转载

BeanFactory和ObjectFactory的区别

BeanFactory

package org.springframework.beans.factory;
import org.springframework.beans.BeansException;
import org.springframework.core.ResolvableType;
import org.springframework.lang.Nullable;
public interface BeanFactory {

    String FACTORY_BEAN_PREFIX = "&";
    Object getBean(String name) throws BeansException;
    <T> T getBean(String name, Class<T> requiredType) throws BeansException;
    Object getBean(String name, Object... args) throws BeansException;
    <T> T getBean(Class<T> requiredType) throws BeansException;
    <T> T getBean(Class<T> requiredType, Object... args) throws BeansException;
    <T> ObjectProvider<T> getBeanProvider(Class<T> requiredType);
    <T> ObjectProvider<T> getBeanProvider(ResolvableType requiredType);
    boolean containsBean(String name);
    boolean isSingleton(String name) throws NoSuchBeanDefinitionException;
    boolean isPrototype(String name) throws NoSuchBeanDefinitionException;
    boolean isTypeMatch(String name, ResolvableType typeToMatch) throws NoSuchBeanDefinitionException;
    boolean isTypeMatch(String name, Class<?> typeToMatch) throws NoSuchBeanDefinitionException;
    @Nullable
    Class<?> getType(String name) throws NoSuchBeanDefinitionException;
    @Nullable
    Class<?> getType(String name, boolean allowFactoryBeanInit) throws NoSuchBeanDefinitionException;
    String[] getAliases(String name);

}

String FACTORY_BEAN_PREFIX = "&";

String FACTORY_BEAN_PREFIX = "&"; 这句代码定义在BeanFactory这个最顶级的接口中。他的作用是如果在使用beanName获取Bean时，在BeanName前添加这个前缀，那么使用这个BeanName获得的Bean实例是其所在FactoryBean的实例，也就是实现 FactoryBean 接口的那个类的Bean实例。

Object getBean(String name) throws BeansException;

通过Bean名称获取Bean

<T> T getBean(String name, Class<T> requiredType) throws BeansException;

根据名称和类型获取Bean

Object getBean(String name, Object... args) throws BeansException;

通过name和对象参数获取Bean

<T> T getBean(Class<T> requiredType) throws BeansException;

通过类型获取Bean

<T> T getBean(Class<T> requiredType, Object... args) throws BeansException;

通过类型和参数获取Bean

<T> ObjectProvider<T> getBeanProvider(Class<T> requiredType);

返回指定ObjectProvider，提供延迟加载功能

<T> ObjectProvider<T> getBeanProvider(ResolvableType requiredType);

Class，Field，Method 类型的延迟加载功能

boolean containsBean(String name);

容器中是否包含名字为name的Bean

boolean isSingleton(String name) throws NoSuchBeanDefinitionException;

Bean是否是单例

boolean isPrototype(String name) throws NoSuchBeanDefinitionException;

判断bean是不是原型

boolean isTypeMatch(String name, ResolvableType typeToMatch) throws NoSuchBeanDefinitionException;

检查具有给定名称的bean是否与指定的类型(Class，Field，Method 类型)匹配。

boolean isTypeMatch(String name, Class<?> typeToMatch) throws NoSuchBeanDefinitionException;

检查具有给定名称的bean是否与指定的类型匹配。

Class<?> getType(String name) throws NoSuchBeanDefinitionException;

确定具有给定名称的bean的类型

Class<?> getType(String name, boolean allowFactoryBeanInit) throws NoSuchBeanDefinitionException;

确定具有给定名称的bean的类型

String[] getAliases(String name);

返回给定bean名称的别名

ObjectFactory

package javax.naming.spi;

import java.util.Hashtable;

import javax.naming.*;


public interface ObjectFactory {
    //为指定对象和环境创建一个对象实例
    public Object getObjectInstance(Object obj, Name name, Context nameCtx,
                                    Hashtable<?,?> environment)
        throws Exception;
}