docs: public T execute(Connection conn) {
          // 封装socket交易 send
          try {
              send(conn.getOutputStream(), conn.getCharset());
          } catch (IOException e) {
              LOGGER.error("send conent error", e);
              throw new FdfsIOException("socket io exception occured while sending cmd", e);
          }
  
          try {
              return receive(conn.getInputStream(), conn.getCharset());
          } catch (IOException e) {
              LOGGER.error("receive conent error", e);
              throw new FdfsIOException("socket io exception occured while receive content", e);
          }
  
      }