A Java Servlet + JSP web application for secure user registration and authentication with full input validation and session handling.
📄 Registration Form
- ✅ Username – Only alphabetic characters allowed
- ✅ UserID – Must be unique in the database
- ✅ Email – Validated using Regex
- ✅ Password & Confirm Password – Must match
- ✅ Age – Between 18 and 80
🔐 Login Form
- 🔍 Credentials verified against database records
- ❌ Errors shown for invalid input using session messages
🛠 Backend Features
- 🗃️ DAO Layer for DB interaction
- 🔐 Session management with
HttpSession - 🚫 Input validation and duplicate checking
- 📡 JDBC with MySQL
| Language / Tech | Purpose |
|---|---|
| Java (Servlets & JSP) | Backend logic |
| HTML, CSS, Bootstrap 5 | Frontend UI |
| JDBC | Database connectivity |
| MySQL | Persistent storage |
| Apache Tomcat | Servlet container |
index.jsp → Registration Page
login.jsp → Login Page
register.java → Servlet to handle register/login logic
UserDetails.java → DAO for DB operations
UserData.java → POJO (Entity class)
style.css → Custom CSS styles
⚡ Application Flow
👤 User registers with form input.
🛡️ Fields are validated (server-side).
🗃️ If valid → data saved in MySQL.
🚫 If UserID already exists → error via session message.
🔁 On success → redirected to Login page.
🔓 Login credentials are verified against DB.
✅ If valid → redirected to Home page with:
📸 Screenshots
