Java IP Address Get getIPV4MainAddress(NetworkInterface ni)

Description

Return the main ip V4 address associated with the ni

License

Apache License

Parameter

Parameter	Description
ni	network interface we are looking for

Exception

Parameter	Description
IOException	an exception

Return

the ip address, null if no ip address is associated with the current network interface.

Declaration

public static Inet4Address getIPV4MainAddress(NetworkInterface ni) throws IOException 

Method Source Code

//package com.java2s;
/*//from w w w.  j a  v  a 2  s .  c  o m
 * Copyright (c) 2012-2017 ZoxWeb.com LLC.
 *
 * 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.io.IOException;
import java.net.Inet4Address;

import java.net.InetAddress;

import java.net.NetworkInterface;

import java.util.ArrayList;

import java.util.Enumeration;

public class Main {
    /**
     * Return the main ip V4 address associated with the ni
     * 
     * @param ni
     *            network interface we are looking for
     * @return the ip address, null if no ip address is associated with the
     *         current network interface.
     * @throws IOException
     */
    public static Inet4Address getIPV4MainAddress(String ni) throws IOException {
        return getIPV4MainAddress(NetworkInterface.getByName(ni));

    }

    /**
     * Return the main ip V4 address associated with the ni
     * 
     * @param ni
     *            network interface we are looking for
     * @return the ip address, null if no ip address is associated with the
     *         current network interface.
     * @throws IOException
     */
    public static Inet4Address getIPV4MainAddress(NetworkInterface ni) throws IOException {
        Inet4Address[] addresses = getIPV4AllAddresses(ni);

        if (addresses != null && addresses.length > 0) {
            return addresses[addresses.length - 1];
        }

        return null;
    }

    /**
     * Return all the ip V4 addresses associated with the ni
     * 
     * @param ni
     *            network interface we are looking for
     * @return the ip addresses, empty array of no ips
     * @throws IOException
     */
    public static Inet4Address[] getIPV4AllAddresses(String ni) throws IOException {
        return getIPV4AllAddresses(NetworkInterface.getByName(ni));

    }

    /**
     * Return all the ip V4 addresses associated with the ni
     * 
     * @param ni
     *            network interface we are looking for
     * @return the ip addresses, empty array of no ips
     * @throws IOException
     */
    public static Inet4Address[] getIPV4AllAddresses(NetworkInterface ni) throws IOException {
        ArrayList<Inet4Address> v = new ArrayList<Inet4Address>();
        for (Enumeration<InetAddress> e = ni.getInetAddresses(); e.hasMoreElements();) {
            InetAddress addr = e.nextElement();
            if (addr instanceof Inet4Address)
                v.add((Inet4Address) addr);
        }

        return (Inet4Address[]) v.toArray(new Inet4Address[v.size()]);
    }
}

Related

1. getIPs()
2. getIPs()
3. getIPv4Address()
4. getIPV4Address(List addresses)
5. getIPv4Address(NetworkInterface iface)
6. getIPv4MulticastGroup(int hash)
7. getIPV4NetwprkOrder(String theIp)
8. getIPV6AddrArray(String s)
9. getIPV6AllAddresses(NetworkInterface ni)