如何將IPv6地址轉換爲Scala中的BigInteger以及如何轉換BigInteger中的IPv6地址

Question

尋求將IPv6字符串（例如2001：0：4137：9e76：34b7：2e31：3f57：fd9a）轉換爲BigInteger以及從BigInteger轉換爲IPv6字符串。

Answer 1

import java.math.BigInteger 
import java.net.InetAddress 
import java.net.Inet6Address 
def ipv6ToBigInteger(ipv6 : String) : BigInteger = { 
    val ia = InetAddress.getByName(ipv6) 
    val byteArr : Array[Byte] = ia.getAddress() 
    var ipNumber = new BigInteger("0") 
    if (ia.isInstanceOf[Inet6Address]) { 
     ipNumber = new BigInteger(1, byteArr) 
    } 
    return ipNumber 
} 

def bigIntegerToIPv6(ipv6Num : BigInteger) : String = { 
    val ipv6Str = InetAddress.getByAddress(ipv6Num.toByteArray).toString() 
    return ipv6Str.replaceFirst("/", "") 
} 

val ipv6 = "2001:0:4137:9e76:34b7:2e31:3f57:fd9a" 
val ipv6Num = ipv6ToBigInteger(ipv6) // ipv6Num: java.math.BigInteger = 42540488182159607633435240198452018586 
val ipv6Str = bigIntegerToIPv6(ipv6Num) // ipv6Str: String = 2001:0:4137:9e76:34b7:2e31:3f57:fd9a 
ipv6 == ipv6Str // res0: Boolean = true 

UPDATE編輯：

每一個建議編輯來自匿名用戶：

「的評論：InetAddress.getByAddress需要一個16字節的數組，以解析的IPv6地址（4字節。數組的IPv4），因爲它是，代碼失敗未造成一個16字節數組的任意值時.toByteArray被稱爲它」

def bigIntToFixedSizeByteArray(n: BigInteger, size: Int = 16): Array[Byte] = { 
    val a = n.toByteArray 
    val leadingLength = math.max(size - a.length, 0) 
    Array.ofDim[Byte](leadingLength) ++ a 
} 

def bigIntegerToIPv6(ipv6Num : BigInteger) : String = { 
    val address = InetAddress.getByAddress(bigIntToFixedSizeByteArray(ipv6Num)) 
    address.toString.replaceFirst("/", "") 
} 

Answer 2

看看這個（支持IPv4和IPv6）：

import java.math.BigInteger 
import java.net.{UnknownHostException, InetAddress} 
import org.apache.commons.lang.StringUtils 

def ipToBigInteger(s: String): BigInteger = { 
    try { 
    val i = InetAddress.getByName(s) 
    val a: Array[Byte] = i.getAddress() 
    new BigInteger(1, a) 
    } catch { 
    case e: UnknownHostException => new BigInteger("-1") 
    } 
} 


def bigIntegerToIP(s: String): String = { 
    try { 
    //InetAddress.getByAddress(bi.toByteArray).toString.replaceFirst("/", "") 
    val bi = new BigInteger(s) 
    if (bi.compareTo(new BigInteger("0")) != -1 && bi.compareTo(new BigInteger("340282366920938463463374607431768211455")) != 1) { 
     if (bi.compareTo(new BigInteger("4294967295")) != 1) { // IPV4 
     val l = bi.longValue 
     String.format("%d.%d.%d.%d", 
      bi.shiftRight(24).and(BigInteger.valueOf(0xFF)).intValue: Integer, 
      bi.shiftRight(16).and(BigInteger.valueOf(0xFF)).intValue: Integer, 
      bi.shiftRight(8).and(BigInteger.valueOf(0xFF)).intValue: Integer, 
      bi.and(BigInteger.valueOf(0xFF)).intValue: Integer) 
     } else { // IPV6 
     String.format("%s:%s:%s:%s:%s:%s:%s:%s", 
      Integer.toHexString(bi.shiftRight(112).and(BigInteger.valueOf(0xFFFF)).intValue): java.lang.String, 
      Integer.toHexString(bi.shiftRight(96).and(BigInteger.valueOf(0xFFFF)).intValue): java.lang.String, 
      Integer.toHexString(bi.shiftRight(80).and(BigInteger.valueOf(0xFFFF)).intValue): java.lang.String, 
      Integer.toHexString(bi.shiftRight(64).and(BigInteger.valueOf(0xFFFF)).intValue): java.lang.String, 
      Integer.toHexString(bi.shiftRight(48).and(BigInteger.valueOf(0xFFFF)).intValue): java.lang.String, 
      Integer.toHexString(bi.shiftRight(32).and(BigInteger.valueOf(0xFFFF)).intValue): java.lang.String, 
      Integer.toHexString(bi.shiftRight(16).and(BigInteger.valueOf(0xFFFF)).intValue): java.lang.String, 
      Integer.toHexString(bi.and(BigInteger.valueOf(0xFFFF)).intValue): java.lang.String) 
     } 
    } else 
     StringUtils.EMPTY 
    } catch { 
    case e: UnknownHostException => StringUtils.EMPTY 
    case e: NumberFormatException => StringUtils.EMPTY 
    } 
} 


def bigIntegerToIPV6(bi: BigInteger): String = { 
    try { 
    //InetAddress.getByAddress(bi.toByteArray).toString.replaceFirst("/", "") 
    if (bi.compareTo(new BigInteger("0")) != -1 && bi.compareTo(new BigInteger("340282366920938463463374607431768211455")) != 1) { 
     String.format("%s:%s:%s:%s:%s:%s:%s:%s", 
     Integer.toHexString(bi.shiftRight(112).and(BigInteger.valueOf(0xFFFF)).intValue): java.lang.String, 
     Integer.toHexString(bi.shiftRight(96).and(BigInteger.valueOf(0xFFFF)).intValue): java.lang.String, 
     Integer.toHexString(bi.shiftRight(80).and(BigInteger.valueOf(0xFFFF)).intValue): java.lang.String, 
     Integer.toHexString(bi.shiftRight(64).and(BigInteger.valueOf(0xFFFF)).intValue): java.lang.String, 
     Integer.toHexString(bi.shiftRight(48).and(BigInteger.valueOf(0xFFFF)).intValue): java.lang.String, 
     Integer.toHexString(bi.shiftRight(32).and(BigInteger.valueOf(0xFFFF)).intValue): java.lang.String, 
     Integer.toHexString(bi.shiftRight(16).and(BigInteger.valueOf(0xFFFF)).intValue): java.lang.String, 
     Integer.toHexString(bi.and(BigInteger.valueOf(0xFFFF)).intValue): java.lang.String) 
    } else 
     StringUtils.EMPTY 
    } catch { 
    case e: UnknownHostException => StringUtils.EMPTY 
    case e: NumberFormatException => StringUtils.EMPTY 
    } 
}