Captcha-service-project

A secure and reusable CAPTCHA service built with Java Servlets to generate and validate CAPTCHA images for any web application.

Developed By

Rahul Gupta
BCA Student, Amity University Online

Technologies Used

• Java 8
• Servlet API
• Apache Tomcat Server v9.0
• Eclipse IDE
• HTML5, CSS3, JS

Features

• Dynamic CAPTCHA image generation**
• One randomly rotated character** for enhanced security
• No exposure of original CAPTCHA text to frontend**
• Backend-only validation logic**
• Integrated with a secure user data collection form**

How to Run

Requirements:

• Java 8 or above
• Apache Tomcat v9.0.x (Do not use Tomcat 10 or above)

There are two ways to run this project:

Option 1: Using WAR File (Recommended)

This is the easiest way to deploy and test the CAPTCHA service.

Steps:

• Go to the Releases section of the repository.
• Download the CaptchaService.war file.
• Copy the WAR file to the webapps directory of Apache Tomcat v9.0. Make sure you're using Tomcat v9.0.x. Higher versions (like v10+) may cause compatibility issues due to the javax.servlet package changes.
• Start the Tomcat server.
• Open your browser and navigate to: http://localhost:8080/CaptchaService

Option 2: Run from Eclipse (For Development & Testing)

If you prefer to run and test the project directly from your IDE:

Prerequisites:

• Java 8 or above
• Apache Tomcat v9.0 configured in Eclipse
• Eclipse IDE for Enterprise Java Developers

Steps:

Import the Project:

• Open Eclipse.
• Go to File → Import → Existing Maven Projects.
• Browse to your project folder (captcha-service-project) and click Finish. Set the Target Runtime:
• Right-click the project → Properties → Targeted Runtimes.
• Select Apache Tomcat v9.0. Add Tomcat Server:
• In Servers tab → New → Server → Apache → Tomcat v9.0.
• Choose the same Tomcat installation directory. Run the Project:
• Right-click on the project → Run As → Run on Server. Access the Web App:
• Once deployed, open your browser and visit: http://localhost:8080/CaptchaService

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Use Case

This CAPTCHA service can be integrated with any basic web form to prevent spam or bot submissions. Where it can be used:

• Contact forms to avoid spam messages
• Registration forms so only real people can sign up
• Login pages for extra protection (if needed)
• Feedback or suggestion forms to make sure real users are submitting
• Any basic form where you want to check if a human is using it