Java IP Address to Int IPV4AddressStrToInteger(String ipAddressStr)

Description

IPV Address Str To Integer

License

Apache License

Declaration

public static int IPV4AddressStrToInteger(String ipAddressStr) throws UnknownHostException 

Method Source Code

//package com.java2s;
/**/*from   w  ww  .  j a  v  a  2 s.  c om*/
 * Copyright 2008 - CommonCrawl Foundation
 * 
 * CommonCrawl licenses this file to you under the Apache License, 
 * Version 2.0 (the "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.net.UnknownHostException;

public class Main {
    private final static int INADDR4SZ = 4;

    public static int IPV4AddressStrToInteger(String ipAddressStr) throws UnknownHostException {
        return IPV4AddressToInteger(textToNumericFormatV4(ipAddressStr));
    }

    public static int IPV4AddressToInteger(byte[] addr) {

        int hostAddress = addr[3] & 0xFF;

        hostAddress |= ((addr[2] << 8) & 0xFF00);
        hostAddress |= ((addr[1] << 16) & 0xFF0000);
        hostAddress |= ((addr[0] << 24) & 0xFF000000);

        return hostAddress;
    }

    public static byte[] textToNumericFormatV4(String src) {
        if (src.length() == 0) {
            return null;
        }

        byte[] res = new byte[INADDR4SZ];
        String[] s = src.split("\\.", -1);
        long val;
        try {
            switch (s.length) {
            case 1:
                /*
                 * When only one part is given, the value is stored directly in the
                 * network address without any byte rearrangement.
                 */

                val = Long.parseLong(s[0]);
                if (val < 0 || val > 0xffffffffL)
                    return null;
                res[0] = (byte) ((val >> 24) & 0xff);
                res[1] = (byte) (((val & 0xffffff) >> 16) & 0xff);
                res[2] = (byte) (((val & 0xffff) >> 8) & 0xff);
                res[3] = (byte) (val & 0xff);
                break;
            case 2:
                /*
                 * When a two part address is supplied, the last part is interpreted
                 * as a 24-bit quantity and placed in the right most three bytes of
                 * the network address. This makes the two part address format
                 * convenient for specifying Class A network addresses as net.host.
                 */

                val = Integer.parseInt(s[0]);
                if (val < 0 || val > 0xff)
                    return null;
                res[0] = (byte) (val & 0xff);
                val = Integer.parseInt(s[1]);
                if (val < 0 || val > 0xffffff)
                    return null;
                res[1] = (byte) ((val >> 16) & 0xff);
                res[2] = (byte) (((val & 0xffff) >> 8) & 0xff);
                res[3] = (byte) (val & 0xff);
                break;
            case 3:
                /*
                 * When a three part address is specified, the last part is
                 * interpreted as a 16-bit quantity and placed in the right most two
                 * bytes of the network address. This makes the three part address
                 * format convenient for specifying Class B net- work addresses as
                 * 128.net.host.
                 */
                for (int i = 0; i < 2; i++) {
                    val = Integer.parseInt(s[i]);
                    if (val < 0 || val > 0xff)
                        return null;
                    res[i] = (byte) (val & 0xff);
                }
                val = Integer.parseInt(s[2]);
                if (val < 0 || val > 0xffff)
                    return null;
                res[2] = (byte) ((val >> 8) & 0xff);
                res[3] = (byte) (val & 0xff);
                break;
            case 4:
                /*
                 * When four parts are specified, each is interpreted as a byte of
                 * data and assigned, from left to right, to the four bytes of an IPv4
                 * address.
                 */
                for (int i = 0; i < 4; i++) {
                    val = Integer.parseInt(s[i]);
                    if (val < 0 || val > 0xff)
                        return null;
                    res[i] = (byte) (val & 0xff);
                }
                break;
            default:
                return null;
            }
        } catch (NumberFormatException e) {
            return null;
        }
        return res;
    }
}

Related

1. ipToInt(String address)
2. ipToInt(String ip)
3. ipToInt(String ipAddr)
4. IpToInt(String strIp)
5. ipToInteger(String ip)
6. IPV4AddressToInteger(byte[] addr)
7. ipV4ToInt(String addr)
8. ipv4ToInt(String addr)
9. ipv4ToInt(String address)