BeanFactoryPostProcessor进行bean的注入

BeanFactoryPostProcessor 自定义spring进行注入

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.support.GenericBeanDefinition;
import org.springframework.stereotype.Component;

@Component
public class MyPostProcess implements BeanFactoryPostProcessor {
	public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
		GenericBeanDefinition beanDefinition = (GenericBeanDefinition) beanFactory.getBeanDefinition("userServiceImpl");
		//如果需要被注入的bean是接口的实现类，需要将spring默认的jdk代理改为cglib代理
		//因为jdk是代理的接口，cglib是根据具体的类来进行代理的
		beanDefinition.setBeanClass(UserServiceImpl2.class);
		
	}
}

 <aop:aspectj-autoproxy proxy-target-class="true"/>

如果使用默认的jdk代理，会抛出以下异常

Exception in thread "main" org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.simon.UserServiceImpl2' available