get Local IPs - Java Network

Java examples for Network:IP Address

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Description

get Local IPs

Demo Code

/**/*from   w  w  w.  ja v  a 2  s .c o m*/
 * Copyright (c) 2009 - 2011 AppWork UG(haftungsbeschr?nkt) <e-mail@appwork.org>
 * 
 * This file is part of org.appwork.utils.net.httpconnection
 * 
 * This software is licensed under the Artistic License 2.0,
 * see the LICENSE file or http://www.opensource.org/licenses/artistic-license-2.0.php
 * for details
 */
import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.LinkedHashSet;
import java.util.List;

public class Main{
    public static List<InetAddress> getLocalIPs() {
        return HTTPProxyUtils.getLocalIPs(false);
    }
    public static List<InetAddress> getLocalIPs(final boolean allowLoopback) {
        final LinkedHashSet<InetAddress> ipsLocal = new LinkedHashSet<InetAddress>();
        try {
            final Enumeration<NetworkInterface> nets = NetworkInterface
                    .getNetworkInterfaces();
            while (nets.hasMoreElements()) {
                /* find all network interfaces and their addresses */
                NetworkInterface cur = nets.nextElement();
                if (!cur.isUp()) {
                    continue;
                }
                if (cur.isLoopback() && allowLoopback == false) {
                    continue;
                }
                Enumeration<InetAddress> addrs = cur.getInetAddresses();
                InetAddress addr;
                while (addrs.hasMoreElements()) {
                    addr = addrs.nextElement();
                    if (addr == null) {
                        continue;
                    }
                    /* only show ipv4 addresses and non loopback */
                    if (!(addr instanceof Inet4Address)) {
                        continue;
                    }
                    ipsLocal.add(addr);
                }
                /* find all subinterfaces for each network interface, eg. eth0.1 */
                final Enumeration<NetworkInterface> nets2 = cur
                        .getSubInterfaces();
                while (nets2.hasMoreElements()) {
                    cur = nets2.nextElement();
                    if (!cur.isUp()) {
                        continue;
                    }
                    if (cur.isLoopback() && allowLoopback == false) {
                        continue;
                    }
                    addrs = cur.getInetAddresses();
                    while (addrs.hasMoreElements()) {
                        addr = addrs.nextElement();
                        if (addr == null) {
                            continue;
                        }
                        /* only show ipv4 addresses and non loopback */
                        if (!(addr instanceof Inet4Address)) {
                            continue;
                        }
                        ipsLocal.add(addr);
                    }
                }
            }
        } catch (final Throwable e) {
            e.printStackTrace();
        }
        return Collections.unmodifiableList(new ArrayList<InetAddress>(
                ipsLocal));
    }
}

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