code: public GetUserInfoListResponse getUserInfoList(List<UserInfo> userInfoList){
          String url = BASE_API_URL + "cgi-bin/user/info/batchget?access_token=#";
          Map<String, List<UserInfo>> param = new HashMap<String, List<UserInfo>>();
          param.put("user_list", userInfoList);
          BaseResponse r=executePost(url, JSONUtil.toJson(param));
          String resultJson = isSuccess(r.getErrcode()) ? r.getErrmsg() : r.toJsonString();
          GetUserInfoListResponse getUserInfoListResponse=JSONUtil.toBean(resultJson,GetUserInfoListResponse.class);
          return getUserInfoListResponse;
      }
docs: 批量获取关注者信息
  
  @param userInfoList 关注者ID列表
  @return 关注者信息对象列表