在剛學習SpringMVC框架整合時，你也許會產生疑問為什麼Spring.xml和SpringMVC.xml中都有註解過濾。 <context:component-scan base-package="myproject"> 和<context:component-scan base-package ...
在剛學習SpringMVC框架整合時，你也許會產生疑問為什麼Spring.xml和SpringMVC.xml中都有註解過濾。
<context:component-scan base-package="myproject"> 和<context:component-scan base-package="myproject.controller" />
在這裡有一個比較有意思的問題，初學者也會產生困惑，那麼他究竟有何不同？我思考和查詢很久，話不多說，也實踐做起：
（1）只在applicationContext.xml中配置如下
<context:component-scan base-package="myproject">
啟動不報錯，，但@Controller失效
（2）只在spring-servlet.xml中配置上述配置
Error creating bean with name 'org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping#0' defined in ServletContext resource [/WEB-INF/spring-mvc-...... Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'commonController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private eis.service.ICollegeServer eis.controller.CommonController.collService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [eis.service.ICollegeServer] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}（3）在applicationContext.xml和spring-servlet.xml中都配置過濾<context:component-scan base-package="myproject"> 和<context:component-scan base-package="myproject.controller" />，
不報錯，請求正常，
總結：由此可以分析<context:component-scan base-package="myproject">主要過濾@Controller，同時還查資料瞭解<context:component-scan base-package="myproject.controller" /> 配置項不但啟用了對類包進行掃描以實施註釋驅動 Bean 定義的功能，同時還啟用了註釋驅動自動註入的功能。
