無法更新會話值春天

Question

我試圖保存一些和更新我的數據在春季會議，但它不工作。我用ajax向控制器發送數據，數據由控制器接收。我嘗試了幾個小時，但無法弄清楚問題所在。這裏是我的控制器代碼

@Controller 
@RequestMapping("/pages/CreateQuestion") 
@SessionAttributes({"question", "preview", "qparameters", "qhparameters"}) 
public class CreateQuestionController { 

@RequestMapping(value = "/SaveQuestion/two", method = RequestMethod.POST) 
    public @ResponseBody 
    ResponseObject saveQuestionTwo(HttpServletRequest request, HttpServletResponse res, ModelMap map) { 
     ResponseObject obj = null; 
     try { 

      int auth = UserAuthentication.checkAuthentication(); 
      if (auth > 0) { 
       String question = request.getParameter("question"); 
       String preview = request.getParameter("preview"); 
       String[] params = request.getParameterValues("params[]"); 
       String[] hparams = request.getParameterValues("hparams[]"); 
       if (question != null && question.length() > 5) { 

        QuestionStepOne one = (QuestionStepOne) map.get("one"); 

        if (one.getParamiterised().equals("Yes")) { 
         if (params == null && hparams == null) { 
          obj = new ResponseObject("e", "Please provide data."); 
         } else { 

          if (params != null && hparams != null) { 
           setSessionValue(request, "qparameters", params); 
           setSessionValue(request, "qhparameters", hparams); 
           System.out.println("\n\n\n\n add both"); 
          } else if (params == null && hparams != null) { 
           setSessionValue(request, "qhparameters", hparams); 
           removeSessionValue(request, "qparameters"); 
           System.out.println("\n\n\n\n add Hparam and remove param"); 
          } else if (params != null && hparams == null) { 
           setSessionValue(request, "qparameters", hparams); 
           removeSessionValue(request, "qhparameters"); 
           System.out.println("\n\n\n\n add param and remove hparam"); 
          } 
          setSessionValue(request, "question", question); 
          setSessionValue(request, "preview", preview); 
          List<Object> list = new ArrayList<Object>(); 
          if (params != null && params.length > 0) { 
           list.add(params); 
          } 
          if (hparams != null && hparams.length > 0) { 
           list.add(hparams); 
          } 
          obj = new ResponseObject("s", "Y", list); 
         } 
        } else { 
         setSessionValue(request, "question", question); 
         setSessionValue(request, "preview", preview); 
         removeSessionValue(request,"qparameters"); 
         removeSessionValue(request,"qhparameters"); 
         obj = new ResponseObject("s", "N"); 
        } 

       } else { 
        obj = new ResponseObject("e", "Please enter question to be saved"); 
       } 
      } else { 
       obj = new ResponseObject("e", "You must be logged in"); 
      } 
     } catch (Exception e) { 
     } finally { 
      System.out.println(getSessionValue(request,"question")); 
      System.out.println(getSessionValue(request,"preview")); 
      System.out.println(getSessionValue(request,"qparameters")); 
      System.out.println(getSessionValue(request,"qhparameters")); 
      return obj; 
     } 
    } 

    private static Object getSessionValue(HttpServletRequest request, String key) { 
     return request.getSession().getAttribute(key); 
    } 

    private static void setSessionValue(HttpServletRequest request, String key, Object obj) { 
     request.getSession().setAttribute(key, obj); 
    } 

    private static void removeSessionValue(HttpServletRequest request, String key) { 
     request.getSession().removeAttribute(key); 
    } 
} 

我試着用ModelMap也：

map.put("qparameters",params); 

這也不能正常工作。

編輯：我使用Ajax的請求：

$.ajax({ 
      url: 'SaveQuestion/two', 
      type: "POST", 
      data: { 
       question: contentForTest, 
       preview: content, 
       params: params, 
       hparams: hparams 
      }, 
      success: function(data) { 
       console.log(data); 
      } 
     }); 

之前發送響應我正在印刷這是寫，但JSP其沒有反映的值。

謝謝！

Answer 1

JavaScript無法訪問會話變量。迴應所需的更新迴應的主體

Answer 2

我不認爲以下將起作用：request.getParameterValues("params[]")，因爲我不認爲你有一個參數在你的網頁名爲params[]。相反，您可以在方法簽名中添加@RequestParam (required = false) String[] params（併爲所有參數執行此操作）。

然後，如您聲明@SessionAttributes，將這些屬性放入您的模型中將會將它們添加到會話中。但是您可能需要使用org.springframework.ui.Model而不是ModelMap，因爲後者已棄用。然後做一個model.addAttribute("params", params)。