本系统只要进行文档的分类管理， 分后台管理和前台展示，后台提供文件信息的增删改查上传、下载 、统计下载次数等功能，前台展示现有的文档信息，并提供下载功能(As long as the system is classified and managed, the system can be divided into the background management and the front display, and the background provides the functions of