spring中自定义对象交给spring容器管理的4种方式
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2022-03-07 11:08:18
1、自定义一个 BeanDefinition@Componentpublic class BeanPro implements BeanDefinitionRegistryPostProcessor, PriorityOrdered, Ordered { @Override public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {...
1、自定义一个 BeanDefinition
@Component public class BeanPro implements BeanDefinitionRegistryPostProcessor, PriorityOrdered, Ordered { @Override public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException { //查询BeanDefinition final String[] beanDefinitionNames = registry.getBeanDefinitionNames(); for (String beanDefinitionName : beanDefinitionNames) { BeanDefinition beanDefinition = registry.getBeanDefinition(beanDefinitionName); System.out.println(beanDefinition); } GenericBeanDefinition genericBeanDefinition = new GenericBeanDefinition(); genericBeanDefinition.setBeanClass(BeanDefinitionBean.class); MutablePropertyValues propertyValues = genericBeanDefinition.getPropertyValues(); propertyValues.add("name","Jack"); registry.registerBeanDefinition("beanDefinitionBean",genericBeanDefinition); } @Override public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException { BeanDefinitionRegistry registry = (BeanDefinitionRegistry) beanFactory; String[] beanDefinitionNames = registry.getBeanDefinitionNames(); DefaultListableBeanFactory beanFactory1 = (DefaultListableBeanFactory)beanFactory; beanFactory1.setAllowBeanDefinitionOverriding(true); beanFactory1.setAllowCircularReferences(true); beanFactory1.setAllowRawInjectionDespiteWrapping(true); } @Override public int getOrder() { return 0; } }
2、手动创建了对象,并且交给spring管理了
applicationContext.getBeanFactory().registerSingleton("jack", new Jack());
3、实现 FactoryBean接口
/** * * 灵活定义需要我们自己创建的实例的时候,我们可以实现factoryBean接口 * 在getObject方法里面定义实例化过程 * */ @Component public class FactoryBeanDemo implements FactoryBean { @Override public Object getObject() throws Exception { return new Student(); } @Override public Class<?> getObjectType() { return Student.class; } }
4、@Bean注解
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