What is the spring way to autowire factory created instances?

问题

I have a controller which is supposed to create version dependend instances (currently not implemented).

@Controller
public class ReportController {

    @Autowired
    private ReportCompFactory       reportCompFactory;

         public ModelAndView getReport() {
            I_Report report = reportCompFactory.getObject();
                      ^^^^^<- no autowiring in this instance 
         }
     ...
}

The Factory looks like this:

@Component
public class ReportCompFactory implements FactoryBean<I_Report> {

    @Override
    public I_Report getObject() throws BeansException {
        return new ReportComp();
    }

    @Override
    public Class<?> getObjectType() {
        return I_Report.class;
    }

    @Override
    public boolean isSingleton() {
        return false;
    }
}

The created instances fields (@Autowired annotated ) are not set. What should I do, is FactoryBean the right interface to implement?

I would prefer a solution which doesn't involve xml-configurations.

The component itself:

    ReportComp implements I_Report {

        @Autowired
        private ReportDao           reportDao;
                                     ^^^^^^^<- not set after creation
    ...
    }

}

回答1:

Spring doesn't perform autowiring if you create your objects. Here are a few options

define the bean to be of scope prototype - this will make the factory redundant (this is applicable in case you simply want instantiation in the factory)
inject the ReportDao in the factory, and set it to the ReportComp via a setter
inject ApplicationContext in the factory and do ctx.getAutowireCapableBeanFactory().autowireBean(instance)

来源：https://stackoverflow.com/questions/6596655/what-is-the-spring-way-to-autowire-factory-created-instances

标签

java

Spring

autowired