Description
Copy file or directory to the specified destination.
License
Open Source License
Parameter
| Parameter | Description |
|---|
| source | copy source |
| target | copy destination |
| filter | copy filter |
Exception
Declaration
public static void nioCopy(File source, File target, FilenameFilter filter) throws IOException
Method Source Code
//package com.java2s;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
import java.io.IOException;
import java.nio.channels.FileChannel;
import java.util.LinkedList;
public class Main {
/** Represents filter what select any file */
public static final FilenameFilter ANY_FILTER = new FilenameFilter() {
@Override/*from w ww . j a va 2 s . co m*/
public boolean accept(File dir, String name) {
return true;
}
};
/**
* Copy file or directory to the specified destination. Existed files in destination directory will be overwritten.
* <p/>
* This method use java.nio for coping files.
*
* @param source
* copy source
* @param target
* copy destination
* @param filter
* copy filter
* @throws java.io.IOException
* if any i/o error occurs
*/
public static void nioCopy(File source, File target, FilenameFilter filter) throws IOException {
copy(source, target, filter, true, true);
}
/**
* Copy file or directory to the specified destination.
* <p/>
* This method use java.nio for coping files.
*
* @param source
* copy source
* @param target
* copy destination
* @param filter
* copy filter
* @param replaceIfExists
* if <code>true</code> existed files in destination directory will be overwritten
* @throws java.io.IOException
* if any i/o error occurs
*/
public static void nioCopy(File source, File target, FilenameFilter filter, boolean replaceIfExists)
throws IOException {
copy(source, target, filter, true, replaceIfExists);
}
/**
* Copy file or directory to the specified destination. Existed files in destination directory will be overwritten.
*
* @param source
* copy source
* @param target
* copy destination
* @param filter
* copy filter
* @throws java.io.IOException
* if any i/o error occurs
*/
public static void copy(File source, File target, FilenameFilter filter) throws IOException {
copy(source, target, filter, false, true);
}
/**
* Copy file or directory to the specified destination.
*
* @param source
* copy source
* @param target
* copy destination
* @param filter
* copy filter
* @param replaceIfExists
* if <code>true</code> existed files in destination directory will be overwritten
* @throws java.io.IOException
* if any i/o error occurs
*/
public static void copy(File source, File target, FilenameFilter filter, boolean replaceIfExists)
throws IOException {
copy(source, target, filter, false, replaceIfExists);
}
private static void copy(File source, File target, FilenameFilter filter, boolean nio, boolean replaceIfExists)
throws IOException {
if (source.isDirectory()) {
if (!(target.exists() || target.mkdirs())) {
throw new IOException(String.format("Unable create directory '%s'. ", target.getAbsolutePath()));
}
if (filter == null) {
filter = ANY_FILTER;
}
String sourceRoot = source.getAbsolutePath();
LinkedList<File> q = new LinkedList<>();
q.add(source);
while (!q.isEmpty()) {
File current = q.pop();
File[] list = current.listFiles();
if (list != null) {
for (File f : list) {
if (!filter.accept(current, f.getName())) {
continue;
}
File newFile = new File(target, f.getAbsolutePath().substring(sourceRoot.length() + 1));
if (f.isDirectory()) {
if (!(newFile.exists() || newFile.mkdirs())) {
throw new IOException(
String.format("Unable create directory '%s'. ", newFile.getAbsolutePath()));
}
if (!f.equals(target)) {
q.push(f);
}
} else {
if (nio) {
nioCopyFile(f, newFile, replaceIfExists);
} else {
copyFile(f, newFile, replaceIfExists);
}
}
}
}
}
} else {
File parent = target.getParentFile();
if (!(parent.exists() || parent.mkdirs())) {
throw new IOException(String.format("Unable create directory '%s'. ", parent.getAbsolutePath()));
}
if (nio) {
nioCopyFile(source, target, replaceIfExists);
} else {
copyFile(source, target, replaceIfExists);
}
}
}
private static void nioCopyFile(File source, File target, boolean replaceIfExists) throws IOException {
if (!target.createNewFile()) // atomic
{
if (target.exists() && !replaceIfExists) {
throw new IOException(String.format("File '%s' already exists. ", target.getAbsolutePath()));
}
}
FileInputStream sourceStream = null;
FileOutputStream targetStream = null;
FileChannel sourceChannel = null;
FileChannel targetChannel = null;
try {
sourceStream = new FileInputStream(source);
targetStream = new FileOutputStream(target);
sourceChannel = sourceStream.getChannel();
targetChannel = targetStream.getChannel();
final long size = sourceChannel.size();
long transferred = 0L;
while (transferred < size) {
transferred += targetChannel.transferFrom(sourceChannel, transferred, (size - transferred));
}
} finally {
if (sourceChannel != null) {
sourceChannel.close();
}
if (targetChannel != null) {
targetChannel.close();
}
if (sourceStream != null) {
sourceStream.close();
}
if (targetStream != null) {
targetStream.close();
}
}
}
private static void copyFile(File source, File target, boolean replaceIfExists) throws IOException {
if (!target.createNewFile()) {
if (target.exists() && !replaceIfExists) {
throw new IOException(String.format("File '%s' already exists. ", target.getAbsolutePath()));
}
}
FileInputStream in = null;
FileOutputStream out = null;
byte[] b = new byte[8192];
try {
in = new FileInputStream(source);
out = new FileOutputStream(target);
int r;
while ((r = in.read(b)) != -1) {
out.write(b, 0, r);
}
} finally {
if (in != null) {
in.close();
}
if (out != null) {
out.close();
}
}
}
}
Related
- doCopyFile(File srcFile, File destFile, boolean preserveFileDate)
- fCopy(FileInputStream src, File dest)
- fileChannelCopy(File src, File dest)
- fileCopy(String sourceFolder, String destinationFolder)
- fileStreamCopy(FileInputStream in, FileOutputStream out, boolean closeOutput)
- nioCopy(FileOutputStream fos, FileInputStream fis)
- nioCopyFile(File source, File target, boolean replaceIfExists)
- touchcopy(File src, File dest)
- tryCopyFile(File sourceLocation, File targetLocation)