获取真实ip

 

public String getReqIp(HttpServletRequest request) {
        String ip = request.getHeader("X-Forwarded-For");
        if (StringUtils.isBlank(ip) || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("X-Real-IP");
        }
        if (StringUtils.isBlank(ip) || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (StringUtils.isBlank(ip) || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (StringUtils.isBlank(ip) || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_CLIENT_IP");
        }
        if (StringUtils.isBlank(ip) || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_X_FORWARDED_FOR");
        }
        if (StringUtils.isBlank(ip) || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        if (StringUtils.isNotBlank(ip) && !"unknown".equalsIgnoreCase(ip) && StringUtils.contains(ip, ",")) {
            // 多次反向代理后会有多个IP值，第一个为真实IP。
            ip = StringUtils.substringBefore(ip, ",");
        }
        // 处理localhost访问
        if (StringUtils.isBlank(ip) || "unkown".equalsIgnoreCase(ip) || StringUtils.split(ip, ".").length != 4) {
            try {
                InetAddress inetAddress = InetAddress.getLocalHost();
                ip = inetAddress.getHostAddress();
            } catch (UnknownHostException e) {
                e.printStackTrace();
            }
        }
        return ip;
    }