I'm new to java and I have a text file like this
0786160384|P. K.|Tharindu|912921549v|Colombo|
0711495765|P. K.|Gamini|657414589v|Colombo|
0114756199|H. P.|Weerasigha|657895478v|Kandy|
I want to populate my 'jTable' with with the data from this text file. below is my code so far which doesn't work. When I execute the program nothing is displayed on the table.
private void formWindowOpened(java.awt.event.WindowEvent evt) {
String line = null;
DefaultTableModel dtm = (DefaultTableModel) PhoneBookTable.getModel();
try {
BufferedReader br = new BufferedReader(new FileReader(file));
StringTokenizer st1 = new StringTokenizer(br.readLine(), "|");
while (st1.hasMoreTokens()) {
columns.addElement(st1.nextToken());
}
while ((line = br.readLine()) != null) {
StringTokenizer st2 = new StringTokenizer(line, "|");
while (st2.hasMoreTokens()) {
data.addElement(st2.nextToken());
}
}
br.close();
dtm.addRow(new Object[]{columns, data});//add here
} catch (Exception e) {
e.printStackTrace();
}
}
Can someone please help me?
below is my whole code
package Geo;
import java.awt.Desktop;
import java.io.BufferedReader;
import java.io.IOException;
import javax.swing.ImageIcon;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
import javax.swing.JTable;
import javax.swing.table.TableModel;
import java.text.*;
import java.io.File;
import java.io.FileWriter;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.StringTokenizer;
import java.util.Vector;
import javax.swing.table.DefaultTableModel;
public class PrintGUI extends javax.swing.JFrame {
File file, tempFile;
FileReader fileReader;
FileWriter fileWriter;
ArrayList ClientList;
Vector data;
Vector columns;
public PrintGUI() {
initComponents();
this.setIconImage(new ImageIcon(getClass().getResource("/Images/icon.png")).getImage());
file = new File("C:\\Users\\Tharindu\\Documents\\NetBeansProjects\\Geo phonebook\\phonebook.txt");
tempFile = new File("C:\\Users\\Tharindu\\Documents\\NetBeansProjects\\Geo phonebook\\tempphonebook.txt");
}
public void toExcel(JTable PhoneBook, File file) {
try {
TableModel model = PhoneBook.getModel();
FileWriter excel = new FileWriter(file);
for (int i = 0; i < model.getColumnCount(); i++) {
excel.write(model.getColumnName(i) + "\t");
}
excel.write("\n");
for (int i = 0; i < model.getRowCount(); i++) {
for (int j = 0; j < model.getColumnCount(); j++) {
excel.write(model.getValueAt(i, j).toString() + "\t");
}
excel.write("\n");
}
excel.close();
} catch (IOException e) {
System.out.println(e);
}
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
Export2ExcelButton = new javax.swing.JButton();
Export2Text = new javax.swing.JButton();
PrintButton = new javax.swing.JButton();
jScrollPane1 = new javax.swing.JScrollPane();
PhoneBookTable = new javax.swing.JTable();
Background = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
setTitle("Print");
setResizable(false);
addWindowListener(new java.awt.event.WindowAdapter() {
public void windowOpened(java.awt.event.WindowEvent evt) {
formWindowOpened(evt);
}
});
getContentPane().setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());
Export2ExcelButton.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Images/Logos-Excel-icon.png"))); // NOI18N
Export2ExcelButton.setText("Export to Excel");
Export2ExcelButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
Export2ExcelButtonActionPerformed(evt);
}
});
getContentPane().add(Export2ExcelButton, new org.netbeans.lib.awtextra.AbsoluteConstraints(20, 350, 130, 30));
Export2Text.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Images/File-TXT-icon.png"))); // NOI18N
Export2Text.setText("Export to Text");
Export2Text.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
Export2TextActionPerformed(evt);
}
});
getContentPane().add(Export2Text, new org.netbeans.lib.awtextra.AbsoluteConstraints(160, 350, 130, 30));
PrintButton.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Images/Print-icon.png"))); // NOI18N
PrintButton.setText("Print");
PrintButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
PrintButtonActionPerformed(evt);
}
});
getContentPane().add(PrintButton, new org.netbeans.lib.awtextra.AbsoluteConstraints(450, 350, 130, 30));
PhoneBookTable.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
{null, null, null, null, null},
{null, null, null, null, null},
{null, null, null, null, null},
{null, null, null, null, null},
{null, null, null, null, null},
{null, null, null, null, null},
{null, null, null, null, null},
{null, null, null, null, null},
{null, null, null, null, null},
{null, null, null, null, null},
{null, null, null, null, null},
{null, null, null, null, null},
{null, null, null, null, null},
{null, null, null, null, null},
{null, null, null, null, null},
{null, null, null, null, null},
{null, null, null, null, null},
{null, null, null, null, null},
{null, null, null, null, null},
{null, null, null, null, null},
{null, null, null, null, null},
{null, null, null, null, null},
{null, null, null, null, null},
{null, null, null, null, null},
{null, null, null, null, null}
},
new String [] {
"Phone No", "First Name", "Last Name", "NIC", "City"
}
) {
Class[] types = new Class [] {
java.lang.String.class, java.lang.String.class, java.lang.String.class, java.lang.String.class, java.lang.Object.class
};
public Class getColumnClass(int columnIndex) {
return types [columnIndex];
}
});
PhoneBookTable.setSelectionBackground(new java.awt.Color(255, 255, 0));
PhoneBookTable.setSelectionForeground(new java.awt.Color(51, 51, 51));
jScrollPane1.setViewportView(PhoneBookTable);
getContentPane().add(jScrollPane1, new org.netbeans.lib.awtextra.AbsoluteConstraints(20, 20, 560, 310));
Background.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Images/background.jpg"))); // NOI18N
getContentPane().add(Background, new org.netbeans.lib.awtextra.AbsoluteConstraints(0, 0, 600, 400));
pack();
setLocationRelativeTo(null);
}// </editor-fold>
private void Export2ExcelButtonActionPerformed(java.awt.event.ActionEvent evt) {
try {
JFileChooser fc = new JFileChooser();
int option = fc.showSaveDialog(PrintGUI.this);
if (option == JFileChooser.APPROVE_OPTION) {
try {
String filename = fc.getSelectedFile().getName();
String path = fc.getSelectedFile().getParentFile().getPath();
int len = filename.length();
String ext = "";
String file = "";
if (len > 4) {
ext = filename.substring(len - 4, len);
}
if (ext.equals(".xls")) {
file = path + "\\" + filename;
} else {
file = path + "\\" + filename + ".xls";
}
toExcel(PhoneBookTable, new File(file));
int answer = JOptionPane.showConfirmDialog(null, "Would you like to open the exported file?", "Successfully exported!", option);
if (answer == JOptionPane.YES_OPTION) {
try {
Desktop dt = Desktop.getDesktop();
dt.open(new File(file));
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
}
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
}
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
}
private void PrintButtonActionPerformed(java.awt.event.ActionEvent evt) {
MessageFormat header = new MessageFormat("Phone Book");
MessageFormat footer = new MessageFormat("Page{0,number,integer}");
try {
PhoneBookTable.print(JTable.PrintMode.NORMAL, header, footer);
} catch (java.awt.print.PrinterException e) {
System.err.format("Cannot print %s$n", e.getMessage());
}
}
private void Export2TextActionPerformed(java.awt.event.ActionEvent evt) {
try {
JFileChooser fc = new JFileChooser();
int option = fc.showSaveDialog(PrintGUI.this);
if (option == JFileChooser.APPROVE_OPTION) {
try {
String filename = fc.getSelectedFile().getName();
String path = fc.getSelectedFile().getParentFile().getPath();
int len = filename.length();
String ext = "";
String file = "";
if (len > 4) {
ext = filename.substring(len - 4, len);
}
if (ext.equals(".txt")) {
file = path + "\\" + filename;
} else {
file = path + "\\" + filename + ".txt";
}
FileWriter fw = new FileWriter(file);
BufferedWriter bw = new BufferedWriter(fw);
bw.write("Phone No First Name Last Name NIC City");
bw.newLine();
bw.write("-----------------------------------------------------------");
bw.newLine();
for (int i = 0; i < PhoneBookTable.getRowCount(); i++) {
for (int j = 0; j < PhoneBookTable.getColumnCount(); j++) {
bw.write(PhoneBookTable.getModel().getValueAt(i, j) + " ");
}
bw.newLine();
}
bw.close();
fw.close();
int answer = JOptionPane.showConfirmDialog(null, "Would you like to open the exported file?", "Successfully exported!", option);
if (answer == JOptionPane.YES_OPTION) {
try {
Desktop dt = Desktop.getDesktop();
dt.open(new File(file));
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
}
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
}
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
}
private void formWindowOpened(java.awt.event.WindowEvent evt) {
String line = null;
DefaultTableModel dtm = (DefaultTableModel) PhoneBookTable.getModel();
try {
BufferedReader br = new BufferedReader(new FileReader(file));
StringTokenizer st1 = new StringTokenizer(br.readLine(), "|");
while (st1.hasMoreTokens()) {
columns.addElement(st1.nextToken());
}
while ((line = br.readLine()) != null) {
StringTokenizer st2 = new StringTokenizer(line, "|");
while (st2.hasMoreTokens()) {
data.addElement(st2.nextToken());
}
}
br.close();
dtm.addRow(new Object[]{columns, data});//add here
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(PrintGUI.class
.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(PrintGUI.class
.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(PrintGUI.class
.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(PrintGUI.class
.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
//</editor-fold>
//</editor-fold>
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new PrintGUI().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JLabel Background;
private javax.swing.JButton Export2ExcelButton;
private javax.swing.JButton Export2Text;
private javax.swing.JTable PhoneBookTable;
private javax.swing.JButton PrintButton;
private javax.swing.JScrollPane jScrollPane1;
// End of variables declaration
}
you need to change your to something like this.you need to reset vector data = new Vector(); each time when you read new line otherwise it contain first row + second row + so on.and also you can call dtm.setRowCount(0); to avoid empty initial rows . and you need only to add rows the problem of your comment[cell contain lot of columns] is because of
dtm.addRow(new Object[]{columns, data}) use dtm.addRow(data); instead and problem will be fixed
code
private void formWindowOpened(java.awt.event.WindowEvent evt) {
String line = null;
DefaultTableModel dtm = (DefaultTableModel) PhoneBookTable.getModel();
try {
BufferedReader br = new BufferedReader(new FileReader(file));
while ((line = br.readLine()) != null) {
data = new Vector();// this is important
StringTokenizer st1 = new StringTokenizer(line, "|");
while (st1.hasMoreTokens()) {
String nextToken = st1.nextToken();
data.add(nextToken);
System.out.println(nextToken);
}
System.out.println(data);
dtm.addRow(data);//add here
System.out.println(".................................");
}
br.close();
} catch (Exception e) {
e.printStackTrace();
}
}
output>>
来源：https://stackoverflow.com/questions/31003828/populate-a-jtable-with-values-from-a-txt-file