nginx|Nginx获取真实用户IP nginx|linux

问题概述
通过Nginx反向代理后，HttpServletRequest.getRemoteAddr()方法无法获取到用户的真实IP，只能获取到本机IP127.0.0.1，这是因为传入Java后端的是Nginx本机的IP
解决办法
将用户的IP存储到Nginx的消息头，Java后端直接通过消息头获取用户真实的IP
解决过程
Nginx将真实IP存储到消息头 【nginx|Nginx获取真实用户IP】在Nginx配置文件的http{}中加入以下代码：

# 下面三行为重点，添加后就可以获取到客户端真实IP set_real_ip_from 0.0.0.0/0; real_ip_headerX-Forwarded-For; real_ip_recursive on; # 下面三行为常见反向代理传递真实客户端IP的配置，配置在http{}中，则全局应用在下面的所有server中 proxy_set_header Host$host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

Java获取真实IP

package com.ledao.util; import javax.servlet.http.HttpServletRequest; /** * @author LeDao * @company * @create 2021-12-14 12:20 */ public class IpUtil {public static String getIpAddr(HttpServletRequest request) { String fromSource = "X-Real-IP"; String ip = request.getHeader(fromSource); if (ip == null || ip.length() == 0 || "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.getRemoteAddr(); } return ip; } }