Here you can find the source of getMacAddress()
public static String getMacAddress() throws UnknownHostException, SocketException
//package com.java2s; /*//from w w w. j av a 2 s. com * Copyright 2012 GBSYS. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.net.InetAddress; import java.net.NetworkInterface; import java.net.SocketException; import java.net.UnknownHostException; public class Main { public static String getMacAddress() throws UnknownHostException, SocketException { return getMacAddress(InetAddress.getLocalHost()); } public static String getMacAddress(String url) throws UnknownHostException, SocketException { return getMacAddress(InetAddress.getByName(url)); } public static String getMacAddress(InetAddress url) throws UnknownHostException, SocketException { NetworkInterface network = NetworkInterface.getByInetAddress(url); byte[] mac = network.getHardwareAddress(); StringBuilder sb = new StringBuilder(); for (int i = 0; i < mac.length; i++) { sb.append(String.format("%02X%s", mac[i], (i < mac.length - 1) ? "-" : "")); } return sb.toString(); } }