android课程设计笔记草稿

安卓获取内网和外网IP（java同理）

安卓中，需要开启权限

在AndroidMainfest.xml中添加

<uses-permission android:name="android.permission.INTERNET"/>

获取内网和公网ip 转自大佬

/**
	 * 获取外网的IP(要访问Url，要放到后台线程里处理)
	 * 
	 * @Title: GetNetIp
	 * @Description:
	 * @param @return
	 * @return String
	 * @throws
	 */
	public static String GetNetIp() {
		URL infoUrl = null;
		InputStream inStream = null;
		String ipLine = "";
		HttpURLConnection httpConnection = null;
		try {
			infoUrl = new URL("http://ip168.com/");
			URLConnection connection = infoUrl.openConnection();
			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");
 
				Pattern pattern = Pattern
						.compile("((?:(?:25[0-5]|2[0-4]\\d|((1\\d{2})|([1-9]?\\d)))\\.){3}(?:25[0-5]|2[0-4]\\d|((1\\d{2})|([1-9]?\\d))))");
				Matcher matcher = pattern.matcher(strber.toString());
				if (matcher.find()) {
					ipLine = matcher.group();
				}
			}
 
		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				inStream.close();
				httpConnection.disconnect();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return ipLine;
	}
 
	/**
	 * 获取本地IP
	 * 
	 * @return
	 */
	public static String getLocalIpAddress() {
		try {
			Enumeration<NetworkInterface> en = NetworkInterface
					.getNetworkInterfaces();
			while (en.hasMoreElements()) {
				NetworkInterface ni = en.nextElement();
				Enumeration<InetAddress> enIp = ni.getInetAddresses();
				while (enIp.hasMoreElements()) {
					InetAddress inet = enIp.nextElement();
					if (!inet.isLoopbackAddress()
							&& (inet instanceof Inet4Address)) {
						return inet.getHostAddress().toString();
					}
				}
			}
		} catch (SocketException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
 
		return "0";
	}