Java IP Address Get getLocalIpAddress()

Description

get Local Ip Address

License

Apache License

Exception

Parameter	Description
UnknownHostException	an exception

Declaration

public static InetAddress getLocalIpAddress()
        throws UnknownHostException 

Method Source Code

//package com.java2s;
/*/*from   www .  ja  v  a2  s  .c om*/
 * Copyright (C) 2016 Maximilian Pawlidi
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.net.InetAddress;
import java.net.NetworkInterface;

import java.net.UnknownHostException;
import java.util.Enumeration;

public class Main {
    /**
     * 
     * @return
     * @throws UnknownHostException
     */
    public static InetAddress getLocalIpAddress()
            throws UnknownHostException {
        try {
            InetAddress localAddress = null;
            // load all existed network interfaces
            for (Enumeration<?> networkInterfaces = NetworkInterface
                    .getNetworkInterfaces(); networkInterfaces
                    .hasMoreElements();) {
                NetworkInterface networkInterface = (NetworkInterface) networkInterfaces
                        .nextElement();

                for (Enumeration<?> ipAddresses = networkInterface
                        .getInetAddresses(); ipAddresses.hasMoreElements();) {
                    InetAddress ipAddress = (InetAddress) ipAddresses
                            .nextElement();
                    if (!ipAddress.isLoopbackAddress()) {
                        if (ipAddress.isSiteLocalAddress()) {
                            return ipAddress;
                        } else if (localAddress == null) {
                            localAddress = ipAddress;
                        }
                    }
                }
            }
            if (localAddress != null) {
                return localAddress;
            }
            // try to get localhost address
            localAddress = InetAddress.getLocalHost();
            if (localAddress == null) {
                throw new UnknownHostException(
                        "Could not load localhost ip address");
            }
            return localAddress;
        } catch (Exception e) {
            UnknownHostException unknownHostException = new UnknownHostException(
                    "Could not load localhost ip address " + e);
            unknownHostException.initCause(e);
            throw unknownHostException;
        }
    }
}

Related

1. getLocalIp()
2. getLocalIp(final boolean useIpv6)
3. getLocalIPAddress()
4. getLocalIPAddress()
5. getLocalIPAddress()
6. getLocalIpAddress()
7. getLocalIPAddresses()
8. getLocalIpAddresses()
9. getLocalIPAddresses()