是否可以将包中的所有类注册为Spring bean？ [英] Is it possible to register all classes within a package as Spring beans

问题描述

我熟悉基于Spring Java的配置选项，包括使用 @Component 和 @Configuration in结合使用 @Bean 注解来注册Spring beans。

然而，当将体面大小的项目转换为Spring时，可以非常费力地系统地触摸项目中的所有类并使用 @Configuration @Bean s进行更新，或者对每个类进行注释类与 @Component 。我们有一个大的Groovy项目需要转换，我想简化这个过程。

我的问题：Spring中是否提供了一个工具它允许你告诉Spring在特定的包中自动配置所有有效的bean候选类？

如果不是，还有哪些其他选项可用？ code> ClassPathBeanDefinitionScanner 就是您所需要的。

  public class Main {
 public static void main（String [] args）{
 GenericApplicationContext context = new GenericApplicationContext（）; 
 ClassPathBeanDefinitionScanner scanner = new ClassPathBeanDefinitionScanner（context，false）; 
 scanner.addIncludeFilter（（metadataReader，metadataReaderFactory） - > true）; 
 scanner.scan（net.company.name）; 
 context.refresh（）; 
 
 A a = context.getBean（A.class）; 
 System.out.println（a.toString（））; 
 
 
 
 
 $ b你可以在包含过滤器中传递自定义逻辑如果你想要。在当前版本中，提供的包中的每个类都将作为一个bean包含在内。
 
 
 
但是，在类中自动构建正确的依赖关系是不可能的，你想要的范围。你需要用手去做。
 
I'm familiar with Springs Java based configuration options, including the usage of @Component and @Configuration in conjunction with @Bean annotations to register Spring beans.

However, when converting a decent size project to Spring, it can be very labor intensive to systematically touch all classes in the project and update with @Configuration @Beans or annotating each class with @Component. We have a large Groovy project to be converted and I would like to simplify the process.

My question: Is there a facility provided in Spring that allows you to tell Spring to auto-configure all valid bean candidate classes within a specific package? 

If not, what other options are available?
解决方案
ClassPathBeanDefinitionScanner is all you need.
public class Main {
    public static void main(String[] args) {
        GenericApplicationContext context = new GenericApplicationContext();
        ClassPathBeanDefinitionScanner scanner = new ClassPathBeanDefinitionScanner(context, false);
        scanner.addIncludeFilter((metadataReader, metadataReaderFactory) -> true);
        scanner.scan("net.company.name");
        context.refresh();

        A a = context.getBean(A.class);
        System.out.println(a.toString());
    }
}
You can pass custom logic in include filter if you want. In current version every class in the provided package will be included as a bean.

But it is impossible to build a right dependency structure on your classes automagically, it really depends on the scope you want. You need to do it by your hands.

                        
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