Spring Boot + Spring MVC + MySQL Example Employee Manager App
In this demo we are going to learn how to build a simple crud rest api backend application using Spring Boot and MongoDB.
In order to complete this tutorial, you should have knowledge of beginner or intermediate Java 8 programming skills, some familiarity with Spring Boot, and also you should have a general familiarity with the Windows command prompt.
- Java 11
- Spring Boot 2.6.6
- Maven
- Lombok
- Intelli J
- MongoDB 5.0
- Postman
To start working with MongoDB, first, we have to install it on our local machines. Go to the MongoDB website and download the MongoDB installer from the downloads section.
Once the download is complete double click the file and follow the prompts to install Mongo. Mongo is most likely to be installed in the “C:\Program Files\MongoDB..” directory unless you specify a custom path.
Open a command prompt window and direct it to the bin folder inside the MongoDB folder path.
We will have the following functionalities and Database interactions in our app.
- Get all employees
- Get a employee with ID
- Save a employee
- Update a employee
- Delete a employee
We will make use of the Spring Initializr tool for quickly setting up the project. Don’t forget to add the dependencies Spring WEB & Spring Data MongoDB.
- Spring Data MongoDB
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>- Spring Web
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>- Lombok
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>- dev tools
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>- Spring Validator
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
</dependency>Open src/main/resources/application.properties
- For application.properties:
# MongoDB
spring.data.mongodb.host=[host]
spring.data.mongodb.port=[port]
spring.data.mongodb.username=[username]
spring.data.mongodb.password=[password]
spring.data.mongodb.database=[database_name]
spring.application.name=[Your Application Name]
spring.banner.charset=[UTF-8]
# logging
logging.level.org.springframework.data=debug
logging.level.=error
- For application.yml
spring:
data:
mongodb:
authentication-database: admin
port: 27017
host: localhost
database: EmployeeBackend
application:
name: employee-rest-api
banner:
charset: UTF-8
mvn package
Now let’s test our API calls using postman. Right-click on the project and select Run as a Spring boot App.
mvn spring-boot:run
Testing With Postman
