Java IP Address Get getAllHostAddresses(boolean ignoreLoopback, boolean ignoreIP6)

Description

Returns all IP addresses that could be found on this machine.

License

Open Source License

Parameter

Parameter	Description
ignoreLoopback	ignore loopback addresses
ignoreIP6	ignore IPv6 addresses

Return

all IP addresses found that adhere to the restrictions.

Declaration

private static InetAddress[] getAllHostAddresses(boolean ignoreLoopback, boolean ignoreIP6) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;

import java.util.ArrayList;

import java.util.Enumeration;
import java.util.List;

public class Main {
    /**//from w  ww. j a  va2s .c om
     * Returns all IP addresses that could be found on this machine. If desired,
     * loopback and/or IPv6 addresses can be ignored.
     * 
     * @param ignoreLoopback
     *            ignore loopback addresses
     * @param ignoreIP6
     *            ignore IPv6 addresses
     * 
     * @return all IP addresses found that adhere to the restrictions.
     */
    private static InetAddress[] getAllHostAddresses(boolean ignoreLoopback, boolean ignoreIP6) {

        ArrayList<InetAddress> list = new ArrayList<InetAddress>();

        try {
            Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
            while (interfaces.hasMoreElements()) {
                NetworkInterface networkInterface = interfaces.nextElement();
                getAllHostAddresses(networkInterface, list, ignoreLoopback, ignoreIP6);
            }
        } catch (SocketException e) {
            // IGNORE
        }

        return list.toArray(new InetAddress[list.size()]);
    }

    /**
     * Adds all IP addresses that are bound to a specific network interface to a
     * list. If desired, loopback and/or IPv6 addresses can be ignored.
     * 
     * @param nw
     *            the network interface for which the addresses are determined
     * @param target
     *            the list used to store the addresses
     * @param ignoreLoopback
     *            ignore loopback addresses
     * @param ignoreIP6
     *            ignore IPv6 addresses
     */
    private static void getAllHostAddresses(NetworkInterface nw, List<InetAddress> target, boolean ignoreLoopback,
            boolean ignoreIP6) {

        Enumeration<InetAddress> e2 = nw.getInetAddresses();

        while (e2.hasMoreElements()) {

            InetAddress tmp = e2.nextElement();

            boolean t1 = !ignoreLoopback || !tmp.isLoopbackAddress();
            boolean t2 = !ignoreIP6 || (tmp instanceof Inet4Address);

            if (t1 && t2) {
                target.add(tmp);
            }
        }
    }
}

Related

1. getAllHostIPs(String hostName)
2. getAllInternalHostIPs(String hostName)
3. getAllIp()
4. getAllIPAddresses()