異常報文：
Field adminDAO in com......service.impl.AdminServiceImpl required a bean of type 'com.....dao.AdminDAO' that could not be found.
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:: Spring Boot :: (v2.1.5.RELEASE)
2019-05-25 23:39:27.645 INFO 31864 --- [ main] com.eszb.SprintbootdemoApplication : Starting SprintbootdemoApplication on DESKTOP-6MD93CN with PID 31864 (D:\java\springboot-project\sprintbootdemo\target\classes started by Mr.Yu in D:\java\springboot-project\sprintbootdemo)
2019-05-25 23:39:27.649 INFO 31864 --- [ main] com.eszb.SprintbootdemoApplication : No active profile set, falling back to default profiles: default
2019-05-25 23:39:28.523 INFO 31864 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2019-05-25 23:39:28.540 INFO 31864 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2019-05-25 23:39:28.540 INFO 31864 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.19]
2019-05-25 23:39:28.639 INFO 31864 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2019-05-25 23:39:28.639 INFO 31864 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 949 ms
2019-05-25 23:39:28.678 WARN 31864 --- [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'adminController': Unsatisfied dependency expressed through field 'adminService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'adminService': Unsatisfied dependency expressed through field 'adminDAO'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.eszb.dao.AdminDAO' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
2019-05-25 23:39:28.681 INFO 31864 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2019-05-25 23:39:28.692 INFO 31864 --- [ main] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-05-25 23:39:28.763 ERROR 31864 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter :
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APPLICATION FAILED TO START
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Description:
Field adminDAO in com.eszb.service.impl.AdminServiceImpl required a bean of type 'com.eszb.dao.AdminDAO' that could not be found.
The injection point has the following annotations:
- @org.springframework.beans.factory.annotation.Autowired(required=true)
Action:
Consider defining a bean of type 'com.eszb.dao.AdminDAO' in your configuration.
Process finished with exit code 1
問題描述：這個異常描述是在service類裏面用到的dao層接口，在注入dao層接口的時候，出現了異常，沒有找到dao層的這個類，這個是由於spring沒有掃到dao層的接口的原因，所以需要在啓動的類上加上掃描dao層的類的註解，如下：
@MapperScan("com.eszb.dao")
此時就ok了
