Get XML node with namespace in java

Question

I have the next XML:

<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
<Invoice xmlns="urn:oasis:names:specification:ubl:schema:xsd:Invoice-2" 
         xmlns:cac="urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2"
         xmlns:cbc="urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2"
         xmlns:ccts="urn:un:unece:uncefact:documentation:2"
         xmlns:ds="http://www.w3.org/2000/09/xmldsig#"
         xmlns:ext="urn:oasis:names:specification:ubl:schema:xsd:CommonExtensionComponents-2"
         xmlns:qdt="urn:oasis:names:specification:ubl:schema:xsd:QualifiedDatatypes-2"
         xmlns:sac="urn:sunat:names:specification:ubl:peru:schema:xsd:SunatAggregateComponents-1"
         xmlns:udt="urn:un:unece:uncefact:data:specification:UnqualifiedDataTypesSchemaModule:2"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <ext:UBLExtensions>
        <ext:UBLExtension>
            <ext:ExtensionContent>
                <!-- SOME CODE HERE -->
            </ext:ExtensionContent>
        </ext:UBLExtension>
        <ext:UBLExtension>
            <ext:ExtensionContent>
                <!-- I WANT TO GET THIS NODE -->
            </ext:ExtensionContent>
        </ext:UBLExtension>
    </ext:UBLExtensions>

How can I get this node? I've tried

Document doc = dbf.newDocumentBuilder().parse(new FileInputStream(PATH_TO_MY_XML));
NodeList nodes = doc.getDocumentElement().getElementsByTagNameNS("*", "UBLExtension");

but it returns an empty array. How can I do it?

Many thanks. This is the response. Can you answer to mark it as aswered? (Sorry for my English) — Giancarlo Ventura
– Giancarlo Ventura, Commented Jul 11, 2016 at 16:28

Levent Divilioglu · Accepted Answer · 2016-07-11 16:44:26Z

5

A - Demo Code

import java.io.File;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class GetXMLNodeInJavaDemo {

    public static void main(String[] args) {

        try {
            File fXmlFile = new File("sampleFile.xml");
            DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();

            dbFactory.setNamespaceAware(true);

            DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
            Document doc = dBuilder.parse(fXmlFile);

            doc.getDocumentElement().normalize();

            printByElementTagname(doc);

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static void printByElementTagname(Document doc) {
        NodeList nodes = doc.getDocumentElement().getElementsByTagNameNS("*", "UBLExtension");
        Node node;
        for(int i = 0; i < nodes.getLength(); i++) {
            node = nodes.item(i);
            System.out.println(node.getNodeName() + " : " + node.getTextContent().trim());
        }
    }

}

B - Sample File : sampleFile.xml

<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
<Invoice xmlns="urn:oasis:names:specification:ubl:schema:xsd:Invoice-2" 
         xmlns:cac="urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2"
         xmlns:cbc="urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2"
         xmlns:ccts="urn:un:unece:uncefact:documentation:2"
         xmlns:ds="http://www.w3.org/2000/09/xmldsig#"
         xmlns:ext="urn:oasis:names:specification:ubl:schema:xsd:CommonExtensionComponents-2"
         xmlns:qdt="urn:oasis:names:specification:ubl:schema:xsd:QualifiedDatatypes-2"
         xmlns:sac="urn:sunat:names:specification:ubl:peru:schema:xsd:SunatAggregateComponents-1"
         xmlns:udt="urn:un:unece:uncefact:data:specification:UnqualifiedDataTypesSchemaModule:2"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <ext:UBLExtensions>
        <ext:UBLExtension>
            <ext:ExtensionContent>
                Some Code
            </ext:ExtensionContent>
        </ext:UBLExtension>
        <ext:UBLExtension>
            <ext:ExtensionContent>
                What you want
            </ext:ExtensionContent>
        </ext:UBLExtension>
    </ext:UBLExtensions>
</Invoice>

C - Sample Output

ext:UBLExtension : Some Code
ext:UBLExtension : What you want

answered Jul 11, 2016 at 16:44

Levent Divilioglu

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4 Comments

Levent Divilioglu Over a year ago

@Giancarlo Ventura Granados Well I'll be happier if it really helps, you can give an upvote for it :)

Giancarlo Ventura Over a year ago

I still can not upvote your response, I only have 13 rep points

Levent Divilioglu Over a year ago

@Giancarlo Ventura Not a problem, I didn't know there's such a mechanism I'm sorry. Welcome to the stack overflow :)

Levent Divilioglu Over a year ago

@Giancarlo Ventura Granados I've noticed :D

Andreas · Accepted Answer · 2016-07-11 16:28:45Z

2

You need to make sure the XML parser is namespace aware.

You should also make sure to close the FileInputStream, preferably using try-with-resources.

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setNamespaceAware(true);

Document doc;
try (InputStream xmlStream = new FileInputStream(PATH_TO_MY_XML)) {
    doc = dbf.newDocumentBuilder().parse(xmlStream);
}
NodeList nodes = doc.getDocumentElement().getElementsByTagNameNS("*", "UBLExtension");

answered Jul 11, 2016 at 16:28

Andreas

160k13 gold badges164 silver badges262 bronze badges

2 Comments

Giancarlo Ventura Over a year ago

Many thanks, this is the response. I still can not give you points , but I have marked as correct.

Andreas Over a year ago

It is also better to actually specify the namespace, rather than using wildcard. Define a static final String constant, e.g. EXT_NS = "urn:oasis:names:specification:ubl:schema:xsd:CommonExtensionComponents-2", and use it in place of "*".

Frank M. · Accepted Answer · 2016-07-11 16:28:44Z

1

You can try to work with xpath

public static NodeList getNodesWithXPath(Node aNode, String aXPath) {
    try {
        XPathFactory xPathfactory = XPathFactory.newInstance();
        XPath xpath = xPathfactory.newXPath();
        XPathExpression xPathExpression = xpath.compile(aXPath);
        return (NodeList) xPathExpression.evaluate(aNode, XPathConstants.NODESET);
    } catch (XPathExpressionException e) {
        // ignore
    } catch (NullPointerException e) {
        // ignore
    }
    return null;
}

answered Jul 11, 2016 at 16:28

Frank M.

1,0071 gold badge11 silver badges19 bronze badges

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Get XML node with namespace in java

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