解决：MapperScan
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springcloud 项目搭建遇到的问题及解决-Field restTemplate in com.cloud.ribbon_consumer.project.service.xxxService required a bean of type 'org.springframework.web.client.RestTemplate' that could not be found.
2. springboot启动报错：Field userMapper in com.service.UserService required a bean of type 'com.dao.UserMapper' that could not be found.
Field adminMapper in com.course.service.impl.AdminServiceImpl required a bean of type 'com.course.mapper.AdminMapper' that could not be found
Java报错: A component required a bean of type 'com.sirifeng.testmybatis.mapper.BookMapper' that could not be found.
SpringCloud报错： "Field discoveryClient in com.controller.DcController required a bean of type 'com.netflix.discovery.DiscoveryClient' that could not be found."
Description: Field ud in com.yjj.service.impl.UserServiceImpl required a bean of type 'com.yjj.dao.UserDao' that could not be found. Action: Consider defining a bean of type 'com.yjj.dao.UserDao'
Field userService in com.wuji.controller.UserController required a bean of type 'com.wuji.service.UserService' that could not be found
Field client in com.rachel.web.ConsumerController required a bean of type 'org.springframework.cloud.netflix.ribbon.RibbonLoadBalancerClient' that could not be found.
springboot的Web项目编译运行时提示错误：Field userService in com.cetc.UserManger.controller.UserController required a bean of type 'com.cetc.UserManger.service.UserService' that could not be found.
Field xxxMapper in xxxxxxx required a bean of type 'xxxxMapper'that could not be found.