Spring动态注册Bean以及应用

动态注册Bean到Spring容器是很简单的，咱们只要继承BeanDefinitionRegistryPostProcessor

@Component
public class TestDynamicRegistBean implements BeanDefinitionRegistryPostProcessor {

    @Override
    public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {
        System.out.println("yzy:TestDynamicRegistBean.postProcessBeanDefinitionRegistry");
        GenericBeanDefinition beanDefinition = new GenericBeanDefinition();
        beanDefinition.setBeanClass(User.class);
        beanDefinition.getPropertyValues().add("name", "yangzhongyu");
        registry.registerBeanDefinition("user", beanDefinition);
    }
}

还能够重载postProcessBeanFactory来完成一样的事情,注册User user 到Spring容器。

@Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException{
        System.out.println("yzy:TestDynamicRegistBean.postProcessBeanFactory");
        GenericBeanDefinition beanDefinition = new GenericBeanDefinition();
        beanDefinition.setBeanClass(User.class);
        beanDefinition.getPropertyValues().add("age", "yangzhongyu");
        ((DefaultListableBeanFactory) beanFactory)
                .registerBeanDefinition("user", beanDefinition);


    }

MyBatis，Dubbo等采用了这个技术来实现Bean的动态注册.