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控制层 controller
1.职责
- 调用业务层,封装数据
- 调用业务层,实现功能
- 拿到业务层的返回数据,响应给前端
2.业务层 : 实现功能代码service
1.调用持久层
2.连接控制层和持久层
3.数据持久层: 和数据库打交道
- 真正做事情的层
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