How to make XStream skip unmapped tags when parsing XML?

XStream xstream = new XStream() {
    @Override
    protected MapperWrapper wrapMapper(MapperWrapper next) {
        return new MapperWrapper(next) {
            @Override
            public boolean shouldSerializeMember(Class definedIn, String fieldName) {
                if (definedIn == Object.class) {
                    return false;
                }
                return super.shouldSerializeMember(definedIn, fieldName);
            }
        };
    }
};

转载自：http://stackoverflow.com/questions/5377380/how-to-make-xstream-skip-unmapped-tags-when-parsing-xml