Spring Boot Integration With MongoDB as a Maven Project

MongoDB is a popular NoSQL database that stores data in JSON-like documents instead of traditional tables and rows. It is flexible and widely used in modern applications because it does not require a fixed schema. Spring Boot provides easy integration with MongoDB using Spring Data MongoDB, which simplifies database access and reduces boilerplate code.

• Supports dynamic schema, allowing easy modification of data structure without affecting existing data.
• Spring Boot enables quick setup and seamless integration with MongoDB using auto-configuration and starter dependencies.

Prerequisites

• Java 8 or higher
• MongoDB
• Any IDE such as IntelliJ IDEA, Eclipse IDE

Steps To Implements MongoDB with Spring Boot

Step 1: Create a Spring Boot Project

Create a new project using Spring Initializr.

Project Configuration

• Project: Maven
• Language: Java
• Spring Boot Version: Latest stable version
• Group: com.gfg
• Artifact: springBoot-MongoDB-SampleProject
• Packaging: Jar
• Java Version: 17 or higher

Add Dependencies:

Select the following dependencies:

• Spring Web
• Spring Data MongoDB

Download the project, extract it, and open it in your IDE.

Step 2: Project Structure

After creating the project, the folder structure will look like this:

As it is a maven project, let's start with adding dependencies via 

pom.xml

File to mention the connectivity with MongoDB database

Step 3: Add MongoDB Configuration

Open application.properties and configure the MongoDB connection.application.properties

spring.data.mongodb.host=localhost
spring.data.mongodb.port=27017
spring.data.mongodb.database=geeksforgeeks

This configuration connects the Spring Boot application to the MongoDB database.

Step 4: Create the MongoDB Document Class

Create a class Book.java inside the docs package.

Book.java

Step 5: Create the MongoDB Document Class

Create a class Book.java inside the docs package.

BookRepository.java

Step 6: Create Service Layer

Create BookService.java inside the service package.

BookService.java

Step 7: Create Controller Class

Create BookController.java inside the controller package.

BookController.java

Main file that contains the main method and can be used to run as a Java application 

Step 8: Build the Maven Project

Run the following command:

mvn clean install # As this is maven project

This will compile the project and download dependencies.

Step 9: Run the Application

Run the Spring Boot application using:

mvn spring-boot:run

Output:

Step 10: Test the APIs

We can test the same in the below ways. First, let us add the book

URL: http://localhost:8080/addBook?bookId=1&isbnNumber=12345&bookName=JavaBasics&category=Programming

Now list out the books

URL: http://localhost:8080/getAllBooks

Let's add 2 more books

We can search books by means of category 

URL: http://localhost:8080/getBook?category=Programming

Similarly, we can do it by bookId as well

Like this, we can do all business logic as per our needs. It is quite easier to integrate MongoDB with SpringBoot technologies.