java - 程序运行时如何写入xml文件？

我设法以所需的方式写入xml文件，但是它只会在程序退出后才更新文件。我希望在按下按钮后立即更新文件。

这是我正在使用的代码。单击JButton即可运行。

    try {
        documentFactory = DocumentBuilderFactory.newInstance();
        documentBuilder = documentFactory.newDocumentBuilder();
        xmlDoc = documentBuilder.parse(Reminders.class.getResourceAsStream("Reminders.xml"));
    } catch(ParserConfigurationException | SAXException | IOException e) {
        e.printStackTrace();
    }

    Node rNode = xmlDoc.getChildNodes().item(0);
    Node remindersNode = xmlDoc.getElementsByTagName("reminders").item(0);
    Node newReminder = xmlDoc.createElement("r" + remindersNode.getChildNodes().getLength()/2);

    // Elements are created and put together
    // Redacted because they take up too much space

    OutputFormat outFormat = new OutputFormat(xmlDoc);
    outFormat.setIndenting(true);

    try {
        FileOutputStream outStream = new FileOutputStream("src/virtualagenda/Reminders.xml");
        XMLSerializer serializer = new XMLSerializer(outStream, outFormat);
        serializer.serialize(xmlDoc);

        outStream.flush();
        outStream.close();

    }catch(IOException e) {e.printStackTrace();}

最佳答案

怎么样：

outStream.flush();
outStream.close();

强迫写作？