<context:component-scan>
The context:component-scan tag does the same functions as context:annotation-config, plus it scans the packages and marks the stereotype-annotated classes as spring beans. Declaring each bean in the XML files would be unnecessary if the spring configuration file had the context:component-scan element.
Annotation Activation by <context:component-scan>
Essentially, package scanning is used by <context:component-scan> to identify the annotations. It instructs Spring about which packages to search in order to find the components or beans that have been annotated. <context:component-scan> may identify a number of them, including @Component, @Repository, @Service, @Controller, @RestController, and @Configuration.
XML
<context:component-scan base-package="org.w3wiki"> <context:include-filter type="annotation" expression="org.springframework.stereotype.Component"/> <context:include-filter type="annotation" expression="org.springframework.stereotype.Repository"/> <context:include-filter type="annotation" expression="org.springframework.stereotype.Service"/> <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/> <context:include-filter type="annotation" expression="org.springframework.web.bind.annotation.RestController"/> <context:include-filter type="annotation" expression="org.springframework.context.annotation.Configuration"/> </context:component-scan> |
Spring MVC context:annotation-config VS context:component-scan
In this article, we will learn about Spring MVC <context:annotation-config> vs <context:component-scan>. Activating all annotations existing in Java beans that have already been registered either by definition in an application context file or by component scanning is the primary function of annotation-config. The requirement for registration is crucial. The component scan assigns the Spring Bean registration to Java classes annotated with @component, @service, @repository, and other attributes. It can do all the functions that annotation config can.