Following are the steps
1) Create a java project in one of the IDEs. I have used Eclipse.
2) Then add following libraries to the classpath
mongodb-driver-3.2.2.jar
mongodb-driver-3.2.2-javadoc.jar
bson-3.0.2.jar
mongodb-driver-async-3.2.2.jar
mongodb-driver-core-3.2.2.jar
mongo-java-driver-3.2.2.jar
All these libraries can be downloaded from the link here. If you like you can very well use maven instead of downloading.
3) Write a simple client code
import org.bson.Document;
import com.mongodb.MongoClient;
import com.mongodb.client.FindIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;
public class MongoDBClient {
public static void main(String[] args) throws Exception{
MongoClient client = new MongoClient("localhost", 27017);
MongoDatabase testDB = client.getDatabase("test");
System.out.println("Dropping person collection in test database");
MongoCollection<Document> collection = testDB.getCollection("person");
collection.drop();
System.out.println("Adding a person document in the person collection of test database");
Document person = new Document("name", "Ashok Kumar Chava").append("age", 35).append("job", "none");
collection.insertOne(person);
person = new Document("name", "Advik Chava").append("age", 7).append("education", "PG");
collection.insertOne(person);
System.out.println("Now finding a persons using find");
FindIterable<Document> persons = collection.find();
MongoCursor<Document> personList=persons.iterator();
while(personList.hasNext()){
person=personList.next();
System.out.printf("Person found, name is %s and age is %s education is %s job is %s\n", person.get("name"),
person.get("age"), person.get("education"), person.get("job"));
}
System.out.println("Closing client");
client.close();
}
}
4) Following will be the output of the above code
Adding a person document in the person collection of test database
Now finding a persons using find
Person found, name is Ashok Kumar Chava and age is 35 education is null job is none
Person found, name is Advik Chava and age is 7 education is PG job is null
Closing client
5) As you can see in the above code I have created a person Document and added few key values details to the Document. Also if you observe for the first person I completly ignored the eduction key value and for the second one I completely ignored the job key value. Then I am able to retrieve the values.
In the next section I will do some thing little more complicated.
