spring中@Configuration类的范围 [英] Scope of @Configuration Class in spring

问题描述

我们有 @Configuration 类，但它不包含任何 bean 定义，因为它是由某人编写的遗留类，我不想删除 @Configuration 注释，即使没有 bean 定义.不知何故，我想在 Web 应用程序的关闭挂钩上执行逻辑，但不知何故我无法从 contextDestroyed() 方法中的上下文中获取 bean，所以我想使用 @PreDestroy在那个 @Configuration 类上.

We are having @Configuration class, but it doesn't contain any bean definition and as it is a legacy class written by someone i don't want to remove the @Configuration annotation even while there is no bean definition. Somehow i want to perform logic on shutdown hook of web application but somehow i am not able to get bean from context in the contextDestroyed() method so i want to use @PreDestroy on that @Configuration class.

是否有人指定了 @Configuration 类的默认范围.因为我不希望如果作用域是非单一的，那么 @PreDestroy 会被一次又一次地调用.

Does any one specify what is the default scope of the @Configuration class. As I don't want that if the scope is non-singleton that bean would the @PreDestroy will be called again and again.

推荐答案

@Configuration 使用 @Component 进行元注释.这是它的 Scope 规则的来源.@Scope 注释的未指定值的组件(以及那些没有 Scope 注释的组件)默认为 Singleton Scope，可以在相应的 JavaDoc.

@Configuration is meta-annotated with @Component. This is where its Scope rules are derived from. @Scope-annotated components that specify no value (and those without a Scope annotation for that matter) default to Singleton Scope as can be looked up in the respective JavaDoc.

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