如何使JAR文件更改XML文件？

Question

我试图通过jar文件重写一个xml文件。现在，jar文件可以读取xml文件，但它无法重写它。这是代码：

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public static void addMoney(int money) {
        try {
            DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
            Document doc = docBuilder.parse(SaveData.class.getResourceAsStream("SaveData.xml"));
            Element udata = doc.getDocumentElement();
            udata.normalize();
            Node mnode = udata.getElementsByTagName("money").item(0);
            int mony = Integer.parseInt(mnode.getTextContent())+money;
            mnode.setTextContent(""+mony);
            TransformerFactory transformerFactory = TransformerFactory.newInstance();
            Transformer transformer = transformerFactory.newTransformer();
            DOMSource source = new DOMSource(doc);
            StreamResult result = new StreamResult(new File("SaveData.xml"));
            transformer.transform(source, result);
        } catch(Exception e) { e.printStackTrace(); }
    }

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我认为错误在于我如何编写StreamResult结果。