Chinthakas16218080 sem2

pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.fitlife</groupId>
+    <artifactId>fitlife-smart-fitness-tracker</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <packaging>war</packaging>
+
+    <name>FitLife Smart Fitness Tracker</name>
+
+    <properties>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <dependencies>
+        <!-- Servlet API for Tomcat 9 (javax namespace) -->
+        <dependency>
+            <groupId>javax.servlet</groupId>
+            <artifactId>javax.servlet-api</artifactId>
+            <version>4.0.1</version>
+            <scope>provided</scope>
+        </dependency>
+
+        <!-- JSP + JSTL -->
+        <dependency>
+            <groupId>javax.servlet.jsp.jstl</groupId>
+            <artifactId>jstl-api</artifactId>
+            <version>1.2</version>
+        </dependency>
+        <dependency>
+            <groupId>taglibs</groupId>
+            <artifactId>standard</artifactId>
+            <version>1.1.2</version>
+        </dependency>
+
+        <!-- MySQL Connector (you can change to MariaDB or others) -->
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+            <version>8.0.33</version>
+        </dependency>
+
+        <!-- WEKA (stable) -->
+        <dependency>
+            <groupId>nz.ac.waikato.cms.weka</groupId>
+            <artifactId>weka-stable</artifactId>
+            <version>3.8.0</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>fitlife-smart-fitness-tracker</finalName>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.11.0</version>
+                <configuration>
+                    <source>17</source>
+                    <target>17</target>
+                </configuration>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-war-plugin</artifactId>
+                <version>3.4.0</version>
+                <configuration>
+                    <failOnMissingWebXml>false</failOnMissingWebXml>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>

src/main/java/com/fitlife/config/DBConnection.java

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+package com.fitlife.config;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+
+public class DBConnection {
+
+    private static final String URL = "jdbc:mysql://localhost:3306/fitlife_db";
+    private static final String USER = "root";
+    private static final String PASSWORD = "password";
+
+    static {
+        try {
+            Class.forName("com.mysql.cj.jdbc.Driver");
+        } catch (ClassNotFoundException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public static Connection getConnection() throws SQLException {
+        return DriverManager.getConnection(URL, USER, PASSWORD);
+    }
+}

src/main/java/com/fitlife/dao/UserDAO.java

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+package com.fitlife.dao;
+
+import com.fitlife.config.DBConnection;
+import com.fitlife.model.User;
+
+import java.sql.*;
+import java.time.LocalDateTime;
+
+public class UserDAO {
+
+    public User findByUsername(String username) throws SQLException {
+        // IMPORTANT: use password_hash (NOT password)
+        String sql = "SELECT id, username, password_hash, email, created_at FROM users WHERE username = ?";
+
+        try (Connection conn = DBConnection.getConnection();
+             PreparedStatement ps = conn.prepareStatement(sql)) {
+
+            ps.setString(1, username);
+            try (ResultSet rs = ps.executeQuery()) {
+                if (rs.next()) {
+                    return mapRow(rs);
+                }
+            }
+        }
+        return null;
+    }
+
+    public boolean usernameExists(String username) throws SQLException {
+        return findByUsername(username) != null;
+    }
+
+    public User createUser(String username, String rawPassword, String email) throws SQLException {
+        // IMPORTANT: insert into password_hash (NOT password)
+        String sql = "INSERT INTO users (username, password_hash, email) VALUES (?, ?, ?)";
+
+        try (Connection conn = DBConnection.getConnection();
+             PreparedStatement ps = conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS)) {
+
+            ps.setString(1, username);
+            ps.setString(2, rawPassword);   // for coursework, plain text is fine
+            ps.setString(3, email);
+            ps.executeUpdate();
+
+            try (ResultSet keys = ps.getGeneratedKeys()) {
+                if (keys.next()) {
+                    int id = keys.getInt(1);
+                    User u = new User();
+                    u.setId(id);
+                    u.setUsername(username);
+                    u.setPasswordHash(rawPassword);
+                    u.setEmail(email);
+                    u.setCreatedAt(LocalDateTime.now());
+                    return u;
+                }
+            }
+        }
+        return null;
+    }
+
+    public User validateLogin(String username, String rawPassword) throws SQLException {
+        User u = findByUsername(username);
+        if (u == null) return null;
+
+        if (u.getPasswordHash() != null && u.getPasswordHash().equals(rawPassword)) {
+            return u;
+        }
+        return null;
+    }
+
+    private User mapRow(ResultSet rs) throws SQLException {
+        User u = new User();
+        u.setId(rs.getInt("id"));
+        u.setUsername(rs.getString("username"));
+        // IMPORTANT: map password_hash column → passwordHash field
+        u.setPasswordHash(rs.getString("password_hash"));
+        u.setEmail(rs.getString("email"));
+
+        Timestamp ts = rs.getTimestamp("created_at");
+        if (ts != null) {
+            u.setCreatedAt(ts.toLocalDateTime());
+        }
+        return u;
+    }
+}