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使用Transformer将Java中的org.w3c.dom.Document转换为String

我正在尝试使用Transformer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);

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我正在使用名为Game and Score的对象，它不应干扰该过程。