OkHttp Websockets -连接到websocket时添加正文

import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.WebSocket;
import okhttp3.WebSocketListener;
import okio.ByteString;

public class WebSocketExample {
    public static void main(String[] args) {
        OkHttpClient client = new OkHttpClient();

        Request request = new Request.Builder()
                .url("wss://example.com/websocket")
                .build();

        WebSocketListener listener = new WebSocketListener() {
            @Override
            public void onOpen(WebSocket webSocket, Response response) {
                // 连接成功
                String message = "Hello, server!";
                webSocket.send(message); // 发送文本消息
                //webSocket.send(ByteString.encodeUtf8(message)); // 发送二进制消息
            }

            @Override
            public void onMessage(WebSocket webSocket, String text) {
                // 接收到文本消息
                System.out.println("Received message: " + text);
            }

            @Override
            public void onMessage(WebSocket webSocket, ByteString bytes) {
                // 接收到二进制消息
                System.out.println("Received message: " + bytes.utf8());
            }

            @Override
            public void onClosed(WebSocket webSocket, int code, String reason) {
                // 连接关闭
            }

            @Override
            public void onFailure(WebSocket webSocket, Throwable t, Response response) {
                // 连接失败
            }
        };

        WebSocket webSocket = client.newWebSocket(request, listener);
    }
}