ajax请求springmvc返回json乱码

 $jq.ajax({
                url: '${/request/@context_path}/hls/hlssignattachmentcontroller'+'?frameworkAgreementId='+frameworkAgreementId+'&userId='+userId,
                method: 'get',
                success: function (args) {
                    Leaf.showMessage('提示', args.message);
                    Leaf.Masker.unmask(Ext.getBody(), '${l:HLS.EXECUTING}');
                    return;
                },

java controller

  @RequestMapping(value = {"/hls/hlssignattachmentcontroller"}, produces = "application/json;charset=UTF-8")//produces不生效
    @ResponseBody
    public ResponseData  sendInfo(HttpServletResponse response, Integer frameworkAgreementId, Integer userId) {
        ResponseData responseData = new ResponseData();
        response.setContentType("text/html;charset=utf-8");//添加后生效
        try {
            iSignAttachmentService.sendInfo(frameworkAgreementId, userId);
            responseData.setSuccess(true);
            responseData.setMessage(HfaConstant.SUCCESS_MSG);
            return responseData;
        } catch (ParamsException e) {
            e.printStackTrace();
            responseData.setSuccess(false);
            responseData.setMessage(e.getMsg());
            return responseData;
        }
        catch (ServiceException e) {
            e.printStackTrace();
            responseData.setSuccess(false);
            responseData.setMessage(e.getMessage());
            return responseData;
        }
        catch (Exception e) {
            e.printStackTrace();
            responseData.setSuccess(false);
            responseData.setMessage(e.getMessage());
            return responseData;
        }
    }

原因：返回对象为json形式
参考https://www.cnblogs.com/roy-blog/p/7048401.html