解决办法：
-
将项目的启动类放在根目录下，不然无法扫描其他文件，因为springboot默认只扫描项目根目录下的子文件；
-
在service层，如果有接口和实现类，要在接口前添加"@Repository"注解，在实现类前添加"@Service"注解。
当然这个报错可能还有其他原因。
报错：expected at least 1 bean which qualifies as autowire candidate(Spring Bean 无法注入)
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