学习Spring(二) 调用静态工厂方法创建Bean

package com.robert.spring.shop;

public abstract class Product {

}

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;
}

}

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");
}
}

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());
}
}

<?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>