How to use Java WebSocket to achieve real-time stock quotation display?

With the development of the Internet, real-time updates of stock quotes have become more and more important. The traditional way of displaying stock quotes usually involves constantly refreshing the page to obtain the latest data, which is not very effective and puts a certain amount of pressure on the server. The use of WebSocket technology can effectively realize real-time stock quotation display and effectively reduce the pressure on the server.

WebSocket is a full-duplex communication protocol. Compared with the traditional HTTP protocol, it can enable the server to actively push data to the client without the client sending a request. In this way, the operation of frequently sending requests and responses is avoided, allowing for more efficient real-time display of stock quotes.

The following is a simple example of using Java WebSocket to implement real-time stock quotation display:

1. First, create a WebSocket server class to receive client connection requests and push messages. . This can be achieved using the javax.websocket library provided in Java.

import javax.websocket.*;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;

@ServerEndpoint("/stock")
public class StockWebSocketServer {
    private static final Set<Session> sessions = new CopyOnWriteArraySet<>();

    @OnOpen
    public void onOpen(Session session) {
        sessions.add(session);
        // 在此處可以進行一些初始化操作，比如訂閱股票行情數(shù)據(jù)
    }

    @OnClose
    public void onClose(Session session) {
        sessions.remove(session);
        // 在此處進行資源釋放操作，比如取消訂閱股票行情數(shù)據(jù)
    }

    @OnMessage
    public void onMessage(String message, Session session) {
        // 在此處可以處理客戶端發(fā)送的消息
    }

    @OnError
    public void onError(Throwable throwable) {
        // 在此處處理錯誤信息
    }

    public static void sendMessage(String message) {
        for (Session session : sessions) {
            try {
                session.getBasicRemote().sendText(message);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

2. Then, you can create a simple stock data source, update the stock quotation data at a certain time, and push it to the client through the WebSocket server.

import java.util.Random;

public class StockSource {
    private static final String[] STOCKS = {"AAPL", "GOOGL", "AMZN", "MSFT"};
    private static final Random RANDOM = new Random();
    
    public static void start() {
        new Thread(() -> {
            while (true) {
                String stock = randomStock();
                double price = randomPrice();
                String message = stock + ": " + price;
                StockWebSocketServer.sendMessage(message);
                sleep(1000);
            }
        }).start();
    }
    
    private static String randomStock() {
        int index = RANDOM.nextInt(STOCKS.length);
        return STOCKS[index];
    }
    
    private static double randomPrice() {
        return RANDOM.nextDouble() * 1000;
    }
    
    private static void sleep(int milliseconds) {
        try {
            Thread.sleep(milliseconds);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

3. Finally, start the WebSocket server and stock data source in the main program.

public class Main {
    public static void main(String[] args) {
        StockSource.start();

        WebSocketContainer container = ContainerProvider.getWebSocketContainer();
        try {
            container.connectToServer(StockWebSocketServer.class, new URI("ws://localhost:8080/stock"));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Through the above code example, we can implement a simple real-time stock quotation display system. When the client connects to the WebSocket server, the server will continuously push the latest stock data to the client, achieving real-time update effects. At the same time, it also reduces the pressure on the server and improves system performance and user experience.

Of course, the above are just simple examples. In actual applications, corresponding optimization and processing need to be carried out according to specific needs, such as adding user authentication, data format conversion, etc. At the same time, the front-end page also needs to write corresponding code to receive the data pushed by the WebSocket server and display it.

To summarize, using Java WebSocket technology is a very efficient and feasible choice when implementing real-time stock market display. It enables the server to actively push data to the client, reducing server pressure, improving system performance, and also improving user experience.

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