如何以编程方式在Spring中注册FactoryBean的实例 [英] How to programatically register an instance of a FactoryBean in Spring

问题描述

我有一组 FactoryBean 的实例，其类型为 MyFactoryBean 。构造函数接受 Class<？> 并使用它来确定从 getObject（）返回的内容：

I have a set of instances of FactoryBean which are of type MyFactoryBean. The constructor takes a Class<?> and uses that to determine what to return from getObject():

public class MyFactoryBean implements FactoryBean {

    private final Class<?> type;

    public MyFactoryBean(Class<?> type) {
        this.type = type;
    }

    @Override
    public Object getObject() throws Exception {
        return null; // Obviously I return something here rather than null!
    }

    @Override
    public Class<?> getObjectType() {
        return type;
    }

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

我的最终结果是控制什么时候返回传递给 MyFactoryBean 的构造函数的类型实例是从上下文中请求的。

My end result is to control what is returned when an instance of type passed to the constructor of the MyFactoryBean is requested from the context.

我可以用my注册它们像这样的上下文：

I can register them with my context like this:

AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
context.getBeanFactory().registerSingleton(..., ...);

但感觉不对，自动装配不起作用。如何在我的上下文中注册这些？

But it doesn't feel right, and autowiring doesn't work. How do I register these with my context?

编辑：自动装配，我有Sean Patrick Floyd在这里回应：如何获得由FactoryBean spring创建的bean管理？但这仍然无法回答我的问题。

for the autowiring, I have noted Sean Patrick Floyd response here: How to get beans created by FactoryBean spring managed? but this still doesn't answer my question.

推荐答案

我创建了这个解决方案最后，但我不确定它是否是最好的：

I created this solution in the end, but I am not sure whether its the best or not:

    AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
    context.addBeanFactoryPostProcessor(new BeanDefinitionRegistryPostProcessor() {

        @Override
        public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {
            ConstructorArgumentValues cav = new ConstructorArgumentValues();
            cav.addGenericArgumentValue(MyClass.class);

            RootBeanDefinition bean = new RootBeanDefinition(MyFactoryBean.class, cav, null);
            AnnotationBeanNameGenerator generator = new AnnotationBeanNameGenerator();

            registry.registerBeanDefinition(generator.generateBeanName(bean, registry), bean);
        }

        @Override
        public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException { }
    });

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