Project Overview: Todo Management Web Application

Core Functionality

1. User Authentication

   • Registration with password hashing
   • Login/logout with session management
   • Password security using PBKDF2 hashing

2. Todo Operations

   • Create todo items with due dates
   • (Implied) CRUD operations for task management
   • User-specific todo items (each user sees their own tasks)

3. API Endpoints

   • POST /api/auth/register - User registration
   • POST /api/auth/login - User login
   • GET /api/auth/logout - Session termination
   • POST /api/todos - Create new todo items

Technical Stack

• Backend: Java Servlets
• Data Handling:
  • GSON for JSON serialization
  • Custom TypeAdapter for LocalDate
• Database:
  • MySQL (JDBC)
  • DAO pattern for data access
• Security:
  • Password hashing
  • Session-based authentication

Key Components

1. Authentication Controller (AuthController)

   • Handles user sessions
   • Prevents multiple logins
   • Validates credentials

2. Todo Controller

   • Manages todo operations
   • Enforces user ownership
   • Handles date serialization

3. Utility Classes

   • PasswordUtil: Secure password handling
   • TimeUtils: Date conversions

Data Flow

1. Frontend → JSON API → Servlet → DAO → Database
2. All responses in JSON format

Notable Features

• REST-like API design
• Proper separation of concerns (controllers, DAOs, utils)
• Secure practices for authentication
• Type-safe date handling with Java 8 Time API