request重定向_重定向和转发的特点

package cn.itcast.servlet.web;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;/** * 重定向 * Servlet implementation class ResponseDemo1 */@WebServlet("/ResponseDemo1")public class ResponseDemo1 extends HttpServlet {private static final long serialVersionUID = 1L;           /**     * @see HttpServlet#HttpServlet()     */    public ResponseDemo1() {        super();        // TODO Auto-generated constructor stub    }/** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {System.out.println("demo1...........");//访问/ResponseDemo1，会自动跳转到/ResponseDemo2资源1.设置状态码为302//response.setStatus(302);2.设置响应头location//response.setHeader("location", "/Project3/ResponseDemo2");//存值request.setAttribute("msg", "response");//简单的重定向方法response.sendRedirect("/Project3/ResponseDemo2");//response.sendRedirect("https://www.baidu.com/baidu?tn=monline_7_dg&ie=utf-8&wd=%E7%99%BE%E5%BA%A6+%E6%9C%80%E4%BD%B3%E5%A5%B3%E5%A9%BF%E5%85%A8%E6%96%87%E5%85%8D%E8%B4%B9+%E9%98%85%E8%AF%BB%E5%B0%8F%E8%AF%B4%E6%9C%80%E6%96%B0");}/** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubdoGet(request, response);}}

package cn.itcast.servlet.web;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;/** * Servlet implementation class ResponseDemo1 */@WebServlet("/ResponseDemo2")public class ResponseDemo2 extends HttpServlet {private static final long serialVersionUID = 1L;           /**     * @see HttpServlet#HttpServlet()     */    public ResponseDemo2() {        super();        // TODO Auto-generated constructor stub    }/** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {System.out.println("demo2...........");Object msg = request.getAttribute("msg");System.out.println(msg);}/** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubdoGet(request, response);//this.doGet(request, response);}}