fix:go emoji to java emoji（a character takes up 3-4 bytes of special symbols） about dubbo-go-hessian2 HOT 8 CLOSED

  /**
   * Prints a string to the stream, encoded as UTF-8
   *
   * @param v the string to print.
   */
  public void printString(char []v, int strOffset, int length)
    throws IOException
  {
    int offset = _offset;
    byte []buffer = _buffer;

    for (int i = 0; i < length; i++) {
      if (SIZE <= offset + 16) {
        _offset = offset;
        flushBuffer();
        offset = _offset;
      }

      char ch = v[i + strOffset];

      if (ch < 0x80)
        buffer[offset++] = (byte) (ch);
      else if (ch < 0x800) {
        buffer[offset++] = (byte) (0xc0 + ((ch >> 6) & 0x1f));
        buffer[offset++] = (byte) (0x80 + (ch & 0x3f));
      }
      else {
        buffer[offset++] = (byte) (0xe0 + ((ch >> 12) & 0xf));
        buffer[offset++] = (byte) (0x80 + ((ch >> 6) & 0x3f));
        buffer[offset++] = (byte) (0x80 + (ch & 0x3f));
      }
    }

    _offset = offset;
  }

  private int parseUTF8Char()
    throws IOException
  {
    int ch = _offset < _length ? (_buffer[_offset++] & 0xff) : read();

    if (ch < 0x80)
      return ch;
    else if ((ch & 0xe0) == 0xc0) {
      int ch1 = read();
      int v = ((ch & 0x1f) << 6) + (ch1 & 0x3f);

      return v;
    }
    else if ((ch & 0xf0) == 0xe0) {
      int ch1 = read();
      int ch2 = read();
      int v = ((ch & 0x0f) << 12) + ((ch1 & 0x3f) << 6) + (ch2 & 0x3f);

      return v;
    }
    else
      throw error("bad utf-8 encoding at " + codeName(ch));
  }