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BAEL-1308 - Copy a File with Java (eugenp#3000)
* Create Student.java * Create ApplicationContextTestBeanInjection.java * Update Student.java * added tests added tests * BAEL-1308 part 1 * Create test_stream.txt * Create test_files.txt * Create test_channel.txt * Create test_apache.txt * Create test.txt * Delete test.txt * Create readme.txt * Delete Student.java * Delete StudentInjectionTest.java * Delete ApplicationContextTestBeanInjection.java
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‎core-java/src/main/java/com/baeldung/stream/FileCopy.java‎

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package com.baeldung.stream;
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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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import java.nio.channels.FileChannel;
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import java.nio.file.Files;
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import org.apache.commons.io.FileUtils;
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public class FileCopy {
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public static void copyFileUsingStream(File source, File dest) throws IOException {
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InputStream is = null;
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OutputStream os = null;
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is = new FileInputStream(source);
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os = new FileOutputStream(dest);
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byte[] buffer = new byte[1024];
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int length;
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while ((length = is.read(buffer)) > 0) {
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os.write(buffer, 0, length);
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}
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is.close();
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os.close();
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}
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public static void copyFileUsingChannel(File source, File dest) throws IOException {
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FileChannel sourceChannel = null;
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FileChannel destChannel = null;
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sourceChannel = new FileInputStream(source).getChannel();
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destChannel = new FileOutputStream(dest).getChannel();
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destChannel.transferFrom(sourceChannel, 0, sourceChannel.size());
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sourceChannel.close();
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destChannel.close();
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}
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public static void copyFileUsingApacheCommonsIO(File source, File dest) throws IOException {
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FileUtils.copyFile(source, dest);
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}
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public static void copyFileUsingJavaFiles(File source, File dest) throws IOException {
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Files.copy(source.toPath(), dest.toPath());
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}
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}

‎core-java/src/test/java/com/baeldung/stream/FileCopyTest.java‎

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package com.baeldung.stream;
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import static org.junit.Assert.assertTrue;
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import java.io.File;
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import java.io.IOException;
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import org.junit.Test;
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public class FileCopyTest {
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@Test
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public void whenUsingStream_thenCopyFile() throws IOException {
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File src = new File("src" + File.separator + "test" + File.separator + "resources" + File.separator + "copyTest" + File.separator + "src" + File.separator + "test_stream.txt");
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File dest = new File("src" + File.separator + "test" + File.separator + "resources" + File.separator + "copyTest" + File.separator + "dest" + File.separator + "test_stream.txt");
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FileCopy.copyFileUsingStream(src, dest);
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assertTrue(dest.exists());
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dest.delete();
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}
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@Test
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public void whenUsingFiles_thenCopyFile() throws IOException {
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File src = new File("src" + File.separator + "test" + File.separator + "resources" + File.separator + "copyTest" + File.separator + "src" + File.separator + "test_files.txt");
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File dest = new File("src" + File.separator + "test" + File.separator + "resources" + File.separator + "copyTest" + File.separator + "dest" + File.separator + "test_files.txt");
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FileCopy.copyFileUsingJavaFiles(src, dest);
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assertTrue(dest.exists());
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dest.delete();
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}
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@Test
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public void whenUsingChannel_thenCopyFile() throws IOException {
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File src = new File("src" + File.separator + "test" + File.separator + "resources" + File.separator + "copyTest" + File.separator + "src" + File.separator + "test_channel.txt");
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File dest = new File("src" + File.separator + "test" + File.separator + "resources" + File.separator + "copyTest" + File.separator + "dest" + File.separator + "test_channel.txt");
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FileCopy.copyFileUsingChannel(src, dest);
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assertTrue(dest.exists());
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dest.delete();
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}
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@Test
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public void whenUsingApache_thenCopyFile() throws IOException {
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File src = new File("src" + File.separator + "test" + File.separator + "resources" + File.separator + "copyTest" + File.separator + "src" + File.separator + "test_apache.txt");
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File dest = new File("src" + File.separator + "test" + File.separator + "resources" + File.separator + "copyTest" + File.separator + "dest" + File.separator + "test_apache.txt");
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FileCopy.copyFileUsingApacheCommonsIO(src, dest);
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assertTrue(dest.exists());
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dest.delete();
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}
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}

‎core-java/src/test/resources/copyTest/dest/readme.txt‎

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files will be copied here and then deleted
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remove `file.delete()` to see the files here

‎core-java/src/test/resources/copyTest/src/test_apache.txt‎

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apache

‎core-java/src/test/resources/copyTest/src/test_channel.txt‎

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channel

‎core-java/src/test/resources/copyTest/src/test_files.txt‎

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files

‎core-java/src/test/resources/copyTest/src/test_stream.txt‎

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stream

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