如何在类路径上找到具有特定方法注释的所有类? [英] How can I find all classes on the classpath that have a specific method annotation?

问题描述

我想在 Java 中实现一个基于注解的初始化机制.具体来说，我定义了一个注释:

I want to implement an intialization mechanism that is annotation-based in Java. Specifically, I have an annotation I've defined:

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface Initialization {

/**
 * If the eager initialization flag is set to <code>true</code> then the
 * initialized class will be initialized the first time it is created.
 * Otherwise, it will be initialized the first time it is used.
 * 
 * @return <code>true</code> if the initialization method should be called
 *         eagerly
 */
boolean eager() default false;

}

另外，我有一个界面:

public interface SomeKindOfBasicInterface {}

我想在我的类路径上找到 SomeKindOfBasicInterface 类的每个实现，在方法上有 @Initialization 注释.我正在查看 Spring 的 MetaDataReader 工具，它看起来是在我执行此操作时延迟加载其他 SomeKindOfBasicInterface 实现的最佳方法......但我不是确定如何像我描述的那样进行搜索.有什么提示吗?

I want to find every implementation of the SomeKindOfBasicInterface class on my classpath that has the @Initialization annotation on a method. I'm looking at Spring's MetaDataReader tools, which look like the best way to defer loading the other SomeKindOfBasicInterface implementations while I'm doing this... but I'm not sure how to do a search like I'm describing. Any tips?

推荐答案

你可以使用 Reflections,这是一个 Java 运行时元数据分析工具.我已经用它来获取给定类型的所有子类型，但它也可以处理您的情况.

You could use Reflections, which is a Java runtime metadata analysis tool. I've used it to get all subtypes of a given type, but it can handle your case as well.

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