Hello Friends, Today we will understand and write our Spring Boot REST API from scratch. We will go through the pre-requisites and later will write the code.

Tip : If you are new to java, Please visit this link to have better understanding of Java.

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The requirement for running our first Spring Boot Application.

For executing any Spring Boot program, the following steps must be followed.

• A favorite text editor or IDE. I will be using Eclipse(Spring Tool Suite (STS))
• JDK 1.8 or later
• Maven 3.2+

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Creating Spring Boot Project

Navigate to start.spring.io in your favorite browser. This is spring intializr which helps us to create a skeleton for our application.

• Add project metadata as you like or you can refer to the screenshot below.
• Choose either Maven and packaging as jar.
• Click Dependencies and select Spring Web.
• Click Generate and a Zip will be downloaded. This will contain all the required files for your project like the main class and pom.xml

• unZip the Package and Import the project into IDE.

• Once you import give some time to maven to import the required libraries. The project will look like the below once all dependencies are imported.

• Now create a package with the name Controller.

• Now that the package is ready we will add a controller to our application. create a new class with the name HelloController.java.

• Add the below code to the class.

package com.example.FirstAPI.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class HelloController {
@GetMapping("/")
 public String index() {
  return "Greetings from Spring Boot!";
 }
}

• Run the application.

Suppose you are not getting the option to run the application as a spring boot application. Run it as a Java Application and give FirstApiApplication.java as an entry point.

• Output Logs

Our Application is UP.

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Running the API.

Go to the browser and hit localhost:8080

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Thanks for reading. I hope this story was helpful.

If you are interested, check out my other articles.

you can also visit shubhamdeshmukh.com.