1 beanFactory 实现
ClassPathResource res=new ClassPathResource("beans.xml"); DefaultListableBeanFactory factory=new DefaultListableBeanFactory(); XmlBeanDefinitionReader reader=new XmlBeanDefinitionReader(factory); reader.loadBeanDefinitions(res); Dog d1=(Dog)factory.getBean("dog");
日志
[main] INFO [org.springframework.beans.factory.xml.XmlBeanDefinitionReader] - Loading XML bean definitions from class path resource [beans.xml]
2通过applictaionContext 方式实现
ApplicationContext ac=new ClassPathXmlApplicationContext("beans.xml"); Dog d=(Dog)ac.getBean("dog");
日志
2013-03-16 21:21:36,266 [main] INFO [org.springframework.beans.factory.xml.XmlBeanDefinitionReader] - Loading XML bean definitions from class path resource [beans.xml] 2013-03-16 21:21:36,919 [main] INFO [org.springframework.beans.factory.support.DefaultListableBeanFactory] - Pre-instantiatin g singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@899e53: defining beans
看看日志,applicationContext似乎就是按照第一个方式得到bean的咯,
现在看下这俩到底有些什么东东咯?
BeanFactory 类是ioc容器最基本的形式,并且提供了IOC容器所应该遵守的最基本的服务契约,勾画了IOC最基本的轮廓。
public interface BeanFactory { String FACTORY_BEAN_PREFIX = "&"; Object getBean(String name) throws BeansException; T getBean(String name, Class<T> requiredType) throws BeansException; <T> T getBean(Class<T> requiredType) throws BeansException; Object getBean(String name, Object... args) throws BeansException; boolean containsBean(String name); boolean isSingleton(String name) throws NoSuchBeanDefinitionException; boolean isPrototype(String name) throws NoSuchBeanDefinitionException; boolean isTypeMatch(String name, Class targetType) throws NoSuchBeanDefinitionException; Class<?> getType(String name) throws NoSuchBeanDefinitionException; String[] getAliases(String name); }
APPlicationContext类,看实现,它继承了BeanFactorys,所以具有BeanFactory的功能,这样ApplicationContext的功能就会比BeanFactory丰富咯。它可以支持不同的信息源,由于它扩展了MessageSource,可以从不同的地方访问资源,由于实现了ResourceLoader,
public interface ApplicationContext extends ListableBeanFactory, HierarchicalBeanFactory, MessageSource, ApplicationEventPublisher, ResourcePatternResolver { String getId(); String getDisplayName(); ApplicationContext getParent(); AutowireCapableBeanFactory getAutowireCapableBeanFactory() throws IllegalStateException; }