对JAVA框架的练习，包括实体类，接口，数据库连接等。-Practice of JAVA framework, including entity class, interface, connection, etc.

ssm框架开发北大青鸟超市后台管理系统。利用mybatis的反向工程生成的dao、entity、mapper(SSM framework develops the background management system of Beida Bluebird Supermarket. Dao, entity, mapper generated by reverse engineering of mybatis)