problem of writing to a local file ( JApplet )

Hi friend,

import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BorderFactory;
import javax.swing.GroupLayout;

import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.LayoutStyle;
import javax.swing.SwingUtilities;
import javax.swing.border.BevelBorder;
import javax.swing.border.LineBorder;

//import controller.Controller;


public class GuestBook extends javax.swing.JApplet implements ActionListener {
private JLabel nameLabel;
private JLabel mailLabel;
private JLabel webLabel;
public JTextField webTextField;
public JTextField mailTextField;
public JTextField nameTextField;
private JPanel Panel1;
private JScrollPane commentScroll;
private JButton jButton1;
private JPanel buttonPanel;
private JButton submitButton;
private JPanel commentPanel;
public JTextArea commentTextArea;

/**
* Auto-generated main method to display this
* JApplet inside a new JFrame.
*/
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JFrame frame = new JFrame();
GuestBook gbook = new GuestBook();
frame.getContentPane().add(gbook);
((JComponent)frame.getContentPane()).setPreferredSize(gbook.getSize());
frame.setSize(500,400);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
});
}
public GuestBook() {
super();
initGUI();
}
private void initGUI() {
try {
GroupLayout thisLayout = new GroupLayout((JComponent)getContentPane());
getContentPane().setLayout(thisLayout);
this.setSize(427, 349); {
Panel1 = new JPanel();
GroupLayout jPanel1Layout = new GroupLayout((JComponent)Panel1);
Panel1.setLayout(jPanel1Layout);
Panel1.setBorder(BorderFactory.createEtchedBorder(BevelBorder.LOWERED));{
webLabel = new JLabel();
webLabel.setText("web address:");
}
{
mailLabel = new JLabel();
mailLabel.setText("Email Address:");
}
{
nameTextField = new JTextField();
}
{
mailTextField = new JTextField();
}
{
webTextField = new JTextField();
}
{
nameLabel = new JLabel();
nameLabel.setText("Your name:");
}

jPanel1Layout.setVerticalGroup(jPanel1Layout.createSequentialGroup().addContainerGap(24, 24)
.addGroup(jPanel1Layout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(nameTextField, GroupLayout.Alignment.BASELINE, GroupLayout.PREFERRED_SIZE, 26, GroupLayout.PREFERRED_SIZE)
.addComponent(nameLabel, GroupLayout.Alignment.BASELINE, GroupLayout.PREFERRED_SIZE, GroupLayout.PREFERRED_SIZE, GroupLayout.PREFERRED_SIZE))
.addGap(18)
.addGroup(jPanel1Layout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(mailTextField, GroupLayout.Alignment.BASELINE, GroupLayout.PREFERRED_SIZE, 26, GroupLayout.PREFERRED_SIZE)
.addComponent(mailLabel, GroupLayout.Alignment.BASELINE, GroupLayout.PREFERRED_SIZE, GroupLayout.PREFERRED_SIZE, GroupLayout.PREFERRED_SIZE))
.addGap(19)
.addGroup(jPanel1Layout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(webLabel, GroupLayout.Alignment.BASELINE, GroupLayout.PREFERRED_SIZE, GroupLayout.PREFERRED_SIZE, GroupLayout.PREFERRED_SIZE)
.addComponent(webTextField, GroupLayout.Alignment.LEADING, GroupLayout.PREFERRED_SIZE, 26, GroupLayout.PREFERRED_SIZE))
.addContainerGap(19, 19));
jPanel1Layout.setHorizontalGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap().addGroup(jPanel1Layout.createParallelGroup()
.addComponent(webLabel, GroupLayout.Alignment.LEADING, GroupLayout.PREFERRED_SIZE, 91, GroupLayout.PREFERRED_SIZE)
.addGroup(GroupLayout.Alignment.LEADING, jPanel1Layout.createSequentialGroup()
.addComponent(nameLabel, GroupLayout.PREFERRED_SIZE, 81, GroupLayout.PREFERRED_SIZE)
.addGap(10))
.addComponent(mailLabel, GroupLayout.Alignment.LEADING, GroupLayout.PREFERRED_SIZE, 91, GroupLayout.PREFERRED_SIZE))
.addGap(29, 29, 29)
.addGroup(jPanel1Layout.createParallelGroup()
.addComponent(nameTextField, GroupLayout.Alignment.LEADING, GroupLayout.PREFERRED_SIZE, 224, GroupLayout.PREFERRED_SIZE)
.addComponent(mailTextField, GroupLayout.Alignment.LEADING, GroupLayout.PREFERRED_SIZE, 224, GroupLayout.PREFERRED_SIZE)
.addComponent(webTextField, GroupLayout.Alignment.LEADING, GroupLayout.PREFERRED_SIZE, 224, GroupLayout.PREFERRED_SIZE))
.addContainerGap(22, 22));
}
{
commentPanel = new JPanel();
GroupLayout jPanel2Layout = new GroupLayout((JComponent)commentPanel);
commentPanel.setLayout(jPanel2Layout);
commentPanel.setBorder(BorderFactory.createTitledBorder("Comment:"));{
commentScroll = new JScrollPane();
{
commentTextArea = new JTextArea();
commentScroll.setViewportView(commentTextArea);
}
}
jPanel2Layout.setHorizontalGroup(jPanel2Layout.createSequentialGroup().addContainerGap()
.addComponent(commentScroll, 0, 346, Short.MAX_VALUE)
.addContainerGap());
jPanel2Layout.setVerticalGroup(jPanel2Layout.createSequentialGroup()
.addComponent(commentScroll, GroupLayout.PREFERRED_SIZE, 90, GroupLayout.PREFERRED_SIZE)
.addContainerGap());
}
{
buttonPanel = new JPanel();
GroupLayout jPanel3Layout = new GroupLayout((JComponent)buttonPanel);
buttonPanel.setLayout(jPanel3Layout);
{
jButton1 = new JButton();
jButton1.setText("Reset");
jButton1.addActionListener(this);
}
{
submitButton = new JButton();
submitButton.setText("Submit");
submitButton.addActionListener(this);
}

jPanel3Layout.setHorizontalGroup(jPanel3Layout.createSequentialGroup()
.addContainerGap(161, Short.MAX_VALUE)
.addComponent(jButton1, GroupLayout.PREFERRED_SIZE, 102, GroupLayout.PREFERRED_SIZE)
.addPreferredGap(LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(submitButton, GroupLayout.PREFERRED_SIZE, 102, GroupLayout.PREFERRED_SIZE)
.addGap(6));
jPanel3Layout.setVerticalGroup(jPanel3Layout.createSequentialGroup()
.addPreferredGap(LayoutStyle.ComponentPlacement.RELATED, 0, Short.MAX_VALUE)
.addGroup(jPanel3Layout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(jButton1, GroupLayout.Alignment.BASELINE, GroupLayout.PREFERRED_SIZE, 29, GroupLayout.PREFERRED_SIZE)
.addComponent(submitButton, GroupLayout.Alignment.BASELINE, GroupLayout.PREFERRED_SIZE, 29, GroupLayout.PREFERRED_SIZE))
.addContainerGap());
}
thisLayout.setVerticalGroup(thisLayout.createSequentialGroup()
.addContainerGap()
.addComponent(Panel1, GroupLayout.PREFERRED_SIZE, 156, GroupLayout.PREFERRED_SIZE)
.addPreferredGap(LayoutStyle.ComponentPlacement.RELATED)
.addComponent(commentPanel, GroupLayout.PREFERRED_SIZE, 117, GroupLayout.PREFERRED_SIZE)
.addPreferredGap(LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(buttonPanel, 0, 33, Short.MAX_VALUE)
.addContainerGap());
thisLayout.setHorizontalGroup(thisLayout.createSequentialGroup()
.addContainerGap(23, 23)
.addGroup(thisLayout.createParallelGroup()
.addComponent(Panel1, GroupLayout.Alignment.LEADING, GroupLayout.PREFERRED_SIZE, 382, GroupLayout.PREFERRED_SIZE)
.addComponent(commentPanel, GroupLayout.Alignment.LEADING, GroupLayout.PREFERRED_SIZE, 382, GroupLayout.PREFERRED_SIZE)
.addComponent(buttonPanel, GroupLayout.Alignment.LEADING, 0, 382, Short.MAX_VALUE))
.addContainerGap(22, 22));

} catch (Exception e) {
e.printStackTrace();
}
}


@Override
public void actionPerformed(ActionEvent e) {
if(e.getActionCommand().equals("Reset")){
//JOptionPane.showMessageDialog(null,"comment is mandatory!", "Error", JOptionPane.ERROR_MESSAGE);
emptyFields();

}
if(e.getActionCommand().equals("Submit")){
Controller control = new Controller();
try {
control.name_TextField_getText = nameTextField.getText();
control.mail_TextField_getText = mailTextField.getText();
control.web_TextField_getText = webTextField.getText();
control.comment_TextArea_getText = commentTextArea.getText();
control.error = false;
control.writeToXmlFile();
emptyFields();
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}

}
public void emptyFields(){
nameTextField.setText("");
mailTextField.setText("");
webTextField.setText("");
commentTextArea.setText("");
}

}

public interface HtmlConverter {

}
--------------------------------
import javax.swing.JOptionPane;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import java.io.*;
import java.util.Date;

import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.*;
import javax.xml.transform.stream.*;
import org.w3c.dom.*;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

public class Controller {

static private GuestBook guest = new GuestBook();
static private HtmlConverter converter = null;
//xml tags
String fName = "name";
String mail = "mail";
String date = "date";
String web = "web";
String comment = "comment";
//error attribute
public boolean error = false;
//class variables
public String name_TextField_getText = "";
public String mail_TextField_getText = "";
public String web_TextField_getText = "";
public String comment_TextArea_getText = "";
//
// Constructors
//
public Controller () { };

//
// Methods
//
public void writeToXmlFile()throws Exception{
File file = new File("comments.xml");
boolean exist = file.exists();
if(!exist){
sampleComment();
}
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
org.w3c.dom.Document document = documentBuilder.parse("comments.xml");
Element rootElement = document.getDocumentElement();
Element child = (Element)rootElement.getFirstChild();
Element newNode = (Element)child.cloneNode(false);
rootElement.appendChild(newNode);

Element name = document.createElement(fName);
name.appendChild(document.createTextNode(name_TextField_getText));
System.out.println("name filed: "+name_TextField_getText);
if(name_TextField_getText.equals("")){
JOptionPane.showMessageDialog(null,"Please enter Name!", "Error", JOptionPane.ERROR_MESSAGE);
error = true;
//return;
}
newNode.appendChild(name);
// email
Element email = document.createElement(mail);
email.appendChild(document.createTextNode(mail_TextField_getText));
System.out.println("mail: "+mail_TextField_getText);
if(mail_TextField_getText.equals("")){
JOptionPane.showMessageDialog(null,"Please enetr E-mail Address!", "Error", JOptionPane.ERROR_MESSAGE);
error = true;
return;
}

newNode.appendChild(email);
//date
//Date d = new Date();
//Object d1 = (Object)d.getYear();
String d2 = "2008";
System.out.println("Date: "+d2);
Element dat = document.createElement(date);
dat.appendChild(document.createTextNode(d2));
newNode.appendChild(dat);
//web
Element webPage = document.createElement(web);
webPage.appendChild(document.createTextNode(web_TextField_getText));
newNode.appendChild(webPage);
//comment
Element com = document.createElement(comment);
com.appendChild(document.createTextNode(comment_TextArea_getText));
if(comment_TextArea_getText.equals("")){
JOptionPane.showMessageDialog(null,"Please enter comment!", "Error", JOptionPane.ERROR_MESSAGE);
error = true;
return;
}
newNode.appendChild(com);
//writting to file
File file1 = new File("comments.xml");
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
DOMSource source = new DOMSource(document);
StreamResult result = new StreamResult(file1);
transformer.transform(source, result);
}
public void sampleComment()throws Exception{
File file = new File("comments.xml");
String come = "<guestbook>"+
"<comment>"+"<name>shafi</name>"+"<mail>shafi.tokhi@gmail.com</mail>"+
"<date>2008</date>"+"<web>www.xtokhi.googlepages.com</web>"+
"<com>Java Guest Book</com>"+"</comment>"+
"</guestbook>";
org.w3c.dom.Document xmldoc = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(new InputSource(new StringReader(come)));

TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
DOMSource source = new DOMSource(xmldoc);
StreamResult result = new StreamResult(file);
transformer.transform(source, result);
}

private GuestBook getGuest ( ) {
return guest;
}

private HtmlConverter getConverter ( ) {
return converter;
}

}
----------------------------------------------------

Thanks.