Spring XmlBeanFactory例子[转]

// 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"
 "http://www.springframework.org/dtd/spring-beans-2.0.dtd">
 
<beans>
    <bean ></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。