java获取客户端mac地址

在Java中，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 GetMacAddress {
    public static void main(String[] args) {
        try {
            InetAddress ipAddress = InetAddress.getLocalHost();
            NetworkInterface networkInterface = NetworkInterface.getByInetAddress(ipAddress);
            byte[] macAddressBytes = networkInterface.getHardwareAddress();
            StringBuilder stringBuilder = new StringBuilder();
            for (int i = 0; i < macAddressBytes.length; i++) {
                stringBuilder.append(String.format("%02X%s", macAddressBytes[i], (i < macAddressBytes.length - 1) ? "-" : ""));
            }
            System.out.println("MAC Address: " + stringBuilder.toString());
        } catch (UnknownHostException | SocketException e) {
            e.printStackTrace();
        }
    }
}

这段代码首先获取了本机的InetAddress对象，然后通过它获取对应的NetworkInterface对象，再从NetworkInterface对象中获取MAC地址的字节数组，最后将字节数组转换为十六进制格式的字符串表示MAC地址。