/**
* 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 [email protected]
* @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