Student in distress: Read data from text file to fill a JTable

Question

I'm already late 2 weeks for my project and I still can't figure this out :(
The project is made of 3 classes; the main one is Viewer.java; it creates the interface, Menu.java that manages the menu and the methods related to it and finally JTableData.java that extends JTable ( This is the part that I don't really understand)
In the class MENU.JAVA I wrote the method jMenuOpen_actionPerformed(...) for the button OUVRIR (Open) that let's me select the file to read, then puts the content in a 2D table. Here' s my problem: I have to somehow update the content of the table created in VIEWER.JAVA with the content read from the file (cvs file delimited by ";") using a JTableData object (?)
//THIS IS THE FIRST CLASS VIEWER.JAVA THAT CONTAINS THE MAIN METHOD
//AND CREATES THE INTERFACE
package viewer;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Viewer extends JFrame {
  public Menu menu = null;
  GridLayout gridLayout1 = new GridLayout();
  JTabbedPane jTabbedPane = new JTabbedPane();             
  JTableData jTableInfo = new JTableData(30, 7);
  public Viewer() {
          addWindowListener(new WindowAdapter()
          {               public void windowClosing(WindowEvent e)
                    dispose();
                    System.exit(0);
        try 
            jbInit();
            this.setSize(1000, 700);
            this.setVisible(true);
        catch(Exception e)
            e.printStackTrace();
  public static void main(String[] args) {
      Viewer viewer = new Viewer();
  private void jbInit() throws Exception {
    menu = new Menu(this);
    gridLayout1.setColumns(1);
    this.setTitle("Viewer");
    this.getContentPane().setLayout(gridLayout1);
    jTableInfo.setMaximumSize(new Dimension(0, 64));
    jTableInfo.setPreferredSize(new Dimension(0, 64));
    //TO DO Partie de droite
    JTabbedPane webViewerTabs = new JTabbedPane();
    //972 3299
    //java.net.URL URL1 = new java.net.URL("http://www.nba.com");
    //java.net.URL URL2 = new java.net.URL("http://www.insidehoops.com");
    //java.net.URL URL3 = new java.net.URL("http://www.cnn.com");
    JEditorPane webViewer01 = new JEditorPane();
    webViewer01.setEditable(false);
    //webViewer01.setPage(URL1);
    JEditorPane webViewer02 = new JEditorPane();
    webViewer02.setEditable(false);
    //webViewer02.setPage(URL2);
    JEditorPane webViewer03 = new JEditorPane();
    webViewer03.setEditable(false);
    //webViewer03.setPage(URL3);
    webViewerTabs.addTab("Site01", webViewer01);
    webViewerTabs.addTab("Site02", webViewer02);
    webViewerTabs.addTab("Site03", webViewer03);
    jTabbedPane.add(webViewerTabs);
        //End TO DO   
    this.getContentPane().add(jTableInfo);
    this.getContentPane().add(jTabbedPane);
    this.setJMenuBar(menu);  
//This is the MENU.JAVA CLASS WHERE I OPEN THE FILE, READ THE
//CONTENT AND WHERE I SHOULD SEND THE DATA TO THE TABLE.
//Title:        Menu
//Author:       Luc Duong
package viewer;
import javax.swing.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
public class Menu extends JMenuBar {
  JMenu jMenu1 = new JMenu();
  JMenuItem jMenuNew = new JMenuItem();
  JMenuItem jMenuOpen = new JMenuItem();
  JMenuItem jMenuSave = new JMenuItem();
  JMenuItem jMenuExit = new JMenuItem();
  JMenuItem jMenuApropos = new JMenuItem();
  JFileChooser fileChooser = new JFileChooser();
  Viewer viewer = null;
  boolean isFileChanged = false;
  private File fileName;
  static String data [][] = new String[7][9];
  public int lineCount;
  public Menu(Viewer viewer) {
    try  {
      jbInit();
      this.viewer = viewer;
      this.add(jMenu1);
    catch(Exception e) {
      e.printStackTrace();
  private void jbInit() throws Exception {
    jMenu1.setText("Fichier");
    jMenuNew.setText("Nouveau");
    jMenuNew.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        jMenuNew_actionPerformed(e);
    jMenuOpen.setText("Ouvrir");
    jMenuOpen.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        jMenuOpen_actionPerformed(e);
    jMenuSave.setText("Sauvegarder");
    jMenuSave.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        jMenuSave_actionPerformed(e);
    jMenuExit.setText("Quitter");
    jMenuExit.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        jMenuExit_actionPerformed(e);
    jMenuApropos.setText("A propos");
    jMenuApropos.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        jMenuApropos_actionPerformed(e);
    jMenu1.add(jMenuNew);
    jMenu1.add(jMenuOpen);
    jMenu1.add(jMenuSave);
    jMenu1.add(jMenuExit);       
    jMenu1.add(jMenuApropos);   
  void jMenuNew_actionPerformed(ActionEvent e) {
  //THIS IS THE METHOD I'M WORKING ON RIGHT NOW
  void jMenuOpen_actionPerformed(ActionEvent e) {
      fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
      int result = fileChooser.showOpenDialog(this);
      if (result == JFileChooser.CANCEL_OPTION) return;
      if (result == JFileChooser.APPROVE_OPTION)
          //[email protected]
          File chosenFile = fileChooser.getSelectedFile();
          String path = chosenFile.getPath();
          String nom = chosenFile.getName();
          boolean exist = chosenFile.exists();
          try
            FileReader fr = new FileReader(chosenFile);
            BufferedReader reader = new BufferedReader(fr);
            System.out.println("Opening File Successful!" + chosenFile.getName());
            //String  qui contient la ligne courante
            String currentLine = new String();
            StringTokenizer currentLineTokens = new StringTokenizer("");
            int row = 0;
            int column = 0;
            while( (currentLine = reader.readLine() ) != null)
                currentLineTokens = new StringTokenizer(currentLine,";");
                System.out.println("Now reading line index: " + row);
                while(currentLineTokens.hasMoreTokens())
                    data[row][column] = currentLineTokens.nextToken();
                    System.out.println(column + "\t" + data[row][column]);
                    if(column>=8) column=-1;
                    column++;
                row++;
            lineCount = row-1;
            System.out.println("\nNombre total de lignes: " + lineCount);
        catch(Exception ex)
            System.out.println("Test: " + ex.getMessage());
            JOptionPane.showMessageDialog(this, "Erreur d'ouverture du fichier", "Erreur d'ouverture du fichier", JOptionPane.ERROR_MESSAGE);
  void jMenuSave_actionPerformed(ActionEvent e) {
      if (JFileChooser.APPROVE_OPTION == fileChooser.showSaveDialog(this))
            System.err.println("Save: " + fileChooser.getSelectedFile().getPath());     
  void jMenuExit_actionPerformed(ActionEvent e) {
    if (!isFileChanged)
       System.exit(1);
    else
        JOptionPane.showConfirmDialog(null, "Do you want to save now?", "Save?", JOptionPane.YES_NO_OPTION);
      // ask the user if he want to save
      // yes or no?
      // yes
       jMenuSave_actionPerformed(e);
      // no
      System.exit(1);
  void jMenuApropos_actionPerformed(ActionEvent e) {
//THIS IS THE JTABLEDATA.JAVA CLASS THAT EXTENDS JTable. I'm not sure
// how this works :(//Title: JTableData
//Author: Luc Duong
package viewer;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class JTableData extends JTable {
public JTableData(int row, int col)
super(row, col);

Answer 1

Hi, Salut
you should use JTable's DataModel to update your table.
data[row][column] = currentLineTokens.nextToken();
jTableInfo.getModel().setValueAt(data[row][column], row, column);
jTableInfo.repaint();BEWARE CSV files and StringTokenizer, i've had problems with it (for example ;;Test; is not tokenized "", "", "Test")
StringTokenizer ignores separator when in first position, and ignores double separators. I use this piece of code before tokenize a String :
private static char _separator = ';';
private static String checkCsvString(String s) {
         * V�rification du s�parateur inital, perdu par le StringTokenizer et
         * pourtant bien important
        if (s.startsWith("" + _separator)) {
            s = " " + s;
         * V�rification des doubles s�parateurs, perdus par le StringTokenizer
        int index;
        while ((index = s.indexOf("" + _separator + _separator)) >= 0) {
            s = s.substring(0, index) + _separator + " " + _separator + s.substring(index + 2);
        return s;
    }hope it helps
Nico