1. public static String getV4IP(){

   String ip = "";

   String chinaz = "http://ip.chinaz.com";

   StringBuilder inputLine = new StringBuilder();

   String read = "";

   URL url = null;

   HttpURLConnection urlConnection = null;

   BufferedReader in = null;

   try {

   url = new URL(chinaz);

   urlConnection = (HttpURLConnection) url.openConnection();

   in = new BufferedReader( new InputStreamReader(urlConnection.getInputStream(),"UTF-8"));

   while((read=in.readLine())!=null){

   inputLine.append(read+"\r\n");

   }

   //System.out.println(inputLine.toString());

   } catch (MalformedURLException e) {

   e.printStackTrace();

   } catch (IOException e) {

   e.printStackTrace();

   }finally{

   if(in!=null){

   try {

   in.close();

   } catch (IOException e) {

   // TODO Auto-generated catch block

   e.printStackTrace();

   }

   }

   }

   Pattern p = Pattern.compile("\\<dd class\\=\"fz24\">(.*?)\\<\\/dd>");

   Matcher m = p.matcher(inputLine.toString());

   if(m.find()){

   String ipstr = m.group(1);

   ip = ipstr;

   //System.out.println(ipstr);

   }

   return ip;