IP工具库：ip v4地址字符串转长整型ip2long、长整形转ip v4地址字符串long2IP；ip v6地址字符串与大整数互转

package com.example.webapp2.utils;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.http.HttpServletRequest;
import java.math.BigInteger;
import java.net.Inet4Address;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.UnknownHostException;

/**
 * Created by yeqiang on 3/26/19.
 */
public class InetUtils {
    private static final Logger logger = LoggerFactory.getLogger(InetUtils.class);

    private static final String[] HEADERS_TO_TRY = {
            "X-Forwarded-For",
            "Proxy-Client-IP",
            "WL-Proxy-Client-IP",
            "HTTP_X_FORWARDED_FOR",
            "HTTP_X_FORWARDED",
            "HTTP_X_CLUSTER_CLIENT_IP",
            "HTTP_CLIENT_IP",
            "HTTP_FORWARDED_FOR",
            "HTTP_FORWARDED",
            "HTTP_VIA",
            "REMOTE_ADDR"};

    /**
     * 从请求头中读取真实代理服务器前客户端ip地址
     *
     * @param request
     * @return
     */
    public static String getProxyRealIp(HttpServletRequest request) {
        String ip = null;
        for (String key : HEADERS_TO_TRY) {
            ip = request.getHeader(key);
            if (ip != null) {
                return ip;
            }
        }
        return ip;
    }


    /**
     * ipv4地址转长整形
     *
     * @param ip
     * @return
     */
    public static Long ip2long(String ip) {
        try {
            InetAddress address = InetAddress.getByName(ip);
            if (address instanceof Inet4Address) {
                long l = 0l;
                for (int i = 0; i < 4; i++) {
                    byte b = address.getAddress()[i];
                    long l1 = (long) b & 0xFF;
                    l += l1 << ((3 - i) * 8);
                }
                return l;
            }
        } catch (UnknownHostException e) {
            logger.error(e.getMessage(), e);
        }
        return null;
    }

    /**
     * 将一个长整数转换成ipv4字符串
     *
     * @param lng
     * @return
     */
    public static String long2IP(Long lng) {
        byte[] array = new byte[4];
        for (int i = 0; i < 4; i++) {
            array[i] = (byte) ((lng >> ((3 - i) * 8)) & 0xFF);
        }
        try {
            String ipv4 = InetAddress.getByAddress(array).toString().substring(1);
            return ipv4;
        } catch (UnknownHostException e) {
            logger.error(e.getMessage(), e);
        }
        return null;
    }

    /**
     * 将ipv6地址字符串转为大整数
     *
     * @param ip
     * @return
     */
    public static BigInteger ipv6ToBitInteger(String ip) {
        try {
            InetAddress address = InetAddress.getByName(ip);
            if (address instanceof Inet6Address) {
                return new BigInteger(1, address.getAddress());
            }
        } catch (UnknownHostException e) {
            logger.error(e.getMessage(), e);
        }
        return null;
    }

    /**
     * 将大整数转换成ipv6字符串
     *
     * @param bigInteger
     * @return
     */
    public static String bigIntegerToIPv6(BigInteger bigInteger) {
        try {
            String ipv6 = InetAddress.getByAddress(bigInteger.toByteArray()).toString().substring(1);
            return ipv6;
        } catch (UnknownHostException e) {
            logger.error(e.getMessage(), e);
        }
        return null;
    }


}

单元测试

package com.example.webapp2.utils;

import org.junit.Test;

import java.math.BigInteger;
import java.net.UnknownHostException;

/**
 * Created by yeqiang on 5/22/19.
 */
public class InetUtilsTest {
    @Test
    public void ip2long() throws Exception {
        String ip = "192.168.0.1";
        Long lng = InetUtils.ip2long(ip);
        System.out.println(lng);
        ip = InetUtils.long2IP(lng);
        System.out.println(ip);
    }

    @Test
    public void ipv6ToBigInteger() throws UnknownHostException {
        String ipv6Address = "2001:0DB8:0000:0023:0008:0800:200C:417A";
        BigInteger bigInteger = InetUtils.ipv6ToBitInteger(ipv6Address);
        System.out.println(bigInteger);
        System.out.println(InetUtils.bigIntegerToIPv6(bigInteger));
    }

}

单元测试执行结果

42540766411282593502542288127932514682
2001:db8:0:23:8:800:200c:417a
3232235521
192.168.0.1