带接口的Play和Guice依赖注入

Question

我正在尝试使用接口播放Play / Guice依赖注入：

public interface IService {
    Result handleRequest();
}

public Service implements IService {
    @Override
    public Result handleRequest() {
        ...
        return result;
    }
}

public class Controller {
    private final IService service;

    @Inject
    public Controller(IService service) {
        this.service = service;
    }
}

我明白了：

play.api.UnexpectedException: Unexpected exception[CreationException: Unable to create injector, see the following errors:

1.) No implementation for IService was bound.  

如果我改变控制器类不使用接口它工作正常：

public class Controller {
    private final Service service;

    @Inject
    public Controller(Service service) {
        this.service = service;
    }
}

如何使它与界面一起工作，以便找到具体的Service类？

Answer 1

你可以像这样使用guice注释@ImplementedBy：

import com.google.inject.ImplementedBy;

@ImplementedBy(Service.class)
public interface IService {
    Result handleRequest();
}

或者你可以使用这样的模块：

import com.google.inject.AbstractModule;

public class ServiceModule extends AbstractModule {

    protected void configure() {
        bind(IService.class).to(Service.class);
    }
}

然后在application.conf play.modules.enabled += "modules.ServiceModule"中注册它们