Spring Boot with Mongo DB

In this tutorial, we will be learning how to integrate a spring boot application to Mongo DB cloud using your Mongo DB Atlas account.

Prerequisite

You must have a Mongo DB Atlas account. If not, create one using the below link.

https://www.mongodb.com/cloud/atlas/register

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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.6.7</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.jts</groupId>
	<artifactId>boot-with-mongo</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>boot-with-mongo</name>
	<description>Demo project for Spring Boot</description>
	<properties>
		<java.version>1.8</java.version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-mongodb</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>

application.properties file

spring.data.mongodb.uri=mongodb+srv://<user-name>:<password>@xyzcluster.jwvsbo8.mongodb.net/?retryWrites=true&w=majority
spring.data.mongodb.database=my_db

The above property can be found on your Mongo DB Atlas account as shown below

application.properties file for local mongo db

If you have mongo database running on your local machine, you can use below properties.

#Local MongoDB
spring.data.mongodb.authentication-database=admin
spring.data.mongodb.username=root
spring.data.mongodb.password=pwd
spring.data.mongodb.database=my_db
spring.data.mongodb.port=27017
spring.data.mongodb.host=localhost

Student.java

package com.example.demo;

import java.util.Date;

import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;

@Document
public class Student {

	@Id
	private String id;
	private String name;
	private Date creationDate = new Date();

//getter and setter methods
//constructors
//toString method
}

StudentRepository.java

package com.example.demo;

import org.springframework.data.mongodb.repository.MongoRepository;

public interface StudentRepository extends MongoRepository<Student, String>{

}

StudentController.java

package com.example.demo;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping(value = "/student")
public class StudentController {

	@Autowired
	private StudentRepository studentRepository;
	
	@RequestMapping(value = "/all", method = RequestMethod.GET)
	public List<Student> getAllStudent() {
		System.out.println("Fetching students data");
		return studentRepository.findAll();
	}
	
	@RequestMapping(value = "/create", method = RequestMethod.POST)
	public Student addNewStudent(@RequestBody Student student) {
		return studentRepository.save(student);
	}
}