세이자바

package test;

import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;

public class NetworkInterfaceTest {
    public static void main(String[] args) throws SocketException {
        Enumeration<NetworkInterface> nienum = NetworkInterface.getNetworkInterfaces();
        while (nienum.hasMoreElements()) {
            NetworkInterface ni = nienum.nextElement();
            System.out.print(ni.getName());
            System.out.print(" : ");
            byte[] hardwareAddress = ni.getHardwareAddress();
            String div = "";
            if (hardwareAddress != null) {
                for (byte b : hardwareAddress) {
                    System.out.print(div);
                    System.out.format("%02X", b);
                    div = "-";
                }
            }
            System.out.println();
        }
    }
}

위와 같이 가져올 수 있다.
Java SE 6.0 부터 제공하는 getHardwareAddress() 를 사용하면 되며, 내부적으로는 JNI 로 구현되어있다.