确定设备公共IP

Question

有谁知道如何获得Android设备的公共IP地址？

我正在尝试运行服务器套接字(只是试验简单的p2p).

这需要通知本地和远程用户的公共IP.我找到了这个帖子如何从代码中获取设备的IP地址？其中包含指向如何获取IP 的文章(http://www.droidnova.com/get-the-ip-address-of-your-device,304.html)的链接.然而,这通过路由器连接时返回本地IP,我想获得实际的公共IP.

TIA

Answer 1

只需访问http://automation.whatismyip.com/n09230945.asp并刮掉它？

whatismyip.com非常适合获取IP,尽管该网站要求您每5分钟只打一次.

2015年2月更新

WhatIsMyIp现在公开了一个可以使用的开发人员API.

Answer 2

从checkip.org解析公共IP地址(使用JSoup):

public static String getPublicIP() throws IOException
{
    Document doc = Jsoup.connect("http://www.checkip.org").get();
    return doc.getElementById("yourip").select("h1").first().select("span").text();
}

Answer 3

我用这个函数获取公网IP地址，先检查是否有连通性然后请求返回公网IP地址的请求

public static String getPublicIPAddress(Context context) {
    //final NetworkInfo info = NetworkUtils.getNetworkInfo(context);

    ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    final NetworkInfo info = cm.getActiveNetworkInfo();

    RunnableFuture<String> futureRun = new FutureTask<>(new Callable<String>() {
        @Override
        public String call() throws Exception {
            if ((info != null && info.isAvailable()) && (info.isConnected())) {
                StringBuilder response = new StringBuilder();

                try {
                    HttpURLConnection urlConnection = (HttpURLConnection) (
                            new URL("http://checkip.amazonaws.com/").openConnection());
                    urlConnection.setRequestProperty("User-Agent", "Android-device");
                    //urlConnection.setRequestProperty("Connection", "close");
                    urlConnection.setReadTimeout(15000);
                    urlConnection.setConnectTimeout(15000);
                    urlConnection.setRequestMethod("GET");
                    urlConnection.setRequestProperty("Content-type", "application/json");
                    urlConnection.connect();

                    int responseCode = urlConnection.getResponseCode();

                    if (responseCode == HttpURLConnection.HTTP_OK) {

                        InputStream in = new BufferedInputStream(urlConnection.getInputStream());
                        BufferedReader reader = new BufferedReader(new InputStreamReader(in));

                        String line;
                        while ((line = reader.readLine()) != null) {
                            response.append(line);
                        }

                    }
                    urlConnection.disconnect();
                    return response.toString();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            } else {
                //Log.w(TAG, "No network available INTERNET OFF!");
                return null;
            }
            return null;
        }
    });

    new Thread(futureRun).start();

    try {
        return futureRun.get();
    } catch (InterruptedException | ExecutionException e) {
        e.printStackTrace();
        return null;
    }

}

当然可以优化，我把它留给贡献他们解决方案的大师。

Answer 4

要查找公共IP，您需要致电http://www.whatismyip.com/之类的外部服务，并获取外部IP作为响应。