Here you can find the source of getMacAddress()
public static String getMacAddress()
//package com.java2s; /*//from w ww.j a v a2s .co m * #%L * Vaadin Web Application * $Id:$ * $HeadURL:$ * %% * Copyright (C) 2013 Thingtrack S.L. * %% * 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. * #L% */ import java.net.NetworkInterface; import java.net.SocketException; import java.util.Collections; public class Main { public static String getMacAddress() { String result = ""; try { for (NetworkInterface ni : Collections.list(NetworkInterface.getNetworkInterfaces())) { byte[] hardwareAddress = ni.getHardwareAddress(); if (hardwareAddress != null) { for (int i = 0; i < hardwareAddress.length; i++) result += String.format((i == 0 ? "" : "-") + "%02X", hardwareAddress[i]); return result; } } } catch (SocketException e) { System.out.println("Could not find out MAC Adress. Exiting Application "); System.exit(1); } return result; } }