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====== 获取requestIP ======
<code java>
/** 因为用户可以伪造http header所以，一般都是最曾的nginx配置：
proxy_set_header X-Forward-For $remote_addr;  表示拿用户真实的IP来放到header的 X-forwarded-for中
后面的层次就直接透传
*/

    public static String getRequestIp(HttpServletRequest request) {
        String ip = request.getHeader("X-Forwarded-For");
        if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("WL-Proxy-Client-IP");
                if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                    ip = request.getHeader("HTTP_CLIENT_IP");
                    if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                        ip = request.getRemoteAddr();
                    }
                }
            }
        } else {
            int index = ip.indexOf(",");
            if (index != -1) {
                ip = ip.substring(0, index);
            }
        }
        return ip;
    }
</code>