Java Host Address Get getHostAddress()

Description

get Host Address

License

Open Source License

Declaration

public static String getHostAddress() throws SocketException 

Method Source Code

//package com.java2s;
/*//from   w w w.  j  a va  2  s. c  o m
 *
 * This file is part of the XiPKI project.
 * Copyright (c) 2014 - 2015 Lijun Liao
 * Author: Lijun Liao
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
 * THE AUTHOR LIJUN LIAO. LIJUN LIAO DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
 * OF THIRD PARTY RIGHTS.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the XiPKI software without
 * disclosing the source code of your own applications.
 *
 * For more information, please contact Lijun Liao at this
 * address: lijun.liao@gmail.com
 */

import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.Enumeration;
import java.util.LinkedList;
import java.util.List;

public class Main {
    public static String getHostAddress() throws SocketException {
        List<String> addresses = new LinkedList<>();

        Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
        while (interfaces.hasMoreElements()) {
            NetworkInterface n = (NetworkInterface) interfaces.nextElement();
            Enumeration<InetAddress> ee = n.getInetAddresses();
            while (ee.hasMoreElements()) {
                InetAddress i = (InetAddress) ee.nextElement();
                if (i instanceof Inet4Address) {
                    addresses.add(((Inet4Address) i).getHostAddress());
                }
            }
        }

        for (String addr : addresses) {
            if (addr.startsWith("192.") == false && addr.startsWith("127.") == false) {
                return addr;
            }
        }

        for (String addr : addresses) {
            if (addr.startsWith("127.") == false) {
                return addr;
            }
        }

        if (addresses.size() > 0) {
            return addresses.get(0);
        } else {
            try {
                return InetAddress.getLocalHost().getHostAddress();
            } catch (UnknownHostException e) {
                return "UNKNOWN";
            }
        }
    }
}

Related

1. getHost(final String address)
2. getHostAddress()
3. getHostAddress()
4. getHostAddress()
5. getHostAddress()
6. getHostAddress()
7. getHostAddress()
8. getHostAddress()
9. getHostAddress()