這一段一直研究UPNP協議，搞得頭都快炸了，找到一個upnp的jar包，感覺對發現InternetGatewayDevice非常方便。下面寫了一個小程序，是發現路由器并進行端口映射的。

package com.example.laozhou.upnptest;import android.content.Context; import android.net.wifi.WifiInfo; import android.net.wifi.WifiManager; import android.os.Bundle; import android.os.Message; import android.support.v7.app.AppCompatActivity; import android.util.Log;import net.sbbi.upnp.impls.InternetGatewayDevice; import net.sbbi.upnp.messages.ActionResponse; import net.sbbi.upnp.messages.UPNPResponseException;import java.io.IOException; import java.net.InetAddress; import java.net.NetworkInterface; import java.util.Enumeration; import java.util.Locale;public class Main2Activity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main2);new Thread(discoverUPNP).start();}Runnable discoverUPNP = new Runnable() {@Overridepublic void run() {int discoveryTiemout = 5000; // 5 secstry {System.out.println("Looking for Internet Gateway Device...");InternetGatewayDevice[] IGDs = InternetGatewayDevice.getDevices(discoveryTiemout);if (IGDs != null) {for (int i = 0; i < IGDs.length; i++) {InternetGatewayDevice testIGD = IGDs[i];System.out.println("\t\nFound device " + testIGD.getIGDRootDevice().getModelName());System.out.println("External IP address: " + testIGD.getExternalIPAddress());// now let's open the portint portNum = 12345;System.out.println("\nTrying to map dummy port " + portNum + "..."); // String localHostIP = getIpAddress();String localHostIP = "192.168.2.201";System.out.println("localHostIP " + localHostIP);boolean mapped = testIGD.addPortMapping("chinavideo mapping", null, portNum, portNum, localHostIP, 0, "TCP");System.out.println("AddPortState: " + mapped);if (mapped) {System.out.println("Port " + portNum + " mapped to " + localHostIP);System.out.println("Current mappings count is " + testIGD.getNatMappingsCount());// checking on the deviceActionResponse resp = testIGD.getSpecificPortMappingEntry(null, portNum, "TCP");if (resp != null) {System.out.println("Port " + portNum + " mapping confirmation received from device");}}}System.out.println("\nDone.");} else {System.out.println("Unable to find IGD on your network");}} catch (IOException ex) {System.err.println("IOException occured during discovery or ports mapping " + ex.getMessage());} catch (UPNPResponseException respEx) {System.err.println("UPNP device unhappy " + respEx.getDetailErrorCode() + " " + respEx.getDetailErrorDescription());}}};private String getIpAddress() {WifiManager wifiManager = (WifiManager) Main2Activity.this.getSystemService(WIFI_SERVICE);WifiInfo wifiInfo = wifiManager.getConnectionInfo();int ipAddress = wifiInfo.getIpAddress();String ipaddress = String.format("%d.%d.%d.%d",(ipAddress & 0xff), (ipAddress >> 8 & 0xff), (ipAddress >> 16 & 0xff),(ipAddress >> 24 & 0xff));return ipaddress;}public String getLocalIpAddress(){try {for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces();en.hasMoreElements();) {NetworkInterface intf = en.nextElement();for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {InetAddress inetAddress = enumIpAddr.nextElement();if (!inetAddress.isLoopbackAddress()) {Log.d("ipAddress:",inetAddress.getHostAddress().toString());return inetAddress.getHostAddress().toString();}}}} catch (Exception ex) {Log.e("IP Address", ex.toString());}return null;} }
其中端口號可以自己定義，因為我本機沒有可測試接口，所以映射了局域網內一臺機器的的接口到路由器。

所用包為?upnplib-mobile.jar

總結

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