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 file
BeanFactory bf = new XmlBeanFactory(reource);
bf.getBean("beanName");