book增删改查系统

上传者: wangxuanlu | 上传时间: 2022-05-17 21:55:21 | 文件大小: 15.19MB | 文件类型: ZIP
项目的基本框架搭建     所谓三层框架分别为表述层(WEB层)、业务逻辑层()、数据访问层()。     web层(action):包含JSP和Servlet等与web相关的内容,负责与浏览器的响应和请求;     业务层(service):只关心业务逻辑;     数据层(dao):封装了对数据库的访问细节,数据操作类; 关系:web层依赖业务层    业务层依赖数据层(这个关系很重要) ps:除了以上三层框架是我们在写一个javaweb项目必须的外,还需要一个实体类。 ---------------------

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