// Car.java

package com.baobaotao.beanfactory;

public class Car {

    private String brand;

    private String color;

    private int maxSpeed;

    public Car() {

    }

    public void introduce() {

        System.out.println("brand:" + brand + "; color:" + color + "; maxSpeed:"

                + maxSpeed);

    }

    public String getBrand() {

        return brand;

    }

    public void setBrand(String brand) {

        this.brand = brand;

    }

    public String getColor() {

        return color;

    }

    public void setColor(String color) {

        this.color = color;

    }

    public int getMaxSpeed() {

        return maxSpeed;

    }

    public void setMaxSpeed(int maxSpeed) {

        this.maxSpeed = maxSpeed;

    }

}

// beans.xml

<?xml version="1.0" encoding="utf-8"?>

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN"

 "">

 

<beans>

    <bean id="car" class="com.baobaotao.beanfactory.Car">

        <property name="brand" value="红旗CA72"></property>

        <property name="color" value="黑色"></property>

        <property name="maxSpeed" value="200"></property>

    </bean>

</beans>

// BeanFactoryTest.java

package com.baobaotao.beanfactory;

import org.springframework.beans.factory.BeanFactory;

import org.springframework.beans.factory.xml.XmlBeanFactory;

import org.springframework.core.io.ClassPathResource;

import org.springframework.core.io.Resource;

public class BeanFactoryTest {

    public static void main(String[] args) throws Throwable {

        Resource res = new ClassPathResource(

                "com/baobaotao/beanfactory/beans.xml");

        BeanFactory bf = new XmlBeanFactory(res);

        Car car = (Car) bf.getBean("car");

        car.introduce();

    }

}

    Spring用Resource接口表示一个来源无关的资源。这里，我们使用Resource表示Spring配置文件。XmlBeanFactory通过Resource装载Spring配置信息并启动IoC容器，然后就可以能过BeanFactory#getBean(beanName)方法从IoC容器中获取Bean了。通过BeanFactory启动IoC容器时，并不会初始化配置文件中定义的Bean，初始化动作发生在第一个调用时。对于单实例（singleton）的Bean来说，BeanFactory会缓存Bean实例，所以第二次使用getBean()获取Bean时将直接从IoC容器的缓存中获取Bean实例。