Spring Mvc 3.1 之后如何配置messageConverters

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Spring Mvc 3.1 之后如何配置messageConverters

<Mvc:annotation-driven /> 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。<mvc:annotation-driven /> 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，<mvc:annotation-driven />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

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="www.springframework/schema/beans" xmlns:mvc="www.springframework/schema/mvc" xmlns:xsi="www.w3/2001/XMLSchema-instance" xsi:schemaLocation=" www.springframework/schema/beans www.springframework/schema/beans/spring-beans.xsd www.springframework/schema/mvc www.springframework/schema/mvc/spring-mvc.xsd"> <mvc:annotation-driven /> </beans>

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:

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

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

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

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

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<String, String>.

• 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<mvc:annotation-driven />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<mvc:annotation-driven />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<mvc:annotation-driven />自定义messageConverters的方法，如下所示：

<mvc:annotation-driven conversion-service="conversionService"> <mvc:message-converters> <bean class="org.example.MyHttpMessageConverter"/> <bean class="org.example.MyOtherHttpMessageConverter"/> </mvc:message-converters> </mvc:annotation-driven>

下面展示我自己的配置

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="www.springframework/schema/beans" xmlns:xsi="www.w3/2001/XMLSchema-instance" xmlns:aop="www.springframework/schema/aop" xmlns:context="www.springframework/schema/context" xmlns:tx="www.springframework/schema/tx" xmlns:jdbc="www.springframework/schema/jdbc" xmlns:mvc="www.springframework/schema/mvc" xmlns:util="www.springframework/schema/util" xsi:schemaLocation="www.springframework/schema/beans www.springframework/schema/beans/spring-beans.xsd www.springframework/schema/tx www.springframework/schema/tx/spring-tx.xsd www.springframework/schema/context www.springframework/schema/context/spring-context.xsd www.springframework/schema/aop www.springframework/schema/aop/spring-aop.xsd www.springframework/schema/jdbc www.springframework/schema/jdbc/spring-jdbc-3.2.xsd www.springframework/schema/util www.springframework/schema/util/spring-util-3.2.xsd www.springframework/schema/mvc www.springframework/schema/mvc/spring-mvc-3.2.xsd"> <!-- spring自动扫描注解的组件 --> <context:component-scan base-package="cn.xx.xx" use-default-filters="false"> <context:include-filter expression="org.springframework.stereotype.Controller" type="annotation" /> </context:component-scan> <mvc:annotation-driven> <mvc:message-converters> <ref bean="stringHttpMessageConverter" /> <ref bean="fastJsonHttpMessageConverter" /> <ref bean="marshallingHttpMessageConverter" /> </mvc:message-converters> </mvc:annotation-driven> <bean id="stringHttpMessageConverter" class="org.springframework.http.converter.StringHttpMessageConverter"> <constructor-arg value="UTF-8" index="0"></constructor-arg><!-- 避免出现乱码 --> <property name="supportedMediaTypes"> <list> <value>text/plain;charset=UTF-8</value> </list> </property> </bean> <bean id="fastJsonHttpMessageConverter" class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter"> <property name="supportedMediaTypes"> <list> <value>application/json;charset=UTF-8</value> <value>text/html;charset=UTF-8</value><!-- 避免IE出现下载JSON文件的情况 --> </list> </property> <property name="features"> <util:list> <!-- <value>WriteMapNullValue</value> --> <value>QuoteFieldNames</value> <value>WriteDateUseDateFormat</value> </util:list> </property> </bean> <bean id="marshallingHttpMessageConverter" class="org.springframework.http.converter.xml.MarshallingHttpMessageConverter"> <property name="marshaller" ref="castorMarshaller" /> <property name="unmarshaller" ref="castorMarshaller" /> <property name="supportedMediaTypes"> <list> <value>text/xml;charset=UTF-8</value> <value>application/xml;charset=UTF-8</value> </list> </property> </bean> <!-- 返回类型定义 --> <util:list id="messageConverters"> <ref bean="stringHttpMessageConverter" /> <ref bean="fastJsonHttpMessageConverter" /> <ref bean="marshallingHttpMessageConverter" /> </util:list> <bean id="castorMarshaller" class="org.springframework.oxm.castor.CastorMarshaller" /> <!-- AOP自动注解功能 --> <aop:aspectj-autoproxy /> <!-- 不进行拦截的 --> <mvc:resources location="/" mapping="/**/*.html" order="0" /> <mvc:resources location="/images/" mapping="/images/**" /> <mvc:resources location="/img/" mapping="/img/**" /> <mvc:resources location="/download/" mapping="/download/**" /> <mvc:resources location="/js/" mapping="/js/**" /> <mvc:resources location="/css/" mapping="/css/**" /> <mvc:resources location="/plugin/" mapping="/plugin/**" /> <mvc:resources location="/WEB-INF/pages/" mapping="/pages/**" /> <bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource"> <property name="basename" value="messages"></property> </bean> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/pages/" /> <property name="suffix" value=".jsp" /> </bean> <!-- 支持上传文件 --> <bean id="multipartResolver" class="org.springframework.web.multipartmons.CommonsMultipartResolver" /> <!-- restTemplate --> <bean id="restTemplate" class="org.springframework.web.client.RestTemplate"> <property name="messageConverters" ref="messageConverters"> </property> </bean> </beans>

本文标签： MVCspringmessageConverters