private String FTP_response(String data)
	{
		Pattern p1  = Pattern.compile("USER");
		Matcher m1  = p1.matcher(data);
		Pattern p2  = Pattern.compile("PUT");
		Matcher m2  = p2.matcher(data);
		
		if (data == null)
			return "500 Unknown command\r\n";
		else if (m1.find())
			return "220 Welcome.\r\n";
		else if (m2.find())
			return "226 OK\r\n";
		else
			return "200 OK\r\n";
	}