ChatGPT Clone in Java with OpenAI API, UI, and Voice

This project demonstrates how to build a ChatGPT-like AI assistant using Java 17, OpenAI API, and a clean, modular approach. It provides a simple way to interact with OpenAI's GPT models through a Java application with both a console interface and a graphical user interface (GUI) with text-to-speech capabilities.

Features

• Connect to OpenAI's GPT API using Java 17
• Send single questions or maintain conversation context
• Secure API key management (environment variables or properties file)
• Clean, modular code structure
• Simple console-based example application
• Graphical user interface (GUI) using Java Swing
• Text-to-speech functionality using FreeTTS
• Model selection (GPT-3.5-turbo, GPT-4)
• System message customization

Project Structure

├── src/main/java/com/chatgpt/clone/
│   ├── config/
│   │   └── OpenAIConfig.java       # Configuration for API key and URL
│   ├── model/
│   │   ├── Message.java            # Message model for API requests
│   │   ├── ChatCompletionRequest.java  # Request model
│   │   └── ChatCompletionResponse.java # Response model
│   ├── service/
│   │   └── GPTService.java         # Main service for API communication
│   ├── ui/
│   │   ├── ChatGPTUI.java          # Graphical user interface
│   │   ├── VoiceManager.java       # Text-to-speech functionality
│   │   └── ChatGPTApp.java         # Main application launcher
│   ├── example/
│   │   └── GPTExample.java         # Console example usage
│   ├── util/
│   │   ├── Logger.java             # Logging utility
│   │   └── OpenAIUtil.java         # OpenAI utilities
│   └── exception/
│       └── OpenAIException.java    # Custom exception handling
├── config.properties.example       # Example configuration file
├── run-ui.bat                      # Batch file to run the UI
└── pom.xml                         # Maven dependencies

Prerequisites

• Java 17 or higher
• Maven
• OpenAI API key

Model Screenshot

Setup

1. Clone this repository
2. Configure your OpenAI API key using one of these methods:
   • Environment Variable: Set OPENAI_API_KEY environment variable
     • Windows: set OPENAI_API_KEY=your_api_key_here
     • Linux/macOS: export OPENAI_API_KEY=your_api_key_here
   • Properties File:
     • Copy config.properties.example to config.properties
     • Replace YOUR_API_KEY_HERE with your actual OpenAI API key
3. Build the project: mvn clean install

Usage

Basic Usage

// Create a GPTService instance
GPTService gptService = new GPTService();

// Ask a simple question
String response = gptService.askQuestion("What is the capital of France?");
System.out.println(response);

Conversation with Context

// Create a list to hold the conversation
List<Message> conversation = new ArrayList<>();

// Add a system message to set the context
conversation.add(Message.systemMessage("You are a helpful assistant."));

// Add a user message
conversation.add(Message.userMessage("What is the capital of France?"));

// Get the response
String response = gptService.sendConversation(conversation);

// Add the assistant's response to the conversation
Message assistantMessage = Message.builder()
        .role("assistant")
        .content(response)
        .build();
conversation.add(assistantMessage);

// Continue the conversation
conversation.add(Message.userMessage("What is its population?"));
response = gptService.sendConversation(conversation);
System.out.println(response);

Running the Examples

Console Example

The project includes a console example application that demonstrates both simple questions and interactive conversations:

mvn exec:java -Dexec.mainClass="com.chatgpt.clone.example.GPTExample"

Graphical User Interface

To run the graphical user interface with text-to-speech capabilities:

mvn exec:java -Dexec.mainClass="com.chatgpt.clone.ui.ChatGPTApp"

Or simply run the provided batch file:

run-ui.bat

The UI provides the following features:

• Chat with GPT models (GPT-3.5-turbo or GPT-4)
• Customize system messages
• Enable/disable text-to-speech
• Clear conversation history
• Visual display of conversation

Customization

Using Different Models

You can specify which GPT model to use:

// Use GPT-4 instead of the default GPT-3.5-turbo
String response = gptService.askQuestion("What is quantum computing?", "gpt-4");

Custom API Configuration

You can customize the API URL if needed:

// Create a custom configuration
OpenAIConfig config = new OpenAIConfig("https://your-custom-endpoint.com/v1/chat/completions");
GPTService gptService = new GPTService(config);

License

This project is licensed under the MIT License - see the LICENSE file for details.

Acknowledgments

• OpenAI API Documentation
• OkHttp for HTTP requests
• Jackson for JSON processing

Author

Saurabh Kushwaha
🔗 Portfolio
📧 [email protected]
🔗 LinkedIn
🔗 Instagram Dev Page

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License

This project is licensed under the MIT License.

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