在java中如何从mongoDB中读取文档并通过websockets发送文档？

import com.mongodb.MongoClient;
import com.mongodb.MongoClientURI;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;
import org.bson.Document;

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

@ServerEndpoint("/websocket")
public class MongoDBWebSocketServer {
    private static final CopyOnWriteArrayList<Session> sessions = new CopyOnWriteArrayList<>();

    @OnOpen
    public void onOpen(Session session) {
        sessions.add(session);
    }

    @OnClose
    public void onClose(Session session) {
        sessions.remove(session);
    }

    @OnMessage
    public void onMessage(String message, Session session) {
        // 处理接收到的消息
    }

    @OnError
    public void onError(Session session, Throwable error) {
        // 处理错误
    }

    public static void main(String[] args) {
        // 连接到MongoDB
        MongoClientURI uri = new MongoClientURI("mongodb://localhost:27017");
        try (MongoClient mongoClient = new MongoClient(uri)) {
            // 选择数据库和集合
            MongoDatabase database = mongoClient.getDatabase("your_database");
            MongoCollection<Document> collection = database.getCollection("your_collection");

            // 读取文档并发送到WebSockets
            try (MongoCursor<Document> cursor = collection.find().iterator()) {
                while (cursor.hasNext()) {
                    Document document = cursor.next();
                    String json = document.toJson();

                    // 发送文档到所有连接的WebSockets客户端
                    for (Session session : sessions) {
                        try {
                            session.getBasicRemote().sendText(json);
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }
                }
            }
        }
    }
}