Play Store Application link – Spring Boot in 13 steps – App on Google Play

Spring Boot Introduction:

In this guide, we will walk through the basics of Spring Boot, including setting up a project and creating a simple REST API. Let’s dive straight into the code.

Github Project link – https://github.com/kuldeep101990/SpringBoot

Step 1: Setting Up a Spring Boot Project

Using Spring Initializr

1. Go to https://start.spring.io/.
2. Fill in the details:
   • Project: Maven
   • Language: Java
   • Spring Boot: 3.x.x
   • Dependencies: Spring Web
3. Click Generate, and extract the downloaded ZIP file.

Import into IDE

• Open your IDE (e.g., IntelliJ or Eclipse).
• Import the extracted project as a Maven project.

Step 2: Writing the “Hello World” REST API

1. Main Application Class & Controller class

The main class is automatically created. Add the @RestController annotation to make it handle HTTP requests.

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);
    }
}

Controller.java
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController

@RestController
public class Controller {

@GetMapping("/")
public String sayHello() {
    return "Hello, World!";
 }
}

Step 4: Running the Application

1. Open the terminal in your IDE.
2. Run the following command: mvn spring-boot:run
3. Alternatively, run the DemoApplication class directly from your IDE.

Step 5: Testing the API

1. Open a browser or Postman.
2. Visit the URL: http://localhost:8080/
3. You should see the response: Hello, World!

Conclusion

Congratulations! You’ve successfully:

1. Set up a Spring Boot project.
2. Created a REST API.