Java

WebSocket Binance Trade Stream (subscribe and receive updates)

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Subscribe to a binance trade stream and receive updates. Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.JsonObject;
import com.chilkatsoft.chilkat2.Rest;
import com.chilkatsoft.chilkat2.WebSocket;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example requires the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        WebSocket ws = new WebSocket();

        // For brevity, this example does not check for errors when etablishing the WebSocket connection.
        // See Establish WebSocket Connection for more complete sample code for making the connection.

        Rest rest = new Rest();

        // Connect to wss://stream.binance.com:9443
        String responseBody;
        try {
            rest.connect("stream.binance.com", 9443, true, false);

            ws.useConnection(rest);

            ws.addClientHeaders();

            //  Raw streams are accessed at /ws/<streamName>
            responseBody = rest.fullRequestNoBody("GET", "/ws/btcusdt");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        try {
            ws.validateServerHandshake();
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            System.out.println(responseBody);
            System.out.println(rest.getResponseHeader());
            return;
        }

        System.out.println(responseBody);
        System.out.println(rest.getResponseHeader());

        // POST JSON to subscribe to a stream

        // {
        // "method": "SUBSCRIBE",
        // "params":
        // [
        // "btcusdt@aggTrade",
        // "btcusdt@depth"
        // ],
        // "id": 1
        // }

        JsonObject json = new JsonObject();
        json.updateString("method", "SUBSCRIBE");
        json.updateString("params[0]", "btcusdt@aggTrade");
        json.updateString("params[1]", "btcusdt@depth");
        json.updateInt("id", 1);

        // Send a full message in a single frame
        boolean finalFrame = true;
        try {
            ws.sendFrame(json.emit(), finalFrame);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        JsonObject jsonTradeData = new JsonObject();
        jsonTradeData.setEmitCompact(false);

        // Begin reading the trade stream response.
        // We'll just read the 1st 10 updates and then exit..
        int numTradesReceived = 0;
        while (numTradesReceived < 5) {
            try {
                ws.readFrame();
            } catch (ChilkatException e) {
                System.out.println("Failed to receive a frame");
                System.out.println("ReadFrame fail reason = " + ws.getReadFrameFailReason());
                System.out.println(e.getLastErrorText());
                return;
            }

            // The responses we desire are in Text frames, where the opcode = 1.
            if (ws.getFrameOpcodeInt() == 1) {
                String receivedJson = ws.getFrameData();

                jsonTradeData.load(receivedJson);
                System.out.println(jsonTradeData.emit());

                numTradesReceived = numTradesReceived + 1;
            }
        }

        // Close the websocket connection.
        try {
            ws.sendClose(true, 1000, "Closing this websocket.");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Read the Close response.
        try {
            ws.readFrame();
        } catch (ChilkatException e) {
            System.out.println("ReadFrame fail reason = " + ws.getReadFrameFailReason());
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("Success.");

        // The output of the above code is shown here:
    }
}