nginx转发后如何获取真实的ip地址

最新推荐文章于 2025-05-27 22:20:26 发布

我不是臭弟弟

最新推荐文章于 2025-05-27 22:20:26 发布

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分类专栏： nginx Java 文章标签： java nginx http

本文链接：https://blog.youkuaiyun.com/qq_43561507/article/details/108415997

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前言

最近做一个团队的打卡系统，需要通过连接实验室WiFi来判是否人在实验室，网上千篇一律的获取主机ip的方法由于我使用了nginx反向代理，导致获取到的ip地址为127.0.0.1，这肯定是不符合我们验证标准的，还有就是失去了校验的意义了。

正确姿势

nginx配置这样配

location / {
		    proxy_pass http://localhost:8090;
			proxy_set_header   X-Real-IP        $remote_addr;
            proxy_set_header   X-Forwarded-For  $remote_addr; 
		}

java获取ip的代码这样写

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();
    }

    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;
    }

}