Spring 得到FactoryBean

最新推荐文章于 2025-06-01 13:45:09 发布

原创最新推荐文章于 2025-06-01 13:45:09 发布 · 439 阅读

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本文探讨了Spring框架中FactoryBean的作用及其实现原理。详细解释了如何通过在bean名称前添加特定前缀来直接获取FactoryBean实例，而非其创建的对象。此方法简化了对FactoryBean的使用并增强了配置的灵活性。

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查看源码：

		// Now we have the bean instance, which may be a normal bean or a FactoryBean.
		// If it's a FactoryBean, we use it to create a bean instance, unless the
		// caller actually wants a reference to the factory.
		if (!(beanInstance instanceof FactoryBean) || BeanFactoryUtils.isFactoryDereference(name)) {
			return beanInstance;
		}

	/**
	 * Return whether the given name is a factory dereference
	 * (beginning with the factory dereference prefix).
	 * @param name the name of the bean
	 * @return whether the given name is a factory dereference
	 * @see BeanFactory#FACTORY_BEAN_PREFIX
	 */
	public static boolean isFactoryDereference(String name) {
		return (name != null && name.startsWith(BeanFactory.FACTORY_BEAN_PREFIX));
	}