a ReadXMLFile Servlet works without my expectation...

[Mellihoney Michael]

the xml file:
<?xml version="1.0" encoding="UTF-8"?>
<booklist>
<book>
  <title>:</title>
  <author>Michael</author>
  <isbn>10010-1234-5567</isbn>
  <publisher>
     <name>Lence</name>
     <country>Japan</country>
  </publisher>
</book>
</booklist>

my servlet program

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.FactoryConfigurationError;
import javax.xml.parsers.ParserConfigurationException;
import java.io.File;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.DOMException;

public class ReadXMLFile{
  //Global value so it can be ref'd by the tree-adapter
  static Document document;
  public static void main(String argv[]){
  //create an input source
  File xmlFile = new File("booklist.xml");
  //create an instance of document builder that contains a parser
  DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
  try {
   DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
   //parse and create the in-memory document object
   document = docBuilder.parse(xmlFile);
   //get reference to the root document
   Node rootNode = document.getDocumentElement();
   NamedNodeMap nnm1 = rootNode.getAttributes();
   System.out.println("The root node is : "+rootNode.getNodeName());
   recursiveGetNodes(rootNode);
  }
  catch (Exception e) { e.printStackTrace(); }
  } // main()
  public static void recursiveGetNodes(Node r){
   //get the children of the root element and process ALL the child node.
   NodeList children = r.getChildNodes();
   if (children!=null){
     for (int i=0;i < children.getLength(); i++) {
       Node n = children.item(i);
       if (n.getNodeName()!=null&&!n.getNodeName().equals("#text")){
         System.out.println("The child node is : "+n.getNodeName()+ " and the node value is: "+n.getNodeValue());
         recursiveGetNodes(n);
       }
     } 
   }
  }
}//class

the result is:

The root node is : booklist
The child node is : book and the node value is: null
The child node is : title and the node value is: null
The child node is : author and the node value is: null
The child node is : isbn and the node value is: null
The child node is : publisher and the node value is: null
The child node is : name and the node value is: null
The child node is : country and the node value is: null

But I want to read all ChildNode's NodeValue instead of null.
for example,<author>Michael</author>,so The child node is : author and the node value is: "Michael" instead of "null"...
How can I achieve this?
Thanks in advance...

[Lasse Koskela]

If you take a look at org.w3c.dom.Node class' javadocs, you'll find a nice table summarizing what getNodeName() and getNodeValue() will return for different types of nodes.
For elements, getNodeValue() always returns null. That's because they don't have a value, but child elements. In your case, the "author" element has one or more child elements of type "#text"... You need to getChildNodes() and append their values together in order to get "Michael".

[prat narang]

hi,
just change u'r recursiveGetNodes function like i've done in bold and u'll get the desired output.

public static void recursiveGetNodes(Node r){   
//get the children of the root element and process ALL the child node.   
NodeList children = r.getChildNodes();   
if (children!=null)
{    
for (int i=0;i < children.getLength(); i++)
{       
Node n = children.item(i);       

if (n.getNodeName()!=null && !n.getNodeName().equals("#text"))
{         
[B]Node child = n.getFirstChild();[/B]
System.out.println("The child node is : "+n.getNodeName()+ " and the node value is: "+[B]child.getNodeValue()[/B]);
recursiveGetNodes(n); 
}
}
}
--prateek narang--
}