1.IOC及Bean容器

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2.Spring 注入

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<必须要有get/set方法> < property name=”” ref=””>

⭐️

* name= 当前Bean中class所在的类的注入的属性的 成员变量名

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* ref=表示引用 下一个的ID值

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** <必须要有构造器方法>

3.实战–IOC

3.1传统的new 方式实现接口编程

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3.2使用Bean开发

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3.2 set注入

1.Dao层

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2.service层

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3.3 构造方法注入

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