用 NetworkInterface 试试:

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

public class App{
    
   public static void main(String[] args){
        
    InetAddress ip;
    try {
            
        ip = InetAddress.getLocalHost();
        System.out.println("Current IP address : " + ip.getHostAddress());
        
        NetworkInterface network = NetworkInterface.getByInetAddress(ip);
            
        byte[] mac = network.getHardwareAddress();
            
        System.out.print("Current 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();
            
    }
        
   }

}