ObjectFactory 与 BeanFactory 的区别

Bertha 。 2022-11-01 05:29 133阅读 0赞

ObjectFactory 与 BeanFactory 都提供查找实例的能力。

按照单词理解

*  ObjectFactory 是对象的工厂
 *  BeanFactory 是 Bean 的工厂

**ObjectFactory** 接口通常用于封装一个通用的工厂。仅关注一个或一种类型的对象的生产（查找）。

ObjectFactoryCreatingFactoryBean 可以实现 Bean 的延迟加载；TargetBeanObjectFactory 是其静态内部类，实现了 ObjectFactory 接口，用于生产 targetBeanName 的 Bean 对象。

public class ObjectFactoryCreatingFactoryBean extends AbstractFactoryBean<ObjectFactory<Object>> {
        //设置目标 Bean 名称
        private String targetBeanName;
        public void setTargetBeanName(String targetBeanName) {
            this.targetBeanName = targetBeanName;
        }
        public void afterPropertiesSet() throws Exception {
            Assert.hasText(this.targetBeanName, "Property 'targetBeanName' is required");
            super.afterPropertiesSet();
        }
        public Class<?> getObjectType() {
            return ObjectFactory.class;
        }
        //返回实现 ObjectFactory 的静态内部类 TargetBeanObjectFactory
        protected ObjectFactory<Object> createInstance() {
            return new TargetBeanObjectFactory(getBeanFactory(), this.targetBeanName);
        }
        private static class TargetBeanObjectFactory implements ObjectFactory<Object>, Serializable {
            private final BeanFactory beanFactory;
            private final String targetBeanName;
            public TargetBeanObjectFactory(BeanFactory beanFactory, String targetBeanName) {
                this.beanFactory = beanFactory;
                this.targetBeanName = targetBeanName;
            }
            //生成对象的能力，来自于通过构造方法持有的 BeanFactory 对象
            public Object getObject() throws BeansException {
                return this.beanFactory.getBean(this.targetBeanName);
            }
        }
    }

**BeanFactory** 提供了获取各种 Bean 的能力，不用多说了。

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[Bean]: https://www.javanav.com/val/3fdc7ac3bd034a5ab7040e23f37153fa.html
[Bean 1]: https://www.javanav.com/val/59101a7207864f4aa971e5c48b592c77.html
[maven _ tomcat _ jar _ web]: https://www.javanav.com/val/b1f4691bd6ba488a80e3bdfcefdec33c.html
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[Spring IoC 1]: https://www.javanav.com/val/a835e6c709ea439ebb21a80f1bf77926.html
[Spring IoC 2]: https://www.javanav.com/val/e377beac22644c2c85308079b239a0fd.html
[Spring bean]: https://www.javanav.com/val/7f8c2e1f24db46e79bc4b9b04f9ad715.html
[Spring-IoC]: https://www.javanav.com/val/a412668efda74412a13f6df9a6d2c714.html
[Spring 1]: https://www.javanav.com/val/6eac12a548ea40c68ff64b1af307563a.html
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