springboot中使用servlet通过配置类

package com.bjpowernode.springboot.servlet;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class HeServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
       resp.getWriter().write("he springboot servlet");
       resp.getWriter().flush();
       resp.getWriter().close();

    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
       doGet(req,resp);
    }
}

package com.bjpowernode.springboot.config;

import com.bjpowernode.springboot.servlet.HeServlet;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.servlet.ServletRegistration;

@Configuration
public class ServletConfig {

    @Bean
    public ServletRegistrationBean heServletRegisterBen() {
        ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(
                new HeServlet(), "/servlet/heservlet"
        );
        return servletRegistrationBean;
    }
}