Spring動態註冊Bean以及應用

動態註冊Bean到Spring容器是很簡單的，咱們只要繼承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);
    }
}

還能夠重載postProcessBeanFactory來完成一樣的事情,註冊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等採用了這個技術來實現Bean的動態註冊.