org.springframework.boot.context.event.ApplicationReadyEvent` 
` ====ContextClosedEvent 事件已发生！`