ssh后台返回值问题

子规入梧桐 2018-08-28 03:06:15

问题描述：做登陆页面的时候，用到form表单提交，在后台进行处理，如果登陆成功就跳转到主页，登陆不成功就重定向到登陆页，显示登陆不成功信息。我在后台写了个message 储存登录失败信息，在前端判断message是否为空，为空就不显示，不为空就显示message信息。现在出现的问题是，直接访问登陆页面就出现了message（message是否为空判断都没有执行），且message显示如下：

后台相关代码：

 @RequestMapping(value = "/loginAction",method = RequestMethod.POST)

        public String loginAction(@RequestParam("nickname")String nickName,@RequestParam("password")String password,ModelMap modelMap,HttpServletRequest request) {

        List<UserEntity> userEntityList = userRepository.findByNickname(nickName);

        HttpSession session = request.getSession();

        session.setMaxInactiveInterval(1000 * 60 * 60);

//        System.out.println("session.getAttribute:"+session.getAttribute("user"));

        if (session.getAttribute("user") == null||session.getAttribute("user").equals("")) {

            session.setAttribute("user", userEntityList.get(0));



//            logger.error("Nickname:"+nickName);

//            logger.error("Password:"+password);

            logger.error("userEntityList.size():" + userEntityList.size());

            logger.error("userEntityList:" + userEntityList);

//            logger.error("password:"+userEntityList.get(0).getPassword());



            if (userEntityList.size() != 0) {

                if (userEntityList.get(0).getPassword().equals(password)) {

                    modelMap.addAttribute("user", userEntityList.get(0));

                    List<BlogEntity> blogEntityList = blogRepository.findAll();

                    Map<Integer, String> desc = new HashMap<Integer, String>(); //200字描述



                    logger.error("blogEntityList.size:" + blogEntityList.size());

                    if (blogEntityList.size() > 0) {

                        for (BlogEntity blog : blogEntityList) {

                            if (blog.getContent().length() > 200) {

                                desc.put(blog.getId(), blog.getContent().substring(0, 203) + "...");

                            } else {

                                desc.put(blog.getId(), blog.getContent());

                            }

                        }



                        Map<String, List<BlogEntity>> map = toThree(blogEntityList);

                        modelMap.addAttribute("blogs1", map.get("blogs1"));

                        modelMap.addAttribute("blogs2", map.get("blogs2"));

                        modelMap.addAttribute("blogs3", map.get("blogs3"));

                        modelMap.addAttribute("desc", desc);

                    }

                    return "index2";

                }

               String message = "密码错误，请重新输入！";

                modelMap.addAttribute("message", message);

                return "redirect:/login";

            } else {

                String message = "未找到用户，请检查昵称和密码！";

                modelMap.addAttribute("message",message);

                return "redirect:/login";

            }





        }else{

            String message = "已经有用户登陆，请先登出用户之后再登陆！";

            modelMap.addAttribute("message",message);

            return "redirect:/login";

        }



    }

前端相关代码：

<c:if test="${!empty message}">

<div class="alert alert-warning" role="alert">

    <span class="glyphicon glyphicon-info-sign" aria-hidden="true" >${message}</span></a>

</div>

</c:if>

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