Utils中：
DriverManager（类）
Connection（接口）
Statement（接口）：用于将普通的SQL语句发送到数据库中。executeQuery（）等4种SQL语句方法
PrepareStatement（接口）继承Statement接口，不同1，包含已编译SQL语句；不同2，包含一个或多个IN参数，可用“？”占位符
ResultSet（接口）：用于获取执行SQL语句/数据库存储过程返回的结果。
客户端<-->JSP界面-->转译-->编译-->servlet-->执行-->返回到JSP界面
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