IP地址字符串与BigInteger的转换

/**
 * Copyright (c) 2010, 新浪网支付中心
 *      All rights reserved.
 *
 * Java IP地址字符串与BigInteger的转换,
 * 支持IPv6
 *
 */
 
import java.math.BigInteger;
import java.net.InetAddress;
import java.net.UnknownHostException;
 
/**
 * IP转换大数进行比较工具
 *
 * @author yuchao1@staff.sina.com.cn
 * @since 2011-03-17
 *
 */
public final class IpLimit {
    //存放IP范围的内引类
    class IpRange{
        private String[][] ipRange;
        public IpRange(String[][] ip ){
            this.ipRange = ip;         
        }
        public String getIpAt(int row,int column){
            return ipRange[row][column];
        }
         
    }
    /**
     * 防止被实例化
     */
    private IpLimit() {
    }
 
    /**
     * 将字符串形式的ip地址转换为BigInteger
     *
     * @param ipInString
     *            字符串形式的ip地址
     * @return 整数形式的ip地址
     */
    public static BigInteger StringToBigInt(String ipInString) {
        ipInString = ipInString.replace(" ", "");
        byte[] bytes;
        if (ipInString.contains(":"))
            bytes = ipv6ToBytes(ipInString);
        else
            bytes = ipv4ToBytes(ipInString);
        return new BigInteger(bytes);
    }
 
    /**
     * 将整数形式的ip地址转换为字符串形式
     *
     * @param ipInBigInt
     *            整数形式的ip地址
     * @return 字符串形式的ip地址
     */
    public static String BigIntToString(BigInteger ipInBigInt) {
        byte[] bytes = ipInBigInt.toByteArray();
        byte[] unsignedBytes = bytes;
 
        // 去除符号位
        try {
            String ip = InetAddress.getByAddress(unsignedBytes).toString();
            return ip.substring(ip.indexOf('/') + 1).trim();
        } catch (UnknownHostException e) {
            throw new RuntimeException(e);
        }
    }
 
    /**
     * ipv6地址转有符号byte[17]
     * @param   ipv6 字符串形式的IP地址
     * @return big integer number
     */
    private static byte[] ipv6ToBytes(String ipv6) {
        byte[] ret = new byte[17];
        ret[0] = 0;
        int ib = 16;
        boolean comFlag = false;// ipv4混合模式标记
        if (ipv6.startsWith(":"))// 去掉开头的冒号
            ipv6 = ipv6.substring(1);
        String groups[] = ipv6.split(":");
        for (int ig = groups.length - 1; ig > -1; ig--) {// 反向扫描
            if (groups[ig].contains(".")) {
                // 出现ipv4混合模式
                byte[] temp = ipv4ToBytes(groups[ig]);
                ret[ib--] = temp[4];
                ret[ib--] = temp[3];
                ret[ib--] = temp[2];
                ret[ib--] = temp[1];
                comFlag = true;
            } else if ("".equals(groups[ig])) {
                // 出现零长度压缩,计算缺少的组数
                int zlg = 9 - (groups.length + (comFlag ? 1 : 0));
                while (zlg-- > 0) {// 将这些组置0
                    ret[ib--] = 0;
                    ret[ib--] = 0;
                }
            } else {
                int temp = Integer.parseInt(groups[ig], 16);
                ret[ib--] = (byte) temp;
                ret[ib--] = (byte) (temp >> 8);
            }
        }
        return ret;
    }
 
    /**
     * ipv4地址转有符号byte[5]
     * @param ipv4 字符串的IPV4地址
     * @return big integer number
     */
    private static byte[] ipv4ToBytes(String ipv4) {
        byte[] ret = new byte[5];
        ret[0] = 0;
        // 先找到IP地址字符串中.的位置
        int position1 = ipv4.indexOf(".");
        int position2 = ipv4.indexOf(".", position1 + 1);
        int position3 = ipv4.indexOf(".", position2 + 1);
        // 将每个.之间的字符串转换成整型
        ret[1] = (byte) Integer.parseInt(ipv4.substring(0, position1));
        ret[2] = (byte) Integer.parseInt(ipv4.substring(position1 + 1,
                position2));
        ret[3] = (byte) Integer.parseInt(ipv4.substring(position2 + 1,
                position3));
        ret[4] = (byte) Integer.parseInt(ipv4.substring(position3 + 1));
        return ret;
    }
    /**
     *
     * @param tip   要限制的Ip 包括Ipv6
     * @param sip   限制的开始Ip
     * @param eip   限制的结束Ip
     * @return  Boolean true通过
     *      false 受限制
     */
    public static boolean IsIp(String tip,String[][] myRange){
        boolean flag = false;
        //tbig 要测试的大数
        BigInteger tbig = IpLimit.StringToBigInt(tip);
        int rangeLength = myRange.length;
         
        for(int i=0;i<rangeLength;i++)
        {
            for(int j=0;j<myRange[i].length;j++)
            {
                //开始大数sbig和ebig
                BigInteger sbig = IpLimit.StringToBigInt(myRange[i][j]);
                j = j+1;
                BigInteger ebig = IpLimit.StringToBigInt(myRange[i][j]);
                //将大数进行比较
                //如果相等则退出循环
                if((tbig.compareTo(sbig)) == 0){
                    flag = true;
                    break;
                }
                //如果不相等则比较大小，在区间内正常
                if(((tbig.compareTo(sbig)) == 1)
                        &&((tbig.compareTo(ebig)) == -1)){
                    flag = true;
                    break;
                }
                 
            }
        }
        return flag;
    }
    /**
     * 测试程序
     * @param args
     */
    public static void main(String args[]){
         
        /*
        String ip = new String("192.168.0.1");
        BigInteger number = IpLimit.StringToBigInt(ip);
        String sip = "192.168.10.0";
        String eip = "192.168.10.255";
        System.out.println("The number ="+number);
        boolean flag = false;
        flag = IpLimit.IsIp(ip, sip, eip);
        System.out.println("The int n="+flag);
        //System.out.println("the m ="+m);
         
        //String myip = IpLimit.BigIntToString(number);
        //System.out.println("The ipv4 ="+myip);
        String ip6 = "e80:a5eb:8fc8::7ec6:8027";
        //String ip6 = "21DA:D3:AD:2F3B::9C5A";
        BigInteger num = IpLimit.StringToBigInt(ip6);
        System.out.println("The Ipv6 number ="+num);
        String myip6 = IpLimit.BigIntToString(num);
        System.out.println("The IPv6 ="+myip6);
        */
         
        //单IP限制必须写全两个
        String[][] iplimit1 ={
                {"192.168.0.1","192.168.0.255"},
                {"10.210.71.0","10.210.71.255"},
                {"202.106.182.158","202.106.182.158"}
                };
        boolean flag = false;
        String ip = "202.106.182.158";
        flag = IpLimit.IsIp(ip, iplimit1);
        System.out.println("The first test ="+flag);
         
        String ip1 = "201.101.102.21";
        flag = IpLimit.IsIp(ip1, iplimit1);
        System.out.println("The other test ="+flag);
    }
}
 
本文转自：http://www.oschina.net/code/snippet_1434_3596
posted @ 2015-04-22 10:59  Rozdy  阅读(934)  评论(0)    收藏  举报