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‎core-java-modules/core-java-io-3/src/main/java/com/baeldung/copyfolder/ApacheCommons.java‎

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package com.baeldung.copyfolder;
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import java.io.File;
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import java.io.IOException;
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import org.apache.commons.io.FileUtils;
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public class ApacheCommons {
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public static void copyDirectory(String sourceDirectoryLocation, String destinationDirectoryLocation) throws IOException {
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File sourceFolder = new File(sourceDirectoryLocation);
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File destinationFolder = new File(destinationDirectoryLocation);
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FileUtils.copyDirectory(sourceFolder, destinationFolder);
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}
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}

‎core-java-modules/core-java-io-3/src/main/java/com/baeldung/copyfolder/CoreOld.java‎

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package com.baeldung.copyfolder;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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public class CoreOld {
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public static void copyDirectoryJavaUnder7(File source, File destination) throws IOException {
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if (source.isDirectory()) {
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copyDirectory(source, destination);
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} else {
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copyFile(source, destination);
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}
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}
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private static void copyDirectory(File sourceFolder, File destinationFolder) throws IOException {
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if (!destinationFolder.exists()) {
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destinationFolder.mkdir();
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}
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for (String f : sourceFolder.list()) {
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copyDirectoryJavaUnder7(new File(sourceFolder, f), new File(destinationFolder, f));
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}
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}
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private static void copyFile(File sourceFile, File destinationFile) throws IOException {
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try (InputStream in = new FileInputStream(sourceFile); OutputStream out = new FileOutputStream(destinationFile)) {
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byte[] buf = new byte[1024];
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int length;
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while ((length = in.read(buf)) > 0) {
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out.write(buf, 0, length);
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}
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}
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}
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}

‎core-java-modules/core-java-io-3/src/main/java/com/baeldung/copyfolder/JavaNio.java‎

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package com.baeldung.copyfolder;
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import java.io.IOException;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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public class JavaNio {
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public static void copyDirectory(String sourceDirectoryLocation, String destinationDirectoryLocation) throws IOException {
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Files.walk(Paths.get(sourceDirectoryLocation))
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.forEach(a -> {
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Path b = Paths.get(destinationDirectoryLocation, a.toString()
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.substring(sourceDirectoryLocation.length()));
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try {
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Files.copy(a, b);
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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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}
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}

‎core-java-modules/core-java-io-3/src/test/java/com/baeldung/copyfolder/ApacheCommonsUnitTest.java‎

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package com.baeldung.copyfolder;
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import static org.junit.Assert.assertTrue;
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import static org.junit.jupiter.api.Assertions.assertThrows;
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import java.io.File;
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import java.io.IOException;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.util.Comparator;
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import org.junit.jupiter.api.AfterEach;
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import org.junit.jupiter.api.BeforeEach;
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import org.junit.jupiter.api.Test;
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public class ApacheCommonsUnitTest {
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private final String sourceFolderLocation = "src/test/resources/sourceFolder";
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private final String subFolderName = "/childFolder";
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private final String fileName = "/file.txt";
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private final String destinationFolderLocation = "src/test/resources/destinationFolder";
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@BeforeEach
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public void createFolderWithSubfolderAndFile() throws IOException {
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Files.createDirectories(Paths.get(sourceFolderLocation));
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Files.createDirectories(Paths.get(sourceFolderLocation + subFolderName));
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Files.createFile(Paths.get(sourceFolderLocation + subFolderName + fileName));
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}
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@Test
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public void whenSourceFolderExists_thenFolderIsFullyCopied() throws IOException {
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ApacheCommons.copyDirectory(sourceFolderLocation, destinationFolderLocation);
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assertTrue(new File(destinationFolderLocation).exists());
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assertTrue(new File(destinationFolderLocation + subFolderName).exists());
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assertTrue(new File(destinationFolderLocation + subFolderName + fileName).exists());
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}
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@Test
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public void whenSourceFolderDoesNotExist_thenExceptionIsThrown() {
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assertThrows(Exception.class, () -> ApacheCommons.copyDirectory("nonExistingFolder", destinationFolderLocation));
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}
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@AfterEach
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public void cleanUp() throws IOException {
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Files.walk(Paths.get(sourceFolderLocation))
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.sorted(Comparator.reverseOrder())
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.map(Path::toFile)
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.forEach(File::delete);
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if (new File(destinationFolderLocation).exists()) {
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Files.walk(Paths.get(destinationFolderLocation))
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.sorted(Comparator.reverseOrder())
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.map(Path::toFile)
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.forEach(File::delete);
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}
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}
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}

‎core-java-modules/core-java-io-3/src/test/java/com/baeldung/copyfolder/CoreOldUnitTest.java‎

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package com.baeldung.copyfolder;
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import static org.junit.Assert.assertTrue;
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import static org.junit.jupiter.api.Assertions.assertThrows;
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import java.io.File;
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import java.io.IOException;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.util.Comparator;
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import org.junit.jupiter.api.AfterEach;
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import org.junit.jupiter.api.BeforeEach;
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import org.junit.jupiter.api.Test;
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public class CoreOldUnitTest {
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private final String sourceFolderLocation = "src/test/resources/sourceFolder";
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private final String subFolderName = "/childFolder";
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private final String fileName = "/file.txt";
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private final String destinationFolderLocation = "src/test/resources/destinationFolder";
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@BeforeEach
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public void createFolderWithSubfolderAndFile() throws IOException {
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Files.createDirectories(Paths.get(sourceFolderLocation));
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Files.createDirectories(Paths.get(sourceFolderLocation + subFolderName));
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Files.createFile(Paths.get(sourceFolderLocation + subFolderName + fileName));
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}
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@Test
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public void whenSourceFolderExists_thenFolderIsFullyCopied() throws IOException {
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File sourceFolder = new File(sourceFolderLocation);
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File destinationFolder = new File(destinationFolderLocation);
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CoreOld.copyDirectoryJavaUnder7(sourceFolder, destinationFolder);
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assertTrue(new File(destinationFolderLocation).exists());
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assertTrue(new File(destinationFolderLocation + subFolderName).exists());
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assertTrue(new File(destinationFolderLocation + subFolderName + fileName).exists());
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}
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@Test
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public void whenSourceFolderDoesNotExist_thenExceptionIsThrown() throws IOException {
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File sourceFolder = new File("nonExistingFolder");
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File destinationFolder = new File(destinationFolderLocation);
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assertThrows(IOException.class, () -> CoreOld.copyDirectoryJavaUnder7(sourceFolder, destinationFolder));
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}
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@AfterEach
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public void cleanUp() throws IOException {
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Files.walk(Paths.get(sourceFolderLocation))
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.sorted(Comparator.reverseOrder())
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.map(Path::toFile)
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.forEach(File::delete);
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if (new File(destinationFolderLocation).exists()) {
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Files.walk(Paths.get(destinationFolderLocation))
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.sorted(Comparator.reverseOrder())
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.map(Path::toFile)
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.forEach(File::delete);
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}
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}
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}

‎core-java-modules/core-java-io-3/src/test/java/com/baeldung/copyfolder/JavaNioUnitTest.java‎

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package com.baeldung.copyfolder;
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import static org.junit.Assert.assertTrue;
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import static org.junit.jupiter.api.Assertions.assertThrows;
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import java.io.File;
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import java.io.IOException;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.util.Comparator;
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import org.junit.jupiter.api.AfterEach;
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import org.junit.jupiter.api.BeforeEach;
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import org.junit.jupiter.api.Test;
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public class JavaNioUnitTest {
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private final String sourceFolderLocation = "src/test/resources/sourceFolder";
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private final String subFolderName = "/childFolder";
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private final String fileName = "/file.txt";
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private final String destinationFolderLocation = "src/test/resources/destinationFolder";
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@BeforeEach
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public void createFolderWithSubfolderAndFile() throws IOException {
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Files.createDirectories(Paths.get(sourceFolderLocation));
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Files.createDirectories(Paths.get(sourceFolderLocation + subFolderName));
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Files.createFile(Paths.get(sourceFolderLocation + subFolderName + fileName));
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}
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@Test
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public void whenSourceFolderExists_thenFolderIsFullyCopied() throws IOException {
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JavaNio.copyDirectory(sourceFolderLocation, destinationFolderLocation);
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assertTrue(new File(destinationFolderLocation).exists());
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assertTrue(new File(destinationFolderLocation + subFolderName).exists());
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assertTrue(new File(destinationFolderLocation + subFolderName + fileName).exists());
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}
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@Test
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public void whenSourceFolderDoesNotExist_thenExceptionIsThrown() {
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assertThrows(IOException.class, () -> JavaNio.copyDirectory("nonExistingFolder", destinationFolderLocation));
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}
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@AfterEach
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public void cleanUp() throws IOException {
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Files.walk(Paths.get(sourceFolderLocation))
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.sorted(Comparator.reverseOrder())
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.map(Path::toFile)
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.forEach(File::delete);
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if (new File(destinationFolderLocation).exists()) {
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Files.walk(Paths.get(destinationFolderLocation))
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.sorted(Comparator.reverseOrder())
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.map(Path::toFile)
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.forEach(File::delete);
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}
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}
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}

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