TLDR
您可以直接跳转到一种有效的比较方法（参见下面的编辑部分）或
继续阅读。
为了对 IP 进行排序，您首先需要对它们有所了解。有两种类型的 IP； 32 Bit 和 128 Bit。
32 位 Source
-
32 bit IP 被分成0 和255 之间的4 组数字。这些组通过. 分隔
- 如上所示，单个组是 8 位数据。这就是组中的数字被限制在
0 和255 之间的原因。
- 要正确格式化
32 bit IP，它应该是int.int.int.int。即使 int 是 0，它也必须显示在 IP 地址中。这与128 bit IP 不同，后者可能会省略0s。例如::5: 与0:0:5:0:0:0:0:0 相同。
128 位 Source
-
128 bit IP 被分成0 和FFFF 之间的8 组数字（相当于65535）。与32 bit IPs 组不同，这些组是分开购买的:。
- 如上所示，单个组是 16 位数据。这就是组中的人数限制在
0 和FFFF 之间的原因。
- 要正确格式化
128 bit IP，您必须遵循几条规则。 0s 可以从组中省略，如果剩余的组都是0，那么这些组也可以省略。这些组必须用: 分隔。如果您要省略组，则不是0 的最后一组必须后跟:。这些规则给我们留下了int:int:int:int:int:int:int:int 的格式。 0s 和被省略的组的示例是 58f:::fff:2:。这与58f:0:0:fff:2:0:0:0 相同。
排序
一旦将 IP 分类到各自的组中，就可以对其进行分类。要对 IP 进行排序，您需要使用一种称为加权的方法。这是因为简单地将不同的组相加或相乘是行不通的。以这两个IP为例； 192.5.48.198 和 198.48.5.192。如果将组的值相加或相乘，您将得到相同的答案。所以没有办法使用加法和乘法来准确地比较它们。如果你使用权重，你会得到类似的结果。
32 位加权
Value of IP = (Group one value * 256^4) + (Group two value * 256^3) +
(Group three value * 256^2) + (Group four value * 256)
128 位加权
Value of IP = (Group one value * 65536^8) + (Group two value * 65536^7) +
(Group three value * 65536^6) + (Group four value * 65536^5) +
(Group five value * 65536^4) + (Group six value * 65536^3) +
(Group seven value * 65536^2) + (Group eight value * 65536)
Java 代码
只要 IP 的格式合理正确，这段代码就会将两种 IP 分开，然后对它们进行排序。
import java.util.*;
import java.math.*; //For BigInteger
import java.util.regex.*;
import java.lang.*;
public class IPSort
{
String[] tests = {":8:","::::5:6::8","::::5:6::7","::::5:6::8","123..245.23","1...","..1.","123...23",".1..","123..245.23", "123..245.23", "104.244.253.29", "1.198.3.93", "32.183.93.40", "32.183.93.40", "104.30.244.2", "104.244.4.1","0.0.0.1",":a:","::5:3:4:5:6:78","1::2:3","1::2:3:4","1::5:256.2.3.4","1:1:3000.30.30.30","ae80::217:f2ff:254:7:237:98"};
ArrayList<String> bit32 = new ArrayList<String>();
ArrayList<String> bit128 = new ArrayList<String>();
ArrayList<String> cleanBit32 = new ArrayList<String>();
ArrayList<String> cleanBit128 = new ArrayList<String>();
boolean myMatcher32Bit(String s)
{
Pattern patter32Bit = Pattern.compile("^(?=(?:[^.]*\\.){3}[^.]*$)(?=(?:[^:]*:){0}[^:]*$)(?=(?:[^a-zA-Z]*[^a-zA-Z])*$)");
Matcher matcher32Bit = patter32Bit.matcher(s);
return matcher32Bit.find();
}
boolean myMatcher128Bit(String s)
{
Pattern patter128Bit = Pattern.compile("^(?=(?:[^.]*\\.){0}[^.]*$)(?=(?:[^:]*:){1,7}[^:]*$)");
Matcher matcher128Bit = patter128Bit.matcher(s);
return matcher128Bit.find();
}
public void sortIntoRespectiveIPTypes()
{
for(String s: tests)
{
if(myMatcher32Bit(s))
{
bit32.add(s);
}
else if(myMatcher128Bit(s))
{
bit128.add(s);
}
}
System.out.println("32 bit IPs");
for(String ip: bit32)
{
System.out.println(" "+ip);
}
System.out.println("\n128 bit IPs");
for(String ip: bit128)
{
System.out.println(" "+ip);
}
int count = 0;
for(String ip: tests)
{
if(myMatcher32Bit(ip)==false && myMatcher128Bit(ip)==false)
{
count++;
}
}
if(count != 0)
{
System.out.println("\nDidn't match an IP format");
for(String ip: tests)
{
if(myMatcher32Bit(ip)==false && myMatcher128Bit(ip)==false)
{
System.out.println(" "+ip);
}
}
}
}
public void sort32BitIPs(ArrayList<String> bit32, ArrayList<String> newBit32)
{
ArrayList<BigInteger> bigInt32Bit = new ArrayList<BigInteger>();
for(String ip:bit32)
{
String[] tempArray = ip.split("\\.");
int i=0;
for(String s:tempArray)
{
if(s.equals(""))
{
tempArray[i]="0";
}
i++;
}
bigInt32Bit.add(convert32Bit(tempArray));
}
Collections.sort(bigInt32Bit);
ArrayList<String> fixFormat = new ArrayList<String>();
for(String ip:bit32)
{
String[] fixArray = ip.split("\\.");
int i=0;
for(String s:fixArray)
{
if(s.equals(""))
{
fixArray[i]="0";
}
i++;
}
StringBuilder strBuilder = new StringBuilder();
for(int i2 = 0; i2 < 4; i2++)
{
if(i2<3)
{
try
{
if(!fixArray[i2].equals(""))
{
strBuilder.append(fixArray[i2]+".");
}
else
{
strBuilder.append(".");
}
}
catch(Exception e)
{
strBuilder.append("0.");
}
}
else
{
try
{
strBuilder.append(fixArray[i2]);
}
catch(Exception e)
{
strBuilder.append("0");
}
}
}
String newString = strBuilder.toString();
fixFormat.add(newString);
bit32=fixFormat;
}
for(BigInteger finalValue:bigInt32Bit)
{
for(String ip:bit32)
{
String[] tempArray = ip.split("\\.");
int i=0;
for(String s:tempArray)
{
if(s.equals(""))
{
tempArray[i]="0";
}
i++;
}
if(finalValue.equals(convert32Bit(tempArray)))
{
if(!newBit32.contains(ip))
{
String str = bit32.toString();
String findStr = ip;
int lastIndex = 0;
int count = 0;
while(lastIndex != -1){
lastIndex = str.indexOf(findStr,lastIndex);
if(lastIndex != -1){
count++;
lastIndex += findStr.length();
}
}
for(int k = 0; k<count;k++)
{
newBit32.add(ip);
}
}
}
}
}
}
BigInteger convert32Bit(String[] array)
{
int[] tempArray = new int[array.length];
ArrayList<BigInteger> tempBigIntList = new ArrayList<BigInteger>();
int i = 0;
for(String s:array)
{
int power = 4-i;
tempArray[i]= Integer.parseInt(s);
String string = Integer.toString(tempArray[i]);
BigInteger myBigInt = new BigInteger(string);
BigInteger num2 = myBigInt.multiply(new BigInteger("256").pow(power));
tempBigIntList.add(num2);
i++;
}
BigInteger bigInt32Bit = new BigInteger("0");
for(BigInteger bI:tempBigIntList)
{
bigInt32Bit = bigInt32Bit.add(bI);
}
return bigInt32Bit;
}
public void sort128BitIPs(ArrayList<String> bit128,ArrayList<String> newBit128)
{
ArrayList<BigInteger> bigInt128Bit = new ArrayList<BigInteger>();
for(String ip:bit128)
{
String[] tempArray = ip.split(":");
int i=0;
for(String s:tempArray)
{
if(s.equals(""))
{
tempArray[i]="0";
}
i++;
}
bigInt128Bit.add(convert128Bit(tempArray));
}
Collections.sort(bigInt128Bit);
for(BigInteger finalValue:bigInt128Bit)
{
for(String ip:bit128)
{
String[] tempArray = ip.split(":");
int i=0;
for(String s:tempArray)
{
if(s.equals(""))
{
tempArray[i]="0";
}
i++;
}
if(finalValue.equals(convert128Bit(tempArray)))
{
if(!newBit128.contains(ip))
{
String str = bit128.toString();
String findStr = ip;
int lastIndex = 0;
int count = 0;
while(lastIndex != -1){
lastIndex = str.indexOf(findStr,lastIndex);
if(lastIndex != -1){
count++;
lastIndex += findStr.length();
}
}
for(int k = 0; k<count;k++)
{
newBit128.add(ip);
}
}
}
}
}
}
BigInteger convert128Bit(String[] array)
{
int[] tempArray = new int[array.length];
ArrayList<BigInteger> tempBigIntList = new ArrayList<BigInteger>();
int i = 0;
for(String s:array)
{
int power = 8-i;
tempArray[i]= Integer.parseInt(s,16);
String string = Integer.toString(tempArray[i]);
BigInteger myBigInt = new BigInteger(string);
BigInteger num2 = myBigInt.multiply(new BigInteger("65536").pow(power));
tempBigIntList.add(num2);
i++;
}
BigInteger bigInt128Bit = new BigInteger("0");
for(BigInteger bI:tempBigIntList)
{
bigInt128Bit = bigInt128Bit.add(bI);
}
return bigInt128Bit;
}
public void printInOrder(ArrayList<String> bit32,ArrayList<String> bit128)
{
System.out.println("\nSorted IPs");
System.out.println("Sorted 32 bit IPs - Ascending");
for(String ip: bit32)
{
System.out.println(" "+ip);
}
Collections.reverse(bit32);
System.out.println("\nSorted 32 bit IPs - Descending");
for(String ip: bit32)
{
System.out.println(" "+ip);
}
System.out.println("\nSorted 128 bit IPs - Ascending");
for(String ip: bit128)
{
System.out.println(" "+ip);
}
Collections.reverse(bit128);
System.out.println("\nSorted 128 bit IPs - Descending");
for(String ip: bit128)
{
System.out.println(" "+ip);
}
}
public void run(ArrayList<String> bit32,ArrayList<String> bit128,ArrayList<String> newBit32,ArrayList<String> newBit128)
{
sortIntoRespectiveIPTypes();
sort32BitIPs(bit32,newBit32);
sort128BitIPs(bit128,newBit128);
printInOrder(newBit32,newBit128);
}
public static void main(String[] args)
{
IPSort ipS = new IPSort();
ipS.run(ipS.bit32,ipS.bit128,ipS.cleanBit32,ipS.cleanBit128);
}
}
请注意，可以使用this class 对 IP 进行排序，但我的代码没有使用它
此代码还将列表按升序排序，然后按降序排序。这在代码运行时会在命令控制台中打印出来
输出
编辑
使用上面提到的InetAddress class 是一种更有效、更准确的方法。感谢 200_success 获取代码。
import java.net.InetAddress;
import java.net.Inet4Address;
import java.net.Inet6Address;
import java.net.UnknownHostException;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.Optional;
import java.util.stream.Stream;
public class IPSort {
private static String[] TESTS = {"0:0:0:0:0:0:fff:ffff","::FFFF:222.1.41.90",":8:","::::5:6::8","::::5:6::7","::::5:6::8","123..245.23","1...","..1.","123...23",".1..","123..245.23", "123..245.23", "104.244.253.29", "1.198.3.93", "32.183.93.40", "32.183.93.40", "104.30.244.2", "104.244.4.1","0.0.0.1",":a:","::5:3:4:5:6:78","1::2:3","1::2:3:4","1::5:256.2.3.4","1:1:3000.30.30.30","ae80::217:f2ff:254:7:237:98","::2:3:4:5:6:7","2:3:4:5:6:7","::5:3:4:5:6:7:8","::5:3:4:5:6:7:8:9:0","1::8","1::2:3","1::2:3:4","1::5:256.2.3.4","1:1:3000.30.30.30","ae80::217:f2ff:254.7.237.98","1:2:3:4::5:1.2.3.4","2001:0000:1234:0000:0000:C1C0:ABCD:0876","12345::6:7:8","1::1.2.900.4","fe80::","::ffff:0:0"};
public static class InetAddressComparator implements Comparator<InetAddress> {
@Override
public int compare(InetAddress a, InetAddress b) {
byte[] aOctets = a.getAddress(),
bOctets = b.getAddress();
int len = Math.max(aOctets.length, bOctets.length);
for (int i = 0; i < len; i++) {
byte aOctet = (i >= len - aOctets.length) ?
aOctets[i - (len - aOctets.length)] : 0;
byte bOctet = (i >= len - bOctets.length) ?
bOctets[i - (len - bOctets.length)] : 0;
if (aOctet != bOctet) return (0xff & aOctet) - (0xff & bOctet);
}
return 0;
}
}
public static Optional<InetAddress> toInetAddress(String s) {
try {
return Optional.of(InetAddress.getByName(s));
} catch (UnknownHostException badAddress) {
return Optional.empty();
}
}
public static void main(String[] args) throws Exception {
System.out.println("Valid 32-bit addresses");
Arrays.stream(TESTS)
.map(IPSort::toInetAddress)
.filter(Optional::isPresent)
.map(Optional::get)
.filter((addr) -> addr instanceof Inet4Address)
.map(InetAddress::getHostAddress)
.forEach(System.out::println);
System.out.println("\nValid 128-bit addresses");
Arrays.stream(TESTS)
.map(IPSort::toInetAddress)
.filter(Optional::isPresent)
.map(Optional::get)
.filter((addr) -> addr instanceof Inet6Address)
.map(InetAddress::getHostAddress)
.forEach(System.out::println);
System.out.println("\nInvalid addresses");
Arrays.stream(TESTS)
.filter((s) -> !toInetAddress(s).isPresent())
.forEach(System.out::println);
System.out.println("\nSorted addresses");
Arrays.stream(TESTS)
.map(IPSort::toInetAddress)
.filter(Optional::isPresent)
.map(Optional::get)
.sorted(new InetAddressComparator())
.map(InetAddress::getHostAddress)
.forEach(System.out::println);
}
}