解決辦法：
-
將項目的啟動類放在根目錄下，不然無法掃描其他文件，因為springboot默認只掃描項目根目錄下的子文件；
-
在service層，如果有接口和實現類，要在接口前添加"@Repository"注解，在實現類前添加"@Service"注解。
當然這個報錯可能還有其他原因。
報錯：expected at least 1 bean which qualifies as autowire candidate(Spring Bean 無法注入)
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