java获取客户端ip

package com.quanjude.util;

import javax.servlet.http.HttpServletRequest;

public class IpUtil {

    public static String getIpAdress(HttpServletRequest request){
        String ip = request.getHeader("x-forwarded-for");
        if (ip != null && !ip.isEmpty() && ! "unknown".equalsIgnoreCase(ip)) {
            // 多次反向代理后会有多个ip值，第一个ip才是真实ip
            if (ip.contains(",")) {
                ip = ip.split(",")[0];
            }
        }
        // Proxy-Client-IP:apache 服务代理
        if (ip == null || ip.isEmpty() || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        // WL-Proxy-Client-IP：weblogic 服务代理
        if (ip == null || ip.isEmpty() || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        // HTTP_CLIENT_IP：有些代理服务器
        if (ip == null || ip.isEmpty() || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_CLIENT_IP");
        }
        // HTTP_X_FORWARDED_FOR：用来识别通过HTTP代理或负载均衡方式连接到Web服务器的客户端最原始的IP地址的HTTP请求头字段
        if (ip == null || ip.isEmpty() || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_X_FORWARDED_FOR");
        }
        // X-Real-IP：nginx服务代理
        if (ip == null || ip.isEmpty() || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("X-Real-IP");
        }
        // 还是不能获取到，最后再通过request.getRemoteAddr();获取
        if (ip == null || ip.isEmpty() || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        return ip;
    }
}

参考大佬的文章：

JAVA获取客户端的真实IP_java 客户端ip-优快云博客

【Java开发】之获取客户端真实 IP 地址_java如何获取客户端真实ip-优快云博客