JAVA实现IP排序

1  需求概述

        实现对ipv4或者ipv6的排序。由于ipv4和ipv6无法比较大小，所以需要单独对ipv4和ipv6进行排序，然后分别存储在已经排好序的集合中。

2  实现

import java.math.BigInteger;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Scanner;
import java.util.SortedSet;
import java.util.TreeSet;

public class IPUtil {
    private static Long ipv4ToNumeric(String ip) {
    	Scanner sc = new Scanner(ip).useDelimiter("\\.");
    	Long restValue = (sc.nextLong() << 24) + (sc.nextLong() << 16) + (sc.nextLong() << 8) + (sc.nextLong());
    	sc.close();
    	return restValue;
    }
    
    private static BigInteger ipv6ToNumeric(String ip) {
    	BigInteger ipNum = null;
    	try {
			ipNum = new BigInteger(1, InetAddress.getByName(ip).getAddress());
		} catch (UnknownHostException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}  	
    	return ipNum;
    }
    
    public static Map<String, SortedSet<String>> ipSort(List<String> ips) {
    	List<String> ipv4 = new ArrayList<>();
    	List<String> ipv6 = new ArrayList<>();
    	List<String> uncertain = new ArrayList<>();
    	Map<String, SortedSet<String>> restMap = new HashMap<>(3);
    	
    	for (String ip : ips) {
    		if (ip.contains(":")) {
    			ipv6.add(ip);
    		} else if (ip.contains(".")) {
    			ipv4.add(ip);
    		} else {
    			System.out.println("不属于ipv4或者ipv6： " + ip);
    			uncertain.add(ip);
    		}
    	}
    	
    	// ipv4排序
    	Comparator<String> ipv4Comparator = Comparator.comparing(IPUtil::ipv4ToNumeric);
    	SortedSet<String> rest_ipv4 = new TreeSet<>(ipv4Comparator);
    	rest_ipv4.addAll(ipv4);
    	System.out.println(rest_ipv4);
    	restMap.put("ipv4", rest_ipv4);
    	
    	// ipv6排序
    	Comparator<String> ipv6Comparator = Comparator.comparing(IPUtil::ipv6ToNumeric);
    	SortedSet<String> rest_ipv6 = new TreeSet<>(ipv6Comparator);
    	rest_ipv6.addAll(ipv6);
    	System.out.println(rest_ipv6);
    	restMap.put("ipv4", rest_ipv6);
    	
    	// 返回排序结果
    	return restMap;
    }
}

import java.util.Arrays;
import java.util.List;

public class HelloWorld {
    public static void main(String[] args) {
    	List<String> ips = Arrays.asList("192.168.0.1", "192.168.0.2", "192.168.0.9", "9.9.9.9", 
    			"127.0.0.1", "192.168.0.90", "192.168.0.89", "192.168.0.8", "192.168.0.9", "192.163.0.9", 
    			"::874C:2B35", "::874B:2B35", "::874B:2B34", "::874C:2B36");
    	IPUtil.ipSort(ips);
    }
}

        解释：先对列表中的所有ip进行分类，按照ipv4和ipv6进行分类，分别存入对应的列表中，然后分别对ipv4和ipv6进行排序，最后存到hashmap中返回。