获取一个接口类的所有实现类（基于Spring实现）

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;


@Component
public class MyAppContext implements ApplicationContextAware {


    private static ApplicationContext context = null;

    
    public void setApplicationContext(ApplicationContext context) {
        MyAppContext.setContext(context);

    }


    
    public static ApplicationContext getContext() {

        if (context == null) {

            throw new IllegalStateException("applicaitonContext未注入,请在applicationContext.xml中定义AppContext");
        }
        return context;

    }

    
    public static void setContext(ApplicationContext context) {
        MyAppContext.context = context;
    }

    
    public static  T getBean(String name) {
        if (context == null)
            throw new IllegalStateException("applicaitonContext未注入,请在applicationContext.xml中定义AppContext");
        try {
            return (T) context.getBean(name);

        } catch (BeansException e) {
            e.printStackTrace();
        }

        return (T) null;

    }

}

Animal为一个接口类，animalMap中获取到IOC容器中实现了Animal接口的所有类对象；所有的实现了必须机上@Component注解，交给IOC管理

@Component
public class Test {
    public Map getAll() {
        Map animalMap =  MyAppContext.getContext().getBeansOfType(Animal.class);
        return animalMap;
    }
}