001    /**
002     * Copyright (c) 2000-2012 Liferay, Inc. All rights reserved.
003     *
004     * The contents of this file are subject to the terms of the Liferay Enterprise
005     * Subscription License ("License"). You may not use this file except in
006     * compliance with the License. You can obtain a copy of the License by
007     * contacting Liferay, Inc. See the License for the specific language governing
008     * permissions and limitations under the License, including but not limited to
009     * distribution rights of the Software.
010     *
011     *
012     *
013     */
014    
015    package com.liferay.portal.kernel.util;
016    
017    import com.liferay.portal.kernel.exception.SystemException;
018    
019    import java.net.Inet4Address;
020    import java.net.InetAddress;
021    import java.net.NetworkInterface;
022    
023    import java.util.Enumeration;
024    
025    /**
026     * @author Michael C. Han
027     * @author Shuyang Zhou
028     */
029    public class InetAddressUtil {
030    
031            public static String getLocalHostName() throws Exception {
032                    return LocalHostNameHolder._localHostName;
033            }
034    
035            public static InetAddress getLocalInetAddress() throws Exception {
036                    Enumeration<NetworkInterface> enu1 =
037                            NetworkInterface.getNetworkInterfaces();
038    
039                    while (enu1.hasMoreElements()) {
040                            NetworkInterface networkInterface = enu1.nextElement();
041    
042                            Enumeration<InetAddress> enu2 = networkInterface.getInetAddresses();
043    
044                            while (enu2.hasMoreElements()) {
045                                    InetAddress inetAddress = enu2.nextElement();
046    
047                                    if (!inetAddress.isLoopbackAddress() &&
048                                            (inetAddress instanceof Inet4Address)) {
049    
050                                            return inetAddress;
051                                    }
052                            }
053                    }
054    
055                    throw new SystemException("No local internet address");
056            }
057    
058            private static class LocalHostNameHolder {
059    
060                    private static final String _localHostName;
061    
062                    static {
063                            try {
064                                    InetAddress inetAddress = getLocalInetAddress();
065    
066                                    _localHostName = inetAddress.getHostName();
067                            }
068                            catch (Exception e) {
069                                    throw new ExceptionInInitializerError(e);
070                            }
071                    }
072    
073            }
074    
075    }