获取IP地址工具类

Posted 2022-11-29 暴躁的程序猿啊

该工具类可以获取请求的ip地址

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

/**
 * @create: 2022/3/29
 * @author: Tony Stark
 */
public class IpUtils 
    /**
     * 获取客户端IP
     *
     * @param request 请求对象
     * @return IP地址
     */
    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" : 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 (StringUtils.isNull(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;
    

    /**
     * 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 StringUtils.isBlank(checkString) || "unknown".equalsIgnoreCase(checkString);