如何在Java Project中导入Mongo库

Question

我在java构建路径中使用了mongo-java-driver版本3.7.1和3.8.2。不过，我仍然收到错误“无法解析导入com.mongo.MongoClient”。

Connection.class

import java.net.UnknownHostException;
import com.mongodb.MongoClient;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject
import com.mongodb.Mongo;
import com.mongodb.Db;

public class MongoClass {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        try {
            MongoClient mongoClient = new MongoClient("localhost",27017);
            System.out.println("connection successfully established");
        }
        catch(UnknownHostException e) {
            e.printStackTrace();
        }

    }
}

Answer 1

根据MongoDB Java sample，您可以以这种方式开始构建：

import com.mongodb.MongoClientSettings;
import com.mongodb.MongoCredential;
import com.mongodb.ServerAddress;
import com.mongodb.client.MongoClient;
import com.mongodb.client.MongoClients;
import com.mongodb.client.MongoDatabase;

import java.util.Arrays;

public class MongoClass {

private MongoDatabase database = null;

public static void main(String[] args) {
    MongoCredential credential = MongoCredential.createCredential("username", "database", "password".toCharArray());

    MongoClientSettings.Builder builder = MongoClientSettings.builder();

    builder.applicationName("myapp");

    builder.credential(credential);

    builder.applyToClusterSettings((b) ->
            b.hosts(Arrays.asList(new ServerAddress("localhost", 27017))));

    MongoClient mongoClient = MongoClients.create(builder.build());

    database = mongoClient.getDatabase("MYDATABASE_1");

    mongoClient.close();
}