/** * 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