get All Local Host Names - Java Network

Java examples for Network:Host

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Description

get All Local Host Names

Demo Code

/* InetAddressUtil//from w w  w .  j a va2s  . co  m
 *
 * Created on Nov 19, 2004
 *
 * Copyright (C) 2004 Internet Archive.
 *
 * This file is part of the Heritrix web crawler (crawler.archive.org).
 *
 * Heritrix is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * any later version.
 *
 * Heritrix 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 Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser Public License
 * along with Heritrix; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
//package com.java2s;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;

import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;

public class Main {
    public static void main(String[] argv) throws Exception {
        System.out.println(getAllLocalHostNames());
    }

    /**
     * @return All known local names for this host or null if none found.
     */
    public static List<String> getAllLocalHostNames() {
        List<String> localNames = new ArrayList<String>();
        Enumeration<NetworkInterface> e = null;
        try {
            e = NetworkInterface.getNetworkInterfaces();
        } catch (SocketException exception) {
            throw new RuntimeException(exception);
        }
        for (; e.hasMoreElements();) {
            for (Enumeration<InetAddress> ee = e.nextElement()
                    .getInetAddresses(); ee.hasMoreElements();) {
                InetAddress ia = ee.nextElement();
                if (ia != null) {
                    if (ia.getHostName() != null) {
                        localNames.add(ia.getCanonicalHostName());
                    }
                    if (ia.getHostAddress() != null) {
                        localNames.add(ia.getHostAddress());
                    }
                }
            }
        }
        final String localhost = "localhost";
        if (!localNames.contains(localhost)) {
            localNames.add(localhost);
        }
        final String localhostLocaldomain = "localhost.localdomain";
        if (!localNames.contains(localhostLocaldomain)) {
            localNames.add(localhostLocaldomain);
        }
        return localNames;
    }
}

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