To insert a document in a collection, you can use collection.insertOne() or collection.insertMany() methods to insert documents in the collection.

// insert a single document
collection.insertOne(document);

// insert multiple documents
collection.insertMany(documents);

Example

Following is the code snippet to insert documents in a collection −

import java.util.ArrayList;
import java.util.List;

import org.bson.Document;

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

public class Tester {
   public static void main(String[] args) {
      // Creating a Mongo client 
      MongoClient mongoClient = MongoClients.create("mongodb://localhost:27017");
      MongoDatabase database = mongoClient.getDatabase("myDb");

      // Get the collection
      MongoCollection<Document> collection = database.getCollection("sampleCollection");

      Document document = new Document("First_Name", "Mahesh")
         .append("Last_Name", "Parashar")
         .append("Date_Of_Birth", "1990-08-21")
         .append("e_mail", "[email protected]")
         .append("phone", "9034343345");

      collection.insertOne(document);
      List<Document> documents = new ArrayList<>();

      documents.add(new Document("First_Name", "Radhika")
         .append("Last_Name", "Sharma")
         .append("Date_Of_Birth", "1995-09-26")
         .append("e_mail", "[email protected]")
         .append("phone", "9000012345"));

      documents.add(new Document("First_Name", "Rachel")
         .append("Last_Name", "Christopher")
         .append("Date_Of_Birth", "1990-02-16")
         .append("e_mail", "[email protected]")
         .append("phone", "9000054321"));

      documents.add(new Document("First_Name", "Fathima")
         .append("Last_Name", "Sheik")
         .append("Date_Of_Birth", "1990-02-16")
         .append("e_mail", "[email protected]")
         .append("phone", "9000054321"));

      collection.insertMany(documents);

      System.out.println("Documents inserted.");
   }
}

Now, let”s compile and run the above program as shown below.

$javac Tester.java 
$java Tester

Output

On executing, the above program gives you the following output.

Documents inserted.