android獲取wifi外網ip的方法

<span style="font-size:18px;">	// 獲取外網IP
	public static String GetNetIp() {
		URL infoUrl = null;
		InputStream inStream = null;
		try {
			// http://iframe.ip138.com/ic.asp
			// infoUrl = new URL("http://city.ip138.com/city0.asp");
			infoUrl = new URL("http://ip38.com");
			URLConnection connection = infoUrl.openConnection();
			HttpURLConnection httpConnection = (HttpURLConnection) connection;
			int responseCode = httpConnection.getResponseCode();
			if (responseCode == HttpURLConnection.HTTP_OK) {
				inStream = httpConnection.getInputStream();
				BufferedReader reader = new BufferedReader(
						new InputStreamReader(inStream, "utf-8"));
				StringBuilder strber = new StringBuilder();
				String line = null;
				while ((line = reader.readLine()) != null)
					strber.append(line + "\n");
				inStream.close();
				// 從反饋的結果中提取出IP地址
				// int start = strber.indexOf("[");
				// Log.d("zph", "" + start);
				// int end = strber.indexOf("]", start + 1);
				// Log.d("zph", "" + end);
				line = strber.substring(378, 395);
				line.replaceAll(" ", "");
				return line;
			}
		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return null;
	}</span>

另有一個獲取外網IP的高端方法

public static String GetNetIp()
{
String IP = "";
try
{
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();

// 將流轉化爲字符串
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") + "區"
+ data.getString("region") + data.getString("city")
+ data.getString("isp") + ")";

Log.e("提示", "您的IP地址是：" + IP);
}
else
{
IP = "";
Log.e("提示", "IP接口異常，無法獲取IP地址！");
}
}
else
{
IP = "";
Log.e("提示", "網絡連接異常，無法獲取IP地址！");
}
}
catch (Exception e)
{
IP = "";
Log.e("提示", "獲取IP地址時出現異常，異常信息是：" + e.toString());
}
return IP;
}