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READER LEVEL:ARTICLE
Login Form in Windows Form Using Swing in Java
By Sandeep Sharma on Nov 13, 2013
This article explains how to create a User Login in a Windows Forms application using the Swing concept of Java. The NetBeans IDE is used to create this application.
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Introduction

This article explains how to create a User Login in a Windows Forms application using the Swing concept of Java. The NetBeans IDE is used to create this application.

User Login App

For creating this app we need the following files:

Java file
SQL table
ojdbc.jar file
1. Login.java

This Java file consists of all the logic. First of all we initialize JFrame components using a constructor, then create a database connection and finally set the database value to the textfield. If the given name is not found in the database then it displays an error message and displays it by running the constructor.

2. reg.sql

For fetching records we need a database table; for that we create a "reg" table in our database.

Syntax

reg.sql

create table emp
 (
    name varchar2(30), email varchar2(40),
    pass varchar2(30), count varchar2(30),
    state varchar2(30), phone number(15)
 );

Insert some rows in it

1. insert into emp values ('Sandeep', 'sandy05.1991@gmail.com', 'welcome', 'India','U.P','9717789441');

2. insert into emp values ('rahul', 'rahul@gmail.com' , '1234', 'India','U.P','9015909090');

Now let's start creating this app. Use the following procedure to do that in the NetBeans IDE.

Step 1

Open the NetBeans IDE.

NetBeans IDE

Step 2

Choose "Java" -> "Java application" as shown below

Java Applications

Step 3

Provide the project the name "LoginApp" as in the following.

LoginApp

Step 4

Create a Java class named "Login" with the following code.

Login.java

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
 
public class Login extends JFrame implements ActionListener
{
    JLabel l1, l2, l3;
    JTextField tf1;
    JButton btn1;
    JPasswordField p1;
 
    Login()
    {
        setTitle("Login Form in Windows Form");
        setVisible(true);
        setSize(800, 800);
        setLayout(null);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
        l1 = new JLabel("Login Form in Windows Form:");
        l1.setForeground(Color.blue);
        l1.setFont(new Font("Serif", Font.BOLD, 20));
 
        l2 = new JLabel("Enter Email:");
        l3 = new JLabel("Enter Password:");
        tf1 = new JTextField();
        p1 = new JPasswordField();
        btn1 = new JButton("Submit");
 
        l1.setBounds(100, 30, 400, 30);
        l2.setBounds(80, 70, 200, 30);
        l3.setBounds(80, 110, 200, 30);
        tf1.setBounds(300, 70, 200, 30);
        p1.setBounds(300, 110, 200, 30);
        btn1.setBounds(150, 160, 100, 30);
 
        add(l1);
        add(l2);
        add(tf1);
        add(l3);
        add(p1);
        add(btn1);
        btn1.addActionListener(this);
    }
 
    public void actionPerformed(ActionEvent e)
    {
        showData();
    }
 
    public void showData()
    {
        JFrame f1 = new JFrame();
        JLabel l, l0;
 
        String str1 = tf1.getText();
        char[] p = p1.getPassword();
        String str2 = new String(p);
        try
        {
            Class.forName("oracle.jdbc.driver.OracleDriver");
            Connection con = DriverManager.getConnection("jdbc:oracle:thin:@mcndesktop07:1521:xe", "sandeep", "welcome");
            PreparedStatement ps = con.prepareStatement("select name from reg where email=? and pass=?");
            ps.setString(1, str1);
            ps.setString(2, str2);
            ResultSet rs = ps.executeQuery();
            if (rs.next())
            {
                f1.setVisible(true);
                f1.setSize(600, 600);
                f1.setLayout(null);
                l = new JLabel();
                l0 = new JLabel("you are succefully logged in..");
                l0.setForeground(Color.blue);
                l0.setFont(new Font("Serif", Font.BOLD, 30));
                l.setBounds(60, 50, 400, 30);
                l0.setBounds(60, 100, 400, 40);
 
                f1.add(l);
                f1.add(l0);
                l.setText("Welcome " + rs.getString(1));
                l.setForeground(Color.red);
                l.setFont(new Font("Serif", Font.BOLD, 30));
 
            } else
            {
                JOptionPane.showMessageDialog(null,
                   "Incorrect email-Id or password..Try Again with correct detail");
            }
        }
        catch (Exception ex)
        {
            System.out.println(ex);
        }
    }
 
    public static void main(String arr[])
    {
        new Login();
    }
}