You can install a plugin called Spring Boot Assistant, Spring initializr and assistant:
Now you can use the initializer as:
Declare some project information such as:
- Project type: is to choose what kind of package manager, Maven or Gradle.
- Language: Choose the code language, here I choose Java
- Type of build file: With Spring Boot, you should choose JAR to help configure the Tomcat server
- Java version: Choose java 8
Choose dependencies (can be understood as auxiliary libraries)
- Lombok: recommended, it makes Java code shorter, but need to install Lombok plugin in IDE too
- Thymeleaf: Thymeleaf will help pass data into the view of the MVC model, returning an HTML page with data to the client
- Spring Web: Build web, including RESTful, applications using Spring MVC. Uses Apache Tomcat as the default embedded container.
- Spring configuration processor: Generate metadata for developers to offer contextual help and "code completion" when working with custom configuration keys (ex.application.properties/.yml files).
Click Create to generate project. When display project, click "Load Maven Project"
Click on the green arrow to run the project
Create a simple controller in Spring Boot
Create a "controller" folder to store controller files. Then create the file "DemoController" and write the following code to create the following controller:
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class DemoController {
@RequestMapping("/hello")
public String sayHello(@RequestParam(value = "name") String name) {
return "<h1>Hello " + name + "!</h1>";
}
}
Run main function:
Spring Boot vs Thymeleaf
Create a simple controller
Thymeleaf + Static files
For Thymeleaf template files, put in src/main/resources/templates/
Create index.html file
<!DOCTYPE HTML>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<title>Spring Boot Thymeleaf Hello World Example</title>
<link rel="stylesheet" th:href="@{css/bootstrap.min.css}"/>
<link rel="stylesheet" th:href="@{css/main.css}"/>
</head>
<body>
<nav class="navbar navbar-expand-md navbar-dark bg-dark fixed-top">
<a class="navbar-brand" href="#">TopTech</a>
</nav>
<main role="main" class="container">
<div class="starter-template">
<h1>Spring Boot Web Thymeleaf Example</h1>
<h2>
<span th:text="'Hello, ' + ${message}"></span>
</h2>
</div>
<ol>
<li th:each="task : ${tasks}" th:text="${task}"></li>
</ol>
</main>
</body>
<script type="text/javascript" th:src="@{js/bootstrap.min.js}"></script>
</html>
Edit application.properties
For Static files like CSS or JS, put in src/main/resources/static/
Download the bootstrap.min.css library and place it in the src/main/resources/static/css directory
Download the bootstrap.min.js library and place it in the src/main/resources/static/js directory
Demo
Run main function:
Source code
https://github.com/java-cake/spring-boot/tree/main/helloworld
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