Step By Step Create a Hello World page with Spring Boot in 10 steps

Create your Spring Boot project in 10 steps:

4. Create a new directory for your project and navigate to it.

5. Create a new file called build.gradle in your project directory and add the following content to it:

   plugins {
       id 'org.springframework.boot' version '2.3.5.RELEASE'
       id 'java'
   }
   
   repositories {
       mavenCentral()
   }
   
   dependencies {
       implementation 'org.springframework.boot:spring-boot-starter-web'
   }
   
   

   This file defines the dependencies for your project and tells Gradle to use the Spring Boot and Java plugins.

6. Create a new directory called src/main/java and create a new file called HelloWorldApplication.java inside it with the following content:
   

   import org.springframework.boot.SpringApplication;
   import org.springframework.boot.autoconfigure.SpringBootApplication;
   
   @SpringBootApplication
   public class HelloWorldApplication {
   
       public static void main(String[] args) {
           SpringApplication.run(HelloWorldApplication.class, args);
       }
   }
   

   This is the main class of your Spring Boot application. It tells Spring to start the application from this class.

7. In the same directory, create a new file called HelloWorldController.java with the following content:
   

   import org.springframework.web.bind.annotation.GetMapping;
   import org.springframework.web.bind.annotation.RestController;
   
   @RestController
   public class HelloWorldController {
   
       @GetMapping("/hello")
       public String helloWorld() {
           return "Hello, World!";
       }
   }
   

   This is a simple controller that maps the /hello path to a method that returns the string "Hello, World!".

8. To build and run the application, navigate to the project directory in a terminal and type:
   

   gradle build
   

   This will build the project and create a jar file in the build/libs directory.

9. To run the application, type:
   

   java -jar build/libs/your-project-name.jar

   This will start the application on port 8080.

10. Open a web browser and navigate to http://localhost:8080/hello to see the "Hello, Spring!" message.

That's it! You have successfully created a "Hello, Spring!" controller using the Gradle build system. You can now customize the controller to add more functionality to your application.