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366 lines (344 loc) · 10.6 KB
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/*
* @Author: 阿拉斯加大闸蟹 hekuangsheng@163.com
* @Date: 2023-02-03 03:04:20
* @LastEditors: 阿拉斯加大闸蟹 hekuangsheng@163.com
* @LastEditTime: 2023-02-03 03:09:30
* @FilePath: /java-base/java-network/cidr.java
* @Description: 这是默认设置,请设置`customMade`, 打开koroFileHeader查看配置 进行设置: https://github.com/OBKoro1/koro1FileHeader/wiki/%E9%85%8D%E7%BD%AE
*/
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.regex.Pattern;
public class Cidr {
public static void main(String[] args) {
System.err.println(subnetDivide("117.72.16.0/23",9));
}
/***
* 判断一个数是否是2的次幂
* @param n
* @return
*/
public static boolean isPowerOfTwo(int n) {
String str = Integer.toBinaryString(n);
if(n < 1) {
return false;
} else if(str.lastIndexOf("1") == 0) {
return true;
} else {
return false;
}
}
// public static String toBinary(String str){ //把字符串转成字符数组
// char[] strChar=str.toCharArray();
// String result="";
// for(int i=0;i<strChar.length;i++){
// //toBinaryString(int i)返回变量的二进制表示的字符串
// //toHexString(int i) 八进制
// //toOctalString(int i) 十六进制
// result +=Integer.toBinaryString(strChar[i])+ " ";
// }
// return result;
// }
/***
* 大于等于2的次幂的最小值
* @param v 任意数
* @return
*/
public static int roundup_power_of_2(int v)
{
v--;
v |= v >> 1;
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v |= v >> 16;
v++;
return v;
}
/***
* 2的次幂
* @param n 次幂
* @return
*/
private static int calculate2Num(int n) {
if (n == 0) {
return 1;
}
return 2 * calculate2Num(n - 1);
}
/***
* 具体划分步骤
* @return
*/
public static List<String> divideByPow(String ips,int pow){
// Map<String,String> map=new HashMap<>();
List<String> ipList = new ArrayList<String>();
try {
if(ips ==null || "".equals(ips.trim()) || "null".equals(ips.trim())){
return ipList;
}
ips = ips.trim();
if(ips.indexOf("/")>0) {
String temp[] = ips.split("/");
if(temp.length == 2 && isIP(temp[0])){
String ip=temp[0];
String subnet=temp[1];
String ipBitStr = makeBinaryString( getIpFromString(ip).intValue());
int leg = ipBitStr.length();
int bitNum = Integer.parseInt(subnet);
String str0 = "00000000000000000000000000000000";
String str1 = "11111111111111111111111111111111";
if(bitNum <= 32){
String startIPBit = ipBitStr.substring(0, leg-(32-bitNum))+str0.substring(0, 32-bitNum);
String endIPBit = ipBitStr.substring(0, leg-(32-bitNum))+str1.substring(0, 32-bitNum);
Long startIPLong = getIpFromString(getIpStringFrom10bit(startIPBit));
Long endIPLong = getIpFromString(getIpStringFrom10bit(endIPBit));
Integer midNum=Integer.valueOf(1+str0.substring(0, 32-(bitNum+pow)), 2);
int subnetT=bitNum+pow;
for (int i = 0; i < calculate2Num(pow); i++) {
// map.put(getIpFromLong(startIPLong)+"/"+subnetT,getIpFromLong(startIPLong)+"/"+subnetT);
ipList.add(getIpFromLong(startIPLong)+"/"+subnetT);
startIPLong+=midNum;
}
}
// System.err.println(ipList+"--------------");
}
}
return ipList;
} catch (Exception e) {
return ipList;
}
}
/***
* 小于等于2的次幂的最大值
* @param subNum 划分数目
* @return pow 2的几次幂
*/
public static int judge(int subNum) {
int pow=0;
if(isPowerOfTwo(subNum)) {//是否是2的次幂
pow=(int) (Math.log(subNum)/Math.log(2));//2的几次幂
}else {
pow=roundup_power_of_2(subNum)/2;//小于等于2的次幂的最大值
pow=(int) (Math.log(pow)/Math.log(2));
}
return pow;
}
/***
* 子网划分
* @param ips 网段192.168.0.0/22
* @param subNum 子网划分数量
* @return
*/
public static List<String> subnetDivide(String ips,int subNum) {
List<String> ipList = new ArrayList<String>();
if(subNum>1){
int pow =judge(subNum);
int difference=subNum-calculate2Num(pow);
ipList =divideByPow(ips,pow);//第一次划分
if(difference!=0) {
while (difference>0) {
if(difference==1) {
difference--;
ipList.addAll(divideByPow(ipList.get(0),1));
ipList.remove(ipList.get(0));
}else {
pow =judge(difference);
difference=difference-calculate2Num(pow);
for (int i = 0; i < calculate2Num(pow); i++) {
ipList.addAll(divideByPow(ipList.get(0),pow));
ipList.remove(ipList.get(0));
}
}
}
}
}else {
ipList.add(ips);
}
return ipList;
}
/**
* 把long类型的Ip转为一般Ip类型：xx.xx.xx.xx
*
* @param ip
* @return
*/
public static String getIpFromLong(Long ip)
{
String s1 = String.valueOf((ip & 4278190080L) / 16777216L);
String s2 = String.valueOf((ip & 16711680L) / 65536L);
String s3 = String.valueOf((ip & 65280L) / 256L);
String s4 = String.valueOf(ip & 255L);
return s1 + "." + s2 + "." + s3 + "." + s4;
}
/**
* 把xx.xx.xx.xx类型的转为long类型的
*
* @param ip
* @return
*/
public static Long getIpFromString(String ip)
{
Long ipLong = 0L;
String ipTemp = ip;
ipLong = ipLong * 256
+ Long.parseLong(ipTemp.substring(0, ipTemp.indexOf('.')));
ipTemp = ipTemp.substring(ipTemp.indexOf('.') + 1, ipTemp.length());
ipLong = ipLong * 256
+ Long.parseLong(ipTemp.substring(0, ipTemp.indexOf('.')));
ipTemp = ipTemp.substring(ipTemp.indexOf(".") + 1, ipTemp.length());
ipLong = ipLong * 256
+ Long.parseLong(ipTemp.substring(0, ipTemp.indexOf('.')));
ipTemp = ipTemp.substring(ipTemp.indexOf('.') + 1, ipTemp.length());
ipLong = ipLong * 256 + Long.parseLong(ipTemp);
return ipLong;
}
/**
* 根据掩码位获取掩码
*
* @param maskBit
* 掩码位数，如"28"、"30"
* @return
*/
public static String getMaskByMaskBit(String maskBit)
{
return "".equals(maskBit) ? "error, maskBit is null !" : getMaskMap(maskBit);
}
/**
* 根据 ip/掩码位 计算IP段的起始IP 如 IP串 218.240.38.69/30
*
* @param ip
* 给定的IP，如218.240.38.69
* @param maskBit
* 给定的掩码位，如30
* @return 起始IP的字符串表示
*/
public static String getBeginIpStr(String ip, String maskBit)
{
return getIpFromLong(getBeginIpLong(ip, maskBit));
}
/**
* 根据 ip/掩码位 计算IP段的起始IP 如 IP串 218.240.38.69/30
*
* @param ip
* 给定的IP，如218.240.38.69
* @param maskBit
* 给定的掩码位，如30
* @return 起始IP的长整型表示
*/
public static Long getBeginIpLong(String ip, String maskBit)
{
return getIpFromString(ip) & getIpFromString(getMaskByMaskBit(maskBit));
}
/**
* 根据 ip/掩码位 计算IP段的终止IP 如 IP串 218.240.38.69/30
*
* @param ip
* 给定的IP，如218.240.38.69
* @param maskBit
* 给定的掩码位，如30
* @return 终止IP的字符串表示
*/
public static String getEndIpStr(String ip, String maskBit)
{
return getIpFromLong(getEndIpLong(ip, maskBit));
}
/**
* 根据 ip/掩码位 计算IP段的终止IP 如 IP串 218.240.38.69/30
*
* @param ip
* 给定的IP，如218.240.38.69
* @param maskBit
* 给定的掩码位，如30
* @return 终止IP的长整型表示
*/
public static Long getEndIpLong(String ip, String maskBit)
{
return getBeginIpLong(ip, maskBit)
+ ~getIpFromString(getMaskByMaskBit(maskBit));
}
public static String getMaskMap(String maskBit) {
switch (maskBit){
case "1" : return "128.0.0.0";
case "2" : return "192.0.0.0";
case "3" : return "224.0.0.0";
case "4" : return "240.0.0.0";
case "5" : return "248.0.0.0";
case "6" : return "252.0.0.0";
case "7" : return "254.0.0.0";
case "8" : return "255.0.0.0";
case "9" : return "255.128.0.0";
case "10" : return "255.192.0.0";
case "11" : return "255.224.0.0";
case "12" : return "255.240.0.0";
case "13" : return "255.248.0.0";
case "14" : return "255.252.0.0";
case "15" : return "255.254.0.0";
case "16" : return "255.255.0.0";
case "17" : return "255.255.128.0";
case "18" : return "255.255.192.0";
case "19" : return "255.255.224.0";
case "20" : return "255.255.240.0";
case "21" : return "255.255.248.0";
case "22" : return "255.255.252.0";
case "23" : return "255.255.254.0";
case "24" : return "255.255.255.0";
case "25" : return "255.255.255.128";
case "26" : return "255.255.255.192";
case "27" : return "255.255.255.224";
case "28" : return "255.255.255.240";
case "29" : return "255.255.255.248";
case "30" : return "255.255.255.252";
case "31" : return "255.255.255.254";
case "32" : return "255.255.255.255";
default: return "-1";
}
}
/**
* 十进制转换成二进制
*/
public static String makeBinaryString(int i){
String binary = "";
do{
int Bit = (i & 1);
String newDigit = ((Bit == 0) ? "0" : "1");
binary = newDigit + binary;
i >>>= 1;
}while (i != 0);
return binary;
}
/**
*
* 输入从10进制转换过来的2进制，再转换成ip地址
* @return
*/
public static String getIpStringFrom10bit(String ss)
{
while(ss.length() <32 ){
ss = "0"+ss ;
}
String[] ssArray =new String [8];
ssArray[0]=ss.substring(0, 8);
ssArray[1]=ss.substring(8, 16);
ssArray[2]=ss.substring(16, 24);
ssArray[3]=ss.substring(24, 32);
String sttttt=
Integer.valueOf(ssArray[0],2).toString()
+'.'+Integer.valueOf(ssArray[1],2).toString()
+'.'+Integer.valueOf(ssArray[2],2).toString()
+'.'+Integer.valueOf(ssArray[3],2).toString();
return sttttt;
}
/**
* 功能：根据位数返回IP总数
* 格式：isIP("192.192.192.1")
*/
public static boolean isIP(String str) {
String regex = "\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}";
Pattern pattern = Pattern.compile(regex);
return pattern.matcher(str).matches();
}
}