68.安心技术梳理 - 拦截【请求IP】工具，干货

最新推荐文章于 2024-08-08 08:24:48 发布

孜梓不倦

最新推荐文章于 2024-08-08 08:24:48 发布

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本文介绍了一种在Java中从HttpServletRequest获取客户端真实IP地址的方法。通过检查多种HTTP头部信息，如'j-forward-for'、'X-Forwarded-For'等，确保在经过代理服务器或负载均衡器的情况下仍能准确获取IP。此工具适用于Web应用，特别是在需要记录用户活动或进行地理定位服务的场景。

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以下为加载请求的IP工具，供参考：

import javax.servlet.http.HttpServletRequest;

public class IpUtils {

    private static final Logger LOGGER = LoggerFactory.getLogger(IpUtils.class);

    private static final String UNKNOWN = "unknown";
    private static final String IP_SPLITTER = ",";

    public static String getIp(HttpServletRequest request) {
        String ip = getIpFromHeader(request, "j-forward-for");
        if (!StringUtils.hasText(ip) || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = getIpFromHeader(request, "X-Forwarded-For");
        }
        if (!StringUtils.hasText(ip) || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = getIpFromHeader(request, "Proxy-Client-IP");
        }
        if (!StringUtils.hasText(ip) || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = getIpFromHeader(request, "WL-Proxy-Client-IP");
        }
        if (!StringUtils.hasText(ip) || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
            if (StringUtils.hasText(ip) && !UNKNOWN.equalsIgnoreCase(ip)) {
                LOGGER.info("Get ip from remoteAddr,ip:{}", ip);
            }
        }
        if (!StringUtils.hasText(ip) || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = getIpFromHeader(request, "http_client_ip");
        }
        if (!StringUtils.hasText(ip) || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = getIpFromHeader(request, "HTTP_X_FORWARDED_FOR");
        }
        if (StringUtils.hasText(ip) && ip.contains(IP_SPLITTER)) {
            ip = ip.substring(0, ip.indexOf(IP_SPLITTER));
        }
        return ip;
    }

    private static String getIpFromHeader(HttpServletRequest request, String header) {
        String ip = request.getHeader(header);
        if (StringUtils.hasText(ip) && !UNKNOWN.equalsIgnoreCase(ip)) {
            LOGGER.info("Get ip from {},ip:{}", header, ip);
        }
        return ip;
    }
}