SpringBoot加这个注解@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})
会 关闭特定的自动配置，导致mapper文件不能注入系统，会报下面的错误信息：
Description:
Field userPOMapper in com.project.manage.service.impl.LoginServiceImpl required a bean of type 'com.project.manage.mapper.UserPOMapper' that could not be found.
Action:
Consider defining a bean of type 'com.project.manage.mapper.UserPOMapper' in your configuration.