Java Mac Address Get getMacAddr()

Description

Retrive mac address for current machine

License

Open Source License

Declaration

public static String getMacAddr() 

Method Source Code

//package com.java2s;
/**//from  w  w  w.  ja v  a2 s  . co m
 * Project: com.dianping.avatar-core-1.0.0-SNAPSHOT
 * 
 * File Created at 2011-1-9
 * $Id$
 * 
 * Copyright 2010 dianping.com.
 * All rights reserved.
 *
 * This software is the confidential and proprietary information of
 * Dianping Company. ("Confidential Information").  You shall not
 * disclose such Confidential Information and shall use it only in
 * accordance with the terms of the license agreement you entered into
 * with dianping.com.
 */

import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;

import java.util.Enumeration;

public class Main {
    /**
     * Retrive mac address for current machine
     */
    public static String getMacAddr() {
        String macAddr = "";
        String str = "";
        try {
            NetworkInterface nic = NetworkInterface.getByName("eth0");
            if (nic != null) {
                byte[] buf = nic.getHardwareAddress();
                if (buf != null) {
                    for (int i = 0; i < buf.length; i++) {
                        str = str + byteHEX(buf[i]);
                    }
                }
                macAddr = str.toUpperCase();
            } else {
                Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();
                NetworkInterface networkInterface = null;
                while (networkInterfaces.hasMoreElements()) {
                    networkInterface = networkInterfaces.nextElement();
                    Enumeration<InetAddress> inetAddresses = networkInterface.getInetAddresses();
                    while (inetAddresses.hasMoreElements()) {
                        InetAddress inetAddress = inetAddresses.nextElement();
                        if (!inetAddress.isLoopbackAddress() && !Inet6Address.class.isInstance(inetAddress)) {
                            break;
                        }
                    }
                }
                if (networkInterface != null) {
                    byte[] buf = networkInterface.getHardwareAddress();
                    if (buf != null) {
                        for (int i = 0; i < buf.length; i++) {
                            str = str + byteHEX(buf[i]);
                        }
                    }
                }
                macAddr = str.toUpperCase();
            }
        } catch (SocketException e) {
            e.printStackTrace();
            System.exit(-1);
        }
        return macAddr;
    }

    public static String byteHEX(byte ib) {
        char[] Digit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
        char[] ob = new char[2];
        ob[0] = Digit[(ib >>> 4) & 0X0F];
        ob[1] = Digit[ib & 0X0F];
        String s = new String(ob);
        return s;
    }
}

Related

1. getMac()
2. getMacAddress()
3. getMacAddress()
4. getMacAddress()
5. getMacAddress()