Spring:获取某些接口和类型的所有Bean

Question

在我的Spring Boot应用程序中,假设我有Java接口:

public interface MyFilter<E extends SomeDataInterface> 

(一个很好的例子是Spring的公共接口ApplicationListener <E extends ApplicationEvent>)

我有几个实现,如:

@Component
public class DesignatedFilter1 implements MyFilter<SpecificDataInterface>{...}

@Component
public class DesignatedFilter2 implements MyFilter<SpecificDataInterface>{...}

@Component
public class DesignatedFilter3 implements MyFilter<AnotherSpecificDataInterface>{...}

然后,在某些对象中,我有兴趣利用所有实现MyFilter <SpecificDataInterface> 但不是 MyFilter <AnotherSpecificDataInterface>的过滤器

这会是什么语法？

Answer 1

下面将注入具有将SpecificDataInterface作为泛型参数扩展到List的类型的每个MyFilter实例.

@Autowired
private List<MyFilter<? extends SpecificDataInterface>> list;

Answer 2

你可以简单地使用

@Autowired
private List<MyFilter<SpecificDataInterface>> filters;

Answer 3

如果你想要一张地图，下面的代码将起作用。关键是你定义的方法

private Map<String, MyFilter> factory = new HashMap<>();

@Autowired
public ReportFactory(ListableBeanFactory beanFactory) {
  Collection<MyFilter> interfaces = beanFactory.getBeansOfType(MyFilter.class).values();
  interfaces.forEach(filter -> factory.put(filter.getId(), filter));
}

Answer 4

如果您想要 a Map<String, MyFilter>，其中key( String) 代表 bean 名称：

private final Map<String, MyFilter> services;

public Foo(Map<String, MyFilter> services) {
  this.services = services;
}

这是recommended替代方案：

@Autowired
private Map<String, MyFilter> services;