Java Client-Server Chat Application

Project Overview

This project is a Java-based client-server chat application designed for real-time communication between multiple clients. The system follows a client-server architecture where clients connect to a central server to exchange messages. One user is assigned as an admin with additional privileges such as managing users and handling special requests. The system includes a Graphical User Interface (GUI) for both the client and the server, making it more user-friendly.

Key Features

• Real-Time Communication: Multiple clients can connect and communicate in real-time.
• Admin Privileges: The admin has special privileges such as managing the user list and handling client requests.
• Private Messaging: Clients can send private messages to each other using the /private command.
• Dynamic Admin Assignment: If the admin disconnects, the system automatically assigns a new admin from the remaining users.
• Secure User Management: Only registered users can post messages, and user authentication (sign-in and sign-up) is enforced.
• Graphical User Interface: Both server and clients have user-friendly GUIs for interaction.
• SQL Injection Prevention: Security measures are implemented to guard against SQL injections.

Technologies Used

• Java: Core programming language.
• Swing: GUI framework used to create client and server interfaces.
• Socket Programming: Facilitates the connection between clients and server.
• Multithreading: Ensures that the server can handle multiple client connections simultaneously.
• Maven: Optional for project management and dependency resolution.

Project Structure

• Client: Handles the client-side connection to the server and user interface interaction.
• ClientHandler: Manages the communication and interaction between the server and individual clients.
• Server: Handles client connections, message broadcasting, and admin assignments.
• CommunicationServerGUI: Provides a client-side graphical user interface for message handling.
• ServerGUI: Provides a server-side graphical user interface for monitoring server activity and connections.
• Log_into_server: Provides a GUI for clients to log into the server.
• Welcome_page: Provides a GUI for creating a server.

How to Run

Prerequisites

• Java Development Kit (JDK): Ensure JDK 8 or higher is installed on your system.
• Maven (Optional): For managing dependencies and building the project.

Running the Server

• Run the Welcome_Page file
• To start the server click on "Create Server" button
• The server will start and wait for incoming client connections on the default port (1234). Modify the port in the code if necessary.
• To join server click "Join Server" button , Enter the server's IP address and port number to connect. Optionally, you can enter a unique client ID.

Messaging

After connecting to the server, you can start exchanging messages with other connected users. Admins have additional privileges, such as managing users and responding to special requests.

Key Functionalities

• Message Broadcasting: All users can broadcast public messages.
• Private Messaging: Use the /private <username> <message> command to send direct messages to other users.
• Admin Control: Admins can view the user list, respond to requests, and manage connected users.
• Automatic Admin Assignment: If the current admin disconnects, the system automatically selects a new admin.
• User List: Admins can view all connected users with their usernames and IDs.

Future Enhancements

• Database Integration: Add persistent storage to save chat history in a database (e.g., MySQL).
• Encryption: Implement SSL/TLS for secure communication between clients and the server.
• Additional Features: Add file sharing, enhanced user management, and more detailed logging.

Troubleshooting

• Port Conflicts: Ensure that port 1234 (or the one configured) is available on your system.
• Firewall Issues: If the server is hosted remotely, ensure that the required ports are open in your firewall.