SpringBoot---注册Servlet,Filter,Listener

1、概述

　　　　1.1、当使用  内嵌的Servlet容器（Tomcat、Jetty等）时，将Servlet,Filter,Listener  注册到Servlet容器的方法：

　　　　　　　　1.1.1、直接注册Bean　　　　　　　　　　　　

　　　　　　　　1.1.2、注册ServletRegistrationBean、FilterRegistrationBean、ServletListenerRegistrationBean　的Bean　

　　　　　　　　　　eg：

package com.an;

import com.an.servletfilterlistener.MyFilter;
import com.an.servletfilterlistener.MyListener;
import com.an.servletfilterlistener.MyServlet;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;

/**
 * @description:
 * @author: anpeiyong
 * @date: Created in 2019/11/14 19:56
 * @since:
 */
@SpringBootApplication
public class MyDemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(MyDemoApplication.class, args);
    }

    /**
     * 内嵌Servlet容器中注册Servlet、Filter、Listener---第一种方式：直接注册Bean
     */
    @Bean
    public MyServlet getMyServlet(){
        return new MyServlet();
    }

    @Bean
    public MyFilter getMyFilter(){
        return new MyFilter();
    }

    @Bean
    public MyListener getMyListener(){
        return new MyListener();
    }

    /**
     * 内嵌Servlet容器中注册Servlet、Filter、Listener---第二种方式：注册ServletRegistrationBean、FilterRegistrationBean、ServletListenerRegistrationBean　的Bean
     */
    public ServletRegistrationBean getServletRegistrationBean(){
        return new ServletRegistrationBean(new MyServlet(),"/**");
    }

    public FilterRegistrationBean getFilterRegistrationBean(){
        FilterRegistrationBean filterRegistrationBean=new FilterRegistrationBean();
        filterRegistrationBean.setFilter(new MyFilter());
        filterRegistrationBean.setOrder(2);
        return filterRegistrationBean;
    }

    public ServletListenerRegistrationBean getServletListenerRegistrationBean(){
        return new ServletListenerRegistrationBean(new MyListener());
    }

}