@ResponseBody
 @RequestMapping("/save")
 public AjaxResult save(ContractPayItem contractPayItem) {
   System.out.println(contractPayItem);
   AjaxResult ar = null;
   if (contractPayItem != null && contractPayItem.getId() != null) {
     service.update(contractPayItem);
     ar = new AjaxResult("合同付款明细更新成功");
   } else {
     service.save(contractPayItem);
     ar = new AjaxResult("合同付款明细保存成功");
   }
   return ar;
 }