两种方式:
-设值注入 xml 设值property
<bean id = "xx" class = "com.example.xxx>
<property name = "类中定义的属性名称" res = "xml中定义的id引用">
</bean>
-构造注入 xml constructor-arg
<bean id = "xx" class = "com.example.xxx>
<constructor-arg name = "类中定义的属性名称" res = "xml中定义的id引用">
</bean>
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