Spring 源码阅读之BeanFactory

1. BeanFactory 的结构体系如下：

2. XmlBeanFactory ，装载Spring配置信息

package org.springframework.beans.factory.xml;import org.springframework.beans.BeansException;import org.springframework.beans.factory.BeanFactory;import org.springframework.beans.factory.support.DefaultListableBeanFactory;import org.springframework.core.io.Resource;public class XmlBeanFactory extends DefaultListableBeanFactory {private final XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(this);/** * Create a new XmlBeanFactory with the given resource, * which must be parsable using DOM. * @param resource XML resource to load bean definitions from * @throws BeansException in case of loading or parsing errors */public XmlBeanFactory(Resource resource) throws BeansException {this(resource, null);}/** * Create a new XmlBeanFactory with the given input stream, * which must be parsable using DOM. * @param resource XML resource to load bean definitions from * @param parentBeanFactory parent bean factory * @throws BeansException in case of loading or parsing errors */public XmlBeanFactory(Resource resource, BeanFactory parentBeanFactory) throws BeansException {super(parentBeanFactory);this.reader.loadBeanDefinitions(resource);}}

3. BeanFactory 接口

package org.springframework.beans.factory;import org.springframework.beans.BeansException;public interface BeanFactory {String FACTORY_BEAN_PREFIX = "&";Object getBean(String name) throws BeansException;<T> 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);}

4. 运用实例：

Resource reource = null;//load spring configure fileBeanFactory bf = new XmlBeanFactory(reource);bf.getBean("beanName");