Java pour obtenir mon adresse IP

    String ip;
    try {
        Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
        while (interfaces.hasMoreElements()) {
            NetworkInterface iface = interfaces.nextElement();
            //filters out 127.0.0.1 and inactive interfaces
            if (iface.isLoopback() || !iface.isUp())
                continue;

            Enumeration<InetAddress> addresses = iface.getInetAddresses();
            while(addresses.hasMoreElements()) {
                InetAddress addr = addresses.nextElement();
                ip = addr.getHostAddress();
                System.out.println(iface.getDisplayName() + " " + ip);
            }
        }
    } catch (SocketException e) {
        throw new RuntimeException(e);
    }

Eu le même problème, trouvé la solution sur cette page: http://mrhawy.blogspot.it/2012/05/how-to-get-your-external-ip-address-in.html

    public String getIpAddress() throws MalformedURLException, IOException {
  URL myIP = new URL("http://api.externalip.net/ip/");
  BufferedReader in = new BufferedReader(
                       new InputStreamReader(myIP.openStream())
                      );
  return in.readLine();
  }

eu des soucis avec ce code sur le long terme, plusieurs fois dans une semaine, le serveur ne veut pas répondre.

nouvelle solution:

public static String getIpAddress() 
{ 
        URL myIP;
        try {
            myIP = new URL("http://api.externalip.net/ip/");

            BufferedReader in = new BufferedReader(
                    new InputStreamReader(myIP.openStream())
                    );
            return in.readLine();
        } catch (Exception e) 
        {
            try 
            {
                myIP = new URL("http://myip.dnsomatic.com/");

                BufferedReader in = new BufferedReader(
                        new InputStreamReader(myIP.openStream())
                        );
                return in.readLine();
            } catch (Exception e1) 
            {
                try {
                    myIP = new URL("http://icanhazip.com/");

                    BufferedReader in = new BufferedReader(
                            new InputStreamReader(myIP.openStream())
                            );
                    return in.readLine();
                } catch (Exception e2) {
                    e2.printStackTrace(); 
                }
            }
        }

    return null;
}

//This program is find your exact LAN(Local Machine on which your are       //runing this program) IP Address 
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;

public class GetMyIPAddress {
public static void main(String gks[]) throws SocketException{
    Enumeration e = NetworkInterface.getNetworkInterfaces();
    int ctr=0;
    while(e.hasMoreElements())
    {
        NetworkInterface n = (NetworkInterface) e.nextElement();
        Enumeration ee = n.getInetAddresses();
        while (ee.hasMoreElements() && ctr<3)
        {       ctr++;
            if(ctr==3)
                break;
                InetAddress i = (InetAddress) ee.nextElement();
                    if(ctr==2)
                         System.out.println(i.getHostAddress());

        }
    }
}

}

Voici ma démarche pour obtenir l'adresse IP.

1. Obtenir votre adresse de passerelle par défaut
2. Obtenir toutes les adresses dans votre PC
3. Maintenant dans votre IP(supposons que 192.168.100.4) et la passerelle par défaut IP(supposons que 192.168.100.1) ont 9 premiers chiffres de l'adresse doit être la même, alors quel IP qui complète ce critère est votre IP.

Veuillez voir ci-dessous pour code de travail.

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.StringTokenizer;
import java.util.TreeSet;
public class MyIpAddress {
public static void main(String[] args) {
//doPortForwarding();
MyIpAddress myIpAddress = new MyIpAddress();
//get default address
String yourIp = myIpAddress.getYourIp(myIpAddress
.getDefaultGateWayAddress());
System.out.println(yourIp);
//get
} //amin
//return ip address for which u need to do port forwarding
private String getYourIp(String defaultAddress) {
String temp = defaultAddress.substring(0, 11);
String ipToForward = "";
TreeSet<String> ipAddrs = getIpAddressList();
for (Iterator<String> iterator = ipAddrs.iterator(); iterator.hasNext();) {
String tempIp = iterator.next();
if (tempIp.contains(temp)) {
ipToForward = tempIp;
break;
}
}
return ipToForward;
}//ipForPortForwarding
//get the ipaddress list
private TreeSet<String> getIpAddressList() {
TreeSet<String> ipAddrs = new TreeSet<String>();
try {
Enumeration<NetworkInterface> interfaces = NetworkInterface
.getNetworkInterfaces();
while (interfaces.hasMoreElements()) {
NetworkInterface iface = interfaces.nextElement();
//filters out 127.0.0.1 and inactive interfaces
if (iface.isLoopback() || !iface.isUp())
continue;
Enumeration<InetAddress> addresses = iface.getInetAddresses();
while (addresses.hasMoreElements()) {
InetAddress addr = addresses.nextElement();
ipAddrs.add(addr.getHostAddress());
}//2 nd while
}//1 st while
} catch (SocketException e) {
//TODO Auto-generated catch block
e.printStackTrace();
}
return ipAddrs;
}//getIpAddressList
//get default gateway address in java
private String getDefaultGateWayAddress() {
String defaultAddress = "";
try {
Process result = Runtime.getRuntime().exec("netstat -rn");
BufferedReader output = new BufferedReader(new InputStreamReader(
result.getInputStream()));
String line = output.readLine();
while (line != null) {
if (line.contains("0.0.0.0")) {
StringTokenizer stringTokenizer = new StringTokenizer(line);
stringTokenizer.nextElement();//first string is 0.0.0.0
stringTokenizer.nextElement();//second string is 0.0.0.0
defaultAddress = (String) stringTokenizer.nextElement(); //this is our default address
break;
}
line = output.readLine();
}//while
} catch (IOException e) {
//TODO Auto-generated catch block
e.printStackTrace();
}
return defaultAddress;
}//getDefaultAddress
}