怎么实现自动获取ip地址和mac地址

public static String getMacAddressIP(String remotePcIP) {
  String str = "";
  String macAddress = "";
  try {
   Process pp = Runtime.getRuntime().exec("nbtstat -A " + remotePcIP);
   InputStreamReader ir = new InputStreamReader(pp.getInputStream());
   LineNumberReader input = new LineNumberReader(ir);
   for (int i = 1; i < 100; i++) {
    str = input.readLine();
    if (str != null) {
     if (str.indexOf("MAC Address") > 1) {
      macAddress = str.substring(
        str.indexOf("MAC Address") + 14, str.length());
      break;
     }
    }
   }
  } catch (IOException ex) {
  }
  return macAddress;
 }