Selects the default network interface - Java Network

Java examples for Network:Network Interface

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Description

Selects the default network interface

Demo Code


//package com.java2s;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.util.Enumeration;

public class Main {
    public static void main(String[] argv) throws Exception {
        System.out.println(getDefaultNetworkInterface());
    }/*ww  w  .  j  a v a 2s .  c o m*/

    /**
     * Selects the default network interface
     * @return network interface
     */
    public static NetworkInterface getDefaultNetworkInterface() {
        try {
            Enumeration<NetworkInterface> networks = NetworkInterface
                    .getNetworkInterfaces();
            while (networks.hasMoreElements()) {
                NetworkInterface ni = networks.nextElement();
                Enumeration<InetAddress> addresses = ni.getInetAddresses();
                boolean hasAddress = false;
                while (addresses.hasMoreElements()) {
                    InetAddress ia = addresses.nextElement();
                    if (!(ia.isAnyLocalAddress() || ia.isLinkLocalAddress()
                            || ia.isLoopbackAddress()
                            || ia.isSiteLocalAddress() || ni
                                .isPointToPoint())) {
                        if (!hasAddress) {
                            return ni;
                        }
                    }
                }
            }
        } catch (Exception ex) {

        }
        return null;
    }
}

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