根据IP地址获取用户的MAC地址

/** * 根据IP地址获取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 stubString 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StringStringBuilder 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 ? 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;}}