Tika 0.10能够提取元数据，但无法将其插入到XHTML输出中

Question

public class TikaParserImpl implements TikaParser
{
    private AutoDetectParser parser;

    public TikaParserImpl()
    {
        parser = new AutoDetectParser();
    }

    @Override
    public String parse(InputStream in) throws IOException, SAXException, TikaException
    {
        TransformerHandler handler;
        StringWriter writer = new StringWriter();
        try
        {
            handler = getTransformerHandler(writer);
        }
        catch (TransformerConfigurationException e)
        {
            throw new RuntimeException(e);
        }

        Metadata metadata = new Metadata();
        ParseContext context = new ParseContext();
        parser.parse(in, handler, metadata, context);

        String[] metanames = metadata.names();
        for (int i = 0; i < metanames.length; i++) {
            String[] metavalues = metadata.getValues(metanames[i]);

            for (int j = 0; j < metavalues.length; j++) {
                LOG.warn(metanames[i] + ": " + metavalues[j]);
            }
        }

        String output = writer.toString();
        return output;
    }

    /**
     * Get a TransformerHandler.
     * 
     * The handler is used to convert SAX events to a XHTML document.
     * 
     * Since this object might not be multi-threaded, it is re-created at each
     * parsing.
     * 
     * @param writer
     * @return TransformerHandler
     * @throws TransformerConfigurationException
     */
    private TransformerHandler getTransformerHandler(StringWriter writer) throws TransformerConfigurationException
    {
        // Even the factory might not be multi-threaded, so we don't take chance
        SAXTransformerFactory factory = (SAXTransformerFactory) SAXTransformerFactory.newInstance();
        TransformerHandler handler = factory.newTransformerHandler();
        handler.getTransformer().setOutputProperty(OutputKeys.METHOD, "xml");
        handler.getTransformer().setOutputProperty(OutputKeys.INDENT, "yes");
        handler.getTransformer().setOutputProperty(OutputKeys.ENCODING, "UTF-8");
        handler.getTransformer().setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
        handler.setResult(new StreamResult(writer));
        return handler;
    }
}

我是tika的新手，我正在编写的这段代码并非我写的，所以我也是新手。这里的期望是XHTML是从这个东西解析生成的。对于某些文档（例如：Office的xls格式），一切都很好。对于其他人（例如：Office的xlsx格式），我没有在XHTML中获取元数据，但它仍然存在于元数据的实例中（如您所见，我记录了元数据类的内容）

不幸的是，我不能使用更新版本的Tika，因为这会破坏我所坚持的Nutch版本。