What has been done behind < mvc:annotation-driven/ >

Spring,xml,@Controller,@Autowired,
@RequestMapping,@Service;

,xml:
     <context:component-scan base-package="..."/>
:
     <mvc:annotation-driven/>
     
??

Java spring spring-mvc java-web

Mar.04,2021

their roles do not coincide.

The function of

context:component-scan is to scan the corresponding base-package, to scan the classes annotated by @ Component , @ Controller , @ Service , @ Repository in the corresponding Bean. These Bean provide the most basic support for Spring MVC to register a Bean, in the context.

< hr >

while < mvc:annotation-driven/ > provides additional support for MVC. Refer to Spring official document , < mvc:annotation-driven/ > the main function is to register HandlerMapping (implemented as DefaultAnnotationHandlerMapping) and HandlerAdapter (implemented as AnnotationMethodHandlerAdapter). These two Bean provide the ability to forward requests for @ Controllers (all controllers). There are other features available for MVC:

Using the Spring 3 Type ConversionService as a simpler and more robust alternative to JavaBeans PropertyEditors
Support for formatting Number fields with @ NumberFormat
Support for formatting Date, Calendar, and Joda Time fields with @ DateTimeFormat, if Joda Time is on the classpath
Support for validating @ Controller inputs with @ Valid, if a JSR-303 Provider is on the classpath
Support for reading and writing XML, if JAXB is on the classpath
Support for reading and writing JSON, if Jackson is on the classpath

Please refer to the official documentation for more details.

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