Java Mac Address Get getMACAddress(String interfaceName)

Description

Returns MAC address of the given interface name.

License

Apache License

Parameter

Parameter	Description
interfaceName	eth0, wlan0 or NULL=use first interface

Return

mac address or empty string

Declaration

public static String getMACAddress(String interfaceName) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.net.*;
import java.util.*;

public class Main {
    /**//from  w  w  w  .j  a v  a2  s.  co  m
     * Returns MAC address of the given interface name.
     * @param interfaceName eth0, wlan0 or NULL=use first interface 
     * @return  mac address or empty string
     */
    public static String getMACAddress(String interfaceName) {
        try {
            List<NetworkInterface> interfaces = Collections.list(NetworkInterface.getNetworkInterfaces());
            for (NetworkInterface intf : interfaces) {
                if (interfaceName != null) {
                    if (!intf.getName().equalsIgnoreCase(interfaceName))
                        continue;
                }
                byte[] mac = intf.getHardwareAddress();
                if (mac == null)
                    return "";
                StringBuilder buf = new StringBuilder();
                for (int idx = 0; idx < mac.length; idx++)
                    buf.append(String.format("%02X:", mac[idx]));
                if (buf.length() > 0)
                    buf.deleteCharAt(buf.length() - 1);
                return buf.toString();
            }
        } catch (Exception ex) {
        } // for now eat exceptions
        return "";
        /*try {
        // this is so Linux hack
        return loadFileAsString("/sys/class/net/" +interfaceName + "/address").toUpperCase().trim();
        } catch (IOException ex) {
        return null;
        }*/
    }
}

Related

1. getMacAddress()
2. getMacAddress()
3. getMacAddress()
4. getMACAddress()
5. getMacAddress(String host)
6. getMacAddress(String separator)
7. getMacAddressBytes()
8. getMacAddresses()
9. getMacAddressString()