spring mvc 使用XStream返回xml下划线问题

小弟今天用Spring mvc XStream 返回xml数据，发现给返回的pojo对象修改别名（改成有别名中有"_"）的问题：

返回的POJO对象：
[img]http://dl.iteye.com/upload/attachment/0083/4207/76d5f0df-7ab7-3303-921b-d2ce21995052.jpg[/img]

返回到前端的XML数据：
[img]http://dl.iteye.com/upload/attachment/0083/4209/68166889-a55d-3a36-8c4f-1b0b3719612f.jpg[/img]

按道理graphicId应该是以grapic_id作为名称，但是实际返回的是grapic__id两个下划线，这个问题如何解决，大家帮忙。感谢

Why do field names suddenly have double underscores in the generated XML?

XStream maps Java class names and field names to XML tags or attributes. Unfortunately this mapping cannot be 1:1, since some characters used for identifiers in Java are invalid in XML names. Therefore XStream uses an XmlFriendlyNameCoder to replace these characters with a replacement. By default this NameCoder uses an underscore as escape character and has therefore to escape the underscore itself also. You may provide a different configured instance of the XmlFriendlyNameCoder or a complete different implementation like the NoNameCoder to prevent name coding at all. However it is your responsibility then to ensure, that the resulting names are valid for XML.

[url]http://xstream.codehaus.org/faq.html[/url]

1、1.4及以后

2、1.4之前

<bean id="marshaller" class="org.springframework.oxm.xstream.AnnotationXStreamMarshaller">
    <property name="streamDriver">
        <bean class="com.thoughtworks.xstream.io.xml.XppDriver">
            <constructor-arg>
                <bean class="com.thoughtworks.xstream.io.xml.XmlFriendlyReplacer">
                    <constructor-arg index="0" value="_-"/>
                    <constructor-arg index="1" value="_"/>
                </bean>
            </constructor-arg>
        </bean>
    </property>
</bean>

3、注册到spring mvc
mvc:annotation-driven
mvc:message-converters




/mvc:message-converters
/mvc:annotation-driven

因为XStream用下划线当转义符。
你恐怕得自定义个NameCoder

参考

官方：http://xstream.codehaus.org/faq.html
stackoverflow:
http://stackoverflow.com/questions/9800494/xstream-double-underline-handling-java