XStream：具有属性的节点和文本节点？

写一个转换器，应该类似于代码片段

class FieldDtoConvertor implements Converter {    @SuppressWarnings("unchecked")    public boolean canConvert(final Class clazz) {        return clazz.equals(FieldDto.class);    }    public void marshal(final Object value, final HierarchicalStreamWriter writer, final MarshallingContext context) {        final FieldDto fieldDto = (FieldDto) value;        writer.addAttribute(fieldDto.getAttributeName(), fieldDto.getAttributevalue());         }}

在使用XStream时，注册转换器

final XStream stream = new XStream(new DomDriver());stream.registerConverter(new FieldDtoConvertor());