网址：http://blog.csdn.net/jiesa/article/details/54912534

<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

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在CODE上查看代码片

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. <mvc:annotation-driven />

11. </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.

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：

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在CODE上查看代码片

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>

下面展示我自己的配置

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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">

22. <context:component-scan base-package="cn.xx.xx"

23. use-default-filters="false">

24. <context:include-filter expression="org.springframework.stereotype.Controller"

25. type="annotation" />

26. </context:component-scan>

27. <mvc:annotation-driven>

28. <mvc:message-converters>

29. <ref bean="stringHttpMessageConverter" />

30. <ref bean="fastJsonHttpMessageConverter" />

31. <ref bean="marshallingHttpMessageConverter" />

32. </mvc:message-converters>

33. </mvc:annotation-driven>

34. <bean id="stringHttpMessageConverter"

35. class="org.springframework.http.converter.StringHttpMessageConverter">

37. <property name="supportedMediaTypes">

38. <list>

39. <value>text/plain;charset=UTF-8</value>

40. </list>

41. </property>

42. </bean>

43. <bean id="fastJsonHttpMessageConverter"

44. class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">

45. <property name="supportedMediaTypes">

46. <list>

47. <value>application/json;charset=UTF-8</value>

48. <value>text/html;charset=UTF-8</value>

49. </list>

50. </property>

51. <property name="features">

52. <util:list>

54. <value>QuoteFieldNames</value>

55. <value>WriteDateUseDateFormat</value>

56. </util:list>

57. </property>

58. </bean>

59. <bean id="marshallingHttpMessageConverter"

60. class="org.springframework.http.converter.xml.MarshallingHttpMessageConverter">

61. <property name="marshaller" ref="castorMarshaller" />

62. <property name="unmarshaller" ref="castorMarshaller" />

63. <property name="supportedMediaTypes">

64. <list>

65. <value>text/xml;charset=UTF-8</value>

66. <value>application/xml;charset=UTF-8</value>

67. </list>

68. </property>

69. </bean>

71. <util:list id="messageConverters">

72. <ref bean="stringHttpMessageConverter" />

73. <ref bean="fastJsonHttpMessageConverter" />

74. <ref bean="marshallingHttpMessageConverter" />

75. </util:list>

76. <bean id="castorMarshaller" class="org.springframework.oxm.castor.CastorMarshaller" />

78. <aop:aspectj-autoproxy />

80. <mvc:resources location="/" mapping="/*/.html" order="0" />

81. <mvc:resources location="/images/" mapping="/images/**" />

82. <mvc:resources location="/img/" mapping="/img/**" />

83. <mvc:resources location="/download/" mapping="/download/**" />

84. <mvc:resources location="/js/" mapping="/js/**" />

85. <mvc:resources location="/css/" mapping="/css/**" />

86. <mvc:resources location="/plugin/" mapping="/plugin/**" />

87. <mvc:resources location="/WEB-INF/pages/" mapping="/pages/**" />

88. <bean id="messageSource"

89. class="org.springframework.context.support.ResourceBundleMessageSource">

90. <property name="basename" value="messages"></property>

91. </bean>

92. <bean

93. class="org.springframework.web.servlet.view.InternalResourceViewResolver">

94. <property name="prefix" value="/WEB-INF/pages/" />

95. <property name="suffix" value=".jsp" />

96. </bean>

98. <bean id="multipartResolver"

99. class="org.springframework.web.multipart.commons.CommonsMultipartResolver" />

101. <bean id="restTemplate" class="org.springframework.web.client.RestTemplate">

102. <property name="messageConverters" ref="messageConverters">

103. </property>

104. </bean>

105. </beans>

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