spring一个接口2种实现的类注入

@Resource(name="spring里面定义的id名称")
ICount countA;

// or

@Autowired
@Qualifier("spring里面定义的id名称")
ICount countA;

参考:
https://www.cnblogs.com/think-in-java/p/5474740.html
https://www.cnblogs.com/linjiaxin/p/5897749.html