code: public CreateTagResponse create(QYTag tag){
          CreateTagResponse response;
          String url = BASE_API_URL + "cgi-bin/tag/create?access_token=#";
          if(StrUtil.isBlank(tag.getTagname())){
              throw new WeixinException("标签名称必须填写!");
          }
          if(LOG.isDebugEnabled()){
              LOG.debug("Tag content: {}", tag.toJsonString());
          }
          final Map<String, Object> params = new HashMap<String, Object>();
          params.put("tagname", tag.getTagname());
          if(tag.getTagid() != null){
              params.put("tagid", tag.getTagid());
          }
          BaseResponse r = executePost(url, JSONUtil.toJson(params));
          String jsonResult = isSuccess(r.getErrcode()) ? r.getErrmsg() : r.toJsonString();
          response = JSONUtil.toBean(jsonResult, CreateTagResponse.class);
          return response;
      }
docs: 创建新标签
  @param tag 新标签信息。tagname必须，tagid不填则默认递增
  @return 新的Tag信息