Password Authentication

[LoudHoward]

Hi,
I am doing a Java assignment, and as part of the spec we have to add simple authentication to access certain functions such as insert update and delete.

I am using Swing and there is a button to access the admin functions. How apply simple username/password authentication (i.e dialog pops up, uname/pword entered and then checked)

Cheers

 

[Vepo]

Hi LoudHoward,
At fist I have to mention that I'm not a GUI expert so there might be much better ways to do this.

I used JDialog and java.awt.TextField for getting password, because I don't know if there is a method to set echoChar in JTextField...

But here is the code to implement Dialog that asks for username and password:
_________________________________________________________

import java.io.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class Passwd extends JFrame
{
public static void main(String[] argv)
{
new Passwd();
}

public Passwd()
{
super("TestFrame"

_dialog = new PWDialog(this, "Password check"

JButton btn = new JButton("pushMe"

btn.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
if(_dialog.authenticate())
System.out.println("Permission granted"
else
System.out.println("Permission denied!"
}
});


Container c = this.getContentPane();

c.add(btn);

this.setSize(100,100);
this.pack();
this.show();
}


class PWDialog extends JDialog
{
public PWDialog(JFrame parent, String title)
{
super(parent, title, true); // Use modal dialog

GridLayout grid = new GridLayout(3,2,0,3); // Define layout

Container c = this.getContentPane();
c.setLayout(grid);

Label lblUser = new Label("UserName"
c.add(lblUser);

_txtUserName = new TextField();
c.add(_txtUserName);

Label lblPasswd = new Label("Password"
c.add(lblPasswd);

_txtPasswd = new TextField();
_txtPasswd.setEchoChar('*');
c.add(_txtPasswd);

_btnOk = new JButton("OK"
_btnOk.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
check(); // Check username & password
}
});
c.add(_btnOk);

_btnCancel = new JButton("Cancel"
_btnCancel.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
check();
}
});
c.add(_btnCancel);

this.setSize(200,100);
this.setResizable(false);
}

private void check()
{
if(_txtUserName.getText().equals("foo&quot && _txtPasswd.getText().equals("bar&quot)
{
_passed = true; // permission granted
}
else
{
_passed = false;
}

_txtPasswd.setText(""
_txtUserName.setText(""
this.hide(); // Hide dialog (returns _passed attribute at authenticate() method)
}

public boolean authenticate()
{
this.show();
return _passed;
}

private TextField _txtUserName;
private TextField _txtPasswd;
private JButton _btnOk;
private JButton _btnCancel;

private boolean _passed = false;
}

private PWDialog _dialog;
}
_________________________________________________________

Accepted Username and Password are hardcoded here, but
you probably want to get them from file or database etc.

I you have further questions, please ask!