BeanFactory 接口描述

/**
* Used to dereference a {@link FactoryBean} instance and distinguish it from
* beans <i>created</i> by the FactoryBean. For example, if the bean named
* <code>myJndiObject</code> is a FactoryBean, getting <code>&myJndiObject</code>
* will return the factory, not the instance returned by the factory.
*/
String FACTORY_BEAN_PREFIX = "&";

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Object getBean(String name) throws BeansException;

Object getBean(String name, Class requiredType) throws BeansException;返回以给定名称注册的bean实例，并转换为给定class类型的实例，如果转换失败，相应的异常(BeanNotOfRequiredTypeException)将被抛出。上面的getBean(String)方法也适用该规则.

Object getBean(String name, Object[] args) throws BeansException;  如果要创建的对象不为prototype 的话，就会抛出BeanDefinitionStoreException。

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);