实现增删改查， 实现条件查询，含有登入界面。适合初学者的一个物流 java web 使用jdbc连接 sqlserver数据库　使用jsp servlet 等技术。(To achieve additions and deletions to check, to achieve conditional query, containing login interface. A logistics java web suitable for beginners uses JDBC to connect SQL Server database using jsp servlet and other technologies.)