java - 注入(inject)具有特定接口(interface)的所有 bean 列表

Question

我有一个看起来像这样的类(@Component bean):

@Component
public class EntityCleaner {

    @Autowired
    private List<Cleaner> cleaners;

    public void clean(Entity entity) {
         for (Cleaner cleaner: cleaners) {
             cleaner.clean(entity);
         }
    }
}

Cleaner 是一个界面，我有一些清洁器，我希望它们都运行(不要介意顺序)。今天我做了这样的事情:

 @Configuration
 public class MyConfiguration {
     @Bean
     public List<Cleaner> businessEntityCleaner() {
         List<Cleaner> cleaners = new ArrayList<>();
         cleaners.add(new Cleaner1());
         cleaners.add(new Cleaner2());
         cleaners.add(new Cleaner3());
         // ... More cleaners here

         return cleaners;
     }
 }

有没有办法在不定义配置中的特殊方法的情况下构造这个列表？只是那个 Spring 自动神奇地找到所有那些实现 Cleaner的类。接口(interface)，创建列表并将其注入(inject) EntityCleaner ?

Answer 1

@Autowired 的 Javadoc说:

In case of a Collection or Map dependency type, the container autowires all beans matching the declared value type.

因此，您可以执行以下操作:

@Component
public class SomeComponent {

    interface SomeInterface {

    }

    @Component
    static class Impl1 implements SomeInterface {

    }

    @Component
    static class Impl2 implements SomeInterface {

    }

    @Autowired
    private List<SomeInterface> listOfImpls;
}