spring3.1 @ResponseBody 返回乱码

<beans:bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">        <beans:property name="messageConverters">            <beans:list>                <beans:bean class="org.springframework.http.converter.StringHttpMessageConverter">                    <beans:property name="supportedMediaTypes">                        <beans:list>                            <beans:value>text/plain;charset=UTF-8</beans:value>                        </beans:list>                    </beans:property>                </beans:bean>            </beans:list>        </beans:property>    </beans:bean>