spring-mvc 3.2.0 多视图解析配置实例 ContentNegotiatingViewResolver

一、起因
    从spring 3.1.0升级到spring 3.2.0时，配置文件servlet.xml中出错。

错误信息：

java.lang.String cannot be cast to org.springframework.http.MediaType

错误原因：是spring3.2开始不推荐使用setMediaTypes等直接设置这些数据， 而是通过ContentNegotiationManager（ContentNegotiationManagerFactoryBean），所以采用map标签的方式直接转换会出现异常信息。

二、ContentNegotiatingViewResolver 解释

引用

http://yidwo.iteye.com/blog/1884061

三、配置实例
1. spring 3.1.0

<bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
    	<property name="ignoreAcceptHeader" value="true"/>
		<property name="defaultContentType" value="text/html"/>
		<property name="mediaTypes">
			<map>
				<entry key="json" value="application/json" />
				<entry key="xml" value="application/xml" />
			</map>
		</property>
		<property name="viewResolvers">
			<list>
				<bean class="org.springframework.web.servlet.view.BeanNameViewResolver" />
			    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
			        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
			        <property name="prefix" value="/WEB-INF/pages/"/>
			        <property name="suffix" value=".jsp"></property>
			    </bean>
			</list>
		</property>
		<property name="defaultViews">
			<list>
				<bean class="org.springframework.web.servlet.view.json.MappingJacksonJsonView" />
				<bean class="org.springframework.web.servlet.view.xml.MarshallingView" >
					<property name="marshaller">
						<bean class="org.springframework.oxm.xstream.XStreamMarshaller"/>
					</property>
				</bean>
			</list>
		</property>
    </bean>

2. spring 3.1.0/3.2.0

<bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
    	<property name="ignoreAcceptHeader" value="true"/>
		<property name="defaultContentType" value="text/html"/>
		<property name="mediaTypes">
			<value>
				json=application/json,
				xml=application/xml
			</value>
		</property>
		<property name="viewResolvers">
			<list>
				<bean class="org.springframework.web.servlet.view.BeanNameViewResolver" />
			    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
			        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
			        <property name="prefix" value="/WEB-INF/pages/"/>
			        <property name="suffix" value=".jsp"></property>
			    </bean>
			</list>
		</property>
		<property name="defaultViews">
			<list>
				<bean class="org.springframework.web.servlet.view.json.MappingJacksonJsonView" />
				<bean class="org.springframework.web.servlet.view.xml.MarshallingView" >
					<property name="marshaller">
						<bean class="org.springframework.oxm.xstream.XStreamMarshaller"/>
					</property>
				</bean>
			</list>
		</property>
    </bean>

3. spring 3.2.0

<bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
    	<property name="ignoreAcceptHeader" value="true"/>
		<property name="defaultContentType" value="text/html"/>
		<property name="contentNegotiationManager">
            <bean class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
                <property name="ignoreAcceptHeader" value="true"/>
                <property name="defaultContentType" value="text/html"/>
                <property name="mediaTypes">
                    <map>
						<entry key="json" value="application/json" />
						<entry key="xml" value="application/xml" />
                    </map>
                </property>
            </bean>
        </property>
		<property name="viewResolvers">
			<list>
				<bean class="org.springframework.web.servlet.view.BeanNameViewResolver" />
			    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
			        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
			        <property name="prefix" value="/WEB-INF/pages/"/>
			        <property name="suffix" value=".jsp"></property>
			    </bean>
			</list>
		</property>
		<property name="defaultViews">
			<list>
				<bean class="org.springframework.web.servlet.view.json.MappingJacksonJsonView" />
				<bean class="org.springframework.web.servlet.view.xml.MarshallingView" >
					<property name="marshaller">
						<bean class="org.springframework.oxm.xstream.XStreamMarshaller"/>
					</property>
				</bean>
			</list>
		</property>
    </bean>

4. spring 3.2.x (推荐)

<bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
    	<property name="ignoreAcceptHeader" value="true"/>
		<property name="defaultContentType" value="text/html"/>
		<property name="contentNegotiationManager">
            <bean class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
                <property name="ignoreAcceptHeader" value="true"/>
                <property name="defaultContentType" value="text/html"/>
                <property name="mediaTypes">
                	<props>
                		<prop key="json">application/json</prop>
                		<prop key="xml">application/xml</prop>
                	</props>
                </property>
            </bean>
        </property>
		<property name="viewResolvers">
			<list>
				<bean class="org.springframework.web.servlet.view.BeanNameViewResolver" />
			    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
			        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
			        <property name="prefix" value="/WEB-INF/pages/"/>
			        <property name="suffix" value=".jsp"></property>
			    </bean>
			</list>
		</property>
		<property name="defaultViews">
			<list>
				<bean class="org.springframework.web.servlet.view.json.MappingJacksonJsonView" />
				<bean class="org.springframework.web.servlet.view.xml.MarshallingView" >
					<property name="marshaller">
						<bean class="org.springframework.oxm.xstream.XStreamMarshaller"/>
					</property>
				</bean>
			</list>
		</property>
    </bean>