<!-- spring mvc中@ResponseBody对象转json --> <bean class ="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" >      <property name="messageConverters">    <list>     <ref bean="mappingJacksonHttpMessageConverter" /><!-- json转换器  -->   </list>  </property>  </bean>      <bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />