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Spring MVC 3.1 之後如何配置messageConverters

<mvc:annotation-driven /> 是一種簡寫形式，完全可以手動配置替代這種簡寫形式，簡寫形式可以讓初學都快速應用默認配置方案。<mvc:annotation-driven /> 會自動注冊DefaultAnnotationHandlerMapping與AnnotationMethodHandlerAdapter 兩個bean,是spring MVC為@Controllers分發請求所必須的。

這句話我在很多帖子都看到過，我自己的項目本身使用的Spring MVC 3.2，實際上在3.1之後，<mvc:annotation-driven />注冊的類發生了變化

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

  1. <?xml version="1.0" encoding="UTF-8"?> 
  2. <beans xmlns="http://www.springframework.org/schema/beans" 
  3.     xmlns:mvc="http://www.springframework.org/schema/mvc" 
  4.     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  5.     xsi:schemaLocation=" 
  6.         http://www.springframework.org/schema/beans 
  7.         http://www.springframework.org/schema/beans/spring-beans.xsd 
  8.         http://www.springframework.org/schema/mvc 
  9.         http://www.springframework.org/schema/mvc/spring-mvc.xsd"> 
  10.  
  11.     <mvc:annotation-driven /> 
  12.  
  13. </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:

  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<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.

這是摘取的官方文檔，可以看出，注冊的類已經變成了RequestMappingHandlerMapping和 RequestMappingHandlerAdapter。

我之前在不知道的時候，使用AnnotationMethodHandlerAdapter 進行配置，結果在有<mvc:annotation-driven />存在的情況下，我自己配置的AnnotationMethodHandlerAdapter 怎麼都不起作用，於是去掉了<mvc:annotation-driven />標簽，手動注冊了AnnotationMethodHandlerAdapter ，和DefaultAnnotationHandlerMapping。結果引發了其他問題，比如文件無法上傳的問題。

閱讀文檔發現Spring提供了基於<mvc:annotation-driven />自定義messageConverters的方法，如下所示：

  1. <mvc:annotation-driven conversion-service="conversionService"> 
  2.     <mvc:message-converters> 
  3.         <bean class="org.example.MyHttpMessageConverter"/> 
  4.         <bean class="org.example.MyOtherHttpMessageConverter"/> 
  5.     </mvc:message-converters> 
  6. </mvc:annotation-driven>  
<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

  1. <?xml version="1.0" encoding="UTF-8"?> 
  2. <beans xmlns="http://www.springframework.org/schema/beans" 
  3.     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" 
  4.     xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" 
  5.     xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:mvc="http://www.springframework.org/schema/mvc" 
  6.     xmlns:util="http://www.springframework.org/schema/util" 
  7.     xsi:schemaLocation="http://www.springframework.org/schema/beans 
  8.                      http://www.springframework.org/schema/beans/spring-beans.xsd 
  9.                      http://www.springframework.org/schema/tx 
  10.                      http://www.springframework.org/schema/tx/spring-tx.xsd 
  11.                      http://www.springframework.org/schema/context   
  12.                      http://www.springframework.org/schema/context/spring-context.xsd 
  13.                      http://www.springframework.org/schema/aop 
  14.                      http://www.springframework.org/schema/aop/spring-aop.xsd 
  15.                      http://www.springframework.org/schema/jdbc 
  16.                      http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd 
  17.                      http://www.springframework.org/schema/util       
  18.                      http://www.springframework.org/schema/util/spring-util-3.2.xsd 
  19.                      http://www.springframework.org/schema/mvc   
  20.                      http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd"> 
  21.  
  22.     <!-- spring自動掃描注解的組件 --> 
  23.     <context:component-scan base-package="cn.xx.xx" 
  24.         use-default-filters="false"> 
  25.         <context:include-filter expression="org.springframework.stereotype.Controller" 
  26.             type="annotation" /> 
  27.     </context:component-scan> 
  28.  
  29.     <mvc:annotation-driven> 
  30.         <mvc:message-converters> 
  31.             <ref bean="stringHttpMessageConverter" /> 
  32.             <ref bean="fastJsonHttpMessageConverter" /> 
  33.             <ref bean="marshallingHttpMessageConverter" /> 
  34.         </mvc:message-converters> 
  35.     </mvc:annotation-driven> 
  36.  
  37.     <bean id="stringHttpMessageConverter" 
  38.         class="org.springframework.http.converter.StringHttpMessageConverter"> 
  39.         <constructor-arg value="UTF-8" index="0"></constructor-arg><!--  
  40.             避免出現亂碼 --> 
  41.         <property name="supportedMediaTypes"> 
  42.             <list> 
  43.                 <value>text/plain;charset=UTF-8</value> 
  44.             </list> 
  45.         </property> 
  46.     </bean> 
  47.     <bean id="fastJsonHttpMessageConverter" 
  48.         class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter"> 
  49.  
  50.         <property name="supportedMediaTypes"> 
  51.             <list> 
  52.                 <value>application/json;charset=UTF-8</value> 
  53.                 <value>text/html;charset=UTF-8</value><!-- 避免IE出現下載JSON文件的情況 --> 
  54.             </list> 
  55.         </property> 
  56.         <property name="features"> 
  57.             <util:list> 
  58.                 <!-- <value>WriteMapNullValue</value> --> 
  59.                 <value>QuoteFieldNames</value> 
  60.                 <value>WriteDateUseDateFormat</value> 
  61.             </util:list> 
  62.         </property> 
  63.     </bean> 
  64.      
  65.     <bean id="marshallingHttpMessageConverter" 
  66.         class="org.springframework.http.converter.xml.MarshallingHttpMessageConverter"> 
  67.         <property name="marshaller" ref="castorMarshaller" /> 
  68.         <property name="unmarshaller" ref="castorMarshaller" /> 
  69.         <property name="supportedMediaTypes"> 
  70.             <list> 
  71.                 <value>text/xml;charset=UTF-8</value> 
  72.                 <value>application/xml;charset=UTF-8</value> 
  73.             </list> 
  74.         </property> 
  75.     </bean> 
  76.  
  77.     <!-- 返回類型定義 --> 
  78.     <util:list id="messageConverters"> 
  79.         <ref bean="stringHttpMessageConverter" /> 
  80.         <ref bean="fastJsonHttpMessageConverter" /> 
  81.         <ref bean="marshallingHttpMessageConverter" /> 
  82.     </util:list> 
  83.  
  84.     <bean id="castorMarshaller" class="org.springframework.oxm.castor.CastorMarshaller" /> 
  85.  
  86.     <!-- AOP自動注解功能 --> 
  87.     <aop:aspectj-autoproxy /> 
  88.  
  89.     <!-- 不進行攔截的 --> 
  90.     <mvc:resources location="/" mapping="/**/*.html" order="0" /> 
  91.     <mvc:resources location="/images/" mapping="/images/**" /> 
  92.     <mvc:resources location="/img/" mapping="/img/**" /> 
  93.     <mvc:resources location="/download/" mapping="/download/**" /> 
  94.  
  95.     <mvc:resources location="/js/" mapping="/js/**" /> 
  96.     <mvc:resources location="/css/" mapping="/css/**" /> 
  97.     <mvc:resources location="/plugin/" mapping="/plugin/**" /> 
  98.     <mvc:resources location="/WEB-INF/pages/" mapping="/pages/**" /> 
  99.  
  100.     <bean id="messageSource" 
  101.         class="org.springframework.context.support.ResourceBundleMessageSource"> 
  102.         <property name="basename" value="messages"></property> 
  103.     </bean> 
  104.  
  105.     <bean 
  106.         class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 
  107.         <property name="prefix" value="/WEB-INF/pages/" /> 
  108.         <property name="suffix" value=".jsp" /> 
  109.  
  110.     </bean> 
  111.  
  112.     <!-- 支持上傳文件 --> 
  113.     <bean id="multipartResolver" 
  114.         class="org.springframework.web.multipart.commons.CommonsMultipartResolver" /> 
  115.  
  116.     <!-- restTemplate --> 
  117.     <bean id="restTemplate" class="org.springframework.web.client.RestTemplate"> 
  118.         <property name="messageConverters" ref="messageConverters"> 
  119.         </property> 
  120.     </bean> 
  121. </beans> 

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