java如何获取客户端的mac地址

Java可以通过使用NetworkInterface类来获取客户端的MAC地址。以下是获取MAC地址的示例代码：

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 ip = InetAddress.getLocalHost();
            NetworkInterface network = NetworkInterface.getByInetAddress(ip);
            byte[] mac = network.getHardwareAddress();
            System.out.print("MAC address : ");
            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(sb.toString());
        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (SocketException e){
            e.printStackTrace();
        }
    }
}

这段代码将输出客户端的MAC地址。