//创建Animal接口
public interface Animal{
    String getType();//此方法可以免去工厂模式需要的策略判断
    void eat();
}

//创建Cat类实现Animal接口并使用@Component注解
@Component
public class Cat implements Animal{
    @Override
    public String getType() {
        return "猫";
    }

    @Override
    public void eat() {
        System.out.println("吃耗子");
    }
}

//创建Dog类实现Animal接口并使用@Component注解
@Component
public class Dog implements Animal{
    @Override
    public String getType() {
        return "狗";
    }

    @Override
    public void eat() {
        System.out.println("吃骨头");
    }
}

//AnimalTest测试
public static class AnimalTest implements ApplicationContextAware{
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        Collection values = applicationContext.getBeansOfType(Animal.class).values();
        //调用每个子类的方法
        values.forEach(c->{
            c.eat();
        });
    }
}

//AnimalFactory工厂通过传入的参数获取对应的接口实现类
@Component
public static class AnimalFactory implements ApplicationContextAware {
    private static Map animalMap;
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        animalMap = applicationContext.getBeansOfType(Animal.class).values().stream().collect(Collectors.toMap(Animal::getType, c -> c));
    }

    public static Animal getInstance(String type) {
        return animalMap.get(type);
    }
}

//工厂测试类
@Component
public static class AnimalFactoryTest {
    //@PostConstruct注解作用是容器初始化完成后自动执行此方法
    @PostConstruct
    public void test(){
        Animal animal = AnimalFactory.getInstance("猫");
        animal.eat();//吃耗子
    }
}