1,创建抽象的产品类

package com.robert.spring.shop;

public abstract class Product {

}

2，创建具体产品类

package com.robert.spring.shop;

public class Battery extends Product {

	private String name;

	private double price;

	public Battery(String name, double price) {

		this.name = name;

		this.price = price;

	}

	public String getName() {

		return name;

	}

	public void setName(String name) {

		this.name = name;

	}

	public double getPrice() {

		return price;

	}

	public void setPrice(double price) {

		this.price = price;

	}

	@Override

	public String toString() {

		return "name=" + name + "\tprice=" + price;

	}

}

package com.robert.spring.shop;

public class Disc extends Product {

	private String name;

	private double price;

	public Disc(String name,double price){

		this.name = name;

		this.price = price;

	}

	public String getName() {

		return name;

	}

	public void setName(String name) {

		this.name = name;

	}

	public double getPrice() {

		return price;

	}

	public void setPrice(double price) {

		this.price = price;

	}

	@Override

	public String toString() {

		return "name="+name+"\tprice="+price;

	}

}

3，创建工厂类

package com.robert.spring.shop;

public class ProductCreator {

	public static Product createProduct(String productId){

		if("aaa".equals(productId)){

			return new Battery("AAA",2.5);

		} else if("cdrw".equals(productId)){

			return new Disc("CD-RW",1.5);

		}

		throw new IllegalArgumentException("Unknown product");

	}

}

4，创建测试类

package com.robert.spring.shop;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class ProductTest {

	public static void main(String[] args) {

		ApplicationContext context = new ClassPathXmlApplicationContext("classpath:/spring/products.xml");

		Product battery = (Battery)context.getBean("aaa");

		System.out.println(battery.toString());

		Product cdrw = (Disc)context.getBean("cdrw");

		System.out.println(cdrw.toString());

	}

}

Spring配置文件内容如下：

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

<!-- Application context definition. -->

<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context"

	xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:aop="http://www.springframework.org/schema/aop"

	xsi:schemaLocation="http://www.springframework.org/schema/beans

	http://www.springframework.org/schema/beans/spring-beans.xsd

	http://www.springframework.org/schema/context

	http://www.springframework.org/schema/context/spring-context.xsd

	http://www.springframework.org/schema/tx

	http://www.springframework.org/schema/jdbc

	http://www.springframework.org/schema/aop

	http://www.springframework.org/schema/jdbc/spring-jdbc.xsd"

	default-autowire="byName">

	<bean id="aaa" class="com.robert.spring.shop.ProductCreator" factory-method="createProduct">

		<constructor-arg value="aaa"/>

	</bean>

	<bean id="cdrw" class="com.robert.spring.shop.ProductCreator" factory-method="createProduct">

		<constructor-arg value="cdrw"/>

	</bean>

</beans>

输出结果为：

name=AAA price=2.5

name=CD-RW price=1.5