[JAVA] (IntelliJ + gradle) Hello World with Spring Boot


I want to develop Spring Boot with IntelliJ. Since the development project I am currently involved in is this combination, I built it to study the mechanism. I want to make a REST API that works with mysql.

--Environmental information - Windows10 - IntelliJ IDEA Community Edition 2019.1.1 - Spring Boot 2.1.5

Project creation

Create a project template with Spring Initializr linked below. https://start.spring.io/


--Project: Select [Gradle Project] --Language: As it is --Spring Boot: As it is --Project Metadata: As is --Dependencies: Added [Spring Web Starter]

After setting


After completing the settings, click the "Generate the project" button at the bottom of the screen. The project zip will be downloaded, so unzip it.

Project import

  1. Select "build.gradle" from the unzipped folder in Explorer and right-click. Open from program → select IntelliJ
  2. The IntelliJ dialog will be displayed, so click OK without changing anything. (Maybe you need to choose jdk) paste.png
  3. Wait for the build to finish.
  4. When finished, it should have the following configuration. paste2.png

Edit to display Hello World

  1. Edit DemoApplication.java as follows.


package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

public class DemoApplication {

	String index(){
		return "Hello World!";

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


to start

From the Gradle window, execute Tasks → application → bootRun.

Post-execution console paste3.png

Check with browser

Connect to http: // localhost: 8080 /. Hello World is output!


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