response重定向

package cn.edu.Response;import java.io.IOException;
import java.io.PrintWriter;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;//实现请求重定向
/*重定向的特点：1.浏览器会向服务器发送两次请求，意味着就有两个request和response2.用重定向技术，浏览器地址栏会发生变化用户登录和显示购物车时，通常会用到重定向技术*/
public class ResponseDemo7 extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.sendRedirect("/day06/index.jsp");}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request,response);}}

request实现转发

package cn.edu.Request;import java.io.IOException;
import java.io.PrintWriter;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
//请求转发，以及使用request域对象把数据带给转发资源
//请求转发的特点：
//1.客户端只发出一次请求，服务器端有多个资源调用
//2.浏览器地址栏没有变化
public class RequestDemo5 extends HttpServlet {//MVC(model   javabean   V   View(jsp)   C   Controller(servlet))public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String data="aaaaa";request.setAttribute("data",data);//request实现转发request.getRequestDispatcher("/message.jsp").forward(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request,response);}}

转发和重定向的区别用两句大白话来解释吧~
转发：你找我借钱，我没有，我帮你找他
重定向：你找我借钱，我没有，我让你自己去找他