Response案例1_重定向

 import javax.servlet.ServletException;
 import javax.servlet.annotation.WebServlet;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import java.io.IOException;
 
 /**
  * @Author: 艾康
  * @Date: 2019/10/15 23:13
  */
 
 /**
  * 重定向
  */
 @WebServlet("/servlettest1")
 public class ServletTest1 extends HttpServlet {
     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
         //重定向：资源跳转方式
         System.out.println("111111111");
         //1.设置状态码为302
         response.setStatus(302);
         //2.告诉浏览器跳转资源路径，使用响应头localhost：跳转的资源路径 设置响应头
 
         response.setHeader("location","/Case1/servlettest2");
 
     }
 
     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
     this.doPost(request,response);
     }
 }

简化代码：

 import javax.servlet.ServletException;
 import javax.servlet.annotation.WebServlet;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import java.io.IOException;
 
 /**
  * @Author: 艾康
  * @Date: 2019/10/15 23:13
  */
 
 /**
  * 重定向
  */
 @WebServlet("/servlettest1")
 public class ServletTest1 extends HttpServlet {
     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
         //重定向：资源跳转方式
         System.out.println("111111111");
         //1.设置状态码为302
         response.setStatus(302);
         //2.告诉浏览器跳转资源路径，使用响应头localhost：跳转的资源路径 设置响应头
         // response.setHeader("location","/Case1/servlettest2");
         //简化代码
         response.sendRedirect("/Case1/servlettest2");
 
     }
 
     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
     this.doPost(request,response);
     }
 }

重定向特点：

　　1.地址栏发生变化

　　2.重定向可以访问其他站点的资源

　　3.重定向是两次请求