研究SpringMvc 3.2的默认干了什么

如果不配置其他参数，大致相当于以下的配置文件（参考自org.springframework.web.servlet.config.AnnotationDrivenBeanDefinitionParser）

<!-- 配置路径扩展名映射的媒体类型 -->
	<bean name="pathExtensionContentNegotiationStrategy"
		class="org.springframework.web.accept.PathExtensionContentNegotiationStrategy">
		<constructor-arg>
			<props>
				<!-- if romePresent -->
				<prop key="atom">application/atom+xml</prop>
				<prop key="rss">application/rss+xml</prop>
				<!-- endif -->
				<!-- if jackson2Present || jacksonPresent -->
				<prop key="json">application/json</prop>
				<!-- endif -->
				<!-- if jaxb2Present -->
				<prop key="xml">application/xml</prop>
				<!-- endif -->
			</props>
		</constructor-arg>
	</bean>

	<!-- 配置映射媒体类型的策略 -->
	<bean name="mvcContentNegotiationManager"
		class="org.springframework.web.accept.ContentNegotiationManager">
		<constructor-arg>
			<list>
				<ref bean="pathExtensionContentNegotiationStrategy" />
			</list>
		</constructor-arg>
	</bean>

	<!-- 配置方法级别的@RequestMapping处理器 -->
	<bean name="requestMappingHandlerMapping"
		class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping">
		<property name="order" value="0" />
		<property name="contentNegotiationManager" ref="mvcContentNegotiationManager" />
	</bean>

	<!-- 配置数据转换服务，默认使用格式化数据转换服务，可以对日期和数字进行格式化 -->
	<bean name="conversionService"
		class="org.springframework.format.support.DefaultFormattingConversionService">
		<constructor-arg index="0">
			<null></null>
		</constructor-arg>
		<constructor-arg index="1">
			<value>true</value>
		</constructor-arg>
	</bean>

	<bean name="validator"
		class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean"></bean>

	<!-- 配置数据绑定，通过转换服务实现绑定，如果包含jsr303实现还将进行校验 -->
	<bean name="webBindingInitializer"
		class="org.springframework.web.bind.support.ConfigurableWebBindingInitializer">
		<property name="conversionService" ref="conversionService" />
		<!-- if jsr303Present -->
		<property name="validator" ref="validator" />
		<!-- endif -->
	</bean>

	<bean name="byteArrayHttpMessageConverter"
		class="org.springframework.http.converter.ByteArrayHttpMessageConverter"></bean>
	<bean name="stringHttpMessageConverter"
		class="org.springframework.http.converter.StringHttpMessageConverter">
		<property name="writeAcceptCharset" value="false" />
	</bean>
	<bean name="resourceHttpMessageConverter"
		class="org.springframework.http.converter.ResourceHttpMessageConverter"></bean>
	<bean name="sourceHttpMessageConverter"
		class="org.springframework.http.converter.xml.SourceHttpMessageConverter"></bean>
	<bean name="allEncompassingFormHttpMessageConverter"
		class="org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter"></bean>
	<bean name="atomFeedHttpMessageConverter"
		class="org.springframework.http.converter.feed.AtomFeedHttpMessageConverter"></bean>
	<bean name="rssChannelHttpMessageConverter"
		class="org.springframework.http.converter.feed.RssChannelHttpMessageConverter"></bean>
	<bean name="jaxb2RootElementHttpMessageConverter"
		class="org.springframework.http.converter.xml.Jaxb2RootElementHttpMessageConverter"></bean>
	<bean name="mappingJackson2HttpMessageConverter"
		class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"></bean>
	<bean name="mappingJacksonHttpMessageConverter"
		class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"></bean>

	<!-- 配置@RequestBody，@ResponseBody注解可用的转换器 -->
	<util:list id="messageConverters"
		list-class="org.springframework.beans.factory.support.ManagedList.ManagedList">
		<ref bean="byteArrayHttpMessageConverter" />
		<ref bean="stringHttpMessageConverter" />
		<ref bean="resourceHttpMessageConverter" />
		<ref bean="sourceHttpMessageConverter" />
		<ref bean="allEncompassingFormHttpMessageConverter" />
		<!-- if romePresent -->
		<ref bean="atomFeedHttpMessageConverter" />
		<ref bean="rssChannelHttpMessageConverter" />
		<!-- endif -->
		<!-- if jaxb2Present -->
		<ref bean="jaxb2RootElementHttpMessageConverter" />
		<!-- endif -->
		<!-- if jackson2Present -->
		<ref bean="mappingJackson2HttpMessageConverter" />
		<!-- endif -->
		<!-- if jacksonPresent -->
		<ref bean="mappingJacksonHttpMessageConverter" />
		<!-- endif -->
	</util:list>

	<!-- 将任意类型的Controller适配为Handler -->
	<bean name="requestMappingHandlerAdapter"
		class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
		<property name="contentNegotiationManager" ref="mvcContentNegotiationManager" />
		<property name="webBindingInitializer" ref="webBindingInitializer" />
		<property name="messageConverters" ref="messageConverters" />
	</bean>

	<!-- 这个拦截器暴露转换器服务让spring:bind和spring:eval标签可用 -->
	<bean name="csInterceptor"
		class="org.springframework.web.servlet.handler.ConversionServiceExposingInterceptor">
		<constructor-arg index="0">
			<ref bean="conversionService" />
		</constructor-arg>
	</bean>

	<!-- 现在所有拦截器都必须设定响应的路径映射 -->
	<bean name="mappedCsInterceptor"
		class="org.springframework.web.servlet.handler.MappedInterceptor">
		<constructor-arg index="0">
			<null></null>
		</constructor-arg>
		<constructor-arg index="1">
			<ref bean="csInterceptor" />
		</constructor-arg>
	</bean>

	<!-- 使用@ExceptionHandler注解的方法来处理Exception，优先级为0（最高） -->
	<bean name="exceptionHandlerExceptionResolver"
		class="org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver">
		<property name="contentNegotiationManager" ref="mvcContentNegotiationManager" />
		<property name="messageConverters" ref="messageConverters" />
		<property name="order" value="0" />
	</bean>

	<!-- 如果抛出的Exception类带有@ResponseStatus注解，响应返回该注解的Http状态码，优先级为1 -->
	<bean name="responseStatusExceptionResolver"
		class="org.springframework.web.servlet.mvc.annotation.ResponseStatusExceptionResolver">
		<property name="order" value="1" />
	</bean>

	<!-- SpringMvc内部异常处理 -->
	<bean name="defaultExceptionResolver"
		class="org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver">
		<property name="order" value="2" />
	</bean>