Java Spring Boot/MVC 获取用户真实客户端IP

获取客户端来源真实ip在很多业务场景都需要，比如微信支付的v2版，要求必须有下单的用户来源IP。下面详解。

从Java代码端获取真实客户端IP

源码参考：

    public static String getRealIp(HttpServletRequest request){
        String ip = request.getHeader("X-Real-IP");
        if (ip == null || ip.isEmpty() || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("X-Forwarded-For");
            if (ip == null || ip.isEmpty() || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("Proxy-Client-IP");
                if (ip == null || ip.isEmpty() || "unknown".equalsIgnoreCase(ip)) {
                    ip = request.getHeader("WL-Proxy-Client-IP");
                    if (ip == null || ip.isEmpty() || "unknown".equalsIgnoreCase(ip)) {
                        ip = request.getHeader("HTTP_CLIENT_IP");
                        if (ip == null || ip.isEmpty() || "unknown".equalsIgnoreCase(ip)) {
                            ip = request.getHeader("HTTP_X_FORWARDED_FOR");
                            if (ip == null || ip.isEmpty() || "unknown".equalsIgnoreCase(ip)) {
                                ip = request.getRemoteAddr();
                            }
                        }
                    }
                }
            }
        }
        return ip;
    }

有时候只从Java代码层是拿不到真实ip的，因为一般项目前面都有代理服务器，例如nginx。所以同时要配置好代理服务的客户端ip转发。

Nginx 代理转发来源客户端真实ip参参考：Nginx代理获取/传递真实ip

Java spring boot spring mvc 来源IP 真实IP

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