Spring MVC的重定向失敗

Question

我想做的事與Spring MVC + MyBatis的登錄頁面，則控制器如下：

@Controller 
public class LoginController { 
private final UserService userService; 

@Autowired 
public LoginController(@Qualifier("userService") UserService userService) { 
    this.userService = userService; 
} 

@RequestMapping(value = "/login") 
public ModelAndView Login(String username, String password, 
          ModelAndView mv, HttpSession session) { 
    User user = userService.login(username, password); 

    // **This is where problems occured** 
    if (user != null) { 
     session.setAttribute("user", user); 
     mv.setView(new RedirectView("/main")); 
    } else { 
     mv.addObject("message","Login failed."); 
     mv.setViewName("loginForm"); 
    } 
    return mv; // with correct value, but responses 404 error 
} 

@RequestMapping(value = "/loginForm") 
public String LoginForm() { 
    return "loginForm"; 
} 

@RequestMapping(value = "/main") 
public String Main(Model model) { 
    return "main"; 
} 
} 

我有兩個JSP文件：

/WEB-INF/jsp/loginForm.jsp 
/WEB-INF/jsp/main.jsp 

我是否提交正確或不登錄形式，有一個404錯誤：

HTTP Status 404 - /WEB-INF/jsp/login.jsp 

在調試模式下運行時，MV與「/ main」正確返回，所以令我困惑。

下面的代碼工作，但我不能添加錯誤消息來查看了。

@RequestMapping(value = "/login") 
public String Login(String username, String password, HttpSession session) { 
    User user = userService.login(username, password); 
    if (user != null) { 
     session.setAttribute("user", user); 
     return "redirect:/main"; 
    } else { 
     session.setAttribute("message","Login failed"); 
     return "redirect:/loginForm"; 
    } 
} 

Answer 1

我有面子同樣的問題，但它

ModelAndView model = new ModelAndView(); 
if (user != null) { 
     session.setAttribute("user", user); 
     model = new ModelAndView("/main"); 
    } else { 
     mv.addObject("message","Login failed."); 
     model = new ModelAndView("/loginForm"); 
    } 
return model;