这个是UserMapper:
这样子写是正确的,程序可以正常运行:
如下,会提示没有bean:
错误信息:
org.springframework.beans.factory.NoSuchBeanDefinitionException:
No qualifying bean of type [dao.UserMapper] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}