spring boot servlet 注入

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


public class TestServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
  
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println("你的特殊的servlet。。。哦....");
        response.getWriter().append("Served at: ").append(request.getContextPath());
    }


    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

}

    @Bean
    public TestServlet servlet(){
        return new TestServlet();
    }
    
    @Bean
    public ServletRegistrationBean testServlet(TestServlet servlet) {
        ServletRegistrationBean registration = new ServletRegistrationBean(servlet);
        registration.setEnabled(true);
        registration.addUrlMappings("/servlet/test");
        return registration;
    }