注意事项
使用Spring Initializr可以快速生成一个Spring Boot工程。Spring Initializr既可以在网页端使用，也可以在IDEA Ultimate版本中使用。（Community版本不行；使用IDEA里的Spring Initializr时需要连接网络）
参考链接Tutorial: Create your first Spring application | IntelliJ IDEA Documentation (jetbrains.com)
需要注意的是，此方法在New Project窗口时，需要把默认的Gradle修改为Maven。
同时，Java版本应该是17或者20,。Java8现已不受支持。
本教程使用IDEA Ultimate 2023.1，Oracle OpenJDK20，Java17，Spring Boot3.0.6.
详细步骤
新建工程
在IDEA中点击File – New – Project，在左边边栏中选择Spring Initializr。
之后，将项目名称命名为spring-boot-tutorial（如果使用Jetbrains教程中的代码，建议按这个名称走，后面就不用改了）
Type选择Maven。（IDEA2023.1默认是Gradle）
Java版本选择17或者20。
点击Next，添加依赖。按照教程，选择Web – Spring Web。
点击Create。
运行HelloWorld
在src/main/java/com/example/springboottutorial/SpringBootTutorialApplication.java文件中写入以下代码
package com.example.springboottutorial;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
@SpringBootApplication
@RestController
public class SpringBootTutorialApplication {
public static void main(String[] args) {
SpringApplication.run(SpringBootTutorialApplication.class, args);
}
@GetMapping("/hello")
public String sayHello(@RequestParam(value = "myName", defaultValue = "World") String name) {
return String.format("Hello %s!", name);
}
}之后，在IDEA中运行项目，然后访问 http://localhost:8080/hello 即可看到Hello World。
如果IDEA中不能直接通过“运行”（绿色三角）按钮来无痛的运行项目，说明配置出了一些问题。
What's more
The created Spring Boot application has one endpoint available at /hello. However, if you open the root context of your application at http://localhost:8080/, you will get an error because there is no root resource defined. Let's add a static HTML home page with links to your endpoint.
1.Create the index.html file under /src/main/resources/static/.
In the Project tool window, right-click the /src/main/resources/static/ directory, select New | HTML File, specify the name index.html, and press Enter.
2.Modify the default template or replace it with the following HTML code:
```html
<!DOCTYPE HTML>
<html>
<head>
<title>Your first Spring application</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
<p><a href="/hello">Greet the world!</a></p>
<form action="/hello" method="GET" id="nameForm">
<div>
<label for="nameField">How should the app call you?</label>
<input name="myName" id="nameField">
<button>Greet me!</button>
</div>
</form>
</body>
</html>
3.In the Run tool window, click The Rerun button or press Shift+F10 to restart your Spring application.
Now your application will serve index.html as the root resource at http://localhost:8080/
frank
Thanks a lot for your sharing!!!
Frank
I completed the simple demo successfully and smoothly following the tutorial in the link your shared. Thanks a lot again!