SpringMvc之回顾Servlet

      junit
      junit
      4.13.2
      test
    

    
      org.springframework
      spring-webmvc
      5.1.9.RELEASE
    

    
      javax.servlet
      servlet-api
      2.5
    

    
      javax.servlet.jsp
      jsp-api
      2.2.1-b03
    

    
      javax.servlet
      jstl
      1.2
    

  

package com.lxy.servlet;

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

public class HellowServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //获取前端数据
        String msg = req.getParameter("message");
        if ("add".equals(msg)){
            req.getSession().setAttribute("msg","执行了add方法");
        }
        if ("delete".equals(msg)){
            req.getSession().setAttribute("msg","执行了delete方法");
        }
        //调用业务层

        //视图转发或重定向
        req.getRequestDispatcher("/WEB-INF/jsp/test.jsp").forward(req,resp);

    }

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

    
        hello
        com.lxy.servlet.HellowServlet
    
    
        hello
        /hello