用户的MAC地址如何利用java实现获取

 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";  // 如果为127.0.0.1,则获取本地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();   // 下面代码是把mac地址拼装成String   StringBuilder sb = new StringBuilder();   for (int i = 0; i < mac.length; i++) {    if (i != 0) {     sb.append("-");    }    // mac[i] & 0xFF 是为了把byte转化为正整数    String s = Integer.toHexString(mac[i] & 0xFF);    sb.append(s.length() == 1 &#63; 0 + s : s);   }   // 把字符串所有小写字母改为大写成为正规的mac地址并返回   macAddress = sb.toString().trim().toUpperCase();   return macAddress;  } else {   // 获取非本地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;  } }