XPath with namespace in Java

Question

I would like to get all the content in between the tags but I do not know how to do this because of the urn: namespace.

<urn:ResponseStatus version="1.0" xmlns:urn="urn:camera-org">  <urn:requestURL>/CAMERA/Streaming/status</urn:requestURL> <urn:statusCode>4</urn:statusCode> <urn:statusString>Invalid Operation</urn:statusString> <urn:id>0</urn:id>  </urn:ResponseStatus> 

Any ideas?

Answer 1

1. Short answer: use XPath local-name(). Like this: xPathFactory.newXPath().compile("//*[local-name()='requestURL']/text()"); will return /CAMERA/Streaming/status
2. Or you can implement a NamespaceContext that maps namespaces names and URIs and set it on the XPath object before querying.
3. Take a look at this blog article, Update: the article is down, you can see it on webarchive

Solution 1 sample:

XPath xpath = XPathFactory.newInstance().newXPath(); String responseStatus = xpath.evaluate("//*[local-name()='ResponseStatus']/text()", document); System.out.println("-> " + responseStatus); 

Solution 2 sample:

// load the Document Document document = ...; NamespaceContext ctx = new NamespaceContext() {     public String getNamespaceURI(String prefix) {         return prefix.equals("urn") ? "urn:camera-org" : null;      }     public Iterator getPrefixes(String val) {         return null;     }     public String getPrefix(String uri) {         return null;     } }; XPath xpath = XPathFactory.newInstance().newXPath(); xpath.setNamespaceContext(ctx); String responseStatus = xpath.evaluate("//urn:ResponseStatus/text()", document); System.out.println("-> " + responseStatus); 

Edit

This is a complete example, it correctly retrieve the element:

String xml = "<urn:ResponseStatus version=\"1.0\" xmlns:urn=\"urn:camera-org\">\r\n" + //         "\r\n" + //         "<urn:requestURL>/CAMERA/Streaming/status</urn:requestURL>\r\n" + //         "<urn:statusCode>4</urn:statusCode>\r\n" + //         "<urn:statusString>Invalid Operation</urn:statusString>\r\n" + //         "<urn:id>0</urn:id>\r\n" + //         "\r\n" + //         "</urn:ResponseStatus>"; DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); factory.setNamespaceAware(true); DocumentBuilder builder = factory.newDocumentBuilder(); Document doc = builder.parse(new java.io.ByteArrayInputStream(xml.getBytes())); XPath xpath = XPathFactory.newInstance().newXPath(); xpath.setNamespaceContext(new NamespaceContext() {     public String getNamespaceURI(String prefix) {         return prefix.equals("urn") ? "urn:camera-org" : null;     }      public Iterator<?> getPrefixes(String val) {         return null;     }      public String getPrefix(String uri) {         return null;     } }); XPathExpression expr = xpath.compile("//urn:ResponseStatus"); Object result = expr.evaluate(doc, XPathConstants.NODESET); NodeList nodes = (NodeList) result; for (int i = 0; i < nodes.getLength(); i++) {     Node currentItem = nodes.item(i);     System.out.println("found node -> " + currentItem.getLocalName() + " (namespace: " + currentItem.getNamespaceURI() + ")"); }