Can someone please help

[Dan Ush]

Hello everyone.. I am having a little problem and I can't quite figure it out

I am trying to make a simple GUI which asks for username/password.. sends that information to check against database.. if its true come back .. clear the contents of the frame and start building the client side app ( I am not quite sure how to do this part ). Do I ask for the username/password in a dialog and then full client app in a frame? or have username/password in a frame and then dialog for full client app?

Here is what I have...

import javax.swing.*;
import java.sql.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.*;

public class Client extends JFrame {
	JTextArea text;
	
	private ImageIcon image1;
	private JLabel label1;
	private JTextField utxtfield;
	private JPasswordField ptxtfield;

	public Client() {
		image1= new ImageIcon(getClass().getResource("logo.jpg"));
		label1 = new JLabel(image1);
		JLabel ulabel = new JLabel("Username: ");
		JLabel plabel = new JLabel("Password: ");
		
		utxtfield = new JTextField("",10);
		ptxtfield = new JPasswordField("",10);
		
		JButton button = new JButton("Login");
		LoginListener e = new LoginListener();
		button.addActionListener(e);
		
		Container contentPane = getContentPane();
		SpringLayout layout = new SpringLayout();
		contentPane.setLayout(layout);
		// contentPane.add(button);
		contentPane.add(label1);
		contentPane.add(ulabel);
		contentPane.add(plabel);
		contentPane.add(utxtfield);
		contentPane.add(ptxtfield);
		contentPane.add(button);

		// Adjust Constraints
		
		layout.putConstraint(SpringLayout.WEST, label1, 5, SpringLayout.WEST, contentPane);
		layout.putConstraint(SpringLayout.NORTH, label1, 0, SpringLayout.NORTH, contentPane);
		
		layout.putConstraint(SpringLayout.WEST, ulabel, 0, SpringLayout.WEST, contentPane);
		layout.putConstraint(SpringLayout.NORTH, ulabel, 50, SpringLayout.NORTH, contentPane);
		
		layout.putConstraint(SpringLayout.WEST, utxtfield, 70, SpringLayout.WEST, ulabel);
		layout.putConstraint(SpringLayout.NORTH, utxtfield, 50, SpringLayout.NORTH, contentPane);
		
		layout.putConstraint(SpringLayout.WEST, plabel, 0, SpringLayout.WEST, contentPane);
		layout.putConstraint(SpringLayout.NORTH, plabel, 20, SpringLayout.NORTH, ulabel);
		
		layout.putConstraint(SpringLayout.WEST, ptxtfield, 70, SpringLayout.WEST, plabel);
		layout.putConstraint(SpringLayout.NORTH, ptxtfield, 20, SpringLayout.NORTH, utxtfield);
		
		layout.putConstraint(SpringLayout.WEST, button, 70, SpringLayout.WEST, contentPane);
		layout.putConstraint(SpringLayout.NORTH, button, 40, SpringLayout.NORTH, utxtfield);
	}		
	
	class LoginListener implements ActionListener {
		public void actionPerformed(ActionEvent ev){
			if(utxtfield.getText().trim().length() == 0){
				JOptionPane.showMessageDialog(null, "Please enter your usename");
			}else {
				try {
					String uholder = utxtfield.getText();
					String pholder = new String(ptxtfield.getPassword());
				
				// This is the dialog that opens once you hit Login
				/*	LoginWindow loginGUI = new LoginWindow(Client.this);
					loginGUI.setDefaultCloseOperation(JDialog.HIDE_ON_CLOSE);
					loginGUI.setSize(200,150);
					loginGUI.setLocation(400,200);
					loginGUI.setVisible(true);
					loginGUI.setTitle("Connecting..");
					*/

					//JBDC
					try{
							Class.forName("com.mysql.jbdc.Driver");
							Connection con = DriverManager.getConnection("jbdc:mysql://localost:8080/testdb", "testdb","testdb123");
							PreparedStatement statement = con.prepareStatement("select * from name");
							ResultSet rs= statement.executeQuery("select * from UID");
						    while (rs.next()) {  						           
								 if (uholder == rs.getString("users_name")) {  
								       if (pholder == rs.getString("users_password")) {  
								            System.out.println("Logged in!");  
								       
// additional processing    
								       } else {  
								                 System.out.println("Password did not match username!");  
								                 }  
								            } else {  
								                 System.out.println("Username did not match the database");  
								            }  
							statement.close();
						}
					}catch (SQLException ex){
								ex.printStackTrace();
							}catch (ClassNotFoundException ex){
								ex.printStackTrace();
							}						
					}catch (Exception ex){ex.printStackTrace();}
			}
			}
		}
	
	public static void main(String[] args){
		
		Client gui = new Client();
		gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		gui.setSize(200,150);
		gui.setTitle("Login");
		gui.pack();
		gui.setVisible(true);
	}

ANd this is the LoginWindow() code

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

public class LoginWindow extends JDialog {
	
	JTextArea text;
	private ImageIcon image1;
	private JLabel label1;
	
	public LoginWindow(JFrame frame){
		super(frame, "Connecting..", true);
		setLayout(new SpringLayout());
		image1= new ImageIcon(getClass().getResource("logo.jpg"));
		label1 = new JLabel(image1);
		JLabel ulabel = new JLabel("Autherizing..");
		
		Container contentPane = getContentPane();
		SpringLayout layout = new SpringLayout();
		contentPane.setLayout(layout);
		contentPane.add(label1);
		contentPane.add(ulabel);
	
		// Adjust Constraints
		layout.putConstraint(SpringLayout.WEST, ulabel, 50, SpringLayout.WEST, contentPane);
		layout.putConstraint(SpringLayout.NORTH, ulabel, 50, SpringLayout.NORTH, contentPane);
			}
}

Feedback appreciated

[Campbell Ritchie]

Welcome to the Ranch
You might have got a quicker reply with a more informative thread title.

A dialog sounds a good way to enter a password. Remember you may have to encrypt the password if you are passing it across a network.

Other people will have different opinions.

[Ranganathan Kaliyur Mannar]

yah, JDialog is the right fit for username/password. You can initially just launch the dialog and check the credentials. If the credentials are not good or if there are validation errors, user can return to the dialog to re-enter. If login is successful, you just call dialog.dispose() and build a frame and show it.