SpringMVC 【@ResponseBody】ajax 请求返回乱码

<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
       <property name="messageConverters">
           <list>
               <ref bean="stringHttpMessageConverter" />
           </list>
       </property>
   </bean>
   
<bean id="stringHttpMessageConverter" class="org.springframework.http.converter.StringHttpMessageConverter">
       <property name ="supportedMediaTypes">   
             <list>   
                 <value>text/plain;charset=UTF-8</value>   
             </list>   
       </property> 
</bean>