code: public AbstractExcelWriter<T> write(T data) throws WriteExcelException {
          List<T> list = new ArrayList<>(1);
          if (null != data) {
              list.add(data);
          }
          return this.write(list);
      }
docs: 写单个数据
  
  @param data 被写入的数据
  @return this
  @throws WriteExcelException 校验异常
  @see #write(List)