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5月22日作业
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 * 控制器 接收用户的请求并将处理结果返回给调用者的工具，本质上就是一个类

    >功能：处理请求，返回处理结果，相当于CPU

    > 用途：处理请求数据

 * 请求对象 可以理解为URL地址、URL对象；将客户端请求的资源以URL的方式发送到服务器上，服务器响应请求并将资源返回给客户端

    > 功能：接受用户请求，响应请求

    > 用途：实现用户界面与数据库的交互


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