FactoryBean 与ObjectFactory

最新推荐文章于 2024-08-21 16:43:55 发布

xfgp02

最新推荐文章于 2024-08-21 16:43:55 发布

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分类专栏： spring源码解析文章标签： spring

本文链接：https://blog.youkuaiyun.com/xfgp02/article/details/111246013

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本文探讨了Spring框架中的FactoryBean和ObjectFactory，它们都是工厂模式的应用，用于对象的创建。虽然两者在创建对象方面有共同点，但存在细微差别。FactoryBean通常用于创建复杂的对象，而ObjectFactory则提供更简单的延迟初始化对象的方式。

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二者很相似，但也略有区别。通过接口内容来看，两者都是属于工厂模式用来创建对象使用的。

/**
 * Defines a factory which can return an Object instance
 * (possibly shared or independent) when invoked.
 *
 * <p>This interface is typically used to encapsulate a generic factory which
 * returns a new instance (prototype) of some target object on each invocation.
 *
 * <p>This interface is similar to {@link FactoryBean}, but implementations
 * of the latter are normally meant to be defined as SPI instances in a
 * {@link BeanFactory}, while implementations of this class are normally meant
 * to be fed as an API to other beans (through injection). As such, the
 * {@code getObject()} method has different exception handling behavior.
 *
 * @author Colin Sampaleanu
 * @since 1.0.2
 * @param <T> the object type
 * @see FactoryBean
 */
@FunctionalInterface
public interface ObjectFactory<T> {

   /**
    * Return an instance (possibly shared or independent)
    * of the object managed by this factory.
    * @return the resulting instance
    * @throws BeansException in case of creation errors
    */
   T getObject() throws BeansException;

}

/**
 * Interface to be implemented by objects used within a {@link BeanFactory} which
 * are themselves factories for individual objects. If a bean implements this
 * interface, it is used as a factory for an object to expose, not directly as a
 * bean instance that will be exposed itself.
 *
 * <p><b>

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