实现请求重定向

package response;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ResponseDemo7 extends HttpServlet {
//实现请求重定向
    /*
     *重定向特点：
     *1.浏览器会想服务器发送两次请求，意味着就有两个request/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 void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        //请求重定向
        //response.setStatus(302);  //设置状态码
        //response.setHeader("location","/Servlet/servlet/ResponseDemo4");

        //请求重定向(相当于上面两句)尽量不要使用请求重定向，要用重定向的：特定场景：登陆成功，网上购物。
        response.sendRedirect("/Servlet/servlet/ResponseDemo4");

    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doGet(request, response);
    }

}