Spring学习笔记九--静态工厂方法和实例工厂方法

<?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"> 
<!--
静态工厂方法配置bean实例
class工厂方法全类名
method静态工厂方法的名字
constructor-arg传入工厂方法参数
-->
<bean id="car1" class="factory.StaticCarFactory" factory-method="getCar">
<constructor-arg value="audi"/>
</bean>

<!-- 配置实例工厂实例 -->
<bean id="carFactory" class="factory.InstancdCarFactory"></bean>

<!-- 通过实例工厂方法配置bean-->
<bean id="car2" factory-bean="carFactory" factory-method="getCar">
<constructor-arg value="benz"/>
</bean>
</beans>

package factory;

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

/**
* 静态工厂方法
*/
public class StaticCarFactory {
private static Map<String, Car> cars = new HashMap<>();

static {
cars.put("audi", new Car("audi", 300000));
cars.put("benz", new Car("benz", 500000));
}

public static Car getCar(String name) {
return cars.get(name);
}
}

package factory;

/**
* 实例工厂方法，先需要创建工厂本身，再调用工厂的实例方法
*/

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

public class InstancdCarFactory {
private Map<String, Car> cars = null;

public InstancdCarFactory() {
cars = new HashMap<>();
cars.put("audi", new Car("audi", 10000));
cars.put("benz", new Car("benz", 20000));
}

public Car getCar(String brand) {
return cars.get(brand);
}
}

package factory;

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

public class Main {
public static void main(String[] args) {
App
7fe0
licationContext ctx = new ClassPathXmlApplicationContext("factory//factory.xml");
Car car1 = (Car)ctx.getBean("car1");
System.out.println(car1);

Car car2 = (Car)ctx.getBean("car2");
System.out.println(car2);
}
}

package factory;

public class Car {
private String brand;
private double price;

public Car() {
System.out.println("this is car constructor.");
}

public Car(String brand, double price) {
this.brand = brand;
this.price = price;
}

public String getBrand() {
return brand;
}

public double getPrice() {
return price;
}

public void setPrice(double price) {
this.price = price;
}

public void setBrand(String brand) {
System.out.println("setting brand ...");
this.brand = brand;
}

public void init() {
System.out.println("init ...");
}

public void destory() {
System.out.println("destory...");
}

@Override
public String toString() {
return "Car{" +
"brand='" + brand + '\'' +
", price=" + price +
'}';
}
}