Car類
public class Car {
private String brand;
private double price;
set和get方法....
public Car(String brand, double price) {
super();
this.brand = brand;
this.price = price;
}
@Override
public String toString() {
return "Car [brand=" + brand + ", price=" + price + "]";
}
}
//實(shí)例工廠的方法，即先需要?jiǎng)?chuàng)建工廠本身，在調(diào)用工廠的實(shí)例方法來返回bean的實(shí)例
public class InstanceCarFactory {
private Map<String, Car> cars=null;
public InstanceCarFactory(){
cars=new HashMap<String, Car>();
cars.put("audi", new Car("audi", 30000));
cars.put("ford", new Car("ford", 400000));
}
public Car getCar(String brand){
return cars.get(brand);
}
}
//自定義的FactoryBean需要自定義FactoryBean的實(shí)現(xiàn)
public class CarFcatoryBean implements FactoryBean<Car> {
private String brand;
public String getBrand() {
return brand;
}
public void setBrand(String brand) {
this.brand = brand;
}
//返回bean的對象
@Override
public Car getObject() throws Exception {
return new Car("BMN",500000);
}
//返回bean的類型
@Override
public Class<?> getObjectType() {
return Car.class;
}
@Override
public boolean isSingleton() {
return true;
}
}
xml配置
<!-- 通過靜態(tài)工廠方法來配置bean,注意不是配置靜態(tài)工廠方法實(shí)例，而是配置bean實(shí)例 -->
<!--
class 屬性：指向靜態(tài)工廠方法的全類名
factory-method ： 指向靜態(tài)工廠方法的名字
constructor-arg ：如果工廠方法需要傳入?yún)?shù)，則使用constructor-arg來配置參數(shù)。
-->
<bean id="car1" class="com.wzq.spring.beans.factory.StaticCarFactory"
factory-method="getCars">
<constructor-arg value="audi"></constructor-arg>
</bean>
<!-- 通過實(shí)例工廠方法來配置bean -->
<!--
class 屬性：指向?qū)嵗S方法的bean
factory-method ： 指向靜態(tài)工廠方法的名字
constructor-arg ：如果工廠方法需要傳入?yún)?shù)，則使用constructor-arg來配置參數(shù)。
-->
<bean id="carFactory" class="com.wzq.spring.beans.factory.InstanceCarFactory"></bean>
<!-- 通過實(shí)例 工廠方法來配置bean -->
<bean id="car2" factory-bean="carFactory" factory-method="getCar">
<constructor-arg value="ford"></constructor-arg>
</bean>
Main方法
public class Main {
public static void main(String[] args) {
ApplicationContext ctx = new ClassPathXmlApplicationContext(
"beans-factory.xml");
Car car1 = (Car) ctx.getBean("car1");
System.out.println(car1);
Car car2 = (Car) ctx.getBean("car2");
System.out.println(car2);
}
}
