private static PrintStream createClientSender(Socket clientSocket) {
		PrintStream commandSender = null;
		try {
			commandSender = new PrintStream(clientSocket.getOutputStream());
			log.info("Create PrintStream from socket OutputStream");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			log.info("Create PrintStream from socket OutputStream: fail IOException");
		}
		return commandSender;
	}