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root = true | ||
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[*] | ||
end_of_line = lf | ||
insert_final_newline = true | ||
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charset = utf-8 | ||
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indent_style = space | ||
indent_size = 4 | ||
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[*.yml] | ||
indent_size = 2 |
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version: 2 | ||
updates: | ||
- package-ecosystem: maven | ||
directory: "/" | ||
schedule: | ||
interval: weekly | ||
open-pull-requests-limit: 10 |
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name: Dependabot auto-merge | ||
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on: pull_request_target | ||
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permissions: | ||
pull-requests: write | ||
contents: write | ||
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jobs: | ||
dependabot: | ||
if: ${{ github.actor == 'dependabot[bot]' }} | ||
uses: lernejo/reusable-workflows/.github/workflows/automerge-dependabot.yml@main | ||
secrets: inherit |
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name: Build | ||
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on: | ||
push: | ||
workflow_dispatch: | ||
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jobs: | ||
build: | ||
strategy: | ||
matrix: | ||
os: [ ubuntu-latest, windows-latest ] | ||
uses: lernejo/reusable-workflows/.github/workflows/ci.yml@main | ||
secrets: inherit | ||
with: | ||
runs-on: ${{ matrix.os }} |
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target/ | ||
!**/src/main/**/target/ | ||
!**/src/test/**/target/ | ||
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### IntelliJ IDEA ### | ||
.idea/ | ||
*.iml | ||
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### Mac OS ### | ||
.DS_Store |
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/* | ||
* Copyright 2007-present the original author or authors. | ||
* | ||
* Licensed under the Apache License, Version 2.0 (the "License"); | ||
* you may not use this file except in compliance with the License. | ||
* You may obtain a copy of the License at | ||
* | ||
* http://www.apache.org/licenses/LICENSE-2.0 | ||
* | ||
* Unless required by applicable law or agreed to in writing, software | ||
* distributed under the License is distributed on an "AS IS" BASIS, | ||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
* See the License for the specific language governing permissions and | ||
* limitations under the License. | ||
*/ | ||
import java.net.*; | ||
import java.io.*; | ||
import java.nio.channels.*; | ||
import java.util.Properties; | ||
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public class MavenWrapperDownloader { | ||
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private static final String WRAPPER_VERSION = "0.5.6"; | ||
/** | ||
* Default URL to download the maven-wrapper.jar from, if no 'downloadUrl' is provided. | ||
*/ | ||
private static final String DEFAULT_DOWNLOAD_URL = "https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/" | ||
+ WRAPPER_VERSION + "/maven-wrapper-" + WRAPPER_VERSION + ".jar"; | ||
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/** | ||
* Path to the maven-wrapper.properties file, which might contain a downloadUrl property to | ||
* use instead of the default one. | ||
*/ | ||
private static final String MAVEN_WRAPPER_PROPERTIES_PATH = | ||
".mvn/wrapper/maven-wrapper.properties"; | ||
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/** | ||
* Path where the maven-wrapper.jar will be saved to. | ||
*/ | ||
private static final String MAVEN_WRAPPER_JAR_PATH = | ||
".mvn/wrapper/maven-wrapper.jar"; | ||
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/** | ||
* Name of the property which should be used to override the default download url for the wrapper. | ||
*/ | ||
private static final String PROPERTY_NAME_WRAPPER_URL = "wrapperUrl"; | ||
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public static void main(String args[]) { | ||
System.out.println("- Downloader started"); | ||
File baseDirectory = new File(args[0]); | ||
System.out.println("- Using base directory: " + baseDirectory.getAbsolutePath()); | ||
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// If the maven-wrapper.properties exists, read it and check if it contains a custom | ||
// wrapperUrl parameter. | ||
File mavenWrapperPropertyFile = new File(baseDirectory, MAVEN_WRAPPER_PROPERTIES_PATH); | ||
String url = DEFAULT_DOWNLOAD_URL; | ||
if(mavenWrapperPropertyFile.exists()) { | ||
FileInputStream mavenWrapperPropertyFileInputStream = null; | ||
try { | ||
mavenWrapperPropertyFileInputStream = new FileInputStream(mavenWrapperPropertyFile); | ||
Properties mavenWrapperProperties = new Properties(); | ||
mavenWrapperProperties.load(mavenWrapperPropertyFileInputStream); | ||
url = mavenWrapperProperties.getProperty(PROPERTY_NAME_WRAPPER_URL, url); | ||
} catch (IOException e) { | ||
System.out.println("- ERROR loading '" + MAVEN_WRAPPER_PROPERTIES_PATH + "'"); | ||
} finally { | ||
try { | ||
if(mavenWrapperPropertyFileInputStream != null) { | ||
mavenWrapperPropertyFileInputStream.close(); | ||
} | ||
} catch (IOException e) { | ||
// Ignore ... | ||
} | ||
} | ||
} | ||
System.out.println("- Downloading from: " + url); | ||
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File outputFile = new File(baseDirectory.getAbsolutePath(), MAVEN_WRAPPER_JAR_PATH); | ||
if(!outputFile.getParentFile().exists()) { | ||
if(!outputFile.getParentFile().mkdirs()) { | ||
System.out.println( | ||
"- ERROR creating output directory '" + outputFile.getParentFile().getAbsolutePath() + "'"); | ||
} | ||
} | ||
System.out.println("- Downloading to: " + outputFile.getAbsolutePath()); | ||
try { | ||
downloadFileFromURL(url, outputFile); | ||
System.out.println("Done"); | ||
System.exit(0); | ||
} catch (Throwable e) { | ||
System.out.println("- Error downloading"); | ||
e.printStackTrace(); | ||
System.exit(1); | ||
} | ||
} | ||
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private static void downloadFileFromURL(String urlString, File destination) throws Exception { | ||
if (System.getenv("MVNW_USERNAME") != null && System.getenv("MVNW_PASSWORD") != null) { | ||
String username = System.getenv("MVNW_USERNAME"); | ||
char[] password = System.getenv("MVNW_PASSWORD").toCharArray(); | ||
Authenticator.setDefault(new Authenticator() { | ||
@Override | ||
protected PasswordAuthentication getPasswordAuthentication() { | ||
return new PasswordAuthentication(username, password); | ||
} | ||
}); | ||
} | ||
URL website = new URL(urlString); | ||
ReadableByteChannel rbc; | ||
rbc = Channels.newChannel(website.openStream()); | ||
FileOutputStream fos = new FileOutputStream(destination); | ||
fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE); | ||
fos.close(); | ||
rbc.close(); | ||
} | ||
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} |
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distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.8/apache-maven-3.9.8-bin.zip | ||
wrapperUrl=https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar |
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= Lire des fichiers en Java | ||
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ifdef::env-github[] | ||
:tip-caption: :bulb: | ||
:note-caption: :information_source: | ||
endif::[] | ||
:hardbreaks-option: | ||
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Préfixé par ✔️, des "checkpoints" pour vous aider à vérifier que vous avez tout bon. | ||
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== Objectif | ||
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Manipuler différentes façons de lire un fichier, et apprendre comment traiter le contenu comme un flux pour limiter l'utilisation de la mémoire. | ||
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== Prérequis | ||
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* Git | ||
* Java 21 | ||
* Maven 3.9.x | ||
* (Optionnel, mais fortement recommandé) IntelliJ edition _community_ 2024 | ||
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--- | ||
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* Sur la page du template https://github.com/lernejo/maven-starter-template, cliquer sur "Use this template" | ||
* ⚠️ Renseigner comme nom de dépôt : *java_load_file_training* | ||
* Marquer le futur dépôt comme *private* | ||
* Une fois le dépôt créé, installer l'app https://github.com/apps/korekto[Korekto] | ||
* Cloner le dépôt en utilisant l'*url SSH* | ||
* La branche par défaut est la branche *main*, c'est sur celle-ci que nous allons travailler | ||
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== Partie 1 | ||
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Afficher le contenu d'un fichier dans la console | ||
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* Créer une nouvelle classe `fr.lernejo.file.Cat` | ||
* Créer une fonction `main` de telle sorte que : | ||
** Le programme prenne un chemin (relatif ou absolu) comme unique argument | ||
** En cas d'absence d'argument, le programme sort avec le code 3 et le message "Missing argument" dans la sortie standard | ||
** Dans le cas de deux arguments ou plus, le programme sort avec le code 4 et le message "Too many arguments" dans la sortie standard | ||
** Dans le cas où le fichier indiqué n'existe pas, le programme sort avec le code 5 et le message "File not found" | ||
** Dans le cas où le chemin indiqué est un répertoire, le programme sort avec le code 6 et le message "A file is required" | ||
** Dans le cas où le fichier fait plus de 3KiB (soit 3*1024 = 3072 bytes), le programme sort avec le code 7 et le message "File too large" | ||
** Dans le cas où le fichier est lisible et fait moins de 3KiB, afficher le contenu du fichier dans la console et sortir | ||
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* ✔️ Running `java -jar target/maven-training.jar README.md` should display the content of the `README.md` file |
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# korekto-load-file-grader | ||
An exercise about loading files in Java | ||
[![Build](https://github.com/lernejo/korekto-load-file-grader/actions/workflows/ci.yml/badge.svg)](https://github.com/lernejo/korekto-load-file-grader/actions/workflows/ci.yml) | ||
[![codecov](https://codecov.io/gh/lernejo/korekto-load-file-grader/branch/main/graph/badge.svg?token=A6kYtPT5DX)](https://codecov.io/gh/lernejo/korekto-load-file-grader) | ||
![License](https://img.shields.io/badge/License-Elastic_License_v2-blue) | ||
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Korekto grader & exercise about loading files in Java. | ||
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Exercise subject: [here](EXERCISE_fr.adoc) |
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