java通过request对象获取用户IP地址

妖狐艹你老母 2023-10-12 11:04 50阅读 0赞

package com.test.util;
    
    import java.net.InetAddress;
    import javax.servlet.http.HttpServletRequest;
    import org.apache.commons.lang3.StringUtils;
    import lombok.extern.slf4j.Slf4j;
    
    @Slf4j
    public class IPUtils {
    
    	private static final String IP_UTILS_FLAG = ",";
        private static final String UNKNOWN = "unknown";
        private static final String LOCALHOST_IP = "0:0:0:0:0:0:0:1";
        private static final String LOCALHOST_IP1 = "127.0.0.1";
    
        /**
         * 获取IP地址
         * 如果使用了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP地址，X-Forwarded-For中第一个非unknown的有效IP字符串，则为真实IP地址
         */
        public static String getIpAddress(HttpServletRequest request) {
            //以下两个获取在k8s中，将真实的客户端IP，放到了x-Original-Forwarded-For。而将WAF的回源地址放到了 x-Forwarded-For了。
            String ip = request.getHeader("X-Original-Forwarded-For");
            if (StringUtils.isEmpty(ip) || UNKNOWN.equalsIgnoreCase(ip)) {
                ip = request.getHeader("X-Forwarded-For");
            }
            //获取nginx等代理的ip
            if (StringUtils.isEmpty(ip) || UNKNOWN.equalsIgnoreCase(ip)) {
                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("WL-Proxy-Client-IP");
            }
            if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
                ip = request.getHeader("HTTP_CLIENT_IP");
            }
            if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
                ip = request.getHeader("HTTP_X_FORWARDED_FOR");
            }
            //兼容k8s集群获取ip
            if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
                ip = request.getRemoteAddr();
                if (LOCALHOST_IP1.equalsIgnoreCase(ip) || LOCALHOST_IP.equalsIgnoreCase(ip)) {
                    //根据网卡取本机配置的IP
                    InetAddress iNet = null;
                    try {
                        iNet = InetAddress.getLocalHost();
                    } catch (Exception e) {
                        log.error("getClientIp error: {}", e);
                    }
                    ip = iNet.getHostAddress();
                }
            }
    
            //使用代理，则获取第一个IP地址
            if (!StringUtils.isEmpty(ip) && ip.indexOf(IP_UTILS_FLAG) > 0) {
                ip = ip.substring(0, ip.indexOf(IP_UTILS_FLAG));
            }
            return ip;
        }
        
    }