java - 为什么 Spring ProxyFactoryBean 隐式定义有效？

Question

我有以下定义:

<bean id="myInterceptor" class="info.fastpace.MyInterceptor"/>

<bean id="alikProxy" class="org.springframework.aop.framework.ProxyFactoryBean">
    <property name="target" ref="myClass"/>
    <property name="interceptorNames">
        <list>
            <value>myInterceptor</value>
        </list>
    </property>
</bean>

我定义了 2 个类:MyInterceptor 和 MyClass。

奇怪的是，Spring 知道在调用类 MyClass(大写 M)之前调用拦截器，即使该类未在 commonContext.xml 文件中配置。唯一的提示是代理 bean 定义中的 myClass(小写 m)。

删除 alikProxy bean 定义时，不会调用拦截器。

Spring 如何知道使用 未定义 myClass 引用来调用 MyClass 的拦截器？

Answer 1

看起来您定义了一个类 MyClass 的 bean ，但没有显式地给它任何名称，所以Spring只是给了它一个默认名称 myClass ，基于类名MyClass .

更新
我想在你的 Spring 上下文 xml 中的某个地方你有 <context:component-scan>元素。

这是书 Spring In Action, 3rd Edition 的片段:

By default, <context:component-scan> looks for classes that are annotated with one of a handful of special stereotype annotations:

• @Component—A general-purpose stereotype annotation indicating that the class is a Spring component

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For example, suppose that our application context only has the eddie and guitar beans in it. We can eliminate the explicit <bean> declarations from the XML configuration by using <context:component-scan> and annotating the Instrumentalist and Guitar classes with @Component.

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When Spring scans the com.springinaction.springidol package, it’ll find that Guitar is annotated with @Component and will automatically register it in Spring. By default, the bean’s ID will be generated by camel-casing the class name. In the case of Guitar that means that the bean ID will be guitar.