SpringMVC 控制器@ResponseBody返回JSON乱码问题

Spring4的版本，在mvc配置文件中<mvc:annotation-driven />位置前增加配置：

<!-- 用于使用@ResponseBody后返回中文避免乱码 --> 
     <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter" >  
        <property name="messageConverters">  
            <list>  
                <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter" />  
                <bean class="org.springframework.http.converter.StringHttpMessageConverter">  
                    <property name="supportedMediaTypes">  
                        <list>  
                            <value>text/plain;charset=utf-8</value>  
                            <value>text/html;charset=UTF-8</value>  
                        </list>  
                    </property>  
                </bean>  
            </list>  
        </property>  
    </bean> 

Spring3的版本，<mvc:annotation-driven >标签需要增加以下配置：

<!-- SpringMVC注解驱动 -->  
<mvc:annotation-driven>  
    <mvc:message-converters>  
        <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"/>  
        <bean class="org.springframework.http.converter.StringHttpMessageConverter">  
            <property name="supportedMediaTypes">  
                <list>  
                    <value>text/plain;charset=utf-8</value>  
                    <value>text/html;charset=UTF-8</value>  
                </list>  
            </property>  
        </bean>  
    </mvc:message-converters>  
</mvc:annotation-driven>