在运行时扫描 Java 注释 [英] Scanning Java annotations at runtime
问题描述
如何在整个类路径中搜索带注释的类?
How do I search the whole classpath for an annotated class?
我正在做一个库,我想允许用户注释他们的类,所以当 Web 应用程序启动时,我需要扫描整个类路径以获取某些注释.
I'm doing a library and I want to allow the users to annotate their classes, so when the Web application starts I need to scan the whole classpath for certain annotation.
我正在考虑 Java EE 5 Web 服务或 EJB 的新功能.您使用 @WebService
或 @EJB
注释您的类,系统会在加载时找到这些类,以便远程访问它们.
I'm thinking about something like the new functionality for Java EE 5 Web Services or EJB's. You annotate your class with @WebService
or @EJB
and the system finds these classes while loading so they are accessible remotely.
推荐答案
使用 org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider
API
从基本包扫描类路径的组件提供程序.然后将排除和包含过滤器应用于结果类以查找候选者.
A component provider that scans the classpath from a base package. It then applies exclude and include filters to the resulting classes to find candidates.
ClassPathScanningCandidateComponentProvider scanner =
new ClassPathScanningCandidateComponentProvider(<DO_YOU_WANT_TO_USE_DEFALT_FILTER>);
scanner.addIncludeFilter(new AnnotationTypeFilter(<TYPE_YOUR_ANNOTATION_HERE>.class));
for (BeanDefinition bd : scanner.findCandidateComponents(<TYPE_YOUR_BASE_PACKAGE_HERE>))
System.out.println(bd.getBeanClassName());
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