设置CDN缓存时间

/**
     * 功能描述: 通过max-age设置CDN缓存<br>
     *
     * @param response
     * @param cacheMinute 缓存时间
     * @see [相关类/方法](可选)
     * @since [产品/模块版本](可选)
     */
    public void setCache(HttpServletResponse response, String cdnCacheTime) {
        // 默认打开(0---打开；1---关闭)
        String on_off_val = "0";
        if ("0".equals(on_off_val)) {
            long now = System.currentTimeMillis();
            long cacheTimeLong = Long.parseLong(cdnCacheTime) * 1000;
            long temTime = cacheTimeLong == 0 ? now : (now - (now % cacheTimeLong));
            response.setDateHeader("Expires", now + cacheTimeLong);
            response.setDateHeader("Last-Modified", temTime);
            response.setHeader("Cache-Control", "max-age=" + cdnCacheTime);
            response.setHeader("Pragma", "Pragma");
        }
    }