mvc:annotation-driven与annotation-config区别

mvc:annotation-driven is a tag added in Spring 3.0 which does the following:

• Configures the Spring 3 Type ConversionService (alternative to PropertyEditors)
• Adds support for formatting Number fields with @NumberFormat
• Adds support for formatting Date, Calendar, and Joda Time fields with @DateTimeFormat, if Joda Time is on the classpath
• Adds support for validating @Controller inputs with @Valid, if a JSR-303 Provider is on the classpath
• Adds support for support for reading and writing XML, if JAXB is on the classpath (HTTP message conversion with @RequestBody/@ResponseBody)
• Adds support for reading and writing JSON, if Jackson is o n the classpath (along the same lines as #5)

context:annotation-config Looks for annotations on beans in the same application context it is defined and declares support for all the general annotations like @Autowired, @Resource, @Required, @PostConstruct etc etc.

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<mvc:annotation-driven /> declares explicit support for annotation-driven MVC controllers (i.e. @RequestMapping, @Controller, although support for those is the default behaviour), as well as adding support for declarative validation via @Valid and message body marshalling with @RequestBody/ResponseBody.

个人理解就是，mvc:annotation-driven，是给spring-mvc增添了额外可用的注解，如@responseBody 等，并且显示声明了基础注解，如@RequestMapping 等（虽然这些注解是默认的）