spring之BeanNameAware

最新推荐文章于 2025-07-29 23:44:27 发布

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本文深入解析了Spring框架中BeanNameAware接口的实现原理及其在Bean初始化过程中的作用。通过源码分析，展示了如何在Bean创建过程中注入Bean名称，并介绍了与Bean初始化相关的其他Aware接口。

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//BeanNameAware该接口主要用于获取自身在spring中的名称
public interface BeanNameAware extends Aware {

	void setBeanName(String name);

}

//其实现原理也是在创建bean的时候进行注入
//AbstractAutowireCapableBeanFactory类下
protected Object initializeBean(final String beanName, final Object bean, RootBeanDefinition mbd) {
		if (System.getSecurityManager() != null) {
			AccessController.doPrivileged(new PrivilegedAction<Object>() {
				@Override
				public Object run() {
					invokeAwareMethods(beanName, bean);
					return null;
				}
			}, getAccessControlContext());
		}
		else {   
		        //这里初始化
			invokeAwareMethods(beanName, bean);
		}

		Object wrappedBean = bean;
		if (mbd == null || !mbd.isSynthetic()) {
			wrappedBean = applyBeanPostProcessorsBeforeInitialization(wrappedBean, beanName);
		}

		try {
			invokeInitMethods(beanName, wrappedBean, mbd);
		}
		catch (Throwable ex) {
			throw new BeanCreationException(
					(mbd != null ? mbd.getResourceDescription() : null),
					beanName, "Invocation of init method failed", ex);
		}

		if (mbd == null || !mbd.isSynthetic()) {

			wrappedBean = applyBeanPostProcessorsAfterInitialization(wrappedBean, beanName);
		}
		return wrappedBean;
	}


private void invokeAwareMethods(final String beanName, final Object bean) {
		if (bean instanceof Aware) {
		        //注入beanName
			if (bean instanceof BeanNameAware) {
				((BeanNameAware) bean).setBeanName(beanName);
			}
			//注入加载bean的类加载器
			if (bean instanceof BeanClassLoaderAware) {
				((BeanClassLoaderAware) bean).setBeanClassLoader(getBeanClassLoader());
			}
			//注入BeanFactory
			if (bean instanceof BeanFactoryAware) {
				((BeanFactoryAware) bean).setBeanFactory(AbstractAutowireCapableBeanFactory.this);
			}
		}
	}