Spring Boot 4 Complete Guide · 课时

了解 Spring Boot 项目结构

浏览一个刚生成的 Spring Boot 4 项目，了解其中的文件夹、构建文件以及每个生成构件的作用。

了解 Spring Boot 项目结构 是 CoddyKit 上的免费 Spring Boot 4 Complete Guide 课时。这是第 4 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。

What You Get from Spring Initializr

Spring Initializr hands you a ready-to-run skeleton: a build file, a main class, a properties file, and a test class. Knowing each part lets you navigate with confidence.

The Build File

The build file — pom.xml for Maven, build.gradle for Gradle — declares your dependencies, Java version, and the Spring Boot plugin that packages the app.

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-web</artifactId>
</dependency>

Starter Dependencies

A starter is a curated bundle of libraries. spring-boot-starter-web pulls in everything for a web app, so you never juggle individual versions.

The Main Application Class

The main class is your entry point: annotated with @SpringBootApplication and holding a standard Java main method that boots the framework.

@SpringBootApplication
public class DemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

Standard Source Layout

Stick to the convention: code in src/main/java, config and assets in src/main/resources, and tests under src/test. Spring Boot finds it all automatically.

The Resources Folder

The resources folder holds application.properties (or .yml) for config, static/ for assets, and templates/ for views.

server.port=8080
spring.application.name=demo

Why Package Placement Matters

Spring Boot scans from your main class's package downward. Keep controllers and services in sub-packages of that root so they're discovered automatically.

The Maven/Gradle Wrapper

The wrapper scripts (mvnw, gradlew) let anyone build the project without installing Maven or Gradle, locking in a consistent tool version.

./mvnw spring-boot:run

Generated Test Class

Initializr adds a context-load test with @SpringBootTest. If the application context starts cleanly, the test passes — proving your wiring is valid.

@SpringBootTest
class DemoApplicationTests {
    @Test
    void contextLoads() {
    }
}

Build Artifacts

Building outputs to target/ (Maven) or build/ (Gradle), including a runnable fat JAR that bundles your code plus an embedded server.

Running the Application

You can run the app three ways: from your IDE, via the wrapper, or by executing the packaged JAR. All three start the embedded server.

java -jar target/demo-0.0.1-SNAPSHOT.jar

Quick Check

Can you place each piece of the project structure? Let's find out.

Recap

You toured the build file, starters, main class, resources, source layout, wrappers, and artifacts. Knowing this structure makes the rest of Spring Boot click.

常见问题解答

「了解 Spring Boot 项目结构」课时是免费的吗？

是的 — 「了解 Spring Boot 项目结构」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。

「了解 Spring Boot 项目结构」这节课中我会学到什么？

浏览一个刚生成的 Spring Boot 4 项目，了解其中的文件夹、构建文件以及每个生成构件的作用。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 4 节课，共 4 节。

「了解 Spring Boot 项目结构」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。

此课程中的所有课时

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