SPRING MVC：在一个方法中定义的HttpSession对另一种方法不可用

Question

我在Spring MVC项目中实现了与Httpsession有关的问题。

首先，在用户成功登录后，我将在loginAuthentication控制器中使用Httpsession对象，并使用所需的名称和值设置属性。 （如下图所示。）>

A.java控制器文件，

@RequestMapping(value="login-authentication", method = RequestMethod.POST)
    public String authentication(@Valid @ModelAttribute("systemAccount") SystemAccount systemAccount,
                                 BindingResult bindingResult, Model model, HttpServletRequest request){
        if (bindingResult.hasErrors()) {
            model.addAttribute(GenericConstant.MessageAttributeName.ERROR_MSG_NAME.toValue(), SystemMessage.SystemException.LOGIN_INCORRECT_USERNAME_PASSWORD.toValue());
            model.addAttribute("systemAccount", new SystemAccount());
            return "index";
        }else {
            if (systemAccountService.authenticate(systemAccount.getUsername(), systemAccount.getPassword()) != null &&
                    !"".equals(systemAccountService.authenticate(systemAccount.getUsername(), systemAccount.getPassword()))) {

                SystemAccount dbSystemAccount = systemAccountService.authenticate(systemAccount.getUsername(), systemAccount.getPassword());

                request.setAttribute(SessionAttribute.AttributeName.LOGIN_ACC_ID.toValue(),dbSystemAccount.getAccountID());
                //check account role
                if(dbSystemAccount.getCounterStaff()!= null && !"".equals(dbSystemAccount.getCounterStaff())){
                    CounterStaff counterStaff =  dbSystemAccount.getCounterStaff();
                    request.setAttribute(SessionAttribute.AttributeName.LOGIN_ACC_NAME.toValue(), counterStaff.getStaffName());
                    request.setAttribute(SessionAttribute.AttributeName.LOGIN_ACC_ROLE.toValue(), GenericConstant.SystemRole.COUNTER_STAFF.toValue());

                }else if(dbSystemAccount.getCustomer()!= null && !"".equals(dbSystemAccount.getCustomer())){
                    Customer customer = dbSystemAccount.getCustomer();
                    request.setAttribute(SessionAttribute.AttributeName.LOGIN_ACC_NAME.toValue(), customer.getCustomerName());
                    request.setAttribute(SessionAttribute.AttributeName.LOGIN_ACC_ROLE.toValue(), GenericConstant.SystemRole.CUSTOMER.toValue());

                }else if(dbSystemAccount.getManager()!= null && !"".equals(dbSystemAccount.getManager())){
                    Manager manager = dbSystemAccount.getManager();
                    request.setAttribute(SessionAttribute.AttributeName.LOGIN_ACC_NAME.toValue(), manager.getManagerName());
                    request.setAttribute(SessionAttribute.AttributeName.LOGIN_ACC_ROLE.toValue(), GenericConstant.SystemRole.MANAGER.toValue());

                }else if(dbSystemAccount.getDoctor()!= null && !"".equals(dbSystemAccount.getCounterStaff())){
                    Doctor doctor = dbSystemAccount.getDoctor();
                    request.setAttribute(SessionAttribute.AttributeName.LOGIN_ACC_NAME.toValue(), doctor.getDoctorName());
                    request.setAttribute(SessionAttribute.AttributeName.LOGIN_ACC_ROLE.toValue(), GenericConstant.SystemRole.DOCTOR.toValue());
                }

                request.setAttribute(SessionAttribute.AttributeName.LOGIN_DATE.toValue(), DateTimeUtil.getCurrentDate());
                return "mainPage";
            }else {
                model.addAttribute(GenericConstant.MessageAttributeName.ERROR_MSG_NAME.toValue(), SystemMessage.SystemException.LOGIN_INCORRECT_USERNAME_PASSWORD);
                model.addAttribute("systemAccount", new SystemAccount());
                return "index";
            }
        }
    }
一切准备就绪后，控制器会将用户导航到主页，并且主页能够无问题地访问所有定义的变量。 （下图显示了与mainPage映射的控制器）。

A.java控制器文件，

@RequestMapping(value = "/mainPage", method = RequestMethod.GET)
    public String renderMainPageView(Model model, HttpServletRequest request) {
        if(request.getAttribute(SessionAttribute.AttributeName.LOGIN_CHECK.toValue()) != null) {
            model.addAttribute(SessionAttribute.AttributeName.LOGIN_ACC_ID.toValue(),
                    request.getAttribute(SessionAttribute.AttributeName.LOGIN_ACC_ID.toValue()));
            model.addAttribute(SessionAttribute.AttributeName.LOGIN_ACC_NAME.toValue(),
                    request.getAttribute(SessionAttribute.AttributeName.LOGIN_ACC_NAME.toValue()));
            model.addAttribute(SessionAttribute.AttributeName.LOGIN_ACC_ROLE.toValue(),
                    request.getAttribute(SessionAttribute.AttributeName.LOGIN_ACC_ROLE.toValue()));
            model.addAttribute(SessionAttribute.AttributeName.LOGIN_DATE.toValue(),
                    request.getAttribute(SessionAttribute.AttributeName.LOGIN_DATE.toValue()));
            return "mainPage";
        }else {
            model.addAttribute("systemAccount", new SystemAccount());
            return "index";
        }
    }
在主页的导航菜单中，我单击选择以指示我添加经理网页。 （以下显示了链接）。 

<a href="addManager" target="ifrm" >Add New Account</a>
与链接（GET）映射的控制器能够检测到。但是，当我尝试在if条件下使用getAttribute

方法访问时，此控制器（renderAddManagerView）无法识别我先前定义的HTTP会话。它一直显示空值（如下图所示。

B.java控制器文件，

] >>

@RequestMapping(value = "/addManager", method = RequestMethod.GET)
    public String renderAddManagerView(Model model, HttpSession httpSession) {
        if(httpSession.getAttribute(SessionAttribute.AttributeName.LOGIN_CHECK.toValue()) != null) {
            model.addAttribute("manager", new Manager());
            model.addAttribute(FormSelectionValue.FormSelectionAttributeName.COUNTRY_SELECTION.toValue(), FormSelectionValue.COUNTRY_SELECTION_LIST);
            model.addAttribute(FormSelectionValue.FormSelectionAttributeName.GENDER_SELECTION.toValue(), FormSelectionValue.GENDER_SELECTION_LIST);
            return "addManager";
        }else {
            model.addAttribute("systemAccount", new SystemAccount());
            return "index";
        }
    }
所以我不确定我的代码有什么问题，并且不会显示错误消息。 

我在Spring MVC项目中实现了有关Httpsession的问题。首先，在用户成功登录后，我将在...

Answer 1

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