public static void main(String[] args) throws Exception {InetAddress ia = InetAddress.getLocalHost();System.out.println(getMACAddress(ia));}

private static String getMACAddress(InetAddress ia) throws Exception {// 獲得網絡接口對象（即網卡），并得到mac地址，mac地址存在于一個byte數組中。byte[] mac = NetworkInterface.getByInetAddress(ia).getHardwareAddress();// 下面代碼是把mac地址拼裝成StringStringBuffer sb = new StringBuffer();for (int i = 0; i < mac.length; i++) {if (i != 0) {sb.append("-");}// mac[i] & 0xFF 是為了把byte轉化為正整數String s = Integer.toHexString(mac[i] & 0xFF);sb.append(s.length() == 1 ? 0 + s : s);}// 把字符串所有小寫字母改為大寫成為正規的mac地址并返回return sb.toString().toUpperCase();}

public static void main(String[] args) throws Exception {getMac("192.168.1.186");}

public static String getMac(String ip){String str = null;String mac = null;try{Process p = Runtime.getRuntime().exec("nbtstat -A " + ip); InputStreamReader ir = new InputStreamReader(p.getInputStream(),"gbk"); LineNumberReader input = new LineNumberReader(ir); for (; true;) { str = input.readLine(); if (str != null) {if (str.indexOf("MAC 地址") > 1) {mac = str.substring(str.indexOf("MAC 地址") + 9);break; }}}System.out.println(mac);}catch(IOException e){e.printStackTrace();}return mac;}