Write an element to XML file

[eranga262154]

Hi all,

I have a xml file, the structure as follows.

<?xml version="1.0"?>

<data>
<key>467</key>
<name>eranga262154</name>
</data>

I want to write extra tag as follows

<?xml version="1.0"?>

<data>
<key>467</key>
<name>eranga262154</name>
<id>123</id>
</data>

How can I do that. I'll try something like this, but it's not update my xml file.

            DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
            
            Document doc = docBuilder.parse (new File("records.xml"));
            
        // Try to add an additional node
            Node data = doc.getFirstChild();
            NamedNodeMap dataAttributes = data.getAttributes();
            Attr options = doc.createAttribute("id");
            options.setValue("123");
            dataAttributes.setNamedItem(options);

[ComputerJy]

You're code is not writing the values to the file

[eranga262154]

Can you tell me where I'm going wrong.

[eranga262154]

I start this in different way. My initial file is like this.

 <?xml version="1.0"?>

<data>
<key>467</key>
<name>eranga262154</name>
<id>123</id>
</data>

I want to read the value of id and change it and write back. Here is the way I read the value.

        try{
            DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
            
            Document doc = docBuilder.parse (new File("records.xml"));
            
            NodeList ints = doc.getElementsByTagName("id");
            if(ints.getLength() != 0) {
                Element firstKeyElement = (Element)ints.item(0);
                NodeList firstKey = firstKeyElement.getChildNodes();
                
                String value = ((Node)firstKey.item(0)).getNodeValue().trim();
                int intValue = Integer.parseInt(value);
                System.out.println(value);
                
            // change the value and write it to the same location

             }
        }

How can I write value in this way. I tried setNodeValue() and it wont work. No compile or runtime error either.