Guice：使用@Named 注入映射绑定

Question

我想要以下注入模型。 Guice 可以做到这一点吗？

模块：

protected void configure() {
    MapBinder<String, IService> mapBinder = MapBinder.newMapBinder(binder(), String.class, IService.class);
    mapBinder.addBinding("keyA").to(IServiceA.class);
    mapBinder.addBinding("keyB").to(IserviceB.class);
}

Class:

class SomeClass {
    private final IService service;

    @Inject
    SomeClass(@Named("KeyA") final IService serviceInstance) {
        this.service = serviceInstance;
    }
}

Answer 1

@Named注释必须添加到方法的参数上。

class SomeClass {
    private final IService service;

    @Inject
    SomeClass(@Named("KeyA") final IService serviceInstance) {
        this.service = serviceInstance;
    }
}

https://github.com/google/guice/wiki/Injections#method-injection

Answer 2

这不是地图活页夹的用途。在您的示例中，绑定注释将是可行的方法： https://github.com/google/guice/wiki/BindingAnnotations

protected void configure() {
    bind(IServiceA.class).annotatedWith(Names.named("keyA"));
    bind(IServiceB.class).annotatedWith(Names.named("keyB"));
}

Guice：使用@Named 注入映射绑定

Guice: Injecting map binding with @Named

java

dependency-injection

guice

模块：