Spring中BeanFactory与ApplicationContext的差别

区别：
ApplicationContext和BeanFactory相比,提供了更多的扩展功能，但其主要区别在于BeanFactory是延迟加载,如果Bean的某一个属性没有注入，BeanFactory加载后，直至第一次使用getBean方法调用此Bean时才会抛出异常；而ApplicationContext则在初始化自身时检验，这样有利于检查所依赖属性是否注入；所以通常情况下我们选择使用ApplicationContext.
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使用BeanFactory从xml配置文件加载bean:

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.FileSystemResource;

public class BeanFactoryClient{
	
	public static void main(String[] args){
		BeanFactory beanFactory = new XmlBeanFactory(new FileSystemResource("beans.xml"));
		beanFactory.getBean("beanName");
	}
}

使用ApplicationContext从xml配置文件加载bean:

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class ApplicationContextClient{
	
	public static void main(String[] args) {
		ApplicationContext cxt = new ClassPathXmlApplicationContext("beans.xml");
		cxt.getBean("beanName");
	}
}