Java Broadcast Address Get getBroadcastAddresses(int port)

Description

Get broadcast addresses.

License

Open Source License

Parameter

Parameter	Description
port	port to be added to get socket address.

Return

array of broadcast addresses with given port.

Declaration

public static InetSocketAddress[] getBroadcastAddresses(int port) 

Method Source Code

//package com.java2s;
/*/*w w  w.  j  a  v a  2 s  . co m*/
 * Copyright (c) 2004 by Cosylab
 *
 * The full license specifying the redistribution, modification, usage and other
 * rights and obligations is included with the distribution of this project in
 * the file "LICENSE-CAJ". If the license is not included visit Cosylab web site,
 * <http://www.cosylab.com>.
 *
 * THIS SOFTWARE IS PROVIDED AS-IS WITHOUT WARRANTY OF ANY KIND, NOT EVEN THE
 * IMPLIED WARRANTY OF MERCHANTABILITY. THE AUTHOR OF THIS SOFTWARE, ASSUMES
 * _NO_ RESPONSIBILITY FOR ANY CONSEQUENCE RESULTING FROM THE USE, MODIFICATION,
 * OR REDISTRIBUTION OF THIS SOFTWARE.
 */

import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.InterfaceAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;

import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

public class Main {
    /**
     * Get broadcast addresses.
     * @param port port to be added to get socket address.
     * @return array of broadcast addresses with given port.
     */
    public static InetSocketAddress[] getBroadcastAddresses(int port) {
        Enumeration<NetworkInterface> nets;
        try {
            nets = NetworkInterface.getNetworkInterfaces();
        } catch (SocketException se) {
            // fallback
            return new InetSocketAddress[] { new InetSocketAddress("255.255.255.255", port) };
        }

        ArrayList<InetSocketAddress> list = new ArrayList<InetSocketAddress>(10);

        while (nets.hasMoreElements()) {
            NetworkInterface net = nets.nextElement();
            try {
                if (net.isUp()) {
                    List<InterfaceAddress> interfaceAddresses = net.getInterfaceAddresses();
                    if (interfaceAddresses != null)
                        for (InterfaceAddress addr : interfaceAddresses)
                            if (addr.getBroadcast() != null) {
                                InetSocketAddress isa = new InetSocketAddress(addr.getBroadcast(), port);
                                if (!list.contains(isa))
                                    list.add(isa);
                            }
                }
            } catch (Throwable th) {
                // some methods throw exceptions, some return null (and they shouldn't)
                // noop, skip that interface
            }
        }

        InetSocketAddress[] retVal = new InetSocketAddress[list.size()];
        list.toArray(retVal);
        return retVal;
    }

    /**
     * Get a set of broadcast addresses.
     * @return set of broadcast addresses.
     */
    public static Set<InetAddress> getBroadcastAddresses() {

        Set<InetAddress> set = new HashSet<InetAddress>(10);

        Enumeration<NetworkInterface> nets;
        try {
            nets = NetworkInterface.getNetworkInterfaces();
        } catch (SocketException se) {
            // fallback
            try {
                set.add(InetAddress.getByAddress(new byte[] { (byte) 255, (byte) 255, (byte) 255, (byte) 255 }));
            } catch (UnknownHostException e) {
                // noop
            }
            return set;
        }

        while (nets.hasMoreElements()) {
            NetworkInterface net = nets.nextElement();
            try {
                if (net.isUp()) {
                    List<InterfaceAddress> interfaceAddresses = net.getInterfaceAddresses();
                    if (interfaceAddresses != null)
                        for (InterfaceAddress addr : interfaceAddresses) {
                            InetAddress ba = addr.getBroadcast();
                            if (ba != null) // Set class takes care of duplicates
                                set.add(ba);
                        }
                }
            } catch (Throwable th) {
                // some methods throw exceptions, some return null (and they shouldn't)
                // noop, skip that interface
            }
        }

        return set;
    }
}

Related

1. getBroadcastAddress()
2. getBroadcastAddresses()
3. getBroadcastAddresses()
4. getBroadcastAddresses()
5. getBroadcastAddresses(int port)