[Practice! ] Display Hello World in Spring Boot

1. Prior knowledge

-[Even beginners can do it! ] How to install Eclipse on Windows 10 (Java environment construction)

As prior knowledge, the contents of the above link are required.

2. Preparation


  1. Start Eclipse. 02.png
  2. Select [Window (W)] → [Open Perspective] → [Other]. 03.png
  3. Select JavaEE and click the Open button. 04.png
  4. Select [Help (H)] → [Eclipse Marketplace (M) ...]. 05.png
  5. Install Spring Tools 4 (aka Spring Tool Suite 4) 4.7.0.RELEASE.

3. Create Spring Boot project

Folder structure

└─ src
     └─ main
          ├─ java
          │   └─ com
          │        └─ example
          │             └─ demo
          │                  ├─ HeloController.java
          │                  └─ HelloApplication.java
          └─ resources
               ├─ application.properties
               ├─ static
               └─ templates
                    └─ index.html


package com.example.demo;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

public class HeloController {
    @RequestMapping(value = "/", method = RequestMethod.GET)
    public String index(Model model) {
        model.addAttribute("message", "Hello Springboot");
        return "index";


<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
    <meta charset="utf-8" />
    <h1>Hello World</h1>
      <span th:text="${message}"></span>!!!


  1. Select [File (F)]-> [New (N)]-> [Spring Starter Project]. 07.png
  2. Enter Hello as the name and click theNext>button. 08.png
  3. Select [Template Engine] → [Thymeleaf] and [Web] → [Spring Web] and click the Finish button. 09.png
  4. Right-click on com.example.demo and select[New] → [Class]. 10.png
  5. Enter HelloController in the name and click theDone (F)button. 11.png
  6. Right-click on templates and select[New] → [Other]. 12.png
  7. Select [Web] → [HTML File] and click the Next button. 13.png
  8. Enter ʻindex.html in Filename (M) and click the Done (F) `button. 14.png
  9. Right-click on Hello [boot] and select [Run] → [5 Maven install].
[INFO] ------------------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  4.125 s
[INFO] Finished at: 2020-07-05T21:50:22+09:00
[INFO] ------------------------------------------------------------------------
  1. Success if the above statement is displayed on the console. 16.png
  2. Right-click on Hello [boot] and select [Run] → [9 Spring Boot Application]. 17.png
  3. Access [localhost: 8080](http: // localhost: 8080 /), and if it looks like the image, it is successful.

4. Related

-[Useful to remember !!!] Easy creation of constructor and getter / setter in Eclipse -[Useful to remember !!!] Easy creation of inherited class in Eclipse -[Useful to remember !!!] Change MySQL character code -[Even beginners can do it! ] How to write Javadoc -[Easy-to-understand explanation! ] How to use Java overload -[Easy-to-understand explanation! ] How to use Java encapsulation -[Easy-to-understand explanation! ] How to use Java inheritance [Override explanation] -[Easy-to-understand explanation! ] Type conversion of reference type in Java -[Easy-to-understand explanation! ] How to use Java polymorphism -[Easy-to-understand explanation! ] How to use ArrayList [Java] -[Practice! ] Introduction of JFrame (explanation up to screen creation) -[Practice! ] Java database linkage (Connector / J 8.0.20) -[Practice! ] Execution of SQL statement -All about Java programming

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