Compare two IP address byte array, the length must be 4 or 16. - Java Network

Java examples for Network:IP Address

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Description

Compare two IP address byte array, the length must be 4 or 16.

Demo Code


//package com.java2s;

public class Main {


    /**//from w w  w.ja  va  2s.c  om
     * Compare two IP address byte array, the length must be 4 or 16.
     * @param address1
     * @param address2
     * @return
     */
    private static boolean ifSameIpAddress(byte[] address1, byte[] address2) {
        if (address1 == null && address2 == null)
            return true;

        if (address1 != null && address2 != null
                && address1.length == address2.length) {
            //this IPv4 address
            if (address1.length == 4) {
                int a = getInteger(address1);
                int b = getInteger(address2);
                return a == b;
            } else {
                for (int i = 0; i < 16; i++) {
                    if (address1[i] != address2[i])
                        return false;
                }
                return true;
            }
        }

        return false;

    }

    private static int getInteger(byte[] addr) {
        int address = 0;
        if (addr != null) {
            if (addr.length == 4) {
                address = addr[3] & 0xFF;
                address |= ((addr[2] << 8) & 0xFF00);
                address |= ((addr[1] << 16) & 0xFF0000);
                address |= ((addr[0] << 24) & 0xFF000000);
            }
        }
        return address;
    }
}

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