如何使用构造的字符串连接到MongoDB？

import com.mongodb.MongoClient;
import com.mongodb.MongoClientURI;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;

public class MongoDBExample {
    public static void main(String[] args) {
        // 创建MongoDB连接
        MongoClientURI uri = new MongoClientURI("mongodb://localhost:27017");
        MongoClient mongoClient = new MongoClient(uri);

        // 选择数据库
        MongoDatabase database = mongoClient.getDatabase("mydb");

        // 选择集合
        MongoCollection<Document> collection = database.getCollection("mycollection");

        // 构造插入的文档
        Document document = new Document("name", "John")
                .append("age", 30)
                .append("city", "New York");

        // 插入文档
        collection.insertOne(document);

        // 查询文档
        Document query = new Document("name", "John");
        Document result = collection.find(query).first();
        System.out.println(result);

        // 关闭连接
        mongoClient.close();
    }
}