Java IP Address Get getIPAddress()

Description

get IP Address

License

Apache License

Declaration

static String getIPAddress() throws Exception 

Method Source Code

//package com.java2s;
/*//w w w .ja v  a  2  s . co m
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;

public class Main {
    static String getIPAddress() throws Exception {
        List<InetAddress> ipAddresses = new ArrayList<InetAddress>();
        String ipAddress = null;

        Enumeration<NetworkInterface> e = NetworkInterface
                .getNetworkInterfaces();
        while (e.hasMoreElements()) {
            NetworkInterface ni = e.nextElement();
            // Clustering doesn't work for loop-back addresses, so we are not interested
            // we are not interested in inactive interfaces either
            if (ni.isLoopback() || !ni.isUp())
                continue;

            Enumeration<InetAddress> e2 = ni.getInetAddresses();
            while (e2.hasMoreElements()) {
                InetAddress ip = e2.nextElement();
                ipAddresses.add(ip);
            }
        }

        if (ipAddresses.isEmpty()) {
            return null;
        } else {
            for (InetAddress ip : ipAddresses) {
                if (ip instanceof Inet4Address) {
                    ipAddress = ip.getHostAddress();
                    break;
                }
            }
        }

        if (ipAddress == null) {
            ipAddress = ipAddresses.get(0).getHostAddress();
        }

        return ipAddress;
    }
}

Related

1. getIpAddress()
2. getIpAddress()
3. getIPAddress()
4. getIpAddress()
5. getIpAddress()
6. getIPAddress()
7. getIpAddress()
8. getIPAddress()
9. getIPAddress(boolean useIPv4)