Question

我正在尝试保存一些并在Spring会话中更新我的数据，但它无法正常工作。我用ajax向控制器发送数据，控制器收到数据。我试了几个小时但却无法弄清楚问题。这是我的控制器代码

@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);
    }
}

我也尝试使用ModelMap：

 map.put("qparameters",params);

这也行不通。

编辑：我正在使用Ajax请求：

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

在发送响应之前，我打印的是写入但在jsp中未反映的值。

谢谢！

Answer 1

我认为以下内容无效：request.getParameterValues("params[]")，因为我认为您的页面中没有名为params[]的参数。相反，您可以在方法签名中添加@RequestParam (required = false) String[] params（并为所有参数执行此操作）。

然后，当您声明@SessionAttributes时，将这些属性放入模型中会将它们添加到会话中。但您可能需要使用org.springframework.ui.Model而不是ModelMap，因为后者已被弃用。然后执行model.addAttribute("params", params)。

Answer 2

JavaScript无法访问会话变量。回复所需的更新响应正文

无法更新会话值Spring

2 个答案: