I have data saved in txt file. I have loaded them in a jtable in one of my forms and I want to be able to edit the txt file using buttons in the GUI form. Also if you can tell me why I have empty lines appearing in the jtable that will be very helpful.
private void delbtnActionPerformed(java.awt.event.ActionEvent evt) {
}
private void modifybtnActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void newpassActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void newusernameActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
here is the view button code
private void viewbtnActionPerformed(java.awt.event.ActionEvent evt) {
try{
BufferedReader br = new BufferedReader(new FileReader("logindata.txt"));
String firstLine = br.readLine().trim();
String[] columnsName = firstLine.split("/");
DefaultTableModel model = (DefaultTableModel)datatable.getModel();
model.setColumnIdentifiers(columnsName);
Object[] tableLines = br.lines().toArray();
for(int i = 0; i < tableLines.length; i )
{
String line = tableLines[i].toString().trim();
String[] dataRow = line.split(",");
model.addRow(dataRow);
}
}
catch(Exception ep){
Logger.getLogger(people_info.class.getName()).log(Level.SEVERE, null, ep);
}
}
here is how I saved data in txt file
private void submitbtnActionPerformed(java.awt.event.ActionEvent evt) {
String user = usertxt.getText();
String pass = passwordtxt.getText();
try
{
FileOutputStream ldata = new FileOutputStream("logindata.txt", true);
PrintWriter printer = new PrintWriter(ldata);
printer.println(user "," pass "," "," ",");
JOptionPane.showMessageDialog(null,"success, please login");
printer.close();
this.setVisible(false);
login lg = new login();
lg.setVisible(true);
}
catch(Exception e)
{
JOptionPane.showMessageDialog(null,"Error, please retry");
}
}
CodePudding user response:
after model.setColumnIdentifiers(columnsName);
add model.setRowCount(0);