Getting all child element from root element

[Tay Thotheolh]

import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

public NodeList doParse(String xmlFilePath) {
        NodeList nodes = null;
        try {
            File xmlFile = new File(xmlFilePath);
            Document doc = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(xmlFile.getAbsolutePath());
            nodes = (NodeList) doc.getDocumentElement();
        } catch (SAXException ex) {
            Logger.getLogger(XMLParser.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(XMLParser.class.getName()).log(Level.SEVERE, null, ex);
        } catch (ParserConfigurationException ex) {
            Logger.getLogger(XMLParser.class.getName()).log(Level.SEVERE, null, ex);
        }
        return nodes;
    }
 

Hi , that's my code above. How do I get all following elements from an XML document ?

I use the below codes to test...

import org.jcurrency.xml.XMLParser;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

private void testReadXML() {
        XMLParser parser = new XMLParser();
        Element element;
        NodeList nodes = parser.doParse("essentials/cache/datacache.xml");
        System.out.println("Nodes Length: " + nodes.getLength());
        for (int i = 0; i < nodes.getLength(); i++) {
            element =  (Element) nodes.item(i);
            System.out.println("Node: " + element.getNodeName());
            System.out.println("Node Val: " + element.getTextContent());
        }
        System.out.println(nodes.toString());
        

    }
 

My xml I am parsing is this below...

<?xml version="1.0" encoding="UTF-8"?>
<cache>
    <meta datecached=""/>
    <data>
        <currency from="SGD" to="SGD"><!-- rate of currency -->1.0</currency>
        <currency from="SGD" to="GBP"><!-- rate of currency -->0.2</currency>
    </data>
</cache>

And the output when running the test is...

Nodes Length: 0
[cache: null]

How could nodes length be 0 when there's so many nodes in the xml documents as you can see ?

If you noticed, I didn't put to class and full codes since it's going to make this post very long so I only post the imports and the essential codes so that anyone can get an idea what I am trying to do.

[Balu Sadhasivam]

Tay,

 nodes = (NodeList) doc.getDocumentElement();  

Why do you want to get NodeList here. getDocumentElement() returns Element(which implements Node) . Typically you get Node first and get child Nodes from it. This is right way to use.

	        Node node = doc.getDocumentElement();
	        NodeList nl = node.getChildNodes();

[Tay Thotheolh]

Thanks for the help