java– 如何获取Android上本地网络中所有设备的IP地址和名称

概述我想用java看到我网络上的所有连接设备,但是我无法让它工作.我在下面附上了一些截图,说明我希望如何输出.我想要名称(例如“TPLinkRouter”或“Nexus5X”)和IP地址.我在谷歌和stackoverflow上搜索了很多,但似乎没有什么对我有用.即使是GitHub也没有有效的代码.我尝试搜索UPnP,

我想用java看到我网络上的所有连接设备,但是我无法让它工作.我在下面附上了一些截图,说明我希望如何输出.我想要名称(例如“TP link Router”或“Nexus 5X”)和IP地址.

我在谷歌和stackoverflow上搜索了很多,但似乎没有什么对我有用.即使是GitHub也没有有效的代码.我尝试搜索UPnP,局域网,子网等,但一无所获.

InetAddress localhost = InetAddress.getLocalHost();byte[] ip = localhost.getAddress();for (int i = 1; i <= 254; i++) {    ip[3] = (byte)i;    InetAddress address = InetAddress.getByAddress(ip);    if (address.isReachable(1000)) {        System.out.println(address + address.getHostAddress() + address.getAddress() + address.getHostname() + address.getCanonicalHostname());    }}

事实上,我确实找到了一个重复(某种)问题,但一年多来都没有回答. Source

解决方法:

主要问题是你抓错了IP地址. InetAddress.getLocalHost()返回127.0.0.1,那只是你的设备.

改为使用Wifi IP地址：

ConnectivityManager cm = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);NetworkInfo activeNetwork = cm.getActiveNetworkInfo();WifiManager wm = (WifiManager)context.getSystemService(Context.WIFI_SERVICE);WifiInfo connectionInfo = wm.getConnectionInfo();int ipAddress = connectionInfo.getIpAddress();String ipString = Formatter.formatIpAddress(ipAddress);

这是一个快速而肮脏的AsyncTask,它可以做到这一点：

static class NetworkSniffTask extends AsyncTask<VoID, VoID, VoID> {  private static final String TAG = Constants.TAG + "nstask";  private WeakReference<Context> mContextRef;  public NetworkSniffTask(Context context) {    mContextRef = new WeakReference<Context>(context);  }  @OverrIDe  protected VoID doInBackground(VoID... voIDs) {    Log.d(TAG, "Let's sniff the network");    try {      Context context = mContextRef.get();      if (context != null) {        ConnectivityManager cm = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);        NetworkInfo activeNetwork = cm.getActiveNetworkInfo();        WifiManager wm = (WifiManager)context.getSystemService(Context.WIFI_SERVICE);        WifiInfo connectionInfo = wm.getConnectionInfo();        int ipAddress = connectionInfo.getIpAddress();        String ipString = Formatter.formatIpAddress(ipAddress);        Log.d(TAG, "activeNetwork: " + String.valueOf(activeNetwork));        Log.d(TAG, "ipString: " + String.valueOf(ipString));        String prefix = ipString.substring(0, ipString.lastIndexOf(".") + 1);        Log.d(TAG, "prefix: " + prefix);        for (int i = 0; i < 255; i++) {          String testIp = prefix + String.valueOf(i);          InetAddress address = InetAddress.getByname(testIp);          boolean reachable = address.isReachable(1000);          String hostname = address.getCanonicalHostname();          if (reachable)            Log.i(TAG, "Host: " + String.valueOf(hostname) + "(" + String.valueOf(testIp) + ") is reachable!");        }      }    } catch (Throwable t) {      Log.e(TAG, "Well that's not good.", t);    }  return null;}

以下是权限：

<uses-permission androID:name="androID.permission.INTERNET" /><uses-permission androID:name="androID.permission.ACCESS_WIFI_STATE" /><uses-permission androID:name="androID.permission.ACCESS_NETWORK_STATE" />

并非所有路由器都允许这样做,因此以另一种方式获取名称是将mac地址发送到API并获得品牌名称作为回报.

String macAdress = "5caafd1b0019";String dataUrl = "http://API.macvendors.com/" + macAdress;httpURLConnection connection = null;try {    URL url = new URL(dataUrl);    connection = (httpURLConnection) url.openConnection();    connection.setRequestMethod("POST");    connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");    connection.setDoinput(true);    connection.setDoOutput(true);    DataOutputStream wr = new DataOutputStream(connection.getoutputStream());    wr.flush();    wr.close();    inputStream is = connection.getinputStream();    BufferedReader rd = new BufferedReader(new inputStreamReader(is));    StringBuffer response = new StringBuffer();    String line;    while ((line = rd.readline()) != null) {response.append(line);response.append('\r');}    rd.close();    String responseStr = response.toString();    Log.d("Server response", responseStr);} catch (Exception e) {e.printstacktrace();} finally {if (connection != null) {connection.disconnect();}}

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