实例化BeanFactory三种方法

package com.test.spring;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.core.io.Resource;
import org.springframework.beans.factory.xml.XmlBeanFactory;
public class BeanFactoryUsage {
    public static void main(String[] args){
        //从文件系统资源实例化BeanFactory

        //默认从当前的工程目录下开始查找（工程目录/com/test/文件目录）
        org.springframework.core.io.Resource res = new org.springframework.core.io.FileSystemResource("com/test/bean.xml");
        org.springframework.beans.factory.BeanFactory factory = new org.springframework.beans.factory.xml.XmlBeanFactory(res);
        
        //从classpath下的资源实例化BeanFactory (Eclipse中的src/data目录下)
        org.springframework.core.io.Resource  resClasspath = new org.springframework.core.io.ClassPathResource("data/bean2.xml");
        org.springframework.beans.factory.BeanFactory factory2 = new XmlBeanFactory(resClasspath);
        
        //使用ApplicationContext从classpath下的xml文件实例化BeanFacotory
        String classPath = "data/";
        org.springframework.context.ApplicationContext appContext = new org.springframework.context.support.ClassPathXmlApplicationContext(new String[]{classPath+"bean2.xml"});
        //直接生成类工厂的实例。
        org.springframework.beans.factory.BeanFactory factory3 = (BeanFactory)appContext;
    }
}