将IPv6转换为长到IPv6的长和长 [英] Conversion IPv6 to long and long to IPv6

问题描述

我应该如何执行从IPv6到长的转换，反之亦然？

How should I perform conversion from IPv6 to long and vice versa?

到目前为止，我有：

    public static long IPToLong(String addr) {
            String[] addrArray = addr.split("\\.");
            long num = 0;
            for (int i = 0; i < addrArray.length; i++) {
                    int power = 3 - i;

                    num += ((Integer.parseInt(addrArray[i], 16) % 256 * Math.pow(256, power)));
            }
            return num;
    }

    public static String longToIP(long ip) {
            return ((ip >> 24) & 0xFF) + "."
                    + ((ip >> 16) & 0xFF) + "."
                    + ((ip >> 8) & 0xFF) + "."
                    + (ip & 0xFF);

    }

这是正确的解决方案还是我遗漏了什么？

Is it correct solution or I missed something?

（如果解决方案适用于ipv4和ipv6，那将是完美的）

(It would be perfect if the solution worked for both ipv4 and ipv6)

推荐答案

IPv6地址是128位数字，如此处所述。 Java中的长整数以64位表示，因此您需要另一个结构，如BigDecimal或两个long（一个具有两个long的数组的容器或者只是两个long的数组），以便存储IPv6地址。

An IPv6 address is a 128-bit number as described here. A long in Java is represented on 64 bits, so you need another structure, like a BigDecimal or two longs (a container with an array of two longs or simply an array of two longs) in order to store an IPv6 address.

下面是一个例子（仅为您提供一个想法）：

Below is an example (just to provide you an idea):

public class Asd {

public static long[] IPToLong(String addr) {
    String[] addrArray = addr.split(":");//a IPv6 adress is of form 2607:f0d0:1002:0051:0000:0000:0000:0004
    long[] num = new long[addrArray.length];

    for (int i=0; i<addrArray.length; i++) {
        num[i] = Long.parseLong(addrArray[i], 16);
    }
    long long1 = num[0];
    for (int i=1;i<4;i++) {
        long1 = (long1<<16) + num[i];
    }
    long long2 = num[4];
    for (int i=5;i<8;i++) {
        long2 = (long2<<16) + num[i];
    }

    long[] longs = {long2, long1};
    return longs;
}


public static String longToIP(long[] ip) {
    String ipString = "";
    for (long crtLong : ip) {//for every long: it should be two of them

        for (int i=0; i<4; i++) {//we display in total 4 parts for every long
            ipString = Long.toHexString(crtLong & 0xFFFF) + ":" + ipString;
            crtLong = crtLong >> 16;
        }
    }
    return ipString;

}

static public void main(String[] args) {
    String ipString = "2607:f0d0:1002:0051:0000:0000:0000:0004";
    long[] asd = IPToLong(ipString);

    System.out.println(longToIP(asd));
}

}

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