1、在书写Springboot练习的时候报错，检查mybatis的配置文件并未发现错误，采用的是springoot+mybatis
配置文件：已经配置了接口的实现
在Controller中也已经注入了studentdao
2、解决方案
在启动类中添加注解，扫描配置文件
测试结果：无报错
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