NetworkInterfaceを使いMACアドレスを取得する(要JDK1.6以上)

SampleGetMacAddress.java

import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

public class SampleGetMacAddress {
	public static void main(String args[]) {
		try {
			Map<String, String> macAdd = getMacAddress();

			for(String key : macAdd.keySet()) {
				System.out.println(key + " : " + macAdd.get(key));
			}
		} catch (SocketException e) {
			e.printStackTrace();
		}
	}

	public static Map<String,String> getMacAddress() throws SocketException {
		String nicaddr = "";
		Map map = new HashMap();
		
		Enumeration<NetworkInterface> nic = NetworkInterface.getNetworkInterfaces();

		while (nic.hasMoreElements()) {
			NetworkInterface n = nic.nextElement();

			// MACアドレスをbyte[]で取得
			byte[] addressByte = n.getHardwareAddress();
			// 取得したMACアドレスをStringへ変換
			nicaddr = "";
			if (addressByte != null) {
				for (byte b : addressByte) {
					nicaddr = nicaddr + String.format("%02X", b);
				}
			}
			
			map.put(n.getName(),nicaddr);
		}
		return map;
	}
}

【実行結果サンプル】
lo :
tun2 : 2B0BA18C
eth1 : 0024A57F3F27
tun1 :
tun0 : FFFFFFFFFFFFFFFF
eth0 : 002318B2E545