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BAEL-1308 - copy a file with java (Editor Notes)

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This commit is contained in:
Ahmad Alsanie 2017-11-20 18:05:47 +02:00
parent 8b2d647eec
commit cf7c96b469
2 changed files with 55 additions and 73 deletions
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40
core-java/src/main/java/com/baeldung/copyfiles/FileCopier.java
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@ -1,40 +0,0 @@
package com.baeldung.copyfiles;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardCopyOption;
import org.apache.commons.io.FileUtils;
public class FileCopier {
public static File copyWithIO(File original, File copied) throws IOException {
try (InputStream in = new BufferedInputStream(new FileInputStream(original));
OutputStream out = new BufferedOutputStream(new FileOutputStream(copied))) {
byte[] buffer = new byte[1024];
int lengthRead;
while ((lengthRead = in.read(buffer)) > 0) {
out.write(buffer, 0, lengthRead);
out.flush();
}
}
return copied;
}
public static Path copyWithNio(Path original, Path copied) throws IOException {
Files.copy(original, copied, StandardCopyOption.REPLACE_EXISTING);
return copied;
}
public static File copyWithCommonsIO(File original, File copied) throws IOException {
FileUtils.copyFile(original, copied);
return copied;
}
}

88
core-java/src/test/java/com/baeldung/copyfiles/FileCopierTest.java
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@ -1,48 +1,70 @@
package com.baeldung.copyfiles; package com.baeldung.copyfiles;
import static org.junit.Assert.*; import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File; import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException; import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.file.Files; import java.nio.file.Files;
import java.nio.file.Path; import java.nio.file.Path;
import java.nio.file.Paths; import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import org.apache.commons.io.FileUtils;
import org.junit.Before; import org.junit.Before;
import org.junit.Test; import org.junit.Test;
import static org.assertj.core.api.Assertions.*;
public class FileCopierTest { public class FileCopierTest {
File original =new File("src/test/resources/original.txt"); File original = new File("src/test/resources/original.txt");
@Before
public void init() throws IOException{
if(!original.exists())
Files.createFile(original.toPath());
}
@Test
public void givenIoAPI_whenCopied_thenCopyExistsWithSameContents() throws IOException {
File copied = new File("src/test/resources/copiedWithIo.txt");
copied = FileCopier.copyWithIO(original, copied);
assertTrue(copied.exists());
assertTrue(Files.readAllLines(original.toPath())
.equals(Files.readAllLines(copied.toPath())));
}
@Test @Before
public void givenCommonsIoAPI_whenCopied_thenCopyExistsWithSameContents() throws IOException { public void init() throws IOException {
File copied = new File("src/test/resources/copiedWithApacheCommons.txt"); if (!original.exists())
copied = FileCopier.copyWithCommonsIO(original, copied); Files.createFile(original.toPath());
assertTrue(copied.exists()); }
assertTrue(Files.readAllLines(original.toPath())
.equals(Files.readAllLines(copied.toPath())));
}
@Test @Test
public void givenNIO2_whenCopied_thenCopyExistsWithSameContents() throws IOException { public void givenIoAPI_whenCopied_thenCopyExistsWithSameContents() throws IOException {
Path copied = Paths.get("src/test/resources/copiedWithNio.txt"); File copied = new File("src/test/resources/copiedWithIo.txt");
Path originalPath = original.toPath(); try (InputStream in = new BufferedInputStream(new FileInputStream(original));
copied = FileCopier.copyWithNio(originalPath, copied); OutputStream out = new BufferedOutputStream(new FileOutputStream(copied))) {
assertTrue(Files.exists(copied)); byte[] buffer = new byte[1024];
assertTrue(Files.readAllLines(originalPath) int lengthRead;
.equals(Files.readAllLines(copied))); while ((lengthRead = in.read(buffer)) > 0) {
} out.write(buffer, 0, lengthRead);
out.flush();
}
}
assertThat(copied).exists();
assertThat(Files.readAllLines(original.toPath()).equals(Files.readAllLines(copied.toPath())));
}
@Test
public void givenCommonsIoAPI_whenCopied_thenCopyExistsWithSameContents() throws IOException {
File copied = new File("src/test/resources/copiedWithApacheCommons.txt");
FileUtils.copyFile(original, copied);
assertThat(copied).exists();
assertThat(Files.readAllLines(original.toPath()).equals(Files.readAllLines(copied.toPath())));
}
@Test
public void givenNIO2_whenCopied_thenCopyExistsWithSameContents() throws IOException {
Path copied = Paths.get("src/test/resources/copiedWithNio.txt");
Path originalPath = original.toPath();
Files.copy(originalPath, copied, StandardCopyOption.REPLACE_EXISTING);
assertThat(copied).exists();
assertThat(Files.readAllLines(originalPath).equals(Files.readAllLines(copied)));
}
@Test
public void givenGuava_whenCopied_thenCopyExistsWithSameContents() throws IOException {
File copied = new File("src/test/resources/copiedWithApacheCommons.txt");
com.google.common.io.Files.copy(original, copied);
assertThat(copied).exists();
assertThat(Files.readAllLines(original.toPath()).equals(Files.readAllLines(copied.toPath())));
}
} }