重定向的代码

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 stub
        doGet(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 stub
        doGet(request, response);
//        this.doGet(request, response);
    }

}