code: public GetArticleSummaryResponse getArticleSummary(Date day) {
          BeanUtil.requireNonNull(day, "day is null");
          GetArticleSummaryResponse response = null;
          String url = BASE_API_URL + "datacube/getarticlesummary?access_token=#";
          Map<String, String> param = new HashMap<String, String>();
          param.put("begin_date", DATE_FORMAT.format(day));
          param.put("end_date", DATE_FORMAT.format(day));
          String json = JSONUtil.toJson(param);
          BaseResponse r = executePost(url, json);
          String resultJson = isSuccess(r.getErrcode()) ? r.getErrmsg() : r.toJsonString();
          response = JSONUtil.toBean(resultJson, GetArticleSummaryResponse.class);
          return response;
      }
docs: 获取图文群发每日数据
  
  @param day 查询日期
  @return 图文群发每日数据