java xml parser - The DocumentBuilder

The DocumentBuilder stores its parsed result in a org.w3c.dom.Document object. You can call the Document's getDocumentelement() method to get the root node, and use the getChildNotes() method to get a list of the child nodes.

If you get compile-time warnings such as "warning: com.sun.org.apache.xerces.internal.parsers.DOMParser is Sun proprietary API and may be removed in a future release", you may consider using the SAXParser or the DocumentBuilder in the java.xml.parsers package.

import java.xml.parsers.DocumentBuilder;
import java.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;

public class XMLParser {

    public void domParse(String xmlStr) {
        try {
            InputSource source = new InputSource(new StringReader(xmlStr));
            DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
            Document doc = dBuilder.parse(source);
            System.out.println("Root element :" + doc.getDocumentElement().getNodeName());

            printNodeNameValue((Node) doc.getDocumentElement(), "Node name: ");
        } catch (ParserConfigurationException e) {
            e.printStackTrace(System.out);
        } catch (SAXException e) {
            e.printStackTrace(System.out);
        } catch (IOException e) {
            e.printStackTrace(System.out);
        }
    }
 
    private void printNodeNameValue(Node node, String nn){
        String nns = "  "+nn;
        String value = node.getNodeValue() == null ? "" : ("; node value: "+node.getNodeValue());
        System.out.println(nn+node.getNodeName()+value);
        if (node.hasChildNodes()){
            NodeList nodeList = node.getChildNodes();
            for(int i = 0; i < nodeList.getLength(); i++){
                printNodeNameValue(nodeList.item(i), nns);
            }
        }
    }
    public static void main(String[] args) {
        StringBuilder xml = new StringBuilder();
        xml.append("<store value='Deliciously Healthy'>")
                .append("<fruit>")
                .append("<name>Apple</name><price>1.68</price>")
                .append("</fruit><fruit>")
                .append("<name>Orange</name><price>0.89</price>")
                .append("</fruit>")
                .append("</store>");
        XMLParser xmlParser = new XMLParser();
        xmlParser.domParse(xml.toString());
    }
}

The output:
Root element :store
Node name: store
  Node name: fruit
    Node name: name
      Node name: #text; node value: Apple
    Node name: price
      Node name: #text; node value: 1.68
  Node name: fruit
    Node name: name
      Node name: #text; node value: Orange
    Node name: price
      Node name: #text; node value: 0.89

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