Java IP Address to Long ipToLong(String addr)

Description

ip To Long

License

Open Source License

Declaration

public static long ipToLong(String addr) 

Method Source Code

//package com.java2s;

public class Main {
    private static final int SLASHNET_VALUE = 32;
    private static final int TWO_FIVE_SIX = 256;
    private static final int TWO_FIVE_FIVE = 255;
    private static final int THREE = 3;
    private static final String SLASH = "/";
    private static final int NUMBER_OF_BITS_IN_IP = 32;

    public static long ipToLong(String addr) {
        String ipAddress = addr;//from   w  w  w.j a  va 2 s .co m
        long netMask = 0;
        if (addr.contains(SLASH)) {
            String[] addressAndSubnet = addr.split(SLASH);
            netMask = addrsInSlashnet(Integer.valueOf(addressAndSubnet[1]));
            ipAddress = addressAndSubnet[0];
        }
        String[] addrArray = ipAddress.split("\\.");
        long num = 0;
        for (int i = 0; i < addrArray.length; i++) {
            try {
                if (Integer.parseInt(addrArray[i]) > TWO_FIVE_FIVE)
                    throw new IllegalArgumentException("IP address out of range");
                int power = THREE - i;
                num += Integer.parseInt(addrArray[i]) % TWO_FIVE_SIX * Math.pow(TWO_FIVE_SIX, power);
            } catch (NumberFormatException e) {
                throw new IllegalArgumentException(String.format("Failed to parse IP address %s", addr));
            }
        }
        // throw the ip on the back of the netmask.
        num = netMask << NUMBER_OF_BITS_IN_IP | num;
        return num;
    }

    public static int addrsInSlashnet(int slashnet) {
        int delta = SLASHNET_VALUE - slashnet;
        return (int) Math.pow(2, delta);
    }
}

Related

1. ip2Long(String ipaddress)
2. ip2Long(String ipAddress)
3. ipToLong(byte[] address)
4. ipToLong(byte[] octets)
5. ipToLong(final String addr)
6. ipTolong(String address)
7. ipToLong(String ip)
8. ipToLong(String ip)
9. ipToLong(String ip)