Spring学习-day08

<?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. 注意不是配置静态工厂方法实例，而是配置 bean 实例 -->
	<!--
		class 属性：指向静态工厂方法的全类名
		factory-method: 指向静态工厂方法名字
		constructor-arg: 如果工厂方法需要传入参数，则使用 constructor-arg 来配置参数
	 -->
	<bean id="car1" 
		class="com.atguigu.spring.beans.factory.StaticCarFactory"
		factory-method="getCar">
		<constructor-arg value="audi"></constructor-arg>
	</bean>
	
	<!-- 配置工厂的实例 -->
	<bean id="carFactory" class="com.atguigu.spring.beans.factory.InstanceCarFactory"></bean>
	
	<!-- 通过实例工厂方法配置 bean -->
	<!--
		factory-bean 属性：指向实例工厂方法的全类名
		factory-method: 指向实例工厂方法名字
		constructor-arg: 如果工厂方法需要传入参数，则使用 constructor-arg 来配置参数
	 -->
	<bean id="car2" factory-bean="carFactory" factory-method="getCar">
		<constructor-arg value="ford"></constructor-arg>
	</bean>
</beans>

package com.atguigu.spring.beans.factory;

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

/**
 * 实例工厂方法：实例工厂的方法. 即先需要创建工厂本身，在调用工厂的实例方法来返回bean的实例 
 *
 */
public class InstanceCarFactory {
	private Map<String, Car> cars = null;

	public InstanceCarFactory() {
		cars = new HashMap<String, Car>();
		cars.put("audi", new Car("audi", 300000));
		cars.put("ford", new Car("ford", 400000));
	}
	
	public Car getCar(String brand) {
		return cars.get(brand);
	}
	
}

package com.atguigu.spring.beans.factory;

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

/**
 *	静态工厂方法：
 *		直接调用某一个类的静态方法就可以返回 bean 的实例(可以在不创建StaticCarFactory对象的方法下通过静态工厂方法就可以返回 bean 的实例)
 */
public class StaticCarFactory {
	private static Map<String, Car> cars = new HashMap<String, Car>();
	
	static{
		cars.put("audi", new Car("audi", 300000));
		cars.put("ford", new Car("ford", 400000));
	}
	
	//静态工厂方法
	public static Car getCar(String name) {
		return cars.get(name);
	}
}

package com.atguigu.spring.beans.factory;

public class Car {
	private String brand;
	private double price;
	
	public String getBrand() {
		return brand;
	}
	public void setBrand(String brand) {
		this.brand = brand;
	}
	public double getPrice() {
		return price;
	}
	public void setPrice(double price) {
		this.price = price;
	}
	
	@Override
	public String toString() {
		return "Car [brand=" + brand + ", price=" + price + "]";
	}
	
	public Car() {
		System.out.println("容器被创建...");
		// TODO Auto-generated constructor stub
	}
	public Car(String brand, double price) {
		super();
		this.brand = brand;
		this.price = price;
	}
	
	
	
}

package com.atguigu.spring.beans.factory;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Main {

	public static void main(String[] args) {
		ApplicationContext ctx = new ClassPathXmlApplicationContext("beans-factory.xml");
		
		Car car = (Car) ctx.getBean("car1");
		System.out.println(car);
		
		Car car2 = (Car) ctx.getBean("car2");
		System.out.println(car2);
	}

}