使用Transformer将Java中的org.w3c.dom.Document转换为字符串

我正在尝试使用转换器将XML org.w3c.dom.Document转换为字符串：

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

    factory.setNamespaceAware(true);
    DocumentBuilder builder = null;
    try {
        builder = factory.newDocumentBuilder();
    } catch (ParserConfigurationException e) {

        e.printStackTrace();
    }

    Document doc = builder.newDocument();

    Element gameNode = doc.createElement("Game");
    gameNode.setAttribute("gameID", String.valueOf(game.getGameID()));
    gameNode.setAttribute("username", game.getUsername());
    gameNode.setAttribute("gameStartTime", String.valueOf(game.getGameStartTime()));
    gameNode.setAttribute("gameStartDate", String.valueOf(game.getGameStartDate()));
    gameNode.setAttribute("totalScore", String.valueOf(game.getTotalScore()));
    gameNode.setAttribute("totalTimeInSeconds", String.valueOf(game.getTotalTimeInSeconds()));
    gameNode.setAttribute("lastLevel", String.valueOf(game.getLastLevel()));
    gameNode.setAttribute("firstLevel", String.valueOf(game.getFirstLevel()));

    doc.appendChild(gameNode);



    for(int i = 0 ; i < game.getScores().size(); i++)
    {
        Element scoreNode = doc.createElement("Score");
        scoreNode.setAttribute("gameID", String.valueOf(game.getScores().get(i).getGameID()));
        scoreNode.setAttribute("points", String.valueOf(game.getScores().get(i).getPoints()));
        scoreNode.setAttribute("levelOfScore", String.valueOf(game.getScores().get(i).getLevelOfScore()));
        scoreNode.setAttribute("timeToScore", String.valueOf(game.getScores().get(i).getTimeToScore()));

        gameNode.appendChild(scoreNode);
    }


    return DocumentToString(doc);

---

由于某些原因，transformer.transform方法没有成功完成。

这是一个文档转换器，对我来说很好

public String getStringFromDoc(Document doc) throws TransformerException {

        DOMSource domSource = new DOMSource(doc);
        StringWriter writer = new StringWriter();
        StreamResult result = new StreamResult(writer);
        TransformerFactory tf = TransformerFactory.newInstance();
        Transformer transformer = tf.newTransformer();
        transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
        transformer.setOutputProperty(OutputKeys.INDENT, "yes");
        transformer.transform(domSource, result);
        writer.flush();
        return writer.toString();
    }

---

这是一个文档转换器，对我来说很好

public String getStringFromDoc(Document doc) throws TransformerException {

        DOMSource domSource = new DOMSource(doc);
        StringWriter writer = new StringWriter();
        StreamResult result = new StreamResult(writer);
        TransformerFactory tf = TransformerFactory.newInstance();
        Transformer transformer = tf.newTransformer();
        transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
        transformer.setOutputProperty(OutputKeys.INDENT, "yes");
        transformer.transform(domSource, result);
        writer.flush();
        return writer.toString();
    }

---

告诉我们它是如何失败的！告诉我们它是如何失败的！