web获取ip地址

最新推荐文章于 2023-12-01 10:32:27 发布

原创最新推荐文章于 2023-12-01 10:32:27 发布 · 2.9k 阅读

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#web #request获取ip

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本文介绍了一种通过多种Header获取客户端真实IP地址的方法，特别适用于经过代理服务器或负载均衡的情况。该方法逐步尝试从不同的Header中获取IP信息，并通过判断确保获取的是有效的公网IP地址。

/**
     * 获取请求主机IP地址,如果通过代理进来，则透过防火墙获取真实IP地址;
     *
     * @param request
     * @return 真实ip地址
     */
    public final static String getIpAddress(HttpServletRequest request) {
        String ip=request.getRemoteAddr();
        if(null==ip||"127.0.0.1".equals(ip)){
            // 获取请求主机IP地址,如果通过代理进来，则透过防火墙获取真实IP地址
            ip = request.getHeader("X-Forwarded-For");
            if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
                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");
                }
                if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
                    ip = request.getHeader("X-Real-IP");
                }
                if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
                    ip = request.getRemoteAddr();
                }
            } else if (ip.length() > 15) {
                String[] ips = ip.split(",");
                for (int index = 0; index < ips.length; index++) {
                    String strIp = (String) ips[index];
                    if (!("unknown".equalsIgnoreCase(strIp))) {
                        ip = strIp;
                        break;
                    }
                }
            }
        }

        return ip;
    }