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			package com.dy.common.util;

			import jakarta.servlet.http.HttpServletRequest;

			import java.net.InetAddress;
			import java.net.NetworkInterface;
			import java.net.UnknownHostException;
			import java.util.Enumeration;
			import java.util.regex.Matcher;
			import java.util.regex.Pattern;

			/**
			* 获取IP方法
			*
			* @author liurunyu
			*/
			public class IPUtils {

			/**
			* 检查IP是否合法
			*
			* @param ip
			* @return
			*/
			public static boolean ipValid(String ip) {
			String regex0 = "(2[0-4]\\d)" + "\|(25[0-5])";
			String regex1 = "1\\d{2}";
			String regex2 = "[1-9]\\d";
			String regex3 = "\\d";
			String regex = "(" + regex0 + ")\|(" + regex1 + ")\|(" + regex2 + ")\|(" + regex3 + ")";
			regex = "(" + regex + ").(" + regex + ").(" + regex + ").(" + regex + ")";
			Pattern p = Pattern.compile(regex);
			Matcher m = p.matcher(ip);
			return m.matches();
			}

			/**
			* 获取本地ip 适合windows与linux
			*
			* @return
			*/
			public static String getLocalIP() {
			String localIP = "127.0.0.1";
			try {
			Enumeration netInterfaces = NetworkInterface.getNetworkInterfaces();
			while (netInterfaces.hasMoreElements()) {
			NetworkInterface ni = (NetworkInterface) netInterfaces.nextElement();
			InetAddress ip = ni.getInetAddresses().nextElement();
			if (!ip.isLoopbackAddress() && ip.getHostAddress().indexOf(":") == -1) {
			localIP = ip.getHostAddress();
			break;
			}
			}
			} catch (Exception e) {
			try {
			localIP = InetAddress.getLocalHost().getHostAddress();
			} catch (UnknownHostException e1) {
			e1.printStackTrace();
			}
			}
			return localIP;
			}
			/**
			* 获取客户端IP
			*
			* @param request 请求对象
			* @return IP地址
			*/
			public static String getClientIp(HttpServletRequest request)
			{
			if (request == null)
			{
			return "unknown";
			}
			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("X-Forwarded-For");
			}
			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("X-Real-IP");
			}

			if (ip == null \|\| ip.length() == 0 \|\| "unknown".equalsIgnoreCase(ip))
			{
			ip = request.getRemoteAddr();
			}

			return "0:0:0:0:0:0:0:1".equals(ip) ? "127.0.0.1" : getMultistageReverseProxyIp(ip);
			}

			/**
			* 检查是否为内部IP地址
			*
			* @param ip IP地址
			* @return 结果
			*/
			public static boolean internalIp(String ip)
			{
			byte[] addr = textToNumericFormatV4(ip);
			return internalIp(addr) \|\| "127.0.0.1".equals(ip);
			}

			/**
			* 检查是否为内部IP地址
			*
			* @param addr byte地址
			* @return 结果
			*/
			private static boolean internalIp(byte[] addr)
			{
			if (addr == null \|\| addr.length < 2)
			{
			return true;
			}
			final byte b0 = addr[0];
			final byte b1 = addr[1];
			// 10.x.x.x/8
			final byte SECTION_1 = 0x0A;
			// 172.16.x.x/12
			final byte SECTION_2 = (byte) 0xAC;
			final byte SECTION_3 = (byte) 0x10;
			final byte SECTION_4 = (byte) 0x1F;
			// 192.168.x.x/16
			final byte SECTION_5 = (byte) 0xC0;
			final byte SECTION_6 = (byte) 0xA8;
			switch (b0)
			{
			case SECTION_1:
			return true;
			case SECTION_2:
			if (b1 >= SECTION_3 && b1 <= SECTION_4)
			{
			return true;
			}
			case SECTION_5:
			switch (b1)
			{
			case SECTION_6:
			return true;
			}
			default:
			return false;
			}
			}
			/**
			* 把ip转化为整数
			*
			* @param ip
			* @return
			*/
			public static long translateIP2Int(String ip) {
			String[] intArr = ip.split("\\.");
			int[] ipInt = new int[intArr.length];
			for (int i = 0; i < intArr.length; i++) {
			ipInt[i] = Integer.parseInt(intArr[i]) ;
			}
			return ipInt[0] * 256 * 256 * 256 + +ipInt[1] * 256 * 256 + ipInt[2] * 256 + ipInt[3];
			}
			/**
			* 将IPv4地址转换成字节
			*
			* @param text IPv4地址
			* @return byte 字节
			*/
			public static byte[] textToNumericFormatV4(String text)
			{
			if (text.length() == 0)
			{
			return null;
			}

			byte[] bytes = new byte[4];
			String[] elements = text.split("\\.", -1);
			try
			{
			long l;
			int i;
			switch (elements.length)
			{
			case 1:
			l = Long.parseLong(elements[0]);
			if ((l < 0L) \|\| (l > 4294967295L))
			{
			return null;
			}
			bytes[0] = (byte) (int) (l >> 24 & 0xFF);
			bytes[1] = (byte) (int) ((l & 0xFFFFFF) >> 16 & 0xFF);
			bytes[2] = (byte) (int) ((l & 0xFFFF) >> 8 & 0xFF);
			bytes[3] = (byte) (int) (l & 0xFF);
			break;
			case 2:
			l = Integer.parseInt(elements[0]);
			if ((l < 0L) \|\| (l > 255L))
			{
			return null;
			}
			bytes[0] = (byte) (int) (l & 0xFF);
			l = Integer.parseInt(elements[1]);
			if ((l < 0L) \|\| (l > 16777215L))
			{
			return null;
			}
			bytes[1] = (byte) (int) (l >> 16 & 0xFF);
			bytes[2] = (byte) (int) ((l & 0xFFFF) >> 8 & 0xFF);
			bytes[3] = (byte) (int) (l & 0xFF);
			break;
			case 3:
			for (i = 0; i < 2; ++i)
			{
			l = Integer.parseInt(elements[i]);
			if ((l < 0L) \|\| (l > 255L))
			{
			return null;
			}
			bytes[i] = (byte) (int) (l & 0xFF);
			}
			l = Integer.parseInt(elements[2]);
			if ((l < 0L) \|\| (l > 65535L))
			{
			return null;
			}
			bytes[2] = (byte) (int) (l >> 8 & 0xFF);
			bytes[3] = (byte) (int) (l & 0xFF);
			break;
			case 4:
			for (i = 0; i < 4; ++i)
			{
			l = Integer.parseInt(elements[i]);
			if ((l < 0L) \|\| (l > 255L))
			{
			return null;
			}
			bytes[i] = (byte) (int) (l & 0xFF);
			}
			break;
			default:
			return null;
			}
			}
			catch (NumberFormatException e)
			{
			return null;
			}
			return bytes;
			}

			/**
			* 获取IP地址
			*
			* @return 本地IP地址
			*/
			public static String getHostIp()
			{
			try
			{
			return InetAddress.getLocalHost().getHostAddress();
			}
			catch (UnknownHostException e)
			{
			}
			return "127.0.0.1";
			}

			/**
			* 获取主机名
			*
			* @return 本地主机名
			*/
			public static String getHostName()
			{
			try
			{
			return InetAddress.getLocalHost().getHostName();
			}
			catch (UnknownHostException e)
			{
			}
			return "未知";
			}

			/**
			* 从多级反向代理中获得第一个非unknown IP地址
			*
			* @param ip 获得的IP地址
			* @return 第一个非unknown IP地址
			*/
			public static String getMultistageReverseProxyIp(String ip)
			{
			// 多级反向代理检测
			if (ip != null && ip.indexOf(",") > 0)
			{
			final String[] ips = ip.trim().split(",");
			for (String subIp : ips)
			{
			if (false == isUnknown(subIp))
			{
			ip = subIp;
			break;
			}
			}
			}
			return ip;
			}

			/**
			* 检测给定字符串是否为未知，多用于检测HTTP请求相关
			*
			* @param checkString 被检测的字符串
			* @return 是否未知
			*/
			public static boolean isUnknown(String checkString)
			{
			return isBlank(checkString) \|\| "unknown".equalsIgnoreCase(checkString);
			}

			private static boolean isBlank(final CharSequence cs) {
			final int strLen = length(cs);
			if (strLen == 0) {
			return true;
			}
			for (int i = 0; i < strLen; i++) {
			if (!Character.isWhitespace(cs.charAt(i))) {
			return false;
			}
			}
			return true;
			}
			public static int length(final CharSequence cs) {
			return cs == null ? 0 : cs.length();
			}

			public static void main(String[] args) {
			String ip = "1.2.3.4";
			if(internalIp(ip)){
			System.out.println("内部IP");
			}
			}
			}