jsp Request 请求转发，共享数据

jsp Request 请求转发，共享数据

<%--
  Created by IntelliJ IDEA.
  User: 13634
  Date: 2022/1/122
  Time: 21:52
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>

  
    
  
  
  $END$
  

    

    


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package request;

import javax.servlet.RequestDispatcher;
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;

@WebServlet("/RequestDemo8")
public class RequestDemo8 extends HttpServlet   {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//        String username = req.getParameter("username");
//        System.out.println("get"+username);

        this.doPost(req,resp);
    }

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

        System.out.println("demo8....");
//        RequestDispatcher requestDispatcher = req.getRequestDispatcher("/RequestDemo88");
//        requestDispatcher.forward(req,resp);


        //存储数据到request域中
        req.setAttribute("msg","hello");

        req.getRequestDispatcher("/RequestDemo88").forward(req,resp);
    }
}

package request;

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;

@WebServlet("/RequestDemo88")
public class RequestDemo88 extends HttpServlet   {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//        String username = req.getParameter("username");
//        System.out.println("get"+username);

        this.doPost(req,resp);
    }

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

        //获取数据
        Object msg = req.getAttribute("msg");
    System.out.println(msg);
        System.out.println("demo88.....");
    }
}

结果：

刷新一下：