How to fetch node in XML using Java?

Question

I want to fetch value of the node ServerVersion

<result>
<response id="27mSTG">
<routing>
<configs>
<linqmap.routing.RoutingServerConfig>
<SERVER_VERSION>1.0.388</SERVER_VERSION>
<PRE_PROCESSING_FILE_LOCATION/>

I have tried:

@Override
public void getProp(String prop) {
    try {
        final Document document = loadXMLFromString();
        document.getElementById(??);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

private Document loadXMLFromString() throws Exception
{
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder builder = factory.newDocumentBuilder();
    InputSource is = new InputSource(new StringReader(xmlString));
    return builder.parse(is);
}

But I'm not sure how to get the node's ID.

Is there any easier way? Maybe even string parsing is enough?

Answer 1

There is no attribute Id defined in your xml element SERVER_VERSION . You can use document.getElementByTagName("SERVER_VERSION") to get the value.

Or use XPath to read the node:

final Document document = loadXMLFromString();
 XPathFactory xpathfactory = XPathFactory.newInstance();
 XPath xpath = xpathfactory.newXPath();
 String xpathExpr="/result/SERVER_VERSION"; // assume result is the root node.
 Node node=(Node)xPath.compile(xpathExpr).evaluate(document, XPathConstants.NODE);