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import java.nio.MappedByteBuffer;
import java.io.OutputStream;
import java.io.InputStream;
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.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import java.util.EnumSet;
import static java.nio.file.LinkOption.NOFOLLOW_LINKS;
public class Main {
public static void deleteCopied(Path path){
try {
Files.deleteIfExists(path);
} catch (IOException ex) {
System.err.println(ex);
}
}
public static void main(String[] args) {
final Path copy_from = Paths.get("C:/rafaelnadal/tournaments/2009/videos/
Rafa Best Shots.mp4");
final Path copy_to = Paths.get("C:/Rafa Best Shots.mp4");
long startTime, elapsedTime;
int bufferSizeKB = 4; //also tested for 16, 32, 64, 128, 256 and 1024
int bufferSize = bufferSizeKB * 1024;
deleteCopied(copy_to);
//FileChannel and non-direct buffer
System.out.println("Using FileChannel and non-direct buffer ...");
try (FileChannel fileChannel_from = (FileChannel.open(copy_from,
EnumSet.of(StandardOpenOption.READ)));
FileChannel fileChannel_to = (FileChannel.open(copy_to,
EnumSet.of(StandardOpenOption.CREATE_NEW, StandardOpenOption.WRITE)))) {
startTime = System.nanoTime();
// Allocate a non-direct ByteBuffer
ByteBuffer bytebuffer = ByteBuffer.allocate(bufferSize);
// Read data from file into ByteBuffer
int bytesCount;
while ((bytesCount = fileChannel_from.read(bytebuffer)) > 0) {
//flip the buffer which set the limit to current position, and position to 0
bytebuffer.flip();
//write data from ByteBuffer to file
fileChannel_to.write(bytebuffer);
//for the next read
bytebuffer.clear();
}
elapsedTime = System.nanoTime() - startTime;
System.out.println("Elapsed Time is " + (elapsedTime / 1000000000.0) + " seconds");
} catch (IOException ex) {
System.err.println(ex);
}
deleteCopied(copy_to);
//FileChannel and direct buffer
System.out.println("Using FileChannel and direct buffer ...");
try (FileChannel fileChannel_from = (FileChannel.open(copy_from,
EnumSet.of(StandardOpenOption.READ)));
FileChannel fileChannel_to = (FileChannel.open(copy_to,
EnumSet.of(StandardOpenOption.CREATE_NEW, StandardOpenOption.WRITE)))) {
startTime = System.nanoTime();
// Allocate a direct ByteBuffer
ByteBuffer bytebuffer = ByteBuffer.allocateDirect(bufferSize);
// Read data from file into ByteBuffer
int bytesCount;
while ((bytesCount = fileChannel_from.read(bytebuffer)) > 0) {
//flip the buffer which set the limit to current position, and position to 0
bytebuffer.flip();
//write data from ByteBuffer to file
fileChannel_to.write(bytebuffer);
//for the next read
bytebuffer.clear();
}
elapsedTime = System.nanoTime() - startTime;
System.out.println("Elapsed Time is " + (elapsedTime / 1000000000.0) + " seconds");
} catch (IOException ex) {
System.err.println(ex);
}
deleteCopied(copy_to);
//FileChannel.transferTo()
System.out.println("Using FileChannel.transferTo method ...");
try (FileChannel fileChannel_from = (FileChannel.open(copy_from,
EnumSet.of(StandardOpenOption.READ)));
FileChannel fileChannel_to = (FileChannel.open(copy_to,
EnumSet.of(StandardOpenOption.CREATE_NEW, StandardOpenOption.WRITE)))) {
startTime = System.nanoTime();
fileChannel_from.transferTo(0L, fileChannel_from.size(), fileChannel_to);
elapsedTime = System.nanoTime() - startTime;
System.out.println("Elapsed Time is " + (elapsedTime / 1000000000.0) + " seconds");
} catch (IOException ex) {
System.err.println(ex);
}
deleteCopied(copy_to);
//FileChannel.transferFrom()
System.out.println("Using FileChannel.transferFrom method ...");
try (FileChannel fileChannel_from = (FileChannel.open(copy_from,
EnumSet.of(StandardOpenOption.READ)));
FileChannel fileChannel_to = (FileChannel.open(copy_to,
EnumSet.of(StandardOpenOption.CREATE_NEW, StandardOpenOption.WRITE)))) {
startTime = System.nanoTime();
fileChannel_to.transferFrom(fileChannel_from, 0L, (int) fileChannel_from.size());
elapsedTime = System.nanoTime() - startTime;
System.out.println("Elapsed Time is " + (elapsedTime / 1000000000.0) + " seconds");
} catch (IOException ex) {
System.err.println(ex);
}
deleteCopied(copy_to);
//FileChannel.map
System.out.println("Using FileChannel.map method ...");
try (FileChannel fileChannel_from = (FileChannel.open(copy_from,
EnumSet.of(StandardOpenOption.READ)));
FileChannel fileChannel_to = (FileChannel.open(copy_to,
EnumSet.of(StandardOpenOption.CREATE_NEW, StandardOpenOption.WRITE)))) {
startTime = System.nanoTime();
MappedByteBuffer buffer = fileChannel_from.map(FileChannel.MapMode.READ_ONLY,
0, fileChannel_from.size());
fileChannel_to.write(buffer);
buffer.clear();
elapsedTime = System.nanoTime() - startTime;
System.out.println("Elapsed Time is " + (elapsedTime / 1000000000.0) + " seconds");
} catch (IOException ex) {
System.err.println(ex);
}
deleteCopied(copy_to);
//Buffered Stream I/O
System.out.println("Using buffered streams and byte array ...");
File inFileStr = copy_from.toFile();
File outFileStr = copy_to.toFile();
try (BufferedInputStream in = new BufferedInputStream(new FileInputStream(inFileStr));
BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(outFileStr))) {
startTime = System.nanoTime();
byte[] byteArray = new byte[bufferSize];
int bytesCount;
while ((bytesCount = in.read(byteArray)) != -1) {
out.write(byteArray, 0, bytesCount);
}
elapsedTime = System.nanoTime() - startTime;
System.out.println("Elapsed Time is " + (elapsedTime / 1000000000.0) + " seconds");
} catch (IOException ex) {
System.err.println(ex);
}
deleteCopied(copy_to);
System.out.println("Using un-buffered streams and byte array ...");
try (FileInputStream in = new FileInputStream(inFileStr);
FileOutputStream out = new FileOutputStream(outFileStr)) {
startTime = System.nanoTime();
byte[] byteArray = new byte[bufferSize];
int bytesCount;
while ((bytesCount = in.read(byteArray)) != -1) {
out.write(byteArray, 0, bytesCount);
}
elapsedTime = System.nanoTime() - startTime;
System.out.println("Elapsed Time is " + (elapsedTime / 1000000000.0) + " seconds");
} catch (IOException ex) {
System.err.println(ex);
}
deleteCopied(copy_to);
System.out.println("Using Files.copy (Path to Path) method ...");
try {
startTime = System.nanoTime();
Files.copy(copy_from, copy_to, NOFOLLOW_LINKS);
elapsedTime = System.nanoTime() - startTime;
System.out.println("Elapsed Time is " + (elapsedTime / 1000000000.0) + " seconds");
} catch (IOException e) {
System.err.println(e);
}
deleteCopied(copy_to);
System.out.println("Using Files.copy (InputStream to Path) ...");
try (InputStream is = new FileInputStream(copy_from.toFile())) {
startTime = System.nanoTime();
Files.copy(is, copy_to);
elapsedTime = System.nanoTime() - startTime;
System.out.println("Elapsed Time is " + (elapsedTime / 1000000000.0) + " seconds");
} catch (IOException e) {
System.err.println(e);
}
deleteCopied(copy_to);
System.out.println("Using Files.copy (Path to OutputStream) ...");
try (OutputStream os = new FileOutputStream(copy_to.toFile())) {
startTime = System.nanoTime();
Files.copy(copy_from, os);
elapsedTime = System.nanoTime() - startTime;
System.out.println("Elapsed Time is " + (elapsedTime / 1000000000.0) + " seconds");
} catch (IOException e) {
System.err.println(e);
}
}
}
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