Hi, This will show you how to create a login form using swing.
Please be aware that this form does not connect to anything.
( eg. A URL or a database)
This is just a little advanced example of one of the many things you can do in swing.
A working example of this script can be downloaded at:
http://programmers-paradise.net/forum/viewtopic.php?t=9
And Yes before I start getting attacked with accusations of deprecated values I am aware of one in this code.
:rolleyes:
/****************************************************************/
/* login */
/* Copyright 2006 Billy Anderson */
/****************************************************************/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class login extends JFrame
{
// Variables declaration
private JLabel jLabel1;
private JLabel jLabel2;
private JTextField jTextField1;
private JPasswordField jPasswordField1;
private JButton jButton1;
private JPanel contentPane;
// End of variables declaration
public login()
{
super();
create();
this.setVisible(true);
}
private void create()
{
jLabel1 = new JLabel();
jLabel2 = new JLabel();
jTextField1 = new JTextField();
jPasswordField1 = new JPasswordField();
jButton1 = new JButton();
contentPane = (JPanel)this.getContentPane();
//
// jLabel1
//
jLabel1.setHorizontalAlignment(SwingConstants.LEFT);
jLabel1.setForeground(new Color(0, 0, 255));
jLabel1.setText("username:");
//
// jLabel2
//
jLabel2.setHorizontalAlignment(SwingConstants.LEFT);
jLabel2.setForeground(new Color(0, 0, 255));
jLabel2.setText("password:");
//
// jTextField1
//
jTextField1.setForeground(new Color(0, 0, 255));
jTextField1.setSelectedTextColor(new Color(0, 0, 255));
jTextField1.setToolTipText("Enter your username");
jTextField1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
jTextField1_actionPerformed(e);
}
});
//
// jPasswordField1
//
jPasswordField1.setForeground(new Color(0, 0, 255));
jPasswordField1.setToolTipText("Enter your password");
jPasswordField1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
jPasswordField1_actionPerformed(e);
}
});
//
// jButton1
//
jButton1.setBackground(new Color(204, 204, 204));
jButton1.setForeground(new Color(0, 0, 255));
jButton1.setText("Login");
jButton1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
jButton1_actionPerformed(e);
}
});
//
// contentPane
//
contentPane.setLayout(null);
contentPane.setBorder(BorderFactory.createEtchedBorder());
contentPane.setBackground(new Color(204, 204, 204));
addComponent(contentPane, jLabel1, 5,10,106,18);
addComponent(contentPane, jLabel2, 5,47,97,18);
addComponent(contentPane, jTextField1, 110,10,183,22);
addComponent(contentPane, jPasswordField1, 110,45,183,22);
addComponent(contentPane, jButton1, 150,75,83,28);
//
// login
//
this.setTitle("Login To Members Area");
this.setLocation(new Point(76, 182));
this.setSize(new Dimension(335, 141));
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
this.setResizable(false);
}
/** Add Component Without a Layout Manager (Absolute Positioning) */
private void addComponent(Container container,Component c,int x,int y,int width,int height)
{
c.setBounds(x,y,width,height);
container.add(c);
}
private void jTextField1_actionPerformed(ActionEvent e)
{
}
private void jPasswordField1_actionPerformed(ActionEvent e)
{
}
private void jButton1_actionPerformed(ActionEvent e)
{
System.out.println("\njButton1_actionPerformed(ActionEvent e) called.");
String username = new String(jTextField1.getText());
String password = new String(jPasswordField1.getText());
if(username.equals("") || password.equals("")) // If password and username is empty > Do this >>>
{
jButton1.setEnabled(false);
JLabel errorFields = new JLabel("<HTML><FONT COLOR = Blue>You must enter a username and password to login.</FONT></HTML>");
JOptionPane.showMessageDialog(null,errorFields);
jTextField1.setText("");
jPasswordField1.setText("");
jButton1.setEnabled(true);
this.setVisible(true);
}
else
{
JLabel optionLabel = new JLabel("<HTML><FONT COLOR = Blue>You entered</FONT><FONT COLOR = RED> <B>"+username+"</B></FONT> <FONT COLOR = Blue>as your username.<BR> Is this correct?</FONT></HTML>");
int confirm =JOptionPane.showConfirmDialog(null,optionLabel);
switch(confirm){ // Switch > Case
case JOptionPane.YES_OPTION: // Attempt to Login user
jButton1.setEnabled(false); // Set button enable to false to prevent 2 login attempts
break;
case JOptionPane.NO_OPTION: // No Case.(Go back. Set text to 0)
jButton1.setEnabled(false);
jTextField1.setText("");
jPasswordField1.setText("");
jButton1.setEnabled(true);
break;
case JOptionPane.CANCEL_OPTION: // Cancel Case.(Go back. Set text to 0)
jButton1.setEnabled(false);
jTextField1.setText("");
jPasswordField1.setText("");
jButton1.setEnabled(true);
break;
} // End Switch > Case
}
}
public static void main(String[] args)
{
JFrame.setDefaultLookAndFeelDecorated(true);
JDialog.setDefaultLookAndFeelDecorated(true);
try
{
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
}
catch (Exception ex)
{
System.out.println("Failed loading L&F: ");
System.out.println(ex);
}
new login();
};
}
hi this is great please cud u help me out here ...
i did mine entirely before i saw urs but the thin is that when i trying to login nothing happends afterjavackin appleviewer Login.java
it cums up but if i login with a user name and password its does not perfom any action i dont know why please it is very important that u help me..
here is the code snipet.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;
import java.io.*;
import java.util.*;
/*
<applet code="Login.class" height=300 width=300>
</applet>
*/
public class Login extends JApplet implements ActionListener
{
/*D V*/
JPanel panel;
JFrame frame;
JLabel lo;
JLabel bo;
JLabel so;
JLabel title,title2;
JTextField bu;
JPasswordField wu;
JButton l;
JButton c;
JButton w;
GridBagLayout g;
GridBagConstraints gbc;
public void init()
{
/*I L V*/
g=new GridBagLayout();
gbc=new GridBagConstraints();
panel=(JPanel)getContentPane();
panel.setLayout(g);
/*A C P*/
lo=new JLabel("Login ID:");
gbc.ipady=2;
gbc.ipadx=2;
gbc.gridx=0;
gbc.gridy=4;
g.setConstraints(lo, gbc);
panel.add(lo);
lo.setForeground(Color.red);
lo.setBackground(Color.yellow);
panel.setBackground(Color.yellow);
bu=new JTextField(15);
gbc.ipady=2;
gbc.ipadx=2;
gbc.gridx=1;
gbc.gridy=4;
g.setConstraints(bu, gbc);
panel.add(bu);
/*A C P*/
bo=new JLabel("Password:");
bo.setForeground(Color.red);
gbc.ipady=2;
gbc.ipadx=2;
gbc.gridx=0;
gbc.gridy=5;
g.setConstraints(bo, gbc);
panel.add(bo);
wu=new JPasswordField(15);
gbc.ipady=2;
gbc.ipadx=2;
gbc.gridx=1;
gbc.gridy=5;
g.setConstraints(wu, gbc);
panel.add(wu);
/*A C P*/
w=new JButton("Cancel");
gbc.ipady=2;
gbc.ipadx=2;
gbc.gridx=1;
gbc.gridy=6;
g.setConstraints(w, gbc);
panel.add(w);
/*A C P*/
l=new JButton("Exit");
gbc.ipady=2;
gbc.ipadx=2;
gbc.gridx=2;
gbc.gridy=6;
g.setConstraints(l, gbc);
panel.add(l);
/*A C P*/
so=new JLabel("Music On Web");
so.setBackground(Color.yellow);
gbc.gridx=1;
gbc.gridy=0;
g.setConstraints(so, gbc);
panel.add(so);
/*A C P*/
c=new JButton("Login");
gbc.ipady=2;
gbc.ipadx=2;
gbc.gridx=0;
gbc.gridy=6;
g.setConstraints(c, gbc);
panel.add(c);
c.addActionListener(this);
l.addActionListener(this);
w.addActionListener(this);
}
public void actionPerformed(ActionEvent ae)
{
if(ae.getActionCommand() == "Exit")
System.exit(0);
Object o=ae.getSource();
if(o==w)
{
bu.setText("");
wu.setText("");
}
if(o==c)
{
String tu=bu.getText();
if(tu.length()==0){
JOptionPane.showMessageDialog(this,new
String("LoginID can't be blank"));}
}
if(o==c)
{
String tu=wu.getText();
if(tu.length()==0){
JOptionPane.showMessageDialog(this,new
String("Enter ur password"));
return;}
}
if(c==o)
{
String s="name: " +bu.getText()+ " password: " +wu.getText();
try
{
RandomAccessFile lFile=new RandomAccessFile("log.txt","rw");
lFile.seek(lFile.length());
lFile.writeBytes(s);
} catch(IOException ie)
{
showStatus("unable to write" +ie);
}
if(c==o)
{
The myadd = new The();
/*start changes*/
myadd.init();
myadd.start();
int compCount = panel.getComponentCount();
java.util.Vector componentList = new java.util.Vector();
for(int i = 0; i < compCount; i++)
{
Component c = panel.getComponent(i);
componentList.addElement(c);
}
for(int i = 0; i < componentList.size(); i++)
{
Component c = (Component)componentList.elementAt(i);
panel.remove(c);
}
panel.add(myadd);
//use this method for thread safety
java.awt.EventQueue.invokeLater(new Runnable()
{
public void run() {
javax.swing.SwingUtilities.updateComponentTreeUI(Login.this);
}
});
/*end changes*/
}
}
}
}
please tell me the code of login form
thanks for this informative posting. its really useful for me. this forum contain very useful information. i like it very much.
nice.i got the output for that aftr correctin some mistakes comparing urs.........i d like to have codes for some other standard applications like applets.....etc.so wer can i get it. or else can u post tht here....pls .i m fond on getting the codes from ur site....
hello ! please send me the code for login on my id
please send me the code for login on my id
----------------------------------------
quang cao online | quang cao
please send me the code for login on my id
----------------------------------------
quang cao online | quang cao
Thread Closed as it is old and has now become a simple dumping spot for "Give me teh codez" responses. No, thank you.
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