用于将长IPv6地址转换为压缩形式的Java库 [英] Java Library for converting a long IPv6 address into its compressed form

问题描述

我想知道，是否有一个库我可以用来将长IPv6地址的代表（例如2002：9876：57AB：0000：0000：0000：0000：0001）转换为压缩的IPv6 form（在这种情况下：2002：9876：57AB :: 1）。

I would like to know, whether there is a library which I can use to convert a represenation of a long IPv6 address (such as 2002:9876:57AB:0000:0000:0000:0000:0001) into the compressed IPv6 form (in this case: 2002:9876:57AB::1).

我无法找到这样的库。此库不应使用任何IP Api，不得进行网络连接。

I was not able to find such a library. This library should not use any IP Api, a network connection must not be made.

我已经尝试过

return Inet6Address.getByName(longAdress).toString();

但这只是将4个零替换为1（在本例中为2002：9876：57AB：0 ：0：0：0：1）。

but this just replaces the 4 zeros with 1 zero (in this case 2002:9876:57AB:0:0:0:0:1).

任何建议？

推荐答案

public class Ipv6AddressCompressor {
    public static String getCompressedAddress(String longAddress) throws UnknownHostException {
        longAddress = Inet6Address.getByName(longAddress).getHostAddress();
        return longAddress.replaceFirst("(^|:)(0+(:|$)){2,8}", "::");
    }
}

这可以保护您免受无效地址的攻击（抛出UnknownHostException） ），并将正确压缩尾随的ipv4地址（即0：0：0：0：0：0：255.255.255.255 - > :: FFFF：FFFF）。这也可以防止已压缩的地址。

This should protect you against invalid addresses (throws the UnknownHostException), and will properly compress trailing ipv4 addresses (i.e. 0:0:0:0:0:0:255.255.255.255 -> ::FFFF:FFFF). This will also protect against already compressed addresses.

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