/**
     * 
     * @description：获取客户端真实IP
     * @param request
     * @return
     */
    public static String getIpAddr(HttpServletRequest request)
    {

        if (request == null)
        {
            return "";
        }
        String 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();
        }
        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");
        }
        // 如果是多级代理，那么取第一个ip为客户ip
        if (ip != null && ip.indexOf(",") != -1)
        {
            ip = ip.substring(ip.lastIndexOf(",") + 1, ip.length()).trim();
        }
        return ip;
    }