使用reflections获取一个接口A的实现类
Reflections reflections reflections = new Reflections(A.class);
Set<Class<? extends A>> subTypes
= reflections.getSubTypesOf(A.class);
Reflections reflections reflections = new Reflections(A.class);
Set<Class<? extends A>> subTypes
= reflections.getSubTypesOf(A.class);