手机访问网站获取外网IP

哈哈，这个说白了就是手机后台访问网站，再解析获得的数据

app: http://fir.im/dpxu　可以下载看看效果

书接上文：http://blog.csdn.net/i_do_can/article/details/50421882

android手机联网，所以开启一个异步任务执行后台程序

public class IpAddressInfo extends AsyncTask<String, Integer, StringBuffer>

现在推荐的一种手机访问网络获取网页数据的方式是：URLConnection
给一个网址，有get .post 方式连接网络，如果只是一个网址没多少数据，这俩是一样的，post 可以传的参数数据量多一些

给出两种方式联网的函数

public void doGetURL(String url) throws Exception {

        URL localURL = new URL(url);

        URLConnection connection = localURL.openConnection();
        HttpURLConnection httpURLConnection = (HttpURLConnection)connection;

        httpURLConnection.setRequestProperty("Accept-Charset", "utf-8");
        httpURLConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

        if (httpURLConnection.getResponseCode() >= 300) {
            throw new Exception("HTTP Request is not success, Response code is " + httpURLConnection.getResponseCode());
        }

        inputStream = httpURLConnection.getInputStream();
        inputStreamReader = new InputStreamReader(inputStream);
        reader = new BufferedReader(inputStreamReader);

        while ((tempLine = reader.readLine()) != null) {
            tempHTML.append(tempLine);
        }

    }
    private void doPostURL(String url) throws Exception{
        URL localURL = new URL(url);
        URLConnection connection = localURL.openConnection();
        HttpURLConnection httpURLConnection = (HttpURLConnection)connection;

        httpURLConnection.setDoOutput(true);
        httpURLConnection.setRequestMethod("POST");
        httpURLConnection.setRequestProperty("Accept-Charset", "utf-8");
        httpURLConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
        httpURLConnection.setRequestProperty("Content-Length", String.valueOf(url.length()));

        outputStream = httpURLConnection.getOutputStream();
        outputStreamWriter = new OutputStreamWriter(outputStream);

        outputStreamWriter.write(url.toString());
        outputStreamWriter.flush();

        if (httpURLConnection.getResponseCode() >= 300) {
            throw new Exception("HTTP Request is not success, Response code is " + httpURLConnection.getResponseCode());
        }
        inputStream = httpURLConnection.getInputStream();
        inputStreamReader = new InputStreamReader(inputStream);
        reader = new BufferedReader(inputStreamReader);

        while ((tempLine = reader.readLine()) != null) {
            tempHTML.append(tempLine);
        }
    }

我访问的是 https://www.apnic.net/apnic-info/whois_search/your-ip

这个网页很奇怪，他的IP 我一直 获取不出来，只能得到IP的其他相关信息，而且网址也不是这个，我给出他的那个网址：

这只是我个人的获取，如果涉及到相关利益，我表示很抱歉，希望大家不要把这个网址商业使用

IP的获取淘宝有个貌似高大上的方式，就是极度不稳定：http://ip.taobao.com/service/getIpInfo2.php?ip=myip

之所以说看着”高大上“，是因为返回的是JSON串，需要用JSONObject解析，加上”貌似“是因为太不稳定啦

后台调用的代码：

public static String GetNetIp2() throws  Exception{
        String IP = "";

        String address = "http://ip.taobao.com/service/getIpInfo2.php?ip=myip";
        URL url = new URL(address);
        HttpURLConnection connection = (HttpURLConnection) url
                .openConnection();
        connection.setUseCaches(false);

        if (connection.getResponseCode() == HttpURLConnection.HTTP_OK)
        {
            InputStream in = connection.getInputStream();

            // 将流转化为字符串
            BufferedReader reader = new BufferedReader(
                    new InputStreamReader(in));

            String tmpString = "";
            StringBuilder retJSON = new StringBuilder();
            while ((tmpString = reader.readLine()) != null)
            {
                retJSON.append(tmpString + "\n");
            }

            JSONObject jsonObject = new JSONObject(retJSON.toString());
            String code = jsonObject.getString("code");
            if (code.equals("0"))
            {
                JSONObject data = jsonObject.getJSONObject("data");
                IP = data.getString("ip") + "(" + data.getString("country")
                        + data.getString("area") + "区"
                        + data.getString("region") + data.getString("city")
                        + data.getString("isp") + ")";

            }
            else
            {
                IP = "";
            }
        }
        else
        {
            IP = "";
        }
        return IP;
    }

无意中解析网站源码时发现这样一个网址： http://1212.ip138.com/ic.asp，同样的，这只是我个人的获取，只是我个人的测试使用，非商业，如果涉及到相关利益，我表示很抱歉，希望大家不要把这个网址商业使用

获取IP就极其简单啦

 <span style="white-space:pre">		</span>line = null;
            // 从反馈的结果中提取出IP地址
             int start = strber.indexOf("[");

             int end = strber.indexOf("]" );

            line =strber.substring(start + 1 ,end);

对了，异步任务处理完后

<span style="white-space:pre">	</span>/**
	 * onPostExecute方法用于在执行完后台任务后更新UI,显示结果  EditText
	 */
	@Override
	protected void onPostExecute(StringBuffer result) {
		// 判断是否为null，若不为null，则在页面显示HTML代码
		if (result != null) {

		<span style="white-space:pre">	</span>edtHTTP.setText(result);

		}
		super.onPostExecute(result);
	}

OK ,基本完成啦

源码下载：http://download.csdn.net/detail/i_do_can/9381118