spring之通过静态工厂方法配置Bean

Car.java

package com.gong.spring.beans.factory;

public class Car {
private String name;
private double 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;
}
public Car(String name, double price) {
super();
this.name = name;
this.price = price;
}
@Override
public String toString() {
return "Car [name=" + name + ", price=" + price + "]";
}

}

StaticFactory.java

package com.gong.spring.beans.factory;

import java.util.HashMap;
import java.util.Map;

//静态工厂方法：直接调用一个类的静态工厂方法就可以返回Bean的实例
public class StaticFactory {
public static Map<String,Car> cars = new HashMap<String,Car>();
static {
cars.put("baoma",new Car("baoma",200000));
cars.put("benchi",new Car("benchi",300000));
}
public static Car getCar(String name) {
return cars.get(name);
}
}

beans-factory.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

<!-- 通过静态工厂方法来配置Bean，不是配置静态工厂方法实例，而是配置Bean实例 -->
<!-- class:指向静态工厂方法的全类名
factory-method：指向静态工厂方法的名字
constructor-arg：如果静态工厂方法需要传入参数，使用这个来配置参数 -->
<bean id="car" class="com.gong.spring.beans.factory.StaticFactory" factory-method="getCar">
<constructor-arg value="baoma"></constructor-arg>
</bean>
</beans>

Main.java

package com.gong.spring.beans.factory;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Main {
public static void main(String[] args) {
//1.创建spring的IOC容器对象
ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("beans-factory.xml");
//2.从容器中获取Bean实例
Car car = (Car) ctx.getBean("car");
System.out.println(car.toString());
ctx.close();
}
}

输出：