java获取客户端mac地址

Java可以通过以下代码获取客户端的MAC地址：

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

public class MacAddress {

    public static void main(String[] args) {

        InetAddress ipAddress;
        try {
            ipAddress = InetAddress.getLocalHost();
            NetworkInterface network = NetworkInterface.getByInetAddress(ipAddress);

            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) ? "-" : ""));
            }
            System.out.println("MAC Address: " + sb.toString());

        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (SocketException e){
            e.printStackTrace();
        }

    }

}

这段代码运行后会输出当前机器的MAC地址。