從HttpServletRequest獲取IP

   public static String getClientIp(HttpServletRequest request) {
        String address = request.getHeader("X-Real-IP");
         if (org.apache.commons.lang3.StringUtils.isNotBlank(address)) {
            return address;
        }

        address = request.getHeader("X-Forwarded-For");
         if (org.apache.commons.lang3.StringUtils.isNotBlank(address)) {
            return address;
        }

        address = request.getRemoteAddr();
        if (org.apache.commons.lang3.StringUtils.isNotBlank(address)) {
            return address;
        }
        return request.getRemoteHost();    }