Java Local Address Get getLocalAddressStrings()

Description

Return all valid IP addresses for this local host.

License

Open Source License

Exception

Parameter	Description
UnknownHostException	If the localhost name cannot be resolved.
SocketException	an exception

Return

a list of addresses represented as string or null in the event of an error.

Declaration

public static String[] getLocalAddressStrings() throws UnknownHostException, SocketException 

Method Source Code

//package com.java2s;
/*//from  ww  w . j a v a 2s. c  om
 * (C) Copyright IBM Corp. 2011
 *
 * LICENSE: Eclipse Public License v1.0
 * http://www.eclipse.org/legal/epl-v10.html
 */

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

public class Main {
    /** Reference to the local host address */
    private static InetAddress localAddress = null;

    /**
     * Return all valid IP addresses for this local host. 
     * Note: List can include both IPv4 and IPv6 addresses.
     * 
     * @return a list of addresses represented as string or null in the event of an error.
     * @throws UnknownHostException If the localhost name cannot be resolved.
     * @throws SocketException 
     */
    public static String[] getLocalAddressStrings() throws UnknownHostException, SocketException {
        String[] localAddressStrings = null;

        if (localAddress != null) {
            InetAddress[] allMyAddresses = getLocalAddresses();
            if (allMyAddresses != null) {
                localAddressStrings = new String[allMyAddresses.length];
                for (int y = 0; y < allMyAddresses.length; y++) {
                    localAddressStrings[y] = allMyAddresses[y].getHostAddress();
                }
            }
        }

        return localAddressStrings;
    }

    /**
     * Return all valid IP addresses for this local host. 
     * Note: List can include both IPv4 and IPv6 addresses.
     * 
     * @return a list of InetAddress objects or null in the event of an error.
     * @throws UnknownHostException If the localhost name cannot be resolved.
     * @throws SocketException if an error occurs getting the list of local interfaces
     */
    public static InetAddress[] getLocalAddresses() throws UnknownHostException, SocketException {
        List<InetAddress> allMyAddresses = new ArrayList<InetAddress>();

        if (localAddress != null) {

            Enumeration<NetworkInterface> localInterfaces = getLocalInterfaces();
            Enumeration<InetAddress> interfaceAddresses = null;
            while (localInterfaces.hasMoreElements()) {
                /* get the set of addresses for each interface */
                interfaceAddresses = localInterfaces.nextElement().getInetAddresses();
                while (interfaceAddresses.hasMoreElements()) {
                    allMyAddresses.add(interfaceAddresses.nextElement());
                }
            }

            // allMyAddresses = InetAddress.getAllByName(localAddress.getHostName());
        }

        InetAddress[] addresses = allMyAddresses.toArray(new InetAddress[allMyAddresses.size()]);
        return addresses;
    }

    /**
     * Return the set of network interfaces for the local host.
     * 
     * @return an enumeration of the interfaces or null otherwise.
     * @throws SocketException if an error occurs getting the interface list.
     */
    public static Enumeration<NetworkInterface> getLocalInterfaces() throws SocketException {
        return NetworkInterface.getNetworkInterfaces();
    }
}

Related

1. getLocalAddresses()
2. getLocalAddresses()
3. getLocalAddresses()
4. getLocalAddresses()
5. getLocalAddressFromNetworkInterfacesListeningOnPort(int pPort)
6. getLocalAddressWithMulticast()
7. getLocalAddrs()
8. getLocalInet4Address()
9. getLocalInet4Address()