java获取本机外网ip

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;