Spring MVC 3.1 之后如何配置messageConverters
- 作者 firedragonpzy
- 6 九月, 2015
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<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="http://www.springframework.org/schema/beans" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/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 theConversionService
. - 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/fromorg.springframework.core.io.Resource
for all media types.SourceHttpMessageConverter
converts to/from ajavax.xml.transform.Source
.FormHttpMessageConverter
converts form data to/from aMultiValueMap<String, String>
.Jaxb2RootElementHttpMessageConverter
converts Java objects to/from XML — added if JAXB2 is present on the classpath.MappingJackson2HttpMessageConverter
(orMappingJacksonHttpMessageConverter
) 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> </mvc:annotation>
下面展示我自己的配置
< ?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:util="http://www.springframework.org/schema/util" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/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> <mvc:annotation -driven> <mvc:message -converters> <ref bean="stringHttpMessageConverter" /> <ref bean="fastJsonHttpMessageConverter" /> <ref bean="marshallingHttpMessageConverter" /> </mvc:message> </mvc:annotation> <bean id="stringHttpMessageConverter" class="org.springframework.http.converter.StringHttpMessageConverter"> <constructor -arg value="UTF-8" index="0"></constructor><!-- 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>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.multipart.commons.CommonsMultipartResolver" /> <!-- restTemplate --> <bean id="restTemplate" class="org.springframework.web.client.RestTemplate"> <property name="messageConverters" ref="messageConverters"> </property> </bean> </beans>