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response 2.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);	}}

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);	}}