如何从.class向@ServerEndpoint发送消息

// 客户端代码
import javax.websocket.*;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;

@ClientEndpoint
public class WebSocketClient {

    private Session session;

    @OnOpen
    public void onOpen(Session session) {
        this.session = session;
    }

    @OnMessage
    public void onMessage(String message) {
        System.out.println("Received message: " + message);
    }

    public void sendMessage(String message) throws IOException {
        session.getBasicRemote().sendText(message);
    }

    public static void main(String[] args) {
        WebSocketContainer container = ContainerProvider.getWebSocketContainer();
        String uri = "ws://localhost:8080/your-server-endpoint";
        try {
            Session session = container.connectToServer(WebSocketClient.class, new URI(uri));
            WebSocketClient client = new WebSocketClient();
            client.onOpen(session);
            client.sendMessage("Hello, server!");
        } catch (DeploymentException | URISyntaxException | IOException e) {
            e.printStackTrace();
        }
    }
}

// 服务器端代码
import javax.websocket.*;
import javax.websocket.server.ServerEndpoint;

@ServerEndpoint("/your-server-endpoint")
public class WebSocketServer {

    @OnOpen
    public void onOpen(Session session) {
        System.out.println("Client connected: " + session.getId());
    }

    @OnMessage
    public void onMessage(String message, Session session) {
        System.out.println("Received message from client " + session.getId() + ": " + message);
    }

    @OnClose
    public void onClose(Session session) {
        System.out.println("Client disconnected: " + session.getId());
    }
}