IPV4与IPV6工具

package com.citydo.xclouddesk.utils;

import org.apache.commons.lang3.text.StrTokenizer;

import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.util.Enumeration;
import java.util.regex.Pattern;

public class IpUtils {

    public static final String _255 = "(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)";

    public static final Pattern pattern = Pattern.compile("^(?:" + _255 + "\\.){3}" + _255 + "$");


    public static String longToIpV4(long longIp) {
        int octet3 = (int) ((longIp >> 24) % 256);
        int octet2 = (int) ((longIp >> 16) % 256);
        int octet1 = (int) ((longIp >> 8) % 256);
        int octet0 = (int) ((longIp) % 256);
        return octet3 + "." + octet2 + "." + octet1 + "." + octet0;
    }

    public static long ipV4ToLong(String ip) {
        String[] octets = ip.split("\\.");
        return (Long.parseLong(octets[0]) << 24) + (Integer.parseInt(octets[1]) << 16)
                + (Integer.parseInt(octets[2]) << 8) + Integer.parseInt(octets[3]);
    }

    public static boolean isIPv4Private(String ip) {
        long longIp = ipV4ToLong(ip);
        return (longIp >= ipV4ToLong("10.0.0.0") && longIp <= ipV4ToLong("10.255.255.255"))
                || (longIp >= ipV4ToLong("172.16.0.0") && longIp <= ipV4ToLong("172.31.255.255"))
                || longIp >= ipV4ToLong("192.168.0.0") && longIp <= ipV4ToLong("192.168.255.255");
    }

    public static boolean isIPv4Valid(String ip) {
        return pattern.matcher(ip).matches();
    }

    /**
     * 获取IPV4地址
     * @param request
     * @return
     */
    public static String getIpFromRequest(HttpServletRequest request) {
        String ip;
        boolean found = false;
        if ((ip = request.getHeader("x-forwarded-for")) != null) {
            StrTokenizer tokenizer = new StrTokenizer(ip, ",");
            while (tokenizer.hasNext()) {
                ip = tokenizer.nextToken().trim();
                if (isIPv4Valid(ip) && !isIPv4Private(ip)) {
                    found = true;
                    break;
                }
            }
        }
        if (!found) {
            ip = request.getRemoteAddr();
        }
        return ip;
    }

    /**
     * 获取IPV6地址
     * @return
     * @throws IOException
     */
    public static String getLocalIPv6Address() throws IOException {
        InetAddress inetAddress = null;
        Enumeration<NetworkInterface> networkInterfaces =
                NetworkInterface
                        .getNetworkInterfaces();
        outer:
        while (networkInterfaces.hasMoreElements()) {
            Enumeration<InetAddress> inetAds =
                    networkInterfaces.nextElement()
                            .getInetAddresses();
            while (inetAds.hasMoreElements()) {
                inetAddress = inetAds.nextElement();
                //Check if it's ipv6 address and reserved address
                if (inetAddress instanceof Inet6Address
                        && !isReservedAddr(inetAddress)) {
                    break outer;
                }
            }
        }
        String ipAddr = inetAddress.getHostAddress();
        // Filter network card No
        int index = ipAddr.indexOf('%');
        if (index > 0) {
            ipAddr = ipAddr.substring(0, index);
        }
        return ipAddr;
    }


    private static boolean isReservedAddr(InetAddress inetAddr) {
        if (inetAddr.isAnyLocalAddress() || inetAddr.isLinkLocalAddress()
                || inetAddr.isLoopbackAddress()) {
            return true;
        }
        return false;
    }


    /**
     * 获取客户端的IP
     * @param request
     * @return
     */
    public static String getIpAddress(HttpServletRequest request) {
        String ip = request.getHeader("x-forwarded-for");
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_CLIENT_IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_X_FORWARDED_FOR");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        return ip;
    }

}