<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/schema/beans"
xmlns:mvc="http://www.springframework/schema/mvc"
xmlns:xsi="http://www.w3/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework/schema/beans
http://www.springframework/schema/beans/spring-beans.xsd
http://www.springframework/schema/mvc
http://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 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.
-
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="http://www.springframework/schema/beans"
xmlns:xsi="http://www.w3/2001/XMLSchema-instance" xmlns:aop="http://www.springframework/schema/aop"
xmlns:context="http://www.springframework/schema/context" xmlns:tx="http://www.springframework/schema/tx"
xmlns:jdbc="http://www.springframework/schema/jdbc" xmlns:mvc="http://www.springframework/schema/mvc"
xmlns:util="http://www.springframework/schema/util"
xsi:schemaLocation="http://www.springframework/schema/beans
http://www.springframework/schema/beans/spring-beans.xsd
http://www.springframework/schema/tx
http://www.springframework/schema/tx/spring-tx.xsd
http://www.springframework/schema/context
http://www.springframework/schema/context/spring-context.xsd
http://www.springframework/schema/aop
http://www.springframework/schema/aop/spring-aop.xsd
http://www.springframework/schema/jdbc
http://www.springframework/schema/jdbc/spring-jdbc-3.2.xsd
http://www.springframework/schema/util
http://www.springframework/schema/util/spring-util-3.2.xsd
http://www.springframework/schema/mvc
http://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>
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