java - 没有参数的Spring MVC重定向

Question

@RequestMapping(value = "/login", method = RequestMethod.POST)
public ModelAndView loginPage(@Valid @ModelAttribute("user")User user, BindingResult result, ModelMap model) {

    if(result.hasErrors()){
        model.addAttribute("failedLogin", "username or password is invalid");
    }

    if(loginService.authenticateUser(user.getUsername(), user.getPassword())){
        model.addAttribute("username", user.getUsername());
        return new ModelAndView("redirect:/welcome");
    }
    else{
        return new ModelAndView("login/login");
    }
}

@RequestMapping(value = "/welcome", method = RequestMethod.GET)
public String welcomePage(@Valid @ModelAttribute("user")User user, BindingResult result, ModelMap model){
    model.addAttribute("username", user.getUsername());
    return "login/welcome";
}

当我登录时，我得到 ' http://localhost:8080/SpringMVC/welcome?username=volkansahin ' 等待 ' http://localhost:8080/SpringMVC/welcome '

我无法清理模型，但我在 JSP 文件中使用了用户名参数。

Answer 1

为了在重定向期间保留您的属性，您必须使用 RedirectAttributes

像这样:

@RequestMapping(value = "/welcome", method = RequestMethod.GET)
public String welcomePage(@Valid @ModelAttribute("user")User user, BindingResult result, ModelMap model, **final RedirectAttributes redirectAttributes**){
    redirectAttributes.addFlashAttribute("username", user.getUsername());
    return "login/welcome";
}

有关重定向属性的更多信息，请参阅此网址: http://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/web/servlet/mvc/support/RedirectAttributes.html

或者按照这个简单的例子:

http://www.logicbig.com/tutorials/spring-framework/spring-web-mvc/redirect-attributes/