JAVA中怎么获取本机的公网IP

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代码如下

public static String getV4IP() {        String ip = "";        String chinaz = "ht" + "tp" + ":/" + "/i" + "p.ch" + "in" + "az." + "co" + "m";        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");                }        } catch (MalformedURLException e) {                e.printStackTrace();        } catch (IOException e) {                e.printStackTrace();        } finally {                if (in != null) {                        try {                                in.close();                        } catch (IOException e) {                                e.printStackTrace();                        }                }        }        Pattern p = Pattern.compile("\\
(.*?)\\<\\/dd>");        Matcher m = p.matcher(inputLine.toString());        if (m.find()) {                String ipstr = m.group(1);                ip = ipstr;        }        return ip;}

调用该方法，返回字符串：

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