Java MongoDB Example

Java MongoDB Example for beginners and professionals with examples on CRUD, insert document, query document, update document, delete document, use database, projection etc.

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Java MongoDB Connectivity

To connect with MongoDB database, Java project includes the following steps. Here, we are creating a maven project and providing dependency for the mongodb-driver.

Follow the Steps:

1) Create a Maven Project

2) Add Dependecy to POM file

// pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.TheDeveloperBlog</groupId>
<artifactId>java-mongo-db</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<name>java-mongodb</name>
<dependencies>
<dependency>
<groupId>org.mongodb</groupId>
<artifactId>mongodb-driver</artifactId>
<version>3.4.2</version>
</dependency>
</dependencies>
</project>

3) Create Java File

Create a Java file and write code to create connection.

// JavaMongoDemo.java

package com.TheDeveloperBlog.java.mongo.db;
import com.mongodb.MongoClient;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import org.bson.Document;
public class JavaMongoDemo {
public static void main(String[] args){
try{
//---------- Connecting DataBase -------------------------//
MongoClient mongoClient = new MongoClient( "localhost" , 27017 );
//---------- Creating DataBase ---------------------------//
MongoDatabase db = mongoClient.getDatabase("TheDeveloperBlog");
//---------- Creating Collection -------------------------//
MongoCollection<Document> table = db.getCollection("employee");
//---------- Creating Document ---------------------------//  
Document doc = new Document("name", "Peter John");
doc.append("id",12);
//----------- Inserting Data ------------------------------//
table.insertOne(doc);
}catch(Exception e){
System.out.println(e);
}
}
}

4) Build Dependency to load JAR

Project Structure

Finally, our project structure look like this.

5) Enter into Mongo Shell

Make sure, we have mongoDB installed. After installing, enter into mongo shell by typing the following command.

$ mongo

Databases

We can see available databases by using the following command.

> show dbs

We can see that there is no database available. let's create a database.

Run Java File

Run this file to create database.

Database

Check MongoDB again to see the available databases.

See, a database TheDeveloperBlog is created.

Collection

See, the created collection employee.

Record

See the inserted record.

Well, we can see that the Java program is executing fine and we can also perform other databases operations as well.

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