import java.net.InetAddress;
import java.io.InputStream;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.text.ParseException;
import java.util.StringTokenizer;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.applet.Applet;

public class appletMac extends Applet {
	public static void main(String args[]) {
		appletMac macAppl = new appletMac();
		macAppl.start();
	}

	public void start() {
		restart();
	}

	public void restart() {
		try {
			System.out.println(getMacAddress());
		} catch (Throwable t) {
			t.printStackTrace();
		}
	}

	public static String getMacAddress() throws IOException {
		String os = System.getProperty("os.name");
		try {
			if (os.startsWith("Windows")) {
				return windowsParseMacAddress(windowsRunIpConfigCommand());
			} else {
				throw new IOException("Système d'exploitation non supporté : "
						+ os);
			}
		} catch (ParseException ex) {
			ex.printStackTrace();
			throw new IOException(ex.getMessage());
		}
	}

	private static String windowsRunIpConfigCommand() throws IOException {
		Process p = Runtime.getRuntime().exec("ipconfig /all");
		InputStream stdoutStream = new BufferedInputStream(p.getInputStream());
		StringBuffer buffer = new StringBuffer();
		for (;;) {
			int c = stdoutStream.read();
			if (c == -1)
				break;
			buffer.append((char) c);
		}
		String outputText = buffer.toString();
		stdoutStream.close();
		return outputText;
	}

	private static String windowsParseMacAddress(String ipConfigResponse)
			throws ParseException

	{

		String localHost = null;

		try

		{

			localHost = InetAddress.getLocalHost().getHostAddress();

		} catch (java.net.UnknownHostException ex) {
			ex.printStackTrace();
			throw new ParseException(ex.getMessage(), 0);
		}
		StringTokenizer tokenizer = new StringTokenizer(ipConfigResponse, "\n");
		String lastMacAddress = null;
		while (tokenizer.hasMoreTokens()) {
			String line = tokenizer.nextToken().trim();

			if (line.endsWith(localHost) && lastMacAddress != null) {
				return lastMacAddress;
			}

			int macAddressPosition = line.indexOf(":");
			if (macAddressPosition <= 0)
				continue;
			String macAddressCandidate = line.substring(macAddressPosition + 1)
					.trim();
			if (windowsIsMacAddress(macAddressCandidate)) {
				lastMacAddress = macAddressCandidate;
				continue;
			}
		}

		ParseException ex = new ParseException("cannot read MAC address from ["
				+ ipConfigResponse + "]", 0);
		ex.printStackTrace();
		throw ex;
	}

	private static boolean windowsIsMacAddress(String macAddressCandidate)

	{

		Pattern macPattern = Pattern

				.compile("[0-9a-fA-F]{2}-[0-9a-fA-F]{2}-[0-9a-fA-F]{2}-[0-9a-fA-F]{2}-[0-9a-fA-F]{2}-[0-9a-fA-F]{2}");

		Matcher m = macPattern.matcher(macAddressCandidate);

		return m.matches();

	}

}