package com.bjsxt.listener;

import javax.servlet.ServletContextEvent;

import javax.servlet.ServletContextListener;

import javax.servlet.annotation.WebListener;

/**

 * Created by Administrator on 2019/2/5.

 */

@WebListener

public class FirstListener implements ServletContextListener{

    @Override

    public void contextInitialized(ServletContextEvent servletContextEvent) {

        System.out.println("FirstListener初始化......");

    }

    @Override

    public void contextDestroyed(ServletContextEvent servletContextEvent) {

    }

}

package com.bjsxt;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.web.servlet.ServletComponentScan;

/**

 * Created by Administrator on 2019/2/4.

 */

@SpringBootApplication

@ServletComponentScan   //在springboot启动时，会扫描@WebServlet、@WebFilter、@WebListener等，并将该类实例化

public class App {

    public static void main(String[] args){

        SpringApplication.run(App.class,args);

    }

}

package com.bjsxt.listener;

import javax.servlet.ServletContextEvent;

import javax.servlet.ServletContextListener;

import javax.servlet.annotation.WebListener;

/**

 * Created by Administrator on 2019/2/5.

 */

public class SecondListener implements ServletContextListener{

    @Override

    public void contextInitialized(ServletContextEvent servletContextEvent) {

        System.out.println("SecondListener初始化......");

    }

    @Override

    public void contextDestroyed(ServletContextEvent servletContextEvent) {

    }

}

package com.bjsxt;

import com.bjsxt.filter.SecondFilter;

import com.bjsxt.listener.SecondListener;

import com.bjsxt.servlet.SecondServlet;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.web.servlet.FilterRegistrationBean;

import org.springframework.boot.web.servlet.ServletComponentScan;

import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;

import org.springframework.boot.web.servlet.ServletRegistrationBean;

import org.springframework.context.annotation.Bean;

/**

 * Created by Administrator on 2019/2/4.

 */

@SpringBootApplication

public class App2 {

    public static void main(String[] args){

        SpringApplication.run(App2.class,args);

    }

    /**

     * 注册Servlet

     * @return

     */

    @Bean

    public ServletRegistrationBean getServletRegistrationBean(){

        ServletRegistrationBean bean = new ServletRegistrationBean(new SecondServlet());

        bean.addUrlMappings("/second");

        return bean;

    }

    /**

     * 注册Filter

     * @return

     */

    @Bean

    public FilterRegistrationBean getFilterRegistrationBean(){

        FilterRegistrationBean bean = new FilterRegistrationBean(new SecondFilter());

        bean.addUrlPatterns(new String[]{"/second"});

        return bean;

    }

    /**

     * 注册Listener

     * @return

     */

    @Bean

    public ServletListenerRegistrationBean<SecondListener> getServletListenerRegistrationBean(){

        ServletListenerRegistrationBean<SecondListener> bean = new ServletListenerRegistrationBean<SecondListener>(new SecondListener());

        return bean;

    }

}