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");