在向其添加节点后，如何立即更新XML文档？ [英] How do you instantly update an XML document after you add a node to it?

问题描述

所以我正在制作一个日历程序，当你向它添加一个新条目时我需要它来更新。现在，我需要点击xml文件让它更新，然后其他一切正常。

So I'm making a calendar program and I need it to update when you add a new entry to it. Right now, I need to click on the xml file to get it to update, then everything else works fine.

声明：

    private DocumentBuilderFactory documentFactory;
    private DocumentBuilder documentBuilder;
    private Document xmlDoc;
    private Node rootNode;
    private static Node dataNode;

构造函数中的赋值：

    try {
        documentFactory = DocumentBuilderFactory.newInstance();
        documentBuilder = documentFactory.newDocumentBuilder();
        xmlDoc = documentBuilder.parse(Main.class.getResourceAsStream("Calendar.xml"));
        rootNode = xmlDoc.getDocumentElement();
        dataNode = rootNode.getChildNodes().item(0);
    } catch(ParserConfigurationException | SAXException | IOException e) {e.printStackTrace(System.out);}

创建节点并在按下按钮后将其添加到 dataNode ，然后文件更新如下：

Node is created and added to dataNode after a button is pressed, then the file is updated like this:

    try {
        OutputFormat outFormat = new OutputFormat(xmlDoc);

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

            outStream.flush();
            outStream.close();
        }
    }catch(IOException e) {e.printStackTrace(System.out);}

推荐答案

您应该创建一些子流程，而不是在构造函数中加载文档，例如

Rather than loading your document in the constructor you should create some sub processes, such as

1. 将文件中的XML加载到文档


2. 创建/更新GUI，给定文件参数

1. Load the XML from the file into a Document
2. Create/Update your GUI, given a Document parameter

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