根據IP地址獲取用戶的MAC地址Java代碼

[Java]代碼    

/**
     * 根據IP地址獲取mac地址
     * @param ipAddress 127.0.0.1
     * @return
     * @throws SocketException
     * @throws UnknownHostException
     */
    public static String getLocalMac(String ipAddress) throws SocketException,
            UnknownHostException {
        // TODO Auto-generated method stub
        String str = "";
        String macAddress = "";
        final String LOOPBACK_ADDRESS = "127.0.0.1";
        // 如果為127.0.0.1,則獲取本地MAC地址。
        if (LOOPBACK_ADDRESS.equals(ipAddress)) {
            InetAddress inetAddress = InetAddress.getLocalHost();
            // 貌似此方法需要JDK1.6。
            byte[] mac = NetworkInterface.getByInetAddress(inetAddress)
                    .getHardwareAddress();
            // 下面代碼是把mac地址拼裝成String
            StringBuilder sb = new StringBuilder();
            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
            macAddress = sb.toString().trim().toUpperCase();
            return macAddress;
        } else {
            // 獲取非本地IP的MAC地址
            try {
                System.out.println(ipAddress);
                Process p = Runtime.getRuntime()
                        .exec("nbtstat -A " + ipAddress);
                System.out.println("===process=="+p);
                InputStreamReader ir = new InputStreamReader(p.getInputStream());

                BufferedReader br = new BufferedReader(ir);

                while ((str = br.readLine()) != null) {
                    if(str.indexOf("MAC")>1){
                        macAddress = str.substring(str.indexOf("MAC")+9, str.length());
                        macAddress = macAddress.trim();
                        System.out.println("macAddress:" + macAddress);
                        break;
                    }
                }
                p.destroy();
                br.close();
                ir.close();
            } catch (IOException ex) {
            }
            return macAddress;
        }
    }