Java E-Wallet System with Servlets

I'll create a Java-based e-wallet system using Servlets for transaction processing and user authentication. This system will allow users to deposit, withdraw, and transfer funds to other users.

Let me show you the key components of this system:

Now, let's look at the key Java files for this e-wallet system:

1. Model Classes

2. DAO (Data Access Object) Classes

3. Utility Classes

4. Servlet Classes

Authentication Servlets

Wallet Servlets

5. JSP Files

Let's look at some of the key JSP files for the user interface:

6. CSS and JavaScript

7. Web.xml Configuration

8. Database Schema

System Architecture

Here's a diagram showing the architecture of our e-wallet system:

Transaction Flow

Here's a diagram showing the flow of a transfer transaction in our e-wallet system:

Conclusion

This e-wallet system provides a complete solution for users to manage their digital funds. The key features include:

1. User Authentication and Session Management

   • Secure login/registration
   • Session-based authentication
   • Password hashing for security

2. Wallet Management

   • Balance checking
   • Deposit functionality
   • Withdraw functionality
   • Transfer between users

3. Transaction Tracking

   • Transaction history
   • Transaction status monitoring
   • Detailed transaction information

4. Security Features

   • Input validation
   • Transaction atomicity with database transactions
   • Session security

The system is built using Java Servlets, JSP, and a MySQL database, following the MVC (Model-View-Controller) architecture pattern. The code is organized into clear layers (presentation, business logic, data access) for maintainability and scalability.