logon.java

program for impleting a logon page

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

public class Logon extends JFrame implements ActionListener {

	public Dimension d = Toolkit.getDefaultToolkit().getScreenSize();	
	private int fl=1;
	private JPanel pLog = new JPanel();
	private JLabel lbUser, lbPass;
	private JTextField txtUser;
	private JPasswordField txtPass;
	private JButton btnOk, btnCancel;
	private JRadioButton rad,remp;
	private Connection con;		
	public String user;

	public Logon () {

		super ("Bug Tracking System.");	
		setSize (500, 400);					
		addWindowListener (new WindowAdapter () {		
			public void windowClosing (WindowEvent we) {
				setVisible (false);			
				dispose();            		
				System.exit (0);        	
			}
		});
		
		setLocation (d.width / 2 - getWidth() / 2, d.height / 2 - getHeight() / 2);
		pLog.setLayout (null);
		//Setting the Form's Radio Button's
		rad=new JRadioButton("Admin");
		rad.setBounds(80,140,100,25);
		rad.addActionListener(this);
		
		remp=new JRadioButton("Employee");
		remp.setBounds(80,200,100,25);
		remp.addActionListener(this);
		
		rad.setSelected(true);
		ButtonGroup bg=new ButtonGroup();
		bg.add(rad);
		bg.add(remp);
				
		//Setting the Form's Labels.
		lbUser = new JLabel ("Username:");
		lbUser.setForeground (Color.black);
		lbUser.setBounds (20, 15, 75, 25);
	        lbPass = new JLabel ("Password:");
		lbPass.setForeground (Color.BLACK);
                lbPass.setBounds (20, 50, 75, 25);

		//Setting the Form's TextField & PasswordField.
		txtUser = new JTextField ();
		txtUser.setBounds (100, 15, 150, 25);
		txtPass = new JPasswordField ();
		txtPass.setBounds (100, 50, 150, 25);

		//Setting the Form's Buttons.
		btnOk = new JButton ("OK");
		btnOk.setBounds (20, 90, 100, 25);
		btnOk.addActionListener (this);
		btnCancel = new JButton ("Cancel");
		btnCancel.setBounds (150, 90, 100, 25);
		btnCancel.addActionListener (this);

		//Adding All the Controls in Panel.
		pLog.add(rad);
		pLog.add(remp);
		pLog.add (lbUser);
		pLog.add (lbPass);
		pLog.add (txtUser);
		pLog.add (txtPass);
		pLog.add (btnOk);
		pLog.add (btnCancel);

		//Adding Panel to the Form.
		getContentPane().add (pLog);
		//Opening the Database.
		try {
			Class.forName ("sun.jdbc.odbc.JdbcOdbcDriver");
			String loc = "jdbc:odbc:bugproj";
			con = DriverManager.getConnection (loc);
		}
		catch (ClassNotFoundException cnf)  {
			JOptionPane.showMessageDialog (null, "Driver not Loaded...");
			System.exit (0);
		}
		catch (SQLException sqlex) {
 			JOptionPane.showMessageDialog (null, "Unable to Connect to Database...");
 			System.exit (0);
	 	}
		setVisible (true);//form
	}

	public void actionPerformed (ActionEvent ae) {

		Object obj = ae.getSource();
		if (obj == btnOk) {		//If OK Button Pressed.

			String password = new String (txtPass.getPassword());

			if (txtUser.getText().equals ("")) {
				JOptionPane.showMessageDialog (this, "Provide Username to Logon.");
				txtUser.requestFocus();
			}
			else if (password.equals ("")) {
				txtPass.requestFocus();
				JOptionPane.showMessageDialog (null,"Provide Password to Logon.");
			}
			else {
				String pass;			//To Hold the Password.
				boolean verify = false;		//To Confirm Logon.
				if(fl==1)
				{
					if(txtUser.getText().equals("Admin")&&password.equals("admin"))
				      {
					verify=true;
					//NextPage page=new NextPage();	
					//JLabel label = new JLabel("Welcome: Admin");
  					//page.getContentPane().add("South",label);
					//page.setVisible(true);	
					new BugSystem(1,con);
					setVisible(false);
					dispose();						}
				}
				else
				{
					String tablename=null;
		         		if(fl==2)tablename="employees";
					try {	
					//SELECT Query to Retrieved the Record.

 					String query = "SELECT * FROM " + tablename ;
					//+ " WHERE id = " + Integer.parseInt(txtUser.getText())

 					Statement st = con.createStatement ();		//Creating Statement Object.
		 			ResultSet rs = st.executeQuery (query);		//Executing the Query.
					rs.next();					//Moving Towards the Record.
 					user = rs.getString ("username");		//Storing UserName.
 					pass = rs.getString ("pass");		//Storing Password.
 
 					
					if (txtUser.getText().equals (user) && password.equals (pass)) 
					{
						verify = true;
						//Integer.parseInt(txtUser.getText())
						new BugSystem2 (fl,1,con);	//Show Main Form.
						setVisible (false);		//Hide the Form.
						dispose();            		//Free the System Resources.
					}
					else {
						verify = false;
						JOptionPane.showMessageDialog (this, "Incorrect Information Provided.");
						txtUser.setText ("");
						txtPass.setText ("");
						txtUser.requestFocus ();
					}
				}
				catch (Exception sqlex) {
					if (verify == false) {
						JOptionPane.showMessageDialog (this, "Incorrect excep Information Provided.");
						txtUser.setText ("");
						txtPass.setText ("");
						txtUser.requestFocus ();
					}
				}
			}

		}
		}
		else if (obj == btnCancel) 
		{	
			setVisible (false);
			dispose();
			System.exit (0);
		}
		else if(obj==rad)
		{ fl=1;}
		
		else if(obj==remp)
		{ fl=2;}
	}
	public static void main(String args[])
	{  Logon start=new Logon();  }
}