[JAVA] [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

Start Eclipse.
Select [Window (W)] → [Open Perspective] → [Other].
Select JavaEE and click the Open button.
Select [Help (H)] → [Eclipse Marketplace (M) ...].
Install Spring Tools 4 (aka Spring Tool Suite 4) 4.7.0.RELEASE.

3. Create Spring Boot project

`Folder structure`


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

`HeloController.java`


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;

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

`index.html`


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

Select [File (F)]-> [New (N)]-> [Spring Starter Project].
Enter Hello as the name and click theNext>button.
Select [Template Engine] → [Thymeleaf] and [Web] → [Spring Web] and click the Finish button.
Right-click on com.example.demo and select[New] → [Class].
Enter HelloController in the name and click theDone (F)button.
Right-click on templates and select[New] → [Other].
Select [Web] → [HTML File] and click the Next button.
Enter ʻindex.html in Filename (M) and click the Done (F) `button.
Right-click on Hello [boot] and select [Run] → [5 Maven install].

HelloController.java and ʻindex.html` are [described above](# 3spring-boot-create project).

[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  4.125 s
[INFO] Finished at: 2020-07-05T21:50:22+09:00
[INFO] ------------------------------------------------------------------------

Success if the above statement is displayed on the console.
Right-click on Hello [boot] and select [Run] → [9 Spring Boot Application].
Access [localhost: 8080](http: // localhost: 8080 /), and if it looks like the image, it is successful.

[JAVA] [Practice! ] Display Hello World in Spring Boot

1. Prior knowledge

2. Preparation

3. Create Spring Boot project

Folder structure

HeloController.java

index.html

4. Related

`Folder structure`

`HeloController.java`

`index.html`