How to implement an online business card exchange system using WebSocket and JavaScript

How to use WebSocket and JavaScript to implement an online business card exchange system

Introduction:
With the development of the Internet, people pay more and more attention to online socialization and network communication. In the past, people often exchanged contact information through paper business cards, but with the advancement of technology, "online business card exchange system" has gradually become a new trend. This article will introduce how to use WebSocket and JavaScript to implement a simple online business card exchange system, and provide corresponding code examples.

1. Understand WebSocket technology
WebSocket is a network protocol that establishes real-time, two-way communication between the client and the server. Compared with the traditional HTTP protocol, WebSocket has lower latency and higher real-time performance, and can achieve two-way communication without the client first initiating a request.

2. Implementation ideas and steps

1. Create a WebSocket connection: In JavaScript, we can use the WebSocket object to create a WebSocket connection. The code is as follows:

   var socket = new WebSocket("ws://localhost:8080");    // 替换为实际服务器地址和端口号

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2. Listening to WebSocket events: WebSocket provides some events for us to monitor, such as connection establishment, message reception, connection closing, etc. You can monitor corresponding events and perform related operations according to specific needs. The code is as follows:

   socket.onopen = function() {
   // 连接建立成功
   };
   
   socket.onmessage = function(event) {
   // 接收到新消息
   var message = event.data;
   // 处理消息
   };
   
   socket.onclose = function() {
   // 连接关闭
   };

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3. Sending and receiving messages: You can send messages to the server through the send method of the WebSocket object. After receiving the message, the server can perform relevant processing and Return the results to the client. The code is as follows:

   // 客户端发送消息
   var message = 'Hello, World!';
   socket.send(message);
   
   // 客户端接收消息
   socket.onmessage = function(event) {
   var message = event.data;
   // 处理服务端返回的消息
   };

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4. Business card exchange system logic: In practical applications, we can implement an online business card exchange system through WebSocket. Specifically, WebSocket can be used to implement user registration, login, business card exchange and other functions:
   (1) User registration: Users can register through username and password, and the server will verify and store user information after receiving the registration request.
   (2) User login: After successful registration, the user can use the user name and password during registration for login verification. After the server verifies the user information, a WebSocket connection is established.
   (3) Business card exchange: Users can send business card information to other users through WebSocket, and other users will process the business card information accordingly after receiving the business card information.

3. Simple Example
The following is a code example of a simple online business card exchange system, which includes registration, login and business card exchange functions:

// 注册用户
socket.send(JSON.stringify({
   "action": "register",
   "username": "John",
   "password": "password123"
}));

// 登录用户
socket.send(JSON.stringify({
   "action": "login",
   "username": "John",
   "password": "password123"
}));

// 交换名片
socket.send(JSON.stringify({
   "action": "exchange",
   "username": "John",
   "card": {
      "name": "John Smith",
      "email": "john@example.com",
      "phone": "1234567890"
   }
}));

The above example is just A simple demonstration. In actual applications, business logic needs to be developed according to specific needs.

Conclusion:
This article introduces the basic ideas and steps of how to use WebSocket and JavaScript to implement an online business card exchange system, and provides corresponding code examples. Through learning and practice, readers can further understand the use of WebSocket and apply it to their own projects. I hope this article can be helpful to readers, thank you for reading!

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