Hackforge Academy

Explanation

Step 1: Install Required Tools 🛠️ — Before creating a Spring Boot app, make sure Java (JDK 17+ recommended), Maven (or Gradle), and an IDE like IntelliJ IDEA or VS Code are installed.

Code:

java -version
mvn -version

Explanation

Step 2: Create a Spring Boot Project 🚀 — Use Spring Initializr (https://start.spring.io/) and select Project: Maven, Language: Java, Spring Boot Version: Latest stable, Dependencies: Spring Web. Download and extract the project.

Code:

Group: com.example
Artifact: demo
Dependencies: Spring Web

Explanation

Step 3: Main Application Class ▶️ — This is the entry point of your Spring Boot application. The @SpringBootApplication annotation enables auto-configuration and component scanning.

Code:

package com.example.demo;

import org.springframework.boot.
SpringApplication;
import org.springframework.boot.
autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoApplication {
    public static void main(String[] args) {
 SpringApplication.run(
DemoApplication.class, args);
    }
}

Explanation

Step 4: Create a REST Controller 🌐 — Add a simple controller class to handle HTTP requests and return a response.

Code:

package com.example.demo;

import org.springframework.web.bind.
annotation.GetMapping;

import org.springframework.web.bind.
annotation.RestController;

@RestController
public class HelloController {

    @GetMapping("/hello")
    public String sayHello() {
        return "Hello Spring Boot!";
    }
}

Explanation

Step 5: Run the Application ▶️ — Open terminal in the project folder and run the Spring Boot app using Maven.

Code:

mvn spring-boot:run

Explanation

Step 6: Test the Application ✅ — Open a browser and visit the endpoint below. You should see the response from your controller.

Code:

http://localhost:8080/hello