IPV 6 IPV 4 javaを数字に変換

/**
 * 
 * author：[email protected]
 * created:2015 8 20    9:31:35  
 */
package blog;

import java.math.BigInteger;

/**
 * @author gxl
 *
 */
public class Ip2Int
{

	/**
	 * @param args
	 */
	public static void main(String[] args)
	{
		String ipv4 = "127.255.1.1", ipv6 = "fe80:0:0:0:d48a:e3be:7d9d:ffff";
		// IPV4 all 4*8 =32 bit
		// java int is 32 bit but cann't store this.(it's signed.)
		long k = ip2long(ipv4);
		System.out.println(k);
		System.out.println(Long.toBinaryString(k));
		System.out.println(long2ip(k));

		System.out.println("ipv6 start :" + ipv6);
		BigInteger big = ipv6toInt(ipv6);
		System.out.println(big.toString(16));
		System.out.println(int2ipv6(big));
		
		ipv6 = "fe80:0:0:0:d48a:e3be::ffff";
		System.out.println("ipv6 start :" + ipv6);
		big = ipv6toInt(ipv6);
		System.out.println(big.toString(16));
		System.out.println(int2ipv6(big));
	}

	public static long ip2long(String ipv4)
	{

		String[] splits = ipv4.split("\\.");
		long l = 0;
		l = l + (Long.valueOf(splits[0], 10)) << 24;
		l = l + (Long.valueOf(splits[1], 10) << 16);
		l = l + (Long.valueOf(splits[2], 10) << 8);
		// yunsuanfu youxianji
		l = l + (Long.valueOf(splits[3], 10));
		System.out.println(Long.toBinaryString(l));
		return l;
	}

	public static String long2ip(long l)
	{
		String ip = "";
		ip = ip + (l >>> 24);

		ip = ip + "." + ((0x00ffffff & l) >>> 16);
		ip = ip + "." + ((0x0000ffff & l) >>> 8);
		ip = ip + "." + (0x000000ff & l);
		return ip;
	}

	public static BigInteger ipv6toInt(String ipv6)
	{

		int compressIndex = ipv6.indexOf("::");
		if (compressIndex != -1)
		{
			String part1s = ipv6.substring(0, compressIndex);
			String part2s = ipv6.substring(compressIndex + 1);
			BigInteger part1 = ipv6toInt(part1s);
			BigInteger part2 = ipv6toInt(part2s);
			int part1hasDot = 0;
			char ch[] = part1s.toCharArray();
			for (char c : ch)
			{
				if (c == ':')
				{
					part1hasDot++;
				}
			}
			// ipv6 has most 7 dot
			return part1.shiftLeft(16 * (7 - part1hasDot )).add(part2);
		}
		String[] str = ipv6.split(":");
		BigInteger big = BigInteger.ZERO;
		for (int i = 0; i < str.length; i++)
		{
			//::1
			if (str[i].isEmpty())
			{
				str[i] = "0";
			}
			big = big.add(BigInteger.valueOf(Long.valueOf(str[i], 16))
			        .shiftLeft(16 * (str.length - i - 1)));
		}
		return big;
	}
	
	public static String int2ipv6(BigInteger big)
	{
		String str = "";
		BigInteger ff = BigInteger.valueOf(0xffff);
		for (int i = 0; i < 8 ; i++)
		{
			str = big.and(ff).toString(16) + ":" + str;
			
			big = big.shiftRight(16);
		}
		//the last :
		str = str.substring(0, str.length() - 1);
		
		return str.replaceFirst("(^|:)(0+(:|$)){2,8}", "::");
	}

}