IpUtils 获取ip 工具类 java

矫情吗；* 2024-03-16 13:54 50阅读 0赞

公司里项目上有时候会检查提交ip，防止多台设备同时使用一个账号。但获取ip是门技术活，现在由我暂且提供一个工具类供使用。

import javax.servlet.http.HttpServletRequest;
    import java.net.InetAddress;
    import java.net.UnknownHostException;
    
    public class IpUtils
    {
        public static String getIpAddr(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" : ip;
        }
    
        public static boolean internalIp(String ip)
        {
            byte[] addr = textToNumericFormatV4(ip);
            return internalIp(addr) || "127.0.0.1".equals(ip);
        }
    
        private static boolean internalIp(byte[] addr)
        {
            if (null == addr || 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;
            }
        }
    
        /**
         * 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;
        }
    
        public static String getHostIp()
        {
            try
            {
                return InetAddress.getLocalHost().getHostAddress();
            }
            catch (UnknownHostException e)
            {
            }
            return "127.0.0.1";
        }
    
        public static String getHostName()
        {
            try
            {
                return InetAddress.getLocalHost().getHostName();
            }
            catch (UnknownHostException e)
            {
            }
            return "unknow";
        }
    }

=========================分割线===========================

文章到此已经结束，以下是紫薯布丁

import javax.servlet.http.HttpServletRequest;  
import java.net.InetAddress;  
import java.net.UnknownHostException;

public class IpUtils  
\{  
public static String getIpAddr(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" : ip;  
\}

public static boolean internalIp(String ip)  
\{  
byte\[\] addr = textToNumericFormatV4(ip);  
return internalIp(addr) || "127.0.0.1".equals(ip);  
\}

private static boolean internalIp(byte\[\] addr)  
\{  
if (null == addr || 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;  
\}  
\}

/\*\*  
\* 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;  
\}

public static String getHostIp()  
\{  
try  
\{  
return InetAddress.getLocalHost().getHostAddress();  
\}  
catch (UnknownHostException e)  
\{  
\}  
return "127.0.0.1";  
\}

public static String getHostName()  
\{  
try  
\{  
return InetAddress.getLocalHost().getHostName();  
\}  
catch (UnknownHostException e)  
\{  
\}  
return "unknow";  
\}  
\}