面向接口编程，把Service层定义为接口，然后用另外一个类去实现这个接口，使用spring boot启动时报错
项目结构：
controller层注入如下
@Autowired
private UserServiceImpl userService;
错误详情
Error starting ApplicationContext.
To display the auto-
configuration report re-run your application
with 'debug' enabled.
2017-
09-
30 10:
06:
33.611 ERROR
7736
***************************
APPLICATION FAILED
TO START
***************************
Description:
Field userService
in com.adtec.vuespringboot.controller.UserController required a bean
of type 'com.adtec.vuespringboot.service.impl.UserServiceImpl' that could
not be found.
Action:
Consider defining a bean
of type 'com.adtec.vuespringboot.service.impl.UserServiceImpl'
in your
configuration.
这可能是因为spring boot默认找的是service层的类，而Service里面并没有UserServiceImpl这个类
解决方案：
在UserServiceImpl类上添加注解@Service
@Service
public class UserServiceImpl implements UserService {
