Sprint Boot Simple Service

Spring Boot is a popular Java-based framework for building web applications. It offers several advantages such as easy setup, fast development, and robustness. In this tutorial, we will guide you through the process of building a simple Spring Boot web service using Java.

Before starting, ensure that you have Java installed on your computer. You can download Java from the official website: https://www.java.com/en/download/.

Here are the steps to create a simple Spring Boot web service:

Step 1: Setup Spring Boot project To get started with Spring Boot, you need to set up a new project. You can do this by creating a new Maven project in your IDE, or by using the Spring Initializr web-based tool. In this tutorial, we will use the Spring Initializr to set up our project.

1. Go to the Spring Initializr website: https://start.spring.io/
2. Fill in the necessary details such as Project type, Group, Artifact, and Packaging.
3. Select the latest stable version of Spring Boot.
4. Add the necessary dependencies. For our simple web service, we will add the “Spring Web” and “Spring Boot DevTools” dependencies.
5. Click on “Generate” to download the project.

Step 2: Create a Controller A controller is responsible for handling incoming HTTP requests and sending back the HTTP response. In this step, we will create a simple controller to handle requests.

1. Create a new Java class called “HelloController” in the package “com.example.demo.controller”.
2. Add the “@RestController” annotation to the class to tell Spring that this is a REST controller.
3. Create a method called “hello” that returns a String. Add the “@GetMapping” annotation to the method to map it to the HTTP GET request.
4. In the method body, return a String that says “Hello, world!”.

Your “HelloController” class should look like this:

Step 3: Run the application Now that we have created the controller, we can run the application to see it in action.

1. Open the project in your IDE.
2. Run the “DemoApplication” class.
3. Open your web browser and go to http://localhost:8080/hello. You should see the message “Hello, world!” displayed in your browser.

Congratulations, you have created a simple Spring Boot web service!

To summarize, we have created a Spring Boot project using the Spring Initializr, created a controller to handle HTTP requests, and run the application to test our controller. You can build on this tutorial by adding more controllers, services, and databases to your project.