今天遇到了一個很離奇的場景，使用ajax請求後臺結果 後臺處理成功了頁面還報了404錯誤。

程式設計師不說話，默默上程式碼：

JS：

var save = function(){
    $.ajax({
              url: urlMap.saveOrUpdateGroupInfo,
              type: 'post',
              async: false,
              dataType: 'json',
              data: $("#groupInfo").serialize()
        }).done(function(res) {
         console.log(res);
          if(res.success) {
              
            }else{
              bootbox.alert(res.msg);
              
            }
        });
}
 

  @RequestMapping(value = "/saveOrUpdate", method = RequestMethod.POST)
    public ResponseVo saveOrUpdate(String id, String name, String parentId, String parentName, String operate){
        ResponseVo result = new ResponseVo();
        GroupInfo info = new GroupInfo();
        Date now =new Date();
        info.setUpdateTime(now);
            try{
                if(operate.equals("add")){
                    info.setParentId(Integer.parseInt(parentId));
                    info.setName(name);
                    info.setCreateTime(now);
                    groupInfoService.addGroup(info);
                }else if (operate.equals("edit")) {
                    info.setId(Integer.parseInt(id));
                    info.setName(name);
                    info.setParentId(Integer.parseInt(parentId));
                    groupInfoService.updateGroup(info);
                }else if (operate.equals("delete")) {
                    groupInfoService.deleteGroup(Integer.parseInt(id));
                }
                result.setSuccess(true);
            }catch (Exception e){
                log.error("operate group error."+ JsonUtil.toString(info), e);
                result.setSuccess(false);
                result.setMsg(e.getMessage());
            }
        return result;
    }
}
 

經分析是請求沒有返回狀態碼，這是因為我用的是SpringMVC框架，前後端使用JSON傳遞資料，因為返回的是物件，而忘記了新增

@ResponseBody

正常後臺程式碼：

@RequestMapping(value = "/saveOrUpdate", method = RequestMethod.POST)
    @ResponseBody
    public ResponseVo saveOrUpdate(String id, String name, String parentId, String parentName, String operate){
        ResponseVo result = new ResponseVo();
        GroupInfo info = new GroupInfo();
        Date now =new Date();
        info.setUpdateTime(now);
            try{
                if(operate.equals("add")){
                    info.setParentId(Integer.parseInt(parentId));
                    info.setName(name);
                    info.setCreateTime(now);
                    groupInfoService.addGroup(info);
                }else if (operate.equals("edit")) {
                    info.setId(Integer.parseInt(id));
                    info.setName(name);
                    info.setParentId(Integer.parseInt(parentId));
                    groupInfoService.updateGroup(info);
                }else if (operate.equals("delete")) {
                    groupInfoService.deleteGroup(Integer.parseInt(id));
                }
                result.setSuccess(true);
            }catch (Exception e){
                log.error("operate group error."+ JsonUtil.toString(info), e);
                result.setSuccess(false);
                result.setMsg(e.getMessage());
            }
        return result;
    }