Spring Mvc 3.1 之后如何配置messageConverters

是一种简写形式，完全可以手动配置替代这种简写形式，简写形式可以让初学都快速应用默认配置方案。 会自动注册DefaultAnnotationHandlerMapping与AnnotationMethodHandlerAdapter 两个bean,是spring MVC为@Controllers分发请求所必须的。

这句话我在很多帖子都看到过，我自己的项目本身使用的Spring MVC 3.2，实际上在3.1之后，注册的类发生了变化

Spring Framework 3.1 introduces a new set of support classes for processing requests with annotated controllers:

• RequestMappingHandlerMapping

• RequestMappingHandlerAdapter

• ExceptionHandlerExceptionResolver

These classes are a replacement for the existing:

• DefaultAnnotationHandlerMapping

• AnnotationMethodHandlerAdapter

• AnnotationMethodHandlerExceptionResolver

The above registers a RequestMappingHandlerMapping, a RequestMappingHandlerAdapter, and an ExceptionHandlerExceptionResolver (among others) in support of processing requests with annotated controller methods using annotations such as @RequestMapping , @ExceptionHandler, and others.

It also enables the following:

1. Spring 3 style type conversion through a ConversionService instance in addition to the JavaBeans PropertyEditors used for Data Binding.

2. Support for formatting Number fields using the @NumberFormat annotation through the ConversionService.

3. Support for formatting Date, Calendar, Long, and Joda Time fields using the @DateTimeFormat annotation.

4. Support for validating @Controller inputs with @Valid, if a JSR-303 Provider is present on the classpath.

5. HttpMessageConverter support for @RequestBody method parameters and @ResponseBody method return values from @RequestMapping or @ExceptionHandler methods.

   This is the complete list of HttpMessageConverters set up by mvc:annotation-driven:

   • ByteArrayHttpMessageConverter converts byte arrays.

   • StringHttpMessageConverter converts strings.

   • ResourceHttpMessageConverter converts to/from org.springframework.core.io.Resource for all media types.

   • SourceHttpMessageConverter converts to/from a javax.xml.transform.Source.

   • FormHttpMessageConverter converts form data to/from a MultiValueMap.

   • Jaxb2RootElementHttpMessageConverter converts Java objects to/from XML — added if JAXB2 is present on the classpath.

   • MappingJackson2HttpMessageConverter (or MappingJacksonHttpMessageConverter) converts to/from JSON — added if Jackson 2 (or Jackson) is present on the classpath.

   • AtomFeedHttpMessageConverter converts Atom feeds — added if Rome is present on the classpath.

   • RssChannelHttpMessageConverter converts RSS feeds — added if Rome is present on the classpath.

这是摘取的官方文档，可以看出，注册的类已经变成了 RequestMappingHandlerMapping和   RequestMappingHandlerAdapter。

我之前在不知道的时候，使用AnnotationMethodHandlerAdapter 进行配置，结果在有存在的情况下，我自己配置的AnnotationMethodHandlerAdapter 怎么都不起作用，于是去掉了标签，手动注册了AnnotationMethodHandlerAdapter ，和DefaultAnnotationHandlerMapping。结果引发了其他问题，比如文件无法上传的问题。

阅读文档发现Spring提供了基于自定义messageConverters的方法，如下所示：

下面展示我自己的配置

	
	
		
	

	
		
			
			
			
		
	

	
		
		
			
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