使用Java在本地计算机上获取MAC地址

Question

我可以用

ip = InetAddress.getLocalHost();
NetworkInterface.getByInetAddress(ip);

获取mac地址,但是如果我在离线机器中使用此代码则不起作用.

那么,我怎样才能获得Mac地址？

Answer 1

使用Java 6+,您可以使用NetworkInterface.getHardwareAddress.

请记住,计算机可以没有网卡,特别是如果它是嵌入式或虚拟的.它也可以有多个.您可以获得所有网卡的列表NetworkInterface.getNetworkInterfaces().

Answer 2

通过我在这里找到的所有可能的解决方案和另一个回复,我将为我的解决方案做出贡献.您需要使用包含"ip"或"mac"的String指定参数,具体取决于您需要检查的内容.如果计算机没有接口,那么它将返回一个包含null的String,否则将返回一个包含你要求的字符串(ip地址或mac).

如何使用它:

System.out.println("Ip: " + GetNetworkAddress.GetAddress("ip"));
System.out.println("Mac: " + GetNetworkAddress.GetAddress("mac"));

结果(如果计算机有网卡):

Ip: 192.168.0.10 
Mac: 0D-73-ED-0A-27-44

结果(如果计算机没有网卡):

Ip: null
Mac: null

这是代码:

import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.Enumeration;

public class GetNetworkAddress {

    public static String GetAddress(String addressType) {
        String address = "";
        InetAddress lanIp = null;
        try {

            String ipAddress = null;
            Enumeration<NetworkInterface> net = null;
            net = NetworkInterface.getNetworkInterfaces();

            while (net.hasMoreElements()) {
                NetworkInterface element = net.nextElement();
                Enumeration<InetAddress> addresses = element.getInetAddresses();

                while (addresses.hasMoreElements() && element.getHardwareAddress().length > 0 && !isVMMac(element.getHardwareAddress())) {
                    InetAddress ip = addresses.nextElement();
                    if (ip instanceof Inet4Address) {

                        if (ip.isSiteLocalAddress()) {
                            ipAddress = ip.getHostAddress();
                            lanIp = InetAddress.getByName(ipAddress);
                        }

                    }

                }
            }

            if (lanIp == null)
                return null;

            if (addressType.equals("ip")) {

                address = lanIp.toString().replaceAll("^/+", "");

            } else if (addressType.equals("mac")) {

                address = getMacAddress(lanIp);

            } else {

                throw new Exception("Specify \"ip\" or \"mac\"");

            }

        } catch (UnknownHostException ex) {

            ex.printStackTrace();

        } catch (SocketException ex) {

            ex.printStackTrace();

        } catch (Exception ex) {

            ex.printStackTrace();

        }

        return address;

    }

    private static String getMacAddress(InetAddress ip) {
        String address = null;
        try {

            NetworkInterface network = NetworkInterface.getByInetAddress(ip);
            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) ? "-" : ""));
            }
            address = sb.toString();

        } catch (SocketException ex) {

            ex.printStackTrace();

        }

        return address;
    }

    private static boolean isVMMac(byte[] mac) {
        if(null == mac) return false;
        byte invalidMacs[][] = {
                {0x00, 0x05, 0x69},             //VMWare
                {0x00, 0x1C, 0x14},             //VMWare
                {0x00, 0x0C, 0x29},             //VMWare
                {0x00, 0x50, 0x56},             //VMWare
                {0x08, 0x00, 0x27},             //Virtualbox
                {0x0A, 0x00, 0x27},             //Virtualbox
                {0x00, 0x03, (byte)0xFF},       //Virtual-PC
                {0x00, 0x15, 0x5D}              //Hyper-V
        };

        for (byte[] invalid: invalidMacs){
            if (invalid[0] == mac[0] && invalid[1] == mac[1] && invalid[2] == mac[2]) return true;
        }

        return false;
    }

}

更新时间02/05/2017:感谢@mateuscb在帖子中如何确定Java中的Internet网络接口,遗憾的是之前没有在该帖子上获得任何upvote,但他为此更新做出了贡献.

该方法已被改进,以跳过虚拟机网卡(最流行的VM软件)

Answer 3

至于计算机处于脱机状态,它通常没有分配IP,因为DHCP被广泛使用......

对于标题中的问题: NetworkInterface.getHardwareAddress()