Generic Parsing of XML in JAVA

import java.io.*;
import java.net.*;
import org.w3c.dom.*;
import org.w3c.dom.Node.*;

import oracle.xml.parser.v2.*;


public class XMLParsingUsingDOM {

 static public void main(String[] argv) {
  try {

   if (argv.length != 1) {
    // must pass in the name of the XML file
    System.err.println("Usage: java DOMExample filename");
    System.exit(1);
   }

   // Get an instance of the parser
   DOMParser parser = new DOMParser();

   // Generate a URL from the filename
   URL url = createURL(argv[0]);

   // Set various parser options; validation on,
   // warnings shown, error stream set to stderr.
   parser.setErrorStream(System.err);
   parser.setValidationMode(true);
   parser.showWarnings(true);
   // parse the do*****ent
   parser.parse(url);

   // Obtain the do*****ent
   Document doc = parser.getDocument();

   // print do*****ent elements
   System.out.print("The elements are: ");
   printElements(doc);

   // print do*****ent elements attributes
   System.out.println("The attributes of each element are: ");
   printElementAttributes(doc);

  } catch (Exception e) {
   System.out.println(e.toString());
  }
 }


 static void printElements(Document doc) {

  NodeList nodelist = doc.getElementsByTagName("*");
  Node     node;

  for (int i=0; i<nodelist.getLength(); i++) {
   node = nodelist.item(i);
   System.out.print(node.getNodeName() + " ");
  }

  System.out.println();

 }
 static void printElementAttributes(Document doc) {

  NodeList      nodelist = doc.getElementsByTagName("*");
  Node          node;
  Element       element;
  NamedNodeMap  nnm = null;

  String attrname;
  String attrval;
  int    i, len;

  len = nodelist.getLength();

  for (int j=0; j < len; j++) {
   element = (Element)nodelist.item(j);
   System.out.println(element.getTagName() + ":");
   nnm = element.getAttributes();
  }

  if (nnm != null) {
   for (i=0; i<nnm.getLength(); i++) {
    node = nnm.item(i);
    attrname = node.getNodeName();
    attrval  = node.getNodeValue();
    System.out.println(" " + attrname + " = " + attrval);
   }
  }

  System.out.println();

 }


 static URL createURL(String filename) {

  URL url = null;

  try {
   url = new URL(filename);
  } catch (MalformedURLException ex) {
   try {
    File f = new File(filename);
    url = f.toURL();
   } catch (MalformedURLException e) {
    System.out.println("Cannot create URL for: " + filename);
    System.exit(0);
   }
  }

  return url;

 }

}

XML Document

     

John
B
12


Mary
A
11


Simon
A
18