獲得Android裝置公網所在的ip

/** *  * @param ipaddr  * @return public ip */String GetNetIp(String ipaddr){  URL infoUrl = null;  InputStream inStream = null;  try {  infoUrl = new URL(ipaddr);  URLConnection connection = infoUrl.openConnection();  HttpURLConnection httpConnection = (HttpURLConnection)connection;  int responseCode = httpConnection.getResponseCode();  if(responseCode == HttpURLConnection.HTTP_OK)  {      inStream = httpConnection.getInputStream();     BufferedReader reader = new BufferedReader(new InputStreamReader(inStream,"utf-8"));  StringBuilder strber = new StringBuilder();  String line = null;  while ((line = reader.readLine()) != null)   strber.append(line );  inStream.close();  return strber.toString();               }  } catch (MalformedURLException e) {  // TODO Auto-generated catch block   e.printStackTrace();  } catch (IOException e) {  // TODO Auto-generated catch block   e.printStackTrace();  }  return "";  }  

傳入的地址可以是

http://automation.whatismyip.com/n09230945.asp