Read and Write Files From MongoDB With Java/Scala

How to read and write files from MongoDB with Java/Scala.

Install the following Maven dependency:

<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>mongodb-driver</artifactId>
    <version>3.3.0</version>
</dependency>

Connect to a MongoDB database with security by running the following lines of code:

// ====== To connect to a MongoDB database with a user and a password.
String connectionUri = "mongodb://user:password@host:27017/";
MongoClientURI mongoUri = new MongoClientURI(connectionUri);
MongoClient mongoClient = new MongoClient(mongoUri);
MongoDatabase db = mongoClient.getDatabase(mongoDatabase);

The MongoDB connection URL format must be mongodb://user:password@host:27017/, where 27017 is the default port.

You can now insert and update a document in MongoDB, as well as query a document from MongoDB by running the following lines of code:

Insert Documents in MongoDB
Update Documents in MongoDB
Query Documents From MongoDB

// ====== To insert a list of BSON documents in MongoDB.
List<Document> places = Arrays.asList(restaurant1,restaurant2);
db.getCollection("restaurants").insertMany(places);

// ====== To update a document.
db.getCollection("restaurants").updateOne(
                    new Document("_id",new ObjectId("57bea96d46e0fb000606c68c")),
                    new Document("$set", new Document("address.street", "East 31st Street")));

// ====== To find documents.
FindIterable<Document> iterable = db.getCollection("restaurants").find();
iterable.forEach(new Block<Document>() {
   @Override
   public void apply(final Document document) {
      logger.info(document.toString());
   }
});

How to delete a collection in MongoDB with Java/Scala?

// ===== To remove a collection.
db.getCollection("restaurants").drop();