说明：  通过一个经典的教学系统的从无到有的搭建，将mvc的理念简单的融入系统中，附件中有备用数据库和代码完成的详细文档，手把手帮助初学java web的读者完成并学会基本的web开发手段
(Through the construction of a classic teaching system from scratch, the MVC concept is simply integrated into the system, with the spare database and detailed documents of code completion in the attachment, helping the beginners of Java Web to complete and learn the basic web development methods)