问题如下：
接口也作为匹配的bean?
有点迷惑了。。。。。。。
经过在网上找资料，发现和@MapperScan这个注解有关系，具体源码不止。但是这个注解会扫描路径下的所有类。
去掉这个注解就可以正常使用了；至于具体原因。未知待查。
expected single matching bean but found 2: menusServiceImpl,IMenusService
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