springMVC3学习(九)--redirect和forward跳转

 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.RequestMapping;

 @Controller
 public class Login{

         /**转发**/
     @RequestMapping("/login.do")
     public String login(HttpServletRequest request,HttpServletResponse   response){
         request.setAttribute("message", "hello");
         return "forward:/index.do";  //forward在跳转后可以取到message值
     }
     @RequestMapping("/index.do")
     public String index(HttpServletRequest request,HttpServletResponse   response){
         return "welcome";
     }

     /**重定向**/
     @RequestMapping("/logout.do")
     public String logout(HttpServletRequest request,HttpServletResponse   response){
         request.setAttribute("message", "hello");
         return "redirect:/register.do";  //redirect在跳转后无法取到message值
     }
     @RequestMapping("/register.do")
     public String register(HttpServletRequest request,HttpServletResponse   response){
         return "register";
     }
 }

另外forward跳转后地址栏URL不会改变 而redirect会改变