springboot作為后臺(tái)代碼，獲取到的登錄IP是前臺(tái)的代理服務(wù)器地址，并不是用戶的真實(shí)IP地址，讓我們?cè)谧鼋y(tǒng)計(jì)的時(shí)候無(wú)從下手。下面是一個(gè)后臺(tái)獲取IP地址的類，本質(zhì)上沒(méi)有什么問(wèn)題，問(wèn)題在于，Nginx給你的就是一個(gè)代理之后的地址，所以你當(dāng)然獲取不到真實(shí)的地址了。

package com.**.common.core.utils.ip;

import java.net.InetAddress;
import java.net.UnknownHostException;
import javax.servlet.http.HttpServletRequest;
import com.**.common.core.utils.StringUtils;
import org.springframework.http.HttpHeaders;
import org.springframework.http.server.reactive.ServerHttpRequest;

/**
 * 獲取IP方法
 * 
 * @author Hxhh
 */
public class IpUtils
{
    /**
     * 獲取客戶端IP
     * 
     * @param request 請(qǐng)求對(duì)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);
    }

    public static String getIpAddr(ServerHttpRequest request) {
        HttpHeaders headers = request.getHeaders();
        String ip = headers.getFirst("x-forwarded-for");
        if (ip != null && ip.length() != 0 && !"unknown".equalsIgnoreCase(ip)) {
            // 多次反向代理后會(huì)有多個(gè)ip值，第一個(gè)ip才是真實(shí)ip
            if (ip.indexOf(",") != -1) {
                ip = ip.split(",")[0];
            }
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = headers.getFirst("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = headers.getFirst("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = headers.getFirst("HTTP_CLIENT_IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = headers.getFirst("HTTP_X_FORWARDED_FOR");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = headers.getFirst("X-Real-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddress().getAddress().getHostAddress();
        }
        return ip;
    }


    /**
     * 檢查是否為內(nèi)部IP地址
     * 
     * @param ip IP地址
     * @return 結(jié)果
     */
    public static boolean internalIp(String ip)
    {
        byte[] addr = textToNumericFormatV4(ip);
        return internalIp(addr) || "127.0.0.1".equals(ip);
    }

    /**
     * 檢查是否為內(nèi)部IP地址
     * 
     * @param addr byte地址
     * @return 結(jié)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;
        }
    }

    /**
     * 將IPv4地址轉(zhuǎn)換成字節(jié)
     * 
     * @param text IPv4地址
     * @return byte 字節(jié)
     */
    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;
    }

    /**
     * 獲取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";
    }

    /**
     * 獲取主機(jī)名
     * 
     * @return 本地主機(jī)名
     */
    public static String getHostName()
    {
        try
        {
            return InetAddress.getLocalHost().getHostName();
        }
        catch (UnknownHostException e)
        {
        }
        return "未知";
    }

    /**
     * 從多級(jí)反向代理中獲得第一個(gè)非unknown IP地址
     *
     * @param ip 獲得的IP地址
     * @return 第一個(gè)非unknown IP地址
     */
    public static String getMultistageReverseProxyIp(String ip)
    {
        // 多級(jí)反向代理檢測(cè)
        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;
    }

    /**
     * 檢測(cè)給定字符串是否為未知，多用于檢測(cè)HTTP請(qǐng)求相關(guān)
     *
     * @param checkString 被檢測(cè)的字符串
     * @return 是否未知
     */
    public static boolean isUnknown(String checkString)
    {
        return StringUtils.isBlank(checkString) || "unknown".equalsIgnoreCase(checkString);
    }
}

那么如何識(shí)別客戶端的真實(shí)IP呢，需要通過(guò)兩種方式去判斷：

1、沒(méi)有代理
如果只是普通的web項(xiàng)目的話，通過(guò) request.getRemoteAddr(); （HttpServletRequest 類型） 即可獲取到客戶端的真實(shí)IP

2、Nginx代理
在有代理的情況下，由于任何請(qǐng)求首先經(jīng)過(guò)Nginx，故通過(guò)request.getRemoteAddr()獲取的其實(shí)是Nginx的IP，并非真實(shí)的客戶端IP;此時(shí)通過(guò)x-forwarded-for獲取的IP為："客戶端，代理1，代理2，..."或者"偽造IP,客戶端，代理1，代理2，..."，故不能獲取到準(zhǔn)確的客戶端IP，此時(shí)需要配置Nginx TCP客戶端連接的真實(shí)IP，通過(guò)代理配置獲取真實(shí)IP，可以通過(guò)$remote_addr獲取客戶端IP，Nginx配置如下：

location / {
   //追加如下代碼
   proxy_set_header X-Real-IP $remote_addr;
   proxy_set_header Host $host;
   proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
 
}

?然后服務(wù)端通過(guò)： request.getHeader("X-Real-IP"); ? ?即可獲取到客戶端的真實(shí)IP文章來(lái)源地址http://www.zghlxwxcb.cn/news/detail-797915.html

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