Introduction

A summary of what to do when creating a web application with Spring Boot.

Prerequisites

Development tools: Pleiades All in One

Preparation

Project creation

Select New Project → Spring Starter Project. When selecting dependencies, it would be good if there were at least the following.

name	Description
Spring Boot DevTools	A tool that allows hot deployment when testing during development
Thymeleaf	HTML template engine
Spring Web Starter	What you need to create a web application

Added Thymeleaf Layout Dialect as a dependency

The layout can be standardized. The version is the latest at that time.

`build.gradle`


dependencies {
	compile group: 'nz.net.ultraq.thymeleaf', name: 'thymeleaf-layout-dialect', version: '2.4.1'
}

First screen creation

HTML creation for layout

Add schema definition for Thymeleaf to html tag.

`layout01.html`


<!DOCTYPE html>
<html
	xmlns:th="http://www.thymeleaf.org"
	xmlns:layout="http://www.ultraq.net.nz/thymeleaf/layout">
<head>
	<meta charset="UTF-8">
	<link rel="stylesheet" href="css/uikit.min.css" th:href="@{css/uikit.min.css}" />
	<script src="js/uikit.min.js" th:src="@{js/uikit.min.js}"></script>
	<script src="js/uikit-icons.min.js" th:src="@{js/uikit-icons.min.js}"></script>
	<title>system-name</title>
</head>
<body>

<!--menu-->
<nav class="uk-navbar-container" uk-navbar>
    <div class="uk-navbar-left">
        <ul class="uk-navbar-nav">
            <li class="uk-active"><a href="">Top</a></li>
            <li><a href=""></a></li>
        </ul>
    </div>
</nav>

<!--Contents-->
<div class="uk-section" layout:fragment="content">
</div>

</body>
</html>

Individual HTML creation

-Add the schema definition for Thymeleaf to the html tag. -Specify which layout file to use. -Add the th: remove tag for what you are doing in the layout file, such as reading css.

`index.html`


<!DOCTYPE html>
<html
	xmlns:th="http://www.thymeleaf.org"
	xmlns:layout="http://www.ultraq.net.nz/thymeleaf/layout"
	layout:decorate="~{layouts/layout01}">
<head>
<meta charset="UTF-8">
<link rel="stylesheet" href="css/uikit.min.css" th:remove="all" />
<script src="js/uikit.min.js" th:remove="all"></script>
<script src="js/uikit-icons.min.js" th:remove="all"></script>
<title>top page</title>
</head>
<body>

<!--Contents-->
<div class="uk-section" layout:fragment="content">
<p>It is the top page</p>
</div>

</body>
</html>

Controller creation

`Controller class`


@Controller
public class IndexController {

	@RequestMapping("/")
	public String get() {
		return "index.html";
	}

}

Application launch

Right-click on the project name → select "Run" → "Spring Boot Application". After confirming the startup, you can access it at http: // localhost: 8080 /.

Source control

Ignore bin folder

When I try to manage the created project with Git, the bin folder and the class files in it are not ignored for some reason. So, add a setting to ignore.

Use of property file values

For DI managed objects, you can use @Value. defaultValue is the default value when there is no key. Optional.

@Value("${key:defaultValue}")
private String value = null;

Disable favicon

By default, the green leaf is an icon, so it's a good idea to disable it.

`application.properties`


spring.mvc.favicon.enabled=false

[JAVA] [Spring Boot] Web application creation