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‎AppBackend.java‎

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import java.sql.PreparedStatement;
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import java.sql.Connection;
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import java.sql.DriverManager;
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import java.sql.Statement;
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import java.sql.SQLException;
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import java.io.File;
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import java.time.LocalDate;
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import java.time.LocalDateTime;
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import java.time.format.DateTimeFormatter;
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import java.util.UUID;
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public class AppBackend {
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protected void setupDatabase() {
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String appDataPath = System.getenv("APPDATA") + "\\SessionTracker";
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String dbPath = appDataPath + "\\user_sessions.db"; // Path to SQLite database
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String dbUrl = "jdbc:sqlite:" + dbPath;
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try {
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// Create the directory for the database if it doesn't exist
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File dbDir = new File(appDataPath);
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boolean dirsCreated = dbDir.mkdirs(); // Returns true if the directories were created
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if (dirsCreated) {
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System.out.println("Directories were successfully created.");
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} else {
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System.out.println("Directories already exist or could not be created.");
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}
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// Connect to the database
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try (Connection conn = DriverManager.getConnection(dbUrl)) {
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if (conn != null) {
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try (Statement stmt = conn.createStatement()) {
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// Creates the sessions table if it doesn't already exist
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String createTableSQL = """
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CREATE TABLE IF NOT EXISTS sessions (
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name TEXT NOT NULL,
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usn TEXT NOT NULL,
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login_time TEXT NOT NULL,
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logout_time TEXT,
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sem TEXT,
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dept TEXT,
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batch TEXT,
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session_id TEXT primary key
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);
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""";
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stmt.execute(createTableSQL);
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}
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}
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}
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} catch (SQLException e) {
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System.out.println("SQLException: " + e.getMessage());
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System.out.println("SQLState: " + e.getSQLState());
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System.out.println("VendorError: " + e.getErrorCode());
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}
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}
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protected void insertData(String name,String usn) {
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String loginTime = LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
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String dbUrl = "jdbc:sqlite:"+System.getenv("APPDATA")+"\\SessionTracker"+"\\user_sessions.db";
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String sessionId = UUID.randomUUID().toString();
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String insertSQL = """
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INSERT INTO sessions (name, usn, login_time, sem, dept, batch, session_id)
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VALUES (?, ?, ?, ?, ?, ?, ?);
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""";
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try (Connection conn = DriverManager.getConnection(dbUrl);
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PreparedStatement pstmt = conn.prepareStatement(insertSQL)) {
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pstmt.setString(1, name);
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pstmt.setString(2, usn);
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pstmt.setString(3, loginTime);
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int year = LocalDate.now().getYear()%2000 - Integer.parseInt(usn.substring(3, 5)) + 1;
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int sem = LocalDate.now().getMonthValue() < 6 ? year*2-2/*even sem*/ : year*2 -1/*odd*/ ;
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int usnNumber = Integer.parseInt(usn.substring(7));
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String batch = (usnNumber < 30 || (usnNumber>60 && usnNumber<90)) ? "I" : "II" ;
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System.out.println(batch);
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pstmt.setInt(4, sem);
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if (usn.contains("IS")) pstmt.setString(5, "ISE");
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else if(usn.contains("CS")) pstmt.setString(5, "CSE");
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else if(usn.contains("AI")) pstmt.setString(5, "AIML");
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else if(usn.contains("CD")) pstmt.setString(5, "DS");
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else if(usn.contains("EC")) pstmt.setString(5, "ECE");
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else if(usn.contains("ME")) pstmt.setString(5, "MECH");
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else if (usn.contains("CV")) pstmt.setString(5, "CIVIL");
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else pstmt.setString(5, "Invalid");
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pstmt.setString(6, batch);
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pstmt.setString(7, sessionId);
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pstmt.executeUpdate();
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} catch (SQLException e) {
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System.out.println("SQLException: " + e.getMessage());
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System.out.println("SQLState: " + e.getSQLState());
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System.out.println("VendorError: " + e.getErrorCode());
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}
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}
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}

‎CloudDatabaseUpload.java‎

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import java.sql.*;
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public class CloudDatabaseUpload {
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protected static void insertDataRemote(String name, String usn, String login_time, String logout_time, String sem, String dept, String batch, String sub, String sessionId) {
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String JDBC_URL = "your_DB_URL_goes_in_here";
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try (Connection con = DriverManager.getConnection(JDBC_URL)) {
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String insertData = " INSERT INTO sessions (name, usn, login_time, logout_time, sem, dept, sub, batch, session_id) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?); ";
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try(PreparedStatement ps = con.prepareStatement(insertData)) {
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ps.setString(1, name);
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ps.setString(2, usn);
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ps.setString(3, login_time);
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ps.setString(4, logout_time);
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ps.setString(5, sem);
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ps.setString(6, dept);
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ps.setString(7, sub);
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ps.setString(8, batch);
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ps.setString(9, sessionId);
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ps.execute();
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}
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} catch (SQLException e) {
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System.out.println("SQLException: " + e.getMessage());
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System.out.println("SQLState: " + e.getSQLState());
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System.out.println("VendorError: " + e.getErrorCode());
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}
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}
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protected static void syncLocalDataToRemote() {
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String appDataPath = System.getenv("APPDATA") + "\\SessionTracker";
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String dbPath = appDataPath + "\\user_sessions.db"; // Path to SQLite database
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String localDbUrl = "jdbc:sqlite:"+ dbPath; // Your local database;
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String selectSql = "SELECT * FROM sessions";
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try (Connection localConn = DriverManager.getConnection(localDbUrl);
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PreparedStatement ps = localConn.prepareStatement(selectSql);
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ResultSet rs = ps.executeQuery()) {
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while (rs.next()) {
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insertDataRemote(rs.getString(1),rs.getString(2),rs.getString(3),rs.getString(4),rs.getString(5),rs.getString(6),rs.getString(7),rs.getString(8),rs.getString(9));
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}
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} catch (SQLException e) {
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System.out.println("SQLException: " + e.getMessage());
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System.out.println("SQLState: " + e.getSQLState());
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System.out.println("VendorError: " + e.getErrorCode());
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}
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}
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}

‎Main.java‎

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import javax.swing.SwingUtilities;
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public class Main{
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public static void main(String [] args){
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new AppBackend().setupDatabase();
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CloudDatabaseUpload.syncLocalDataToRemote();
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SwingUtilities.invokeLater(MyFrame::new);
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}
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}

‎MyFrame.java‎

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import javax.swing.*;
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import java.awt.*;
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import java.awt.event.ActionEvent;
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import java.awt.event.ActionListener;
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class MyFrame extends JFrame implements ActionListener {
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MyPanel p1,p2;
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MyFrame() {
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p1 = new MyPanel("Log-In");
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p1.jb1.addActionListener(this);
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p1.jb2.addActionListener(this);
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this.getContentPane().setLayout(new GridBagLayout());
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this.getContentPane().add(p1);
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this.setResizable(false);
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this.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
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this.setUndecorated(true);
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this.setAlwaysOnTop(true);
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this.setExtendedState(JFrame.MAXIMIZED_BOTH);
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this.setLocationRelativeTo(null);
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this.setVisible(true);
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}
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@Override
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public void actionPerformed(ActionEvent ae){
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String cmd = ae.getActionCommand();
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if("login_submit".equals(cmd)) {
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String Username = p1.tf1.getText().trim();
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String USN = p1.tf2.getText();
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if(ValueCheck(USN,Username)) {
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//AppBackend ab1 = new AppBackend();
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new AppBackend().insertData(Username,USN);
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CloudDatabaseUpload.syncLocalDataToRemote();
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System.exit(0);
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}
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else
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JOptionPane.showMessageDialog(this,"Invalid input");
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}
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else if("admin_panel".equals(cmd)) {
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this.getContentPane().remove(p1);
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p2 = new MyPanel();
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p2.jb3.addActionListener(this);
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p2.jb4.addActionListener(this);
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this.getContentPane().add(p2);
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this.revalidate();
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this.repaint();
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}
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else if("admin_submit".equals(cmd)) {
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String password = new String(p2.tf3.getPassword());
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if (password.equals("admin"))
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System.exit(0);
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else
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JOptionPane.showMessageDialog(this, "Wrong password");
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}
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else if("back".equals(cmd)) {
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this.getContentPane().remove(p2);
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this.getContentPane().add(p1);
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this.revalidate();
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this.repaint();
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}
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}
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protected boolean ValueCheck(String usn,String name) {
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if(usn.isEmpty() || name.isEmpty() || usn.length() != 10)
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return false;
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String pattern = "^1VI\\d{2}[A-Z]{2}\\d{3}$";
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return usn.toUpperCase().matches(pattern);
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}
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}

‎MyPanel.java‎

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import javax.swing.*;
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import java.awt.*;
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class MyPanel extends JPanel {
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JLabel l1,l2,l3,l4,l5;
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JButton jb1,jb2,jb3,jb4;
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JTextField tf1,tf2;
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JPasswordField tf3;
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MyPanel() {
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this.setLayout(null);
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this.setPreferredSize(new Dimension(420,420));
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l4 = new JLabel("ADMIN LOGIN");
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l4.setBounds(135,20,150,50);
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l4.setFont(l4.getFont().deriveFont(Font.BOLD));
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l4.setFont(l4.getFont().deriveFont(20f));
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l3 = new JLabel("Password");
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l3.setBounds(130,95,150,30);
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tf3 = new JPasswordField(15);
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tf3.setBounds(130,120,150,30);
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jb3 = new JButton("Submit");
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jb3.setBounds(130,170,150,30);
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jb3.setActionCommand("admin_submit");
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jb4 = new JButton("Back to Log in ?");
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jb4.setBounds(130,300,150,25);
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jb4.setBorderPainted(false);
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jb4.setContentAreaFilled(false);
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jb4.setForeground(Color.blue);
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jb4.setActionCommand("back");
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this.add(l3);
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this.add(l4);
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this.add(jb3);
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this.add(tf3);
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this.add(jb4);
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}
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MyPanel(String pname) {
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this.setName(pname);
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this.setLayout(null);
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this.setPreferredSize(new Dimension(420,420));
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tf1 = new JTextField();
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tf1.setBounds(130,120,150,25);
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tf2 = new JTextField();
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tf2.setBounds(130,170,150,25);
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l1 = new JLabel("Name");
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l1.setBounds(130,95,150,30);
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l2 = new JLabel("USN");
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l2.setBounds(130,145,150,30);
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l5 = new JLabel("LOGIN");
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l5.setBounds(155,20,150,50);
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l5.setFont(l5.getFont().deriveFont(Font.BOLD));
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l5.setFont(l5.getFont().deriveFont(30f));
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jb1 = new JButton("Submit");
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jb1.setBounds(130,220,150,25);
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jb1.setActionCommand("login_submit");
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jb2 = new JButton("Log In as Admin ?");
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jb2.setBounds(130,300,150,25);
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jb2.setBorderPainted(false);
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jb2.setContentAreaFilled(false);
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jb2.setForeground(Color.blue);
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jb2.setActionCommand("admin_panel");
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this.add(jb1);
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this.add(jb2);
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this.add(tf1);
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this.add(tf2);
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this.add(l1);
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this.add(l2);
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this.add(l5);
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}
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}

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