Parsing an xml file using xerces DOM parser

Question

Hi
I want to parse a simple xml file using DOM parser.
The file is
<Item>
     <SubItem>
          <title>SubItem0</title>
          <attr1>0</attr1>
          <attr2>0</attr2>
          <attr3>0</attr3>
     </SubItem>
     <SubItem>
          <title>SubItem1</title>
          <attr1>1</attr1>
          <attr2>0</attr2>
          <attr3>0</attr3>
     </SubItem>
     <SubItem>
          <title>SubItem2</title>
          <attr1>1</attr1>
          <attr2>1</attr2>
          <attr3>0</attr3>
          <SubItem>
               <title>SubItem20</title>
               <attr1>2</attr1>
               <attr2>1</attr2>
               <attr3>0</attr3>
          </SubItem>
          <SubItem>
               <title>SubItem21</title>
               <attr1>1</attr1>
               <attr2>1</attr2>
               <attr3>0</attr3>
          </SubItem>
     </SubItem>
</Item>
I just want to parse this file and want to store the values in desired datastructures,
I am trying using DOM parser, since it gives a tree structure, which is ok in this case.
public void init()
          InputReader ir     =new InputReader("Habsys");
          Document      doc     =ir.read("Habitat");
          System.out.println(doc);
          traverse(doc);
private void traverse(Document idoc)
          NodeList lchildren=idoc.getElementsByTagName("SubItem");
          for(int i=0;i<lchildren.getLength();i++)
               String lgstr=lchildren.item(i).getNodeName();
               if(lgstr.equals("SubItem"))
                    traverse(lchildren.item(i));
private void traverse (Node node) {
int type = node.getNodeType();
if (type == Node.ELEMENT_NODE)
System.out.println ("Name :"+node.getNodeName());
if(!node.hasChildNodes())
System.out.println ("Value :"+node.getNodeValue());
NodeList children = node.getChildNodes();
if (children != null) {
for (int i=0; i< children.getLength(); i++)
traverse (children.item(i));
But I am not getting required results, a lot of values I am getting as null
Could anybody tell me how to retrieve the data from the xml file, I simply want to read data and store it in data structures. For eg, for tag Subitem with title as ' SubItem1' has attr1 as '1', attr2 as'0' and attr3 as '0'.
Thanks
Gaurav

Answer 1

Check This Sample Code....
public void amethod(){
DocumentBuilderFactory dbf = null;
DocumentBuilder docBuilder = null;
Document doc = null;
try{
     dbf = DocumentBuilderFactory.newInstance();
     db = dbf.newDocumentBuilder();
     doc = db.parse(New File("path/to/your/file"));
     Node root = doc.getDocumentElement();
     System.out.println("Root Node = " + root.getNodeName());
     readNode(root);
}catch(FactoryConfigurationError fce){ fce.printStackTrace();
}catch(ParserConfigurationException pce){  pce.printStackTrace();
}catch(IOException ioe){  ioe.printStackTrace();
}catch(SAXException saxe){  saxe.printStackTrace();
private void readNode(Node node) {
System.out.println("Current Node = " + node.getNodeName());
readAttributes(node);
readChildren(node);
private void readAttributes(Node node) {
if (!node.hasAttributes())
     return;
System.out.println("Attributes:");
NamedNodeMap attrNodes = node.getAttributes();
for (int i=0; i<attrNodes.getLength(); i++) {
Attr attr = (Attr)attrNodes.item(i);
System.out.println(attr.getNodeName() + " => " + attr.getNodeValue());
private void readChildren(Node node) {
if (!node.hasChildNodes())
     return;
System.out.println("Value/s:");
NodeList childNodes = node.getChildNodes();
for (int i=0; i<childNodes.getLength(); i++) {
Node child = (Node)childNodes.item(i);
if (child.getNodeType() == Node.ELEMENT_NODE) {
readNode(child);
continue;
if (child.getNodeType() == Node.TEXT_NODE) {
if (child.getNodeValue()!=null)
System.out.println(child.getNodeValue());