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mkyongmkyong
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get file from resources
1 parent c81335c commit 5130a7f

11 files changed

Lines changed: 331 additions & 11 deletions

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‎java-io/pom.xml‎

Lines changed: 43 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -71,17 +71,58 @@
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</dependencies>
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<build>
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<finalName>java11</finalName>
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<finalName>java-io</finalName>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.8.0</version>
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<version>3.8.1</version>
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<configuration>
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<source>${java.version}</source>
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<target>${java.version}</target>
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</configuration>
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</plugin>
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<!-- Make this jar executable -->
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-jar-plugin</artifactId>
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<version>3.2.0</version>
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<configuration>
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<excludes>
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<exclude>**/log4j.properties</exclude>
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</excludes>
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<archive>
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<manifest>
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<addClasspath>true</addClasspath>
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<mainClass>com.mkyong.io.howto.resources.FileResourcesUtils</mainClass>
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<classpathPrefix>dependency-jars/</classpathPrefix>
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</manifest>
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</archive>
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</configuration>
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</plugin>
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<!-- Copy project dependency -->
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-dependency-plugin</artifactId>
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<version>3.1.2</version>
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<executions>
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<execution>
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<id>copy-dependencies</id>
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<phase>package</phase>
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<goals>
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<goal>copy-dependencies</goal>
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</goals>
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<configuration>
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<!-- exclude junit, we need runtime dependency only -->
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<includeScope>runtime</includeScope>
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<outputDirectory>${project.build.directory}/dependency-jars/</outputDirectory>
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</configuration>
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</execution>
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</executions>
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</plugin>
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</plugins>
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</build>
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</project>

‎java-io/src/main/java/com/mkyong/HelloApp.java‎

Lines changed: 0 additions & 9 deletions
This file was deleted.

‎java-io/src/main/java/com/mkyong/io/howto/resources/FileResourcesUtils.java‎

Lines changed: 148 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,148 @@
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package com.mkyong.io.howto.resources;
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import java.io.*;
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import java.net.URI;
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import java.net.URISyntaxException;
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import java.net.URL;
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import java.nio.charset.StandardCharsets;
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import java.nio.file.FileSystem;
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import java.nio.file.*;
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import java.util.Collections;
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import java.util.List;
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import java.util.stream.Collectors;
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public class FileResourcesUtils {
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public static void main(String[] args) throws IOException {
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//String fileName = "database.properties";
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String fileName = "json/file1.json";
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FileResourcesUtils app = new FileResourcesUtils();
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System.out.println("getResourceAsStream : " + fileName);
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InputStream is = app.getFileFromResourceAsStream(fileName);
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printInputStream(is);
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System.out.println("\ngetResource : " + fileName);
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File file = app.getFileFromResource(fileName);
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printFile(file);
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// get all files from a resources folder (JAR version)
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/*try {
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List<Path> result = app.getPathsFromResourceJAR();
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for (Path path : result) {
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System.out.println("Path : " + path);
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InputStream is = app.getFileFromResourceAsStream(path.toString());
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printInputStream(is);
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}
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} catch (URISyntaxException e) {
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e.printStackTrace();
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}*/
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}
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// get a file from resources folder
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// works in everywhere, IDEA, unit test and JAR file.
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private InputStream getFileFromResourceAsStream(String fileName) {
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// The class loader that loaded the class
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ClassLoader classLoader = getClass().getClassLoader();
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InputStream inputStream = classLoader.getResourceAsStream(fileName);
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if (inputStream == null) {
58+
throw new IllegalArgumentException("file not found! " + fileName);
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} else {
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return inputStream;
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}
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}
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// The a resource URL is not working in JAR file
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// Exception in thread "main" java.nio.file.NoSuchFileException:
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// file:/home/mkyong/projects/core-java/java-io/target/java-io.jar!/json/file1.json
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private File getFileFromResource(String fileName) {
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ClassLoader classLoader = getClass().getClassLoader();
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URL resource = classLoader.getResource(fileName);
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if (resource == null) {
74+
throw new IllegalArgumentException("file not found! " + fileName);
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} else {
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return new File(resource.getFile());
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}
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}
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// Get all path from the JAR file
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private List<Path> getPathsFromResourceJAR() throws URISyntaxException, IOException {
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List<Path> result;
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// get path of the running JAR
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String jarPath = getClass().getProtectionDomain().getCodeSource().getLocation().toURI().getPath();
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System.out.println("path :" + jarPath);
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URI uri = URI.create("jar:file:" + jarPath);
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try (FileSystem fs = FileSystems.newFileSystem(uri, Collections.emptyMap())) {
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// get paths from src/main/resources/json
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result = Files.walk(fs.getPath("json"))
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.filter(Files::isRegularFile)
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.collect(Collectors.toList());
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}
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return result;
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}
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// Works in IDE and unit test, not working in JAR
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private List<File> getAllFilesFromResource() throws URISyntaxException, IOException {
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ClassLoader classLoader = getClass().getClassLoader();
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// src/main/resources/json
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URL resource = classLoader.getResource("json");
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List<File> collect = Files.walk(Paths.get(resource.toURI()))
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.filter(Files::isRegularFile)
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.map(x -> x.toFile())
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.collect(Collectors.toList());
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return collect;
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}
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// print input stream
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private static void printInputStream(InputStream inputStream) throws IOException {
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try (InputStreamReader streamReader =
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new InputStreamReader(inputStream, StandardCharsets.UTF_8);
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BufferedReader reader = new BufferedReader(streamReader)) {
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String line;
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while ((line = reader.readLine()) != null) {
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System.out.println(line);
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}
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}
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}
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// print a file
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private static void printFile(File file) {
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List<String> lines;
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try {
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lines = Files.readAllLines(file.toPath(), StandardCharsets.UTF_8);
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lines.forEach(System.out::println);
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}

‎java-io/src/main/java/com/mkyong/io/howto/resources/TestApp.java‎

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package com.mkyong.io.howto.resources;
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import java.net.URISyntaxException;
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public class TestApp {
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public static void main(String[] args) {
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TestApp obj = new TestApp();
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//obj.getFileFromResources(null);
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try {
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String jarPath = TestApp.class
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.getProtectionDomain()
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.getCodeSource()
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.getLocation()
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.toURI()
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.getPath();
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System.out.println("JAR Path : " + jarPath);
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String jarPath2 = TestApp.class
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.getProtectionDomain()
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.getCodeSource()
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.getLocation()
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.getPath();
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System.out.println("JAR Path 2 : " + jarPath2);
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//String jarName = jarPath.substring(jarPath.lastIndexOf("/") + 1);
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//System.out.printf("JAR Name: " + jarName);
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} catch (URISyntaxException e) {
33+
e.printStackTrace();
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}
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}
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/*private InputStream getFileFromResources(List<String> fileNames) throws URISyntaxException, IOException {
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ClassLoader classLoader = getClass().getClassLoader();
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URL resource = classLoader.getResource("json");
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String path = TestApp.class.getProtectionDomain().getCodeSource().getLocation().toURI().getPath();
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System.out.println("path 1:" + path);
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System.out.println(resource);
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URI uri = URI.create("jar:file:/home/mkyong/projects/core-java/java-io/target/java-io.jar");
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51+
try (FileSystem zipfs = FileSystems.newFileSystem(uri, Collections.emptyMap())) {
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List<Path> collect = Files.walk(zipfs.getPath("json"), 5)
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.filter(Files::isRegularFile)
55+
//.map(x -> )
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.collect(Collectors.toList());
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collect.forEach(x -> System.out.println(x));
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}
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//InputStream inputStream = classLoader.getResourceAsStream(fileName);
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return null;
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}
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private String getPathOfRunningJAR() {
69+
70+
String result = null;
71+
try {
72+
result = getClass().getProtectionDomain().getCodeSource().getLocation().toURI().getPath();
73+
} catch (URISyntaxException e) {
74+
e.printStackTrace();
75+
}
76+
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return result;
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}*/
80+
}

‎java-io/src/main/resources/database.properties‎

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datasource.url=jdbc:mysql://localhost/mkyong?useSSL=false
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datasource.username=root
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datasource.password=password
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datasource.driver-class-name=com.mysql.jdbc.Driver

‎java-io/src/main/resources/json/file1.json‎

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{
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"name": "mkyong",
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"age": 38
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}

‎java-io/src/main/resources/json/file2.json‎

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{
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"name": "jack",
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"age": 40
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}

‎java-io/src/main/resources/json/sub/subfile1.json‎

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Original file line numberDiff line numberDiff line change
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{
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"name": "sub",
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"age": 99
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}

‎java-io/src/test/java/com.mkyong.io/FileResourcesTest.java‎

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package com.mkyong.io;
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import org.junit.jupiter.api.DisplayName;
4+
import org.junit.jupiter.api.Test;
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import java.io.BufferedReader;
7+
import java.io.IOException;
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import java.io.InputStream;
9+
import java.io.InputStreamReader;
10+
import java.nio.charset.StandardCharsets;
11+
12+
public class FileResourcesTest {
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@DisplayName("Test loading a JSON file")
15+
@Test
16+
void loadJSONTest() {
17+
18+
String fileName = "database.properties";
19+
//String fileName = "json/file1.json";
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ClassLoader classLoader = getClass().getClassLoader();
22+
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try (InputStream inputStream = classLoader.getResourceAsStream(fileName);
24+
InputStreamReader streamReader = new InputStreamReader(inputStream, StandardCharsets.UTF_8);
25+
BufferedReader reader = new BufferedReader(streamReader)) {
26+
27+
String line;
28+
while ((line = reader.readLine()) != null) {
29+
System.out.println(line);
30+
}
31+
32+
} catch (IOException e) {
33+
e.printStackTrace();
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}
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}
36+
}

‎java-io/src/test/resources/database.properties‎

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@@ -0,0 +1,4 @@
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datasource.url=jdbc:mysql://localhost/test?useSSL=false
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datasource.username=test
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datasource.password=password
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datasource.driver-class-name=com.mysql.jdbc.Driver

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