Spring Boot Application Get Ip Address

location /api/ {
    proxy_set_header Host $http_host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header REMOTE-HOST $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_pass http://backend:8080;
}

/**
 * @author cxhello
 * @date 2022/9/9
 */
public class IpUtils {
 
    private static final Logger logger = LoggerFactory.getLogger(IpUtils.class);
 
    public static String getIpAddr(HttpServletRequest request) {
        if (request == null) {
            return "unknown";
        }
        String ip = request.getHeader("X-Forwarded-For");
        logger.info("X-Forwarded-For: {}", ip);
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("X-Real-IP");
            logger.info("X-Real-IP: {}", ip);
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
            logger.info("Proxy-Client-IP: {}", ip);
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
            logger.info("WL-Proxy-Client-IP: {}", ip);
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
            logger.info("remoteAddr: {}", ip);
        }
        return "0:0:0:0:0:0:0:1".equals(ip) ? "127.0.0.1" : getMultistageReverseProxyIp(ip);
    }
 
    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 (!isUnknown(subIp)) {
                    ip = subIp;
                    break;
                }
            }
        }
        return ip;
    }
 
    public static boolean isUnknown(String checkString) {
        return StringUtils.isBlank(checkString) || "unknown".equalsIgnoreCase(checkString);
    }
 
}