java实现ipv4和ipv6字符串地址与数字类型的转换

本是古典何须时尚 2023-07-13 12:24 32阅读 0赞

项目中需要将IPv4或IPv6地址转换成数字类型，或者将数字类型的ip地址转换成字符串的IPv4或IPv6地址。所以需要一个工具类，这篇文章记录一下自己使用的工具类。

**IpUtil.java**

import java.math.BigInteger;
    
    public class IpUtil { 
    
        /**ipv4字符串转为long * */
        public static long ipToLong(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;
            l = l + (Long.valueOf(splits[3], 10));
            return l;
        }
    
        /**long转为ipv4字符串 * */
        public static String longToIp(long l){ 
            String ip = "";
            ip = ip + (l >>> 24);
            ip = ip + "." +((0x00ffffff & l) >>> 16);
            ip = ip + "." +((0x0000ffff & l) >>> 8);
            ip = ip + "." +(0x000000ff & l);
            return ip;
        }
    
        /**ipv6字符串转BigInteger数 * */
        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++;
                    }
                }
                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;
        }
    
        /**BigInteger数 转为ipv6字符串 * */
        public static String intToIpv6(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);
            }
            //去掉最后的：号
            str = str.substring(0, str.length() - 1);
            return str.replaceFirst("(^|:)(0+(:|$)){2,8}", "::");
        } 
    
        /**将精简的ipv6地址扩展为全长度的ipv6地址 * */
        public static String completeIpv6(String strIpv6){ 
            BigInteger big = ipv6ToInt(strIpv6);
            String str = big.toString(16);
            String completeIpv6Str = "";
            while(str.length() != 32){ 
                str = "0" + str;
            }
            for (int i = 0; i <= str.length(); i += 4){ 
                completeIpv6Str += str.substring(i, i + 4);
                if ((i + 4) == str.length()){ 
                    break;
                }
                completeIpv6Str += ":";
            }
            return completeIpv6Str;
        } 
    }