Question

我有一个页面check，在其中添加一个flashAttribute("error","Test message");，并向页面RedirectView返回一个login。

@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。我该如何处理RedirectAttributes？

Answer 1

我想this可能会帮助您。

@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");

}

希望这会有所帮助

RedirectView之后的Spring处理FlashAttributes

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