Java Local Host Get getLocalHost()

Description

Returns the non-localhost IP address of the current machine.

License

Open Source License

Return

IP address

Declaration

public static String getLocalHost() 

Method Source Code

//package com.java2s;
/*/*from   www .  jav a 2  s . c  o m*/
 * This file is part of Gradoop.
 *
 * Gradoop is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Gradoop 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Gradoop. If not, see <http://www.gnu.org/licenses/>.
 */

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.Enumeration;

public class Main {
    /**
     * local host ip
     */
    static final String LOCAL_HOST = "127.0.1.1";
    /**
     * regex representing an IP address
     */
    private static final String IP_PATTERN = "^(?:[0-9]{1,3}\\.){3}[0-9]{1,3}$";

    /**
     * Returns the non-localhost IP address of the current machine.
     *
     * @return IP address
     */
    public static String getLocalHost() {

        String address = null;

        try {
            address = InetAddress.getLocalHost().getHostAddress();

            if (address.equals(LOCAL_HOST)) {
                Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();

                boolean found = false;

                while (interfaces.hasMoreElements() && !found) {
                    NetworkInterface e = interfaces.nextElement();
                    Enumeration<InetAddress> addresses = e.getInetAddresses();

                    while (addresses.hasMoreElements()) {
                        String candidate = addresses.nextElement().getHostAddress();

                        if (candidate.matches(IP_PATTERN) && !candidate.equals(LOCAL_HOST)) {
                            address = candidate;
                            found = true;
                            break;
                        }
                    }
                }
            }
        } catch (UnknownHostException | SocketException e) {
            e.printStackTrace();
        }
        return address;
    }
}

Related

1. getLocalHost()
2. getLocalhost()
3. getLocalHost()
4. getLocalHost()
5. getLocalHost()
6. getLocalHost()
7. getLocalHost()
8. getLocalHost()
9. getLocalHost()