Spring中BeanPostProcessor实现原理

最新推荐文章于 2024-09-15 14:51:50 发布

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最新推荐文章于 2024-09-15 14:51:50 发布

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分类专栏： Spring 文章标签： Spring BeanPostProcessor

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本文详细解析了Spring框架中Bean的初始化过程，包括属性填充、前置处理、初始化方法调用及后置处理等关键步骤，并提供了核心代码示例。

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//org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory#doCreateBean
//populateBean：Bean属性赋值
   this.populateBean(beanName, mbd, instanceWrapper);
            if (exposedObject != null) {
                exposedObject = this.initializeBean(beanName, exposedObject, mbd);
            }

initializeBean实现如下：

//org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory#initializeBean(java.lang.String, java.lang.Object, org.springframework.beans.factory.support.RootBeanDefinition)

protected Object initializeBean(final String beanName, final Object bean, RootBeanDefinition mbd) {
        if (System.getSecurityManager() != null) {
            AccessController.doPrivileged(new PrivilegedAction<Object>() {
                public Object run() {
                    AbstractAutowireCapableBeanFactory.this.invokeAwareMethods(beanName, bean);
                    return null;
                }
            }, this.getAccessControlContext());
        } else {
            this.invokeAwareMethods(beanName, bean);
        }

        Object wrappedBean = bean;
        if (mbd == null || !mbd.isSynthetic()) {
        //调用前置方法
            wrappedBean = this.applyBeanPostProcessorsBeforeInitialization(bean, beanName);
        }

        try {
        //执行初始化方法
            this.invokeInitMethods(beanName, wrappedBean, mbd);
        } catch (Throwable var6) {
            throw new BeanCreationException(mbd != null ? mbd.getResourceDescription() : null, beanName, "Invocation of init method failed", var6);
        }

        if (mbd == null || !mbd.isSynthetic()) {
        //执行后置方法
            wrappedBean = this.applyBeanPostProcessorsAfterInitialization(wrappedBean, beanName);
        }

        return wrappedBean;
    }