code: @Override
  	public TransactionId getTransIdFromByte(byte[] transId) {
  		
  		ByteBuffer byteBuffer = ByteBuffer.wrap(transId);
  		int appId = getUnsignedShort(byteBuffer);
  		int busCode = getUnsignedShort(byteBuffer);
  		long trxId = byteBuffer.getLong();
  		
  		return new TransactionId(codecer.findString(APP_ID, appId), codecer.findString(BUSINESS_CODE, busCode), trxId);
  	}
docs: /* (non-Javadoc)
  @see com.yiqiniu.easytrans.util.ByteFormIdCodec#getTransIdFromByte(byte[])