Spring源码分析之IOC

先看两种方式在IOC容器取得bean
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;

}