springMVC中的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";
}
}