Spring MVC返回的json如何去除根节点名称

<property name="defaultViews">
            <list>
                <bean class="org.springframework.web.servlet.view.json.MappingJackson2JsonView">
                </bean>
            </list>
        </property>

{"commonAjaxResponse":{"code":1,"errorCode":null,"errorMessage":null,"data":{"key":"123"}}}

<property name="defaultViews">
            <list>
                <bean
                    class="org.springframework.web.servlet.view.json.MappingJackson2JsonView">
                    <property name="extractValueFromSingleKeyModel" value="true" />
                </bean>
            </list>
        </property>

{"code":1,"errorCode":null,"errorMessage":null,"data":{"key":"123"}}