mongodb更新比较快，spring有点跟不上，直接参考官网，当前版本6.0.8
http://www.mongodb.com/docs/drivers/java/sync/current/fundamentals/connection/connect/#std-label-connect-to-mongodb
添加依赖
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<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>mongodb-driver-sync</artifactId>
    <version>4.10.2</version>
</dependency>
Java代码
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import com.mongodb.*;
import com.mongodb.client.MongoClient;
import com.mongodb.client.MongoClients;
import com.mongodb.client.MongoDatabase;
import org.bson.BsonDocument;
import org.bson.BsonInt64;
import org.bson.Document;
import org.bson.conversions.Bson;
import org.springframework.boot.autoconfigure.SpringBootApplication;
  
@SpringBootApplication
public class MongoApplication {
    public static void main(String[] args) {
        String uri = "mongodb://127.0.0.1:27017";
            try {
                MongoClient client = MongoClients.create(uri);
                //MongoClient client = new MongoClient(URI); //低版本可以这样，但现在是6.0
                MongoDatabase database = mongoClient.getDatabase("admin");
                Bson command = new BsonDocument("ping", new BsonInt64(1));
                Document commandResult = database.runCommand(command);
                System.out.println("连接成功!");
            } catch (MongoException me) {
                System.err.println(me);
            }
 
    }
}
如果遇到找不到这个类那个类找不到的，如：Caused by: java.lang.ClassNotFoundException: com.mongodb.internal.diagnostics.logging.Loggers
是因为mongodb-driver-sync中有几个依赖是<scope>compile</scope><optional>true</optional>
打开他的pom复制到项目中，如果是往现有项目中集成注意不要与现在的log冲突
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<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>1.7.6</version>
</dependency>
<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>bson</artifactId>
    <version>4.10.2</version>
</dependency>
<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>mongodb-driver-core</artifactId>
    <version>4.10.2</version>
</dependency>