This question is an exact duplicate of:
I'm using Node.setTextContent() to edit a node but it's not changing anything in the file. If I print the text content after it will appear as changed but it will not persist after the program is closed.
for (int y=0; y<calendarDataNode.getChildNodes().getLength(); y++) {
//if (year node name == "y" + current year)
if (calendarDataNode.getChildNodes().item(y).getNodeName().equals("y" + Main.year)) {
//for (int m=0; m<number of child nodes of year node; m++)
for (int m=0; m<calendarDataNode.getChildNodes().item(y).getChildNodes().getLength(); m++) {
//if (month node name == "m" + current month)
if (calendarDataNode.getChildNodes().item(y).getChildNodes().item(m).getNodeName().equals("m" + (Main.month_index-1))) {
//for (int d=0; d<number of child nodes of month node; d++)
for (int d=0; d<calendarDataNode.getChildNodes().item(y).getChildNodes().item(m).getChildNodes().getLength(); d++) {
//label node
node = calendarDataNode.getChildNodes().item(y).getChildNodes().item(m).getChildNodes().item(d).getChildNodes().item(0);
node.setTextContent(tf_label.getText());
}
}
}
}
}
try (FileOutputStream outStream = new FileOutputStream("Calendar.xml")) {
Transformer tf = TransformerFactory.newInstance().newTransformer();
tf.setOutputProperty(OutputKeys.INDENT, "yes");
tf.setOutputProperty(OutputKeys.METHOD, "xml");
tf.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
DOMSource domSource = new DOMSource(xmlDoc);
StreamResult sr = new StreamResult(outStream );
tf.transform(domSource, sr);
} catch (TransformerException | IOException e) {e.printStackTrace(System.out);}
Replace...
OutputFormat outFormat = new OutputFormat(xmlDoc);
try (FileOutputStream outStream = new FileOutputStream("src/virtualagenda/Calendar.xml")) {
XMLSerializer serializer = new XMLSerializer(outStream, outFormat);
serializer.serialize(xmlDoc);
outStream.close();
}catch(IOException e) {e.printStackTrace(System.out);}
With something more like...
Transformer tf = TransformerFactory.newInstance().newTransformer();
tf.setOutputProperty(OutputKeys.INDENT, "yes");
tf.setOutputProperty(OutputKeys.METHOD, "xml");
tf.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
try (FileOutputStream outStream = new FileOutputStream("Calendar.xml")) {
DOMSource domSource = new DOMSource(document);
StreamResult sr = new StreamResult(outStream );
tf.transform(domSource, sr);
} catch (TransformerConfigurationException, TransformerException exp) {
exp.printStackTrace();
}
Updated with runnable example
So using...
<?xml version="1.0" encoding="UTF-8"?>
<fruit>
<banana>yellow</banana>
<orange>orange</orange>
<pear>yellow</pear>
</fruit>
And then using...
try {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.parse(new File("Calendar.xml"));
NodeList nodeList = document.getDocumentElement().getChildNodes();
for (int index = 0; index < nodeList.getLength(); index++) {
Node node = nodeList.item(index);
if (node.getNodeType() != Node.TEXT_NODE) {
node.setTextContent("Some text");
}
}
Transformer tf = TransformerFactory.newInstance().newTransformer();
tf.setOutputProperty(OutputKeys.INDENT, "yes");
tf.setOutputProperty(OutputKeys.METHOD, "xml");
tf.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
try (FileOutputStream os = new FileOutputStream(new File("Calendar.xml"))) {
DOMSource domSource = new DOMSource(document);
StreamResult sr = new StreamResult(os);
tf.transform(domSource, sr);
}
} catch (SAXException | TransformerException | IOException | ParserConfigurationException ex) {
ex.printStackTrace();
}
Outputs...
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<fruit>
<banana>Some text</banana>
<orange>Some text</orange>
<pear>Some text</pear>
</fruit>
The transformation code works, there is something else within your code which you're not showing us which isn't working...
来源:https://stackoverflow.com/questions/28017222/how-do-you-update-an-xml-file-after-you-change-a-node