Java InetAddress to inetAddress2Int(InetAddress addr)

Description

Converts IPv4 InetAddress to 32 bits int.

License

Open Source License

Parameter

Parameter	Description
addr	IPv4 address object

Exception

Parameter	Description
NullPointerException	<tt>addr</tt> is <tt>null</tt>.
IllegalArgumentException	the address is not IPv4 (Inet4Address).

Return

32 bits int

Declaration

public static final int inetAddress2Int(InetAddress addr) 

Method Source Code

//package com.java2s;
/*//from  ww w  . ja v  a2  s .  c  o m
 *   This file is part of dhcp4java, a DHCP API for the Java language.
 *   (c) 2006 Stephan Hadinger
 *
 *   This library is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU Lesser General Public
 *   License as published by the Free Software Foundation; either
 *   version 2.1 of the License, or (at your option) any later version.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *   Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public
 *   License along with this library; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

import java.net.Inet4Address;
import java.net.InetAddress;

public class Main {
    /**
     * Converts IPv4 <tt>InetAddress</tt> to 32 bits int.
     * 
     * @param addr IPv4 address object
     * @return 32 bits int
     * @throws NullPointerException <tt>addr</tt> is <tt>null</tt>.
     * @throws IllegalArgumentException the address is not IPv4 (Inet4Address).
     */
    public static final int inetAddress2Int(InetAddress addr) {
        if (!(addr instanceof Inet4Address)) {
            throw new IllegalArgumentException("Only IPv4 supported");
        }

        byte[] addrBytes = addr.getAddress();
        return ((addrBytes[0] & 0xFF) << 24) | ((addrBytes[1] & 0xFF) << 16) | ((addrBytes[2] & 0xFF) << 8)
                | ((addrBytes[3] & 0xFF));
    }
}

Related

1. addressToLong(InetAddress address)
2. InetAddressToInt(InetAddress ip)
3. inetAddressToThriftBinary(InetAddress inetAddress)
4. ipv4AddressToInt(InetAddress addr)
5. str(InetAddress address)