spring rest json xml

Question

spring contentNegotiationManager的defaultContentType设置成application/json，但是默认却返回xml格式数据，怎么办才能设置默认返回json格式？
配置如下：
<bean id="contentNegotiationManager"
             class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
    <property name="favorPathExtension" value="true" />
    <property name="favorParameter" value="true" />
    <property name="parameterName" value="mediaType" />
    <property name="ignoreAcceptHeader" value="true"/>
    <property name="useJaf" value="false"/>
    <property name="defaultContentType" value="application/json" />
 
    <property name="mediaTypes">
        <map>
            <entry key="json" value="application/json" />
            <entry key="xml" value="application/xml" />
       </map>
    </property>
</bean>

 <bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">  
<property name="contentNegotiationManager" ref="contentNegotiationManager"/>  
<property name="defaultViews">
<list>
<bean class="org.springframework.web.servlet.view.json.MappingJacksonJsonView" />
</list>
</property>
</bean>

Answer 1

schema文件用3.2版本的
<mvc:annotation-driven content-negotiation-manager="contentNegotiationManager"/>
<bean id="contentNegotiationManager"
             class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
    <property name="favorPathExtension" value="true" />
    <property name="favorParameter" value="true" />
    <property name="parameterName" value="mediaType" />
    <property name="ignoreAcceptHeader" value="true"/>
    <property name="useJaf" value="false"/>
    <property name="defaultContentType" value="application/json" />
 
    <property name="mediaTypes">
        <map>
            <entry key="json" value="application/json" />
            <entry key="xml" value="application/xml" />
       </map>
    </property>
</bean>

 <bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">  
<property name="contentNegotiationManager" ref="contentNegotiationManager"/>  
<property name="defaultViews">
<list>
 <!-- JSON View -->  
<bean class="org.springframework.web.servlet.view.json.MappingJacksonJsonView" />
<!--  XML view 
    <bean class="org.springframework.web.servlet.view.xml.MarshallingView">  
      <constructor-arg>  
          <bean class="org.springframework.oxm.jaxb.Jaxb2Marshaller">  
             <property name="classesToBeBound">  
              <list>  
                 <value> com.interlib.journalservice.entity.UnionJournalArticle</value>  
                 <value> com.interlib.journalservice.entity.UnionJournalInfo</value>  
                 <value> com.interlib.journalservice.entity.UnionJournalIssueInfo</value>  
              </list>  
             </property>  
          </bean>  
      </constructor-arg>  
    </bean> -->   
</list>
</property>
<property name="viewResolvers">
<list>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" >
<property name="prefix" value="/jsps/"/>
<property name="suffix" value=".jsp"/>
</bean>
</list>
</property>
</bean>