Implement an instant chat system using Java

With the development and popularization of the Internet, people increasingly need instant chat tools to facilitate communication, especially when they need to communicate and discuss with colleagues or classmates at work or study. This article will introduce how to use Java to implement an instant chat system based on TCP protocol.

1. System Architecture Design

This instant chat system adopts C/S architecture, and the client and server communicate through the TCP protocol. The client is mainly responsible for user interaction and message sending, while the server is responsible for receiving and processing messages, and forwarding the messages to the designated client.

2. Technology selection

This system is developed using Java language and mainly relies on the following technologies:

• Socket network programming: using Java The Socket class library implements TCP protocol communication, including connection establishment, message transmission, etc.
• Multi-threaded programming: Use Java's multi-threading technology to achieve simultaneous connections and message processing of multiple clients.
• JavaFX GUI: Use the JavaFX library to develop the client's graphical interface, including chat windows and login windows.

3. System function implementation

This instant chat system implements the following functions:

• User login: When the client starts, Enter your username and server address to log in. The server will verify whether the user is legitimate based on the user name and broadcast the logged-in user information to other clients.
• Online user list display: The client can view the list of other users currently online and select the target user to send messages to.
• Send a message: Users can enter messages in the chat window and send them to the selected target users.
• Message reception and forwarding: After the server receives a message, it will be forwarded to the target user. After the target user receives the message, it will be displayed in the chat window.

4. Summary

Through this practice, we learned how to use Java to implement an instant chat system based on the TCP protocol. During the project development, we learned about Socket programming, multi-threading technology, JavaFX application development and other knowledge points, and applied them to specific projects. In the process of practice, you also need to pay attention, such as considering thread safety issues and boundary case handling, etc., in order to achieve more complete and stable applications.

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