创建您的第一个应用程序
使用 Spring Initializr 构建基本的“Hello World”应用程序,并探索项目结构。
创建您的第一个应用程序 是 CoddyKit 上的免费 Spring Boot 4 Complete Guide 课时。 这是第 2 节课,共 4 节。 你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。 这是 Spring Boot 4 Complete Guide 学习路径的一部分,你的进度在网页和 CoddyKit 应用中同步。 Spring Boot 4 Complete Guide 课程共包含 4 节课。
本课时的部分内容尚未翻译,以英文显示。
Your First Spring Boot App
Time to build your first app! You'll use Spring Initializr to scaffold a project, then create a simple Hello World and explore its structure.
Meet Spring Initializr
Spring Initializr is a project wizard for Spring. Pick your build tool, language, and version, and it generates the boilerplate so you don't have to.
Launching Initializr
Open Spring Initializr at start.spring.io in your browser. IntelliJ and Eclipse also bundle it right into their New Project dialog.
Project Details
In Initializr you set the basics: build tool (Maven), language (Java), Spring Boot version, plus Group and Artifact to name your project and package.
Core Dependencies
Dependencies are the libraries your app needs. Add Spring Web — it brings everything for web apps, including an embedded Tomcat. Search and add it now.
Generate & Open
Hit Generate to download a zip, unzip it, and import it into your IDE. It'll recognize the Maven project and set things up automatically.
Exploring Your Project
Know your layout: src/main/java for code, src/main/resources for config and assets, src/test/java for tests, and pom.xml for dependencies and build settings.
The Core Class
Your main class is the entry point. It carries @SpringBootApplication and a standard main method that calls SpringApplication.run() to boot the app.
Run Your First App!
Let's print a message at startup using a CommandLineRunner — a component that runs your code right after the application context loads.
package com.example.myfirstapp;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
@SpringBootApplication
public class MyfirstappApplication {
public static void main(String[] args) {
SpringApplication.run(MyfirstappApplication.class, args);
}
@Bean
public CommandLineRunner run(String... args) throws Exception {
return args -> System.out.println("Hello CoddyKit!");
}
}Project Structure Check
Which of these files/folders is typically found in a newly generated Spring Boot project and is used to define its dependencies?
Recap: Your First App
Done! You scaffolded a project with Spring Initializr, added Spring Web, explored the structure, and printed Hello World via a CommandLineRunner. Next: auto-configuration in depth.
常见问题解答
「创建您的第一个应用程序」课时是免费的吗?
是的 — 「创建您的第一个应用程序」的完整文本可在网页上免费阅读。要进行交互式练习(内置代码编辑器和全天候 AI 导师)并解锁 Spring Boot 4 Complete Guide 课程的其余内容,请升级到 CoddyKit PRO。 Spring Boot 4 Complete Guide 课程共包含 4 节课。
「创建您的第一个应用程序」这节课中我会学到什么?
使用 Spring Initializr 构建基本的“Hello World”应用程序,并探索项目结构。 你通过在浏览器中直接运行的动手代码来练习 Spring Boot 4 Complete Guide,全天候 AI 导师会在你学习这节课的过程中回答你的问题。
学习 Spring Boot 4 Complete Guide 需要有经验吗?
无需任何先前经验。CoddyKit 上的 Spring Boot 4 Complete Guide 课程适合初学者到高级学习者,你可以从这里开始或从头开始,按照自己的节奏学习。 这是第 2 节课,共 4 节。
「创建您的第一个应用程序」课时需要多长时间?
大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动,所以你能稳步进步,并在网页和应用中从离开的地方继续。
我能在这节 Spring Boot 4 Complete Guide 课中编写并运行代码吗?
能。每节 Spring Boot 4 Complete Guide 课都包含内置代码编辑器,你可以在浏览器中直接编写并运行真实代码,并获得即时 AI 反馈 — 无需本地设置。