Convert an IPv4 INET address to an integer. - Java Network

Java examples for Network:IP Address

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Description

Convert an IPv4 INET address to an integer.

Demo Code

/*/*from  w  ww. ja  va2 s.c  o 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.
 */
//package com.java2s;
import java.net.Inet6Address;
import java.net.InetAddress;

public class Main {
    /** 
     * Convert an IPv4 INET address to an integer.
     * @param addr   IPv4 INET address.
     * @return integer representation of a given address.
     * @throws IllegalArgumentException if the address is really an IPv6 address
     */
    public static int ipv4AddressToInt(InetAddress addr) {

        if (addr instanceof Inet6Address)
            throw new IllegalArgumentException(
                    "IPv6 address used in IPv4 context");

        byte[] a = addr.getAddress();

        int res = ((a[0] & 0xFF) << 24) | ((a[1] & 0xFF) << 16)
                | ((a[2] & 0xFF) << 8) | (a[3] & 0xFF);

        return res;
    }
}

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