java - RedirectView 后的 Spring Handle FlashAttributes

Question

我有一个页面 check，我在其中添加了一个 flashAttribute("error","Test message"); 并将一个 RedirectView 返回到页面登录。

@RequestMapping(value = "/login")
public ModelAndView mainPage(Model model){

    System.out.println(" - " + model.asMap().get("error") + " - "); //-> - null -

    return new ModelAndView("/login");

}

@RequestMapping(value = "/check")
public View checkLogin(RedirectAttributes redirectAttributes,
                       @RequestHeader(value = "username", required = false)String username,
                       @RequestHeader(value = "password", required = false)String password){

    redirectAttributes.addFlashAttribute("error", "Test message");
    return new RedirectView("/login");

}

此行:model.asMap().get("error") 返回 null。我如何处理 RedirectAttributes？

Answer 1

我猜 this可能对你有帮助。

@RequestMapping(value = "/login")
public ModelAndView mainPage(RedirectAttributes redirectAttrs){
    Map<String> attributesMap = redirectAttrs.getFlashAttributes();

    return new ModelAndView("/login");

}

@RequestMapping(value = "/check")
public View checkLogin(RedirectAttributes redirectAttributes,
                       @RequestHeader(value = "username", required = false)String username,
                       @RequestHeader(value = "password", required = false)String password){

    redirectAttributes.addFlashAttribute("error", "Test message");
    return new RedirectView("/login");

}

希望对你有帮助