如何使用XStreamMarshaller手动封送对象？

Question

这是在使用org.springframework.web.client.RestTemplate对服务进行休息调用的rest客户端的上下文中。

它使用XStreamMarshaller将实体编组为XML。

final public MarshallingHttpMessageConverter marshallingHttpMessageConverter(){
    final MarshallingHttpMessageConverter marshallingHttpMessageConverter = new MarshallingHttpMessageConverter();
    marshallingHttpMessageConverter.setMarshaller( xstreamMarshaller() );
    marshallingHttpMessageConverter.setUnmarshaller( xstreamMarshaller() );

    return marshallingHttpMessageConverter;
}

final public XStreamMarshaller xstreamMarshaller(){
    final XStreamMarshaller xStreamMarshaller = new XStreamMarshaller();
    xStreamMarshaller.setAutodetectAnnotations( true );
    xStreamMarshaller.setMode( XStream.SINGLE_NODE_XPATH_RELATIVE_REFERENCES);
    xStreamMarshaller.setAnnotatedClasses( new Class[] { User.class, UserRole.class, Role.class, RolePrivilege.class, Privilege.class } );
    xStreamMarshaller.getXStream().addDefaultImplementation( java.sql.Timestamp.class, java.util.Date.class );

    return xStreamMarshaller;
}

如何使用XStreamMarshaller手动获取在进行HTTP调用之前通过网络发送的XML？