form表单数据封装成json格式并提交给服务器的实现方法

<form action="#" id="costForm">
<input type="hidden" id="userId" name="userId"/>
<div id="COST">
 <img src='<%=path %>/cvc/center/images/close.png' class="close" style="width:34px;position:absolute;right:0px;top:0px;"></img>
 <h2 style="font-weight: bolder;font-size: 14px;">更改该注册订单的收费状态</h2>
 <ul>
 <li>
 <label for="report">
 　是否已报到：
 </label>
 <input type="radio" id="baodao1" name="baodao" value="1"/>是
 <input type="radio" id="baodao0" name="baodao" value="0"/>否
 </li>
 <li>
 <label for="name">
 　　姓　　名：
 </label>
 <span id="costName"></span>
 </li>
 <li>
 <label for="type">
 　　注册类型：
 </label>
 <span id="costType"></span>
 </li>
 <li>
 <label for="sure_fee">
 　在线支付手续费：
 </label>
 <span id="costType">0</span>
 </li>
 <li>
 <label for="sure_fee">
 　 应收费金额：
 </label>
 <span id="price"></span>
 </li>
 <li>
 <label for="already_fee">
 　 已收费金额：
 </label>
 <input type="text" id="pay_" name="pay"/>
 </li>
 <li>
 <label for="owe">
 　　欠　　款：
 </label>
 <span id="qianPay"></span>
 </li>
 <li>
 <label for="fee_type">
 　　付款方式：
 </label>
 <input type="radio" id="payType1" name="payType" value="3"/>银行
 <input type="radio" id="payType2" name="payType" value="4"/>邮局
 <input type="radio" id="payType3" name="payType" value="5"/>现金
 <input type="radio" id="payType4" name="payType" value="2"/>在线支付
 </li>
 <li>
 <label for="fee_evidence">
 是否收到汇款凭证：
 </label>
 <input type="radio" id="isReceiveProof1" name="isReceiveProof" value="1"/>是
 <input type="radio" id="isReceiveProof0" name="isReceiveProof" value="0"/>否
 </li>
 <li>
 <label for="fa_piao">
 　　发票抬头：
 </label>
 <span id="billTitle"></span>
 </li>
 
 <li>
 <label for="fa_piao">
 　　发票编号：
 </label>
 <input type="text" id="billCode" name="billCode"/>
 </li>
 <li>
 <label for="check_evidence">
 是否已开发票：
 </label>
 <input type="radio" id="isBill1" name="isBill" value="1"/>是
 <input type="radio" id="isBill0" name="isBill" value="0"/>否
 </li>
 <li>
 <label for="get_evidence">
 是否已领发票：
 </label>
 <input type="radio" id="isDrawBill1" name="isDrawBill" value="1"/>是
 <input type="radio" id="isDrawBill0" name="isDrawBill" value="0"/>否
 </li>
 <li>
 
 <label for="date">
 已发确认日期：
 </label>
 <span id="confirmDate"></span>
 <!-- <input type="text" id="confirmDate" name="confirmDate"/> --> 
 <!-- <input id="confirmDate" name="confirmDate" class="text" type="text" onClick="WdatePicker()"/> -->
 </li>
 <li>
 <label for="check_letter">是否已发确认函：</label>
 <span id="isConfirmInvitation"></span>
 </li>
 <li>
 <label for="fa_piao">在线支付状态：</label>
 <span id="payString"></span>
 </li>
 </ul>
 <div class="fee_opr">
 <button type="button" class="fee_sure" style="border: none;background: #003260;color: #ffffff;padding: 3px 30px;margin-left: 10px;border-radius: 0px;">确定</button>
 <button type="button" class="fee_cancel" style="border: none;background: #003260;color: #ffffff;padding: 3px 30px;margin-left: 10px;border-radius: 0px;">关闭</button>
 </div>
</div>
</form>

$(".fee_sure").click(function () {
 var dataObj = $("#costForm").serialize();
 var payType = $('input[name="payType"]:checked').val();
 if(payType == undefined){
 alert("请选择付款类型");
 return ;
 }else{
 $.ajax({
 url:"/webCenter.do?method=saveUserMessage",
 type: "post", 
 dataType:"json",
 data:dataObj,
 cache:false,
 ifModified:true,
 success:function(json){
 if(json.flag == 1){
 alert("1234");
 }
 }
 })
 }
 })

@RequestMapping(params ="method=saveUserMessage",method=RequestMethod.POST) //导入发言
 public void saveUserMessage(int userId,HttpServletRequest request,HttpServletResponse response){
 try {
 HttpSession session = this.getSession(request);
 Adminuser adminUser = session.getAttribute("centerAdminUser") == null?null:(Adminuser) session.getAttribute("centerAdminUser");
 if(adminUser == null){
 try {
 response.sendRedirect(request.getContextPath()+"/center/index.jsp");
 } catch (Exception e) {
 e.printStackTrace();
 }
 }else{
 String billNumber = request.getParameter("billCode")==null?"":request.getParameter("billCode");
 String isBaodao = request.getParameter("baodao")==null?"0":request.getParameter("baodao");
 String haspay = request.getParameter("pay")==null?"0":request.getParameter("pay");
 String payType = request.getParameter("payType")==null?"0":request.getParameter("payType");
 String isFkpz = request.getParameter("isReceiveProof")==null?"0":request.getParameter("isReceiveProof");
 String isYkfp = request.getParameter("isBill")==null?"0":request.getParameter("isBill");
 String isYlfp = request.getParameter("isDrawBill")==null?"0":request.getParameter("isDrawBill");
 JSONObject jsonObject = new JSONObject();
 //AdminuserConferences adminuserConferences = webService.getAdminuserConferences(adminUser.getAdminuserId());
 UserInfo userInfo = webService.getUserInfoById(userId);
 if(userInfo!=null)
 {
 jsonObject.accumulate("flag",1);
 ChcRegUser chcRegUser = webService.getChcRegUser(userId);
 if(chcRegUser!=null)
 {
 chcRegUser.setHasPay(Integer.parseInt(haspay));
 chcRegUser.setPayType(Integer.parseInt(payType));
 if(chcRegUser.getHasPay()-chcRegUser.getPay()==0)
 {
 chcRegUser.setStateType(1);
 }
 webService.saveObject(chcRegUser);
 userInfo.setIsBaodao(Integer.parseInt(isBaodao));
 userInfo.setIsFkpz(Integer.parseInt(isFkpz));
 userInfo.setBillNumber(billNumber);
 userInfo.setIsYlfp(Integer.parseInt(isYlfp));
 userInfo.setIsYkfp(Integer.parseInt(isYkfp));
 webService.saveObject(userInfo);
 jsonObject.accumulate("pay", chcRegUser.getPay());
 jsonObject.accumulate("haspay", chcRegUser.getHasPay());
 }
 }else {
 jsonObject.accumulate("flag",0);
 }
 writeJson(response, jsonObject.toString());
 }
 } catch (Exception e) {
 e.printStackTrace();
 }
 }