配置ssm项目时，提示提示在service层注入出错，出错信息如下：大致的错误信息为：
cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘studentController’: Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘studentServiceImpl’: Unsatisfied dependency expressed through field ‘studentMapper’: No qualifying bean of type [com.csair.student.dao.StudentMapper] found for dependency [com.csair.student.dao.StudentMapper]: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: cancell
