一个基于三层架构的网上书店系统，包括注册用户，浏览图书信息，添加图书信息，添加收藏，购买等系统网上书店功能，功能较详细。-An online bookstore based on the three-tier system, including registered users browsing book information, book information to add, add collection, buy online bookstore features and other sy