parsing XML

[Ivy]

what's wromg with these codes? it doesnt work. thanks!!!

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.io.*;
import java.io.*;
//kxml imports
import org.kxml.*;
import org.kxml.parser.*;

public class ParseXML extends MIDlet implements CommandListener {
private Command exitCommand; // The exit command
private Command displayXML; // On execution, it displays title and description
// on phone screen
private Display display; // The display for this MIDlet
// UI Items for display of title and description on phone screen
private static TextBox t;
private static String textBoxString = "";
// XML String
private String xmlStr = "";
public ParseXML() {
display = Display.getDisplay( this );
exitCommand = new Command( "Exit", Command.EXIT, 2 );
displayXML = new Command( "XML", Command.SCREEN, 1 );
// The XML String in form of RSS
StringBuffer xmlString = new StringBuffer();
xmlString.append("<?xml version=\"1.0\"?>
<!DOCTYPE rss PUBLIC \"-//Netscape Communications//DTD RSS 0.91//EN\"");
xmlString.append("\"http://my.netscape.com/publish/formats/rss-0.91.dtd\">");
xmlString.append("<rss version=\"0.91\">");
xmlString.append("<channel><title>Meerkat: An Open Wire Service</title>");
xmlString.append("<link>http://meerkat.oreillynet.com</link>");
xmlString.append("<description>Meerkat is a Web-based syndicated content
reader based on RSS (\"Rich Site Summary\").
RSS is a fantastic, simple-yet-powerful syndication
system rapidly gaining momentum.");
xmlString.append("</description><language>en-us</language>");
xmlString.append("</channel>");
xmlString.append("</rss>");
xmlStr = xmlString.toString();
}
public void startApp() {
// The textbox displays title and description from a RSS String
t = new TextBox( "MIDlet XML", "kXML", 256, 0 );
t.addCommand( exitCommand );
t.addCommand( displayXML );
t.setCommandListener( this );
display.setCurrent( t );
}
/**
Pause is a no-op since there are no background activities or
record stores that need to be closed.
*/
public void pauseApp() { }
/**
Destroy must cleanup everything not handled by the garbage collector.
In this case there is nothing to cleanup.
*/
public void destroyApp(boolean unconditional) { }
/*
Respond to commands, including exit. On the exit command, cleanup
and notify that the MIDlet has been destroyed.
*/
public void commandAction(Command c, Displayable s) {
if ( c == exitCommand ) {
destroyApp( false );
notifyDestroyed();
}
else if ( c == displayXML ) {
try {
viewXML();
}
catch( Exception e ) {
e.printStackTrace();
}
}
}
// This function sets up kxml parser and calls traverse() to parse the whole XML String
public void viewXML() throws IOException {
try {
byte[] xmlByteArray = xmlStr.getBytes();
ByteArrayInputStream xmlStream = new
ByteArrayInputStream( xmlByteArray );
InputStreamReader xmlReader = new
InputStreamReader( xmlStream );
XmlParser parser = new XmlParser( xmlReader );
try
{
traverse( parser, "" );
}
catch (Exception exc)
{
exc.printStackTrace();
}
return;
}
catch ( IOException e ) {
return ;
} finally {
return ;
}
}
/**
Traverses the XML file
*/
public static void traverse( XmlParser parser, String indent ) throws Exception
{
boolean leave = false;
String title = new String();
String desc = new String();
do {
ParseEvent event = parser.read ();
ParseEvent pe;
switch ( event.getType() ) {
// For example, <title>
case Xml.START_TAG:
// see API doc of StartTag for more access methods
// Pick up Title for display
if ("title".equals(event.getName()))
{
pe = parser.read();
title = pe.getText();
}
// Pick up description for display
if ("description".equals(event.getName()))
{
pe = parser.read();
desc = pe.getText();
}
textBoxString = title + " " + desc;
traverse( parser, "" ) ; // recursion call for each <tag></tag>
break;
// For example </title?
case Xml.END_TAG:
leave = true;
break;
// For example </rss>
case Xml.END_DOCUMENT:
leave = true;
break;
// For example, the text between tags
case Xml.TEXT:
break;
case Xml.WHITESPACE:
break;
default:
}
} while( !leave );
t.setString( textBoxString );
}
}