WebSockets & Real-Time Systems with Spring · レッスン

WebSockets向けSpring Boot

Spring Bootプロジェクトをすばやくセットアップし、WebSocketの依存関係を追加する方法を学習します。

「WebSockets向けSpring Boot」はCoddyKit上の無料WebSockets & Real-Time Systems with Springレッスンです。これはレッスン1/4です。下記で完全なレッスンを無料で読むことができます。その後、ブラウザ内の組み込みコードエディタと24時間対応のAIチューターでハンズオン演習できます。これはWebSockets & Real-Time Systems with Spring学習パスの一部であり、ウェブとCoddyKitアプリ全体で進捗が同期されます。 WebSockets & Real-Time Systems with Springコースには全4レッスンが含まれています。

このレッスンの一部はまだ翻訳されておらず、英語で表示されています。

Spring Boot & WebSockets Intro

Welcome! In this lesson, we'll get your first Spring Boot project ready for real-time communication using WebSockets.

Spring Boot makes building powerful Spring applications incredibly easy. When combined with WebSockets, it's a perfect match for creating dynamic, interactive experiences.

Quick Start with Initializr

How do we begin a new Spring Boot project? The quickest and most recommended way is using Spring Initializr. It's a web-based tool that generates a project structure with all the basic setup you need.

You can find it at start.spring.io.

Initializr: Core Dependencies

When using Spring Initializr, you'll select essential dependencies. For our WebSocket application, we need two main ones:

Spring Web: Provides core web functionality, like embedded servers and MVC.
Spring WebSocket: Adds the necessary libraries to enable WebSocket communication.

Make sure to add both of these when generating your project!

Generate and Open Project

After selecting your dependencies on Spring Initializr, click 'Generate' to download a .zip file. Unzip this file and open the project in your preferred Integrated Development Environment (IDE), such as IntelliJ IDEA, VS Code, or Eclipse.

Your IDE will usually detect it as a Maven or Gradle project and set it up automatically.

Project Structure Glance

A newly generated Spring Boot project has a standard, clear structure. You'll primarily work with these:

src/main/java: This is where all your Java source code resides.
src/main/resources: Contains configuration files (like application.properties) and static assets.
pom.xml (for Maven) or build.gradle (for Gradle): Defines project dependencies and build settings.

The pom.xml File

If you chose Maven as your build tool (which is common), the pom.xml file is crucial. It stands for 'Project Object Model' and declares all your project's dependencies and how it should be built.

When you add dependencies via Spring Initializr, they are automatically configured in this file.

WebSocket Dependency in pom.xml

Here's what the spring-boot-starter-websocket dependency looks like in your pom.xml. This 'starter' dependency tells Spring Boot to include all necessary libraries for WebSocket support, simplifying your setup significantly.

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

Your First Spring Boot App

Every Spring Boot application needs a main class with the @SpringBootApplication annotation. This powerful annotation enables auto-configuration, component scanning, and more, making your app ready to run with minimal code.

Try running this example:

package com.coddykit.websocket;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class WebSocketApplication {

  public static void main(String[] args) {
    SpringApplication.run(WebSocketApplication.class, args);
    System.out.println("Spring Boot app started!");
  }
}

Running Your Application

To run your Spring Boot application, you can typically use the 'Run' button in your IDE (often a green triangle icon). Alternatively, from your project's root directory in the command line:

mvn spring-boot:run

You should see 'Spring Boot app started!' in the console, confirming your basic application is up and running!

Dependency Check

To enable WebSocket capabilities in a Spring Boot project, which specific dependency should you ensure is present in your pom.xml?

Recap: Setup Success!

Fantastic work! You've successfully navigated the initial setup for a Spring Boot WebSocket application. You now know how to:

Use Spring Initializr to quickly create a new project.
Identify and add the crucial spring-boot-starter-websocket dependency.
Understand the basic structure of a Spring Boot application.
Run your first minimal Spring Boot app and confirm its startup.

Next, we'll dive into configuring a WebSocket endpoint to start handling connections and messages!

よくある質問

「WebSockets向けSpring Boot」レッスンは無料ですか？

はい。「WebSockets向けSpring Boot」の完全なテキストはこのウェブで無料で読めます。インタラクティブに演習し（組み込みコードエディタと24時間対応のAIチューター）、WebSockets & Real-Time Systems with Springコースの残りをアンロックするには、CoddyKit PROにアップグレードしてください。 WebSockets & Real-Time Systems with Springコースには全4レッスンが含まれています。

「WebSockets向けSpring Boot」で何を学びますか？

Spring Bootプロジェクトをすばやくセットアップし、WebSocketの依存関係を追加する方法を学習します。ブラウザで直接実行するハンズオンコードでWebSockets & Real-Time Systems with Springを演習し、24時間対応のAIチューターがレッスンを進める中での質問に答えます。

WebSockets & Real-Time Systems with Springを始めるのに経験は必要ですか？

事前経験は必要ありません。CoddyKitのWebSockets & Real-Time Systems with Springは初級者から上級者向けに構成されているため、ここから始めるか最初から始めて、自分のペースで進むことができます。これはレッスン1/4です。

「WebSockets向けSpring Boot」レッスンにはどのくらい時間がかかりますか？

ほとんどのCoddyKitレッスンは約5～10分かかります。各レッスンはコンパクトでインタラクティブなので、着実に進歩し、ウェブとアプリ全体で正確に前回の場所から再開できます。

このWebSockets & Real-Time Systems with Springレッスンでコードを書いて実行できますか？

はい。すべてのWebSockets & Real-Time Systems with Springレッスンに組み込みコードエディタが含まれているため、ブラウザでリアルコードを書いて実行し、即座のAIフィードバックを取得できます。ローカル設定は不要です。

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