java获取本机MAC地址

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

  public static void main(String[] args) throws SocketException, UnknownHostException {
//        StringBuilder sb = new StringBuilder();
//        Enumeration allNetInterfaces = NetworkInterface.getNetworkInterfaces();
//        byte[] mac = null;
//        while (allNetInterfaces.hasMoreElements()) {
//            NetworkInterface netInterface = allNetInterfaces.nextElement();
//            if (netInterface.isLoopback() || netInterface.isVirtual() || netInterface.isPointToPoint() || !netInterface.isUp()) {
//                continue;
//            } else {
//                mac = netInterface.getHardwareAddress();
//                if (mac != null) {
//                    for (int i = 0; i < mac.length; i++) {
//                        sb.append(String.format("%02X%s", mac[i], (i < mac.length - 1) ? "-" : "n"));
//                    }
//                }
//            }
//        }
//        System.out.println(sb.toString());
//        InetAddress ia = InetAddress.getLocalHost();
//        System.out.println(ia);
        System.out.println("本机mac地址：" + getLocalMac());

    }

    private static String getLocalMac() throws SocketException, UnknownHostException {
        InetAddress ipAddress = InetAddress.getLocalHost();
        byte[] mac = NetworkInterface.getByInetAddress(ipAddress).getHardwareAddress();
        // System.out.println("mac数组长度："+mac.length);
        StringBuffer sb = new StringBuffer("");
        for (int i = 0; i < mac.length; i++) {
            if (i != 0) {
                sb.append("-");
            }
            //字节转换为整数
            int temp = mac[i] & 0xff;
            String str = Integer.toHexString(temp);
            if (str.length() == 1) {
                sb.append("0" + str);
            } else {
                sb.append(str);
            }
        }
        return sb.toString().toUpperCase();
    }

代码注释部分是获取多个mac地址，没注释的是正常获取mac地址的。