setting attribute/node in XML in java

Question

Here's my XML:

<root>
   <A id='1'>
     <B>Blah</B>
     <C>Test</C>
   </A>
</root>

I would like to add under so my final XML would like:

<root>
   <A id='1'>
     <B>Blah</B>
     <C>Test</C>
     <D>New value</D>
    </A>
</root>

I can get the node in XPath using //Aand I am not sure how to add or edit the values once I get the node.

There's many similar questions, please look around first. What technologies do you use and how is the value for the new node supplied? This is rather important to know. Do you use SAX, StAX, DOM, JDOM...? Are your parsing, transforming using XSLT, binding with JAXB? — G_H
– G_H, Commented Oct 27, 2011 at 14:34

Sahil Muthoo · Accepted Answer · 2011-10-27 16:07:33Z

4

DocumentBuilder db = DocumentBuilderFactory.newInstance().newDocumentBuilder();
StringReader xml = new StringReader("<root><A id='1'><B>Blah</B><C>Test</C></A></root>");
Document doc = db.parse(new InputSource(xml));
XPathFactory xPathfactory = XPathFactory.newInstance();
XPath xpath = xPathfactory.newXPath();
XPathExpression expr = xpath.compile("//A");
Element element = doc.createElement("D");
element.setTextContent("new value");
NodeList nodes = (NodeList) expr.evaluate(doc, XPathConstants.NODESET);
for(int i = 0; i < nodes.getLength(); i++) {  
    Node node = nodes.item(i);
    node.appendChild(element);
}

edited Oct 27, 2011 at 16:07

answered Oct 27, 2011 at 14:56

Sahil Muthoo

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G_H · Accepted Answer · 2011-10-27 14:57:46Z

0

Check this method of the Node interface from DOM. Element extends this, so you'll first need to obtain the Element for A. Use this method on your Document instance, or some other suitable method from the class, to create the desired D element, then set its contents.

answered Oct 27, 2011 at 14:57

G_H

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Comments

Lukas Eder · Accepted Answer · 2012-01-26 12:55:41Z

0

Apart from using the DOM API directly, you can also use jOOX, a simple wrapper library for DOM, that I have created:

// With css-style selectors
$(document).find("A").append("<D>New value</D>");

// With XPath
$(document).xpath("//A").append("<D>New value</D>");

answered Jan 26, 2012 at 12:55

Lukas Eder

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