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:
project-structure.js
Now, let's look at the key Java files for this e-wallet system:
src/main/java/com/ewallet/model/User.java
src/main/java/com/ewallet/model/Wallet.java
src/main/java/com/ewallet/model/Transaction.java
src/main/java/com/ewallet/dao/UserDAO.java
src/main/java/com/ewallet/dao/WalletDAO.java
src/main/java/com/ewallet/dao/TransactionDAO.java
src/main/java/com/ewallet/util/DatabaseUtil.java
src/main/java/com/ewallet/util/AuthenticationUtil.java
src/main/java/com/ewallet/util/SessionUtil.java
src/main/java/com/ewallet/servlet/auth/LoginServlet.java
src/main/java/com/ewallet/servlet/auth/RegisterServlet.java
src/main/java/com/ewallet/servlet/auth/LogoutServlet.java
src/main/java/com/ewallet/servlet/wallet/DepositServlet.java
src/main/java/com/ewallet/servlet/wallet/WithdrawServlet.java
src/main/java/com/ewallet/servlet/wallet/TransferServlet.java
true
src/main/java/com/ewallet/servlet/wallet/BalanceServlet.java
src/main/java/com/ewallet/servlet/wallet/TransactionHistoryServlet.java
Let's look at some of the key JSP files for the user interface:
src/main/webapp/jsp/login.jsp
src/main/webapp/jsp/register.jsp
src/main/webapp/jsp/dashboard.jsp
src/main/webapp/jsp/deposit.jsp
src/main/webapp/jsp/withdraw.jsp
src/main/webapp/jsp/transfer.jsp
src/main/webapp/jsp/transaction-history.jsp
src/main/webapp/css/style.css
src/main/webapp/js/validation.js
src/main/webapp/WEB-INF/web.xml
database-schema.sql
Here's a diagram showing the architecture of our e-wallet system:
Here's a diagram showing the flow of a transfer transaction in our e-wallet system:
This e-wallet system provides a complete solution for users to manage their digital funds. The key features include:
User Authentication and Session Management
Wallet Management
Transaction Tracking
Security Features
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.