springboot整合listener方式一

1. 创建一个项目

2. package com.test;
   
   import org.springframework.boot.SpringApplication;
   import org.springframework.boot.autoconfigure.SpringBootApplication;
   import org.springframework.boot.web.servlet.ServletComponentScan;
   
   @SpringBootApplication
   @ServletComponentScan//会扫描@WebServlet的类并实例化该类
   public class App {
   	public static void main(String[] args) {
   		SpringApplication.run(App.class, args);
   	}
   }
   

    

3. 创建一个listener类

4. package com.test.listener;
   
   import javax.servlet.ServletContextEvent;
   import javax.servlet.ServletContextListener;
   import javax.servlet.annotation.WebListener;
   
   import org.apache.catalina.SessionEvent;
   import org.apache.catalina.SessionListener;
   /***
    * 
    * 		com.test.listener.FirstListener
    * 
    * @author 26920
    *
    */
   @WebListener
   public class FirstListener implements ServletContextListener{
   	@Override
   	public void contextInitialized(ServletContextEvent sce) {
   		// TODO Auto-generated method stub
   		System.out.println("ServletContext初始化完成==========");
   		
   	}
   	@Override
   	public void contextDestroyed(ServletContextEvent sce) {
   		// TODO Auto-generated method stub
   		System.out.println("ServletContxt销毁了============");
   	}
   }
   

    

5. 需要哪个监听器就实现哪个接口