如何在java应用程序中连接到mongo db？

<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>mongo-java-driver</artifactId>
    <version>3.12.10</version>
</dependency>

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

public class MongoDBConnection {
    public static void main(String[] args) {
        // MongoDB服务器的连接URI
        String uri = "mongodb://localhost:27017";
        
        // 创建MongoClient实例
        MongoClientURI clientURI = new MongoClientURI(uri);
        MongoClient mongoClient = new MongoClient(clientURI);
        
        // 获取数据库实例
        MongoDatabase database = mongoClient.getDatabase("mydb");
        
        // 连接成功，可以进行数据库操作
        System.out.println("Connected to MongoDB");
        
        // 关闭连接
        mongoClient.close();
    }
}

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

public class MongoDBOperations {
    public static void main(String[] args) {
        // 获取数据库实例
        MongoDatabase database = mongoClient.getDatabase("mydb");
        
        // 获取集合实例
        MongoCollection<Document> collection = database.getCollection("mycollection");
        
        // 插入文档
        Document document = new Document("name", "John")
                .append("age", 30)
                .append("city", "New York");
        collection.insertOne(document);
        
        // 查询文档
        Document query = new Document("name", "John");
        MongoCursor<Document> cursor = collection.find(query).iterator();
        while (cursor.hasNext()) {
            Document result = cursor.next();
            System.out.println(result.toJson());
        }
        
        // 更新文档
        Document filter = new Document("name", "John");
        Document update = new Document("$set", new Document("age", 31));
        collection.updateOne(filter, update);
        
        // 删除文档
        collection.deleteOne(filter);
        
        // 关闭连接
        mongoClient.close();
    }
}