Question

我正在使用spring mvc。在我登录时设置会话属性。用户登录时，我有一个搜索页面他可以获得有关用户的更多详细信息。没有登录意味着他只能为我设置的目的获得有限的细节 @SessionAttributes中的会话对象在登录表单和用户搜索表单创建中我检查了session属性是否有值如果不是表示设置默认值。但是当我提交表单时，它会显示错误的HTTP状态

500 - Expected session attribute



 @RequestMapping(value = "/user-search", method = RequestMethod.GET)
    public String initUserSearchForm(Model model) {
        User user = new User();
        model.addAttribute("User", user);
        if(!model.containsAttribute("userObject"))
           model.addAttribute(createDefaultUserCredntials());
        return "user";
    }

@RequestMapping(value = "/user-byName", method = RequestMethod.GET)
    public
    @ResponseBody
    String getUserByName(HttpServletRequest request,@ModelAttribute("userObject")User user) {
       .... 
    ....
    }

错误是

   org.springframework.web.HttpSessionRequiredException: Expected session attribute 'userObject'
        org.springframework.web.method.annotation.ModelFactory.initModel(ModelFactory.java:103)
        org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:723)
        org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:687)
        org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
        org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
        org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
        org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:915)
        org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:811)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
        org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:796)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

Answer 1

因为您已声明为sessionattribute，所以在调用控制器时，您应该在会话中提供userObject属性。将它作为ModelAttribbute返回，它将正常工作。将以下代码添加到控制器

@ModelAttribute("userObject")
    public UserObject getUserObject() {
        return new UserObject();

    }

Answer 2

您在哪里设置代码中的'userObject'。我没有在你的代码中看到。根据你的报价你在表单初始化

中设置

 @RequestMapping(value = "/user-search", method = RequestMethod.GET)
    public String initUserSearchForm(Model model) {
        User user = new User();
        model.addAttribute("User", user);
        if(!model.containsAttribute("userObject"))
           model.addAttribute('userObject',createDefaultUserCredntials());
        return "user";
    }

你必须使用这样model.addAttribute('userObject',createDefaultUserCredntials());，否则它只在模型中设置而不在会话中

HTTP状态500 - 预期的会话属性＆＃39; userObject＆＃39;

2 个答案: