Copying files from one directory to another in Java

Question

I want to copy files from one directory to another (subdirectory) using Java. I have a directory, dir, with text files. I iterate over the first 20 files in dir, and want to copy them to another directory in the dir directory, which I have created right before the iteration. In the code, I want to copy the review (which represents the ith text file or review) to trainingDir . How can I do this? There seems not to be such a function (or I couldn't find). Thank you.

boolean success = false;
File[] reviews = dir.listFiles();
String trainingDir = dir.getAbsolutePath() + "/trainingData";
File trDir = new File(trainingDir);
success = trDir.mkdir();
for(int i = 1; i <= 20; i++) {
    File review = reviews[i];

}

Answer 1

For now this should solve your problem

File source = new File("H:\\work-temp\\file");
File dest = new File("H:\\work-temp\\file2");
try {
    FileUtils.copyDirectory(source, dest);
} catch (IOException e) {
    e.printStackTrace();
}

FileUtils class from apache commons-io library, available since version 1.2.

Using third party tools instead of writing all utilities by ourself seems to be a better idea. It can save time and other valuable resources.

Answer 2

There is no file copy method in the Standard API (yet). Your options are:

• Write it yourself, using a FileInputStream, a FileOutputStream and a buffer to copy bytes from one to the other - or better yet, use FileChannel.transferTo()
• User Apache Commons' FileUtils
• Wait for NIO2 in Java 7

Answer 3

In Java 7, there is a standard method to copy files in java:

Files.copy.

It integrates with O/S native I/O for high performance.

See my A on Standard concise way to copy a file in Java? for a full description of usage.

Answer 4

The example below from Java Tips is rather straight forward. I have since switched to Groovy for operations dealing with the file system - much easier and elegant. But here is the Java Tips one I used in the past. It lacks the robust exception handling that is required to make it fool-proof.

 public void copyDirectory(File sourceLocation , File targetLocation)
    throws IOException {

        if (sourceLocation.isDirectory()) {
            if (!targetLocation.exists()) {
                targetLocation.mkdir();
            }

            String[] children = sourceLocation.list();
            for (int i=0; i<children.length; i++) {
                copyDirectory(new File(sourceLocation, children[i]),
                        new File(targetLocation, children[i]));
            }
        } else {

            InputStream in = new FileInputStream(sourceLocation);
            OutputStream out = new FileOutputStream(targetLocation);

            // Copy the bits from instream to outstream
            byte[] buf = new byte[1024];
            int len;
            while ((len = in.read(buf)) > 0) {
                out.write(buf, 0, len);
            }
            in.close();
            out.close();
        }
    }

Answer 5

If you want to copy a file and not move it you can code like this.

private static void copyFile(File sourceFile, File destFile)
        throws IOException {
    if (!sourceFile.exists()) {
        return;
    }
    if (!destFile.exists()) {
        destFile.createNewFile();
    }
    FileChannel source = null;
    FileChannel destination = null;
    source = new FileInputStream(sourceFile).getChannel();
    destination = new FileOutputStream(destFile).getChannel();
    if (destination != null && source != null) {
        destination.transferFrom(source, 0, source.size());
    }
    if (source != null) {
        source.close();
    }
    if (destination != null) {
        destination.close();
    }

}

Answer 6

apache commons Fileutils is handy. you can do below activities.

1. copying file from one directory to another directory.

   use copyFileToDirectory(File srcFile, File destDir)

2. copying directory from one directory to another directory.

   use copyDirectory(File srcDir, File destDir)

3. copying contents of one file to another

   use static void copyFile(File srcFile, File destFile)

Answer 7

Spring Framework has many similar util classes like Apache Commons Lang. So there is org.springframework.util.FileSystemUtils

File src = new File("/home/user/src");
File dest = new File("/home/user/dest");
FileSystemUtils.copyRecursively(src, dest);

Answer 8

You seem to be looking for the simple solution (a good thing). I recommend using Apache Common's FileUtils.copyDirectory :

Copies a whole directory to a new location preserving the file dates.

This method copies the specified directory and all its child directories and files to the specified destination. The destination is the new location and name of the directory.

The destination directory is created if it does not exist. If the destination directory did exist, then this method merges the source with the destination, with the source taking precedence.

Your code could like nice and simple like this:

File trgDir = new File("/tmp/myTarget/");
File srcDir = new File("/tmp/mySource/");

FileUtils.copyDirectory(srcDir, trgDir);

Answer 9

File sourceFile = new File("C:\\Users\\Demo\\Downloads\\employee\\"+img);
File destinationFile = new File("\\images\\" + sourceFile.getName());

FileInputStream fileInputStream = new FileInputStream(sourceFile);
FileOutputStream fileOutputStream = new FileOutputStream(
                destinationFile);

int bufferSize;
byte[] bufffer = new byte[512];
while ((bufferSize = fileInputStream.read(bufffer)) > 0) {
    fileOutputStream.write(bufffer, 0, bufferSize);
}
fileInputStream.close();
fileOutputStream.close();

Answer 10

Java 8

Path sourcepath = Paths.get("C:\\data\\temp\\mydir");
Path destinationepath = Paths.get("C:\\data\\temp\\destinationDir");        
Files.walk(sourcepath)
         .forEach(source -> copy(source, destinationepath.resolve(sourcepath.relativize(source)))); 

Copy Method

static void copy(Path source, Path dest) {
    try {
        Files.copy(source, dest, StandardCopyOption.REPLACE_EXISTING);
    } catch (Exception e) {
        throw new RuntimeException(e.getMessage(), e);
    }
}

Answer 11

import static java.nio.file.StandardCopyOption.*;
...
Files.copy(source, target, REPLACE_EXISTING);

Source: https://docs.oracle.com/javase/tutorial/essential/io/copy.html

Answer 12

Apache commons FileUtils will be handy, if you want only to move files from the source to target directory rather than copy the whole directory, you can do:

for (File srcFile: srcDir.listFiles()) {
    if (srcFile.isDirectory()) {
        FileUtils.copyDirectoryToDirectory(srcFile, dstDir);
    } else {
        FileUtils.copyFileToDirectory(srcFile, dstDir);
    }
}

If you want to skip directories, you can do:

for (File srcFile: srcDir.listFiles()) {
    if (!srcFile.isDirectory()) {
        FileUtils.copyFileToDirectory(srcFile, dstDir);
    }
}

Answer 13

Inspired by Mohit's answer in this thread . Applicable only for Java 8.

The following can be used to copy everything recursively from one folder to another:

public static void main(String[] args) throws IOException {
    Path source = Paths.get("/path/to/source/dir");
    Path destination = Paths.get("/path/to/dest/dir");

    List<Path> sources = Files.walk(source).collect(toList());
    List<Path> destinations = sources.stream()
            .map(source::relativize)
            .map(destination::resolve)
            .collect(toList());

    for (int i = 0; i < sources.size(); i++) {
        Files.copy(sources.get(i), destinations.get(i));
    }
}

Stream-style FTW.

Upd 2019-06-10: important note - close the stream (eg using try-with-resource) acquired by Files.walk call. Thanks to @jannis for the point.

Answer 14

Below is Brian's modified code which copies files from source location to destination location.

public class CopyFiles {
 public static void copyFiles(File sourceLocation , File targetLocation)
    throws IOException {

        if (sourceLocation.isDirectory()) {
            if (!targetLocation.exists()) {
                targetLocation.mkdir();
            }
            File[] files = sourceLocation.listFiles();
            for(File file:files){
                InputStream in = new FileInputStream(file);
                OutputStream out = new FileOutputStream(targetLocation+"/"+file.getName());

                // Copy the bits from input stream to output stream
                byte[] buf = new byte[1024];
                int len;
                while ((len = in.read(buf)) > 0) {
                    out.write(buf, 0, len);
                }
                in.close();
                out.close();
            }            
        }
    }

Answer 15

You can workaround with copy the source file to a new file and delete the original.

public class MoveFileExample {

 public static void main(String[] args) {   

    InputStream inStream = null;
    OutputStream outStream = null;

    try {

        File afile = new File("C:\\folderA\\Afile.txt");
        File bfile = new File("C:\\folderB\\Afile.txt");

        inStream = new FileInputStream(afile);
        outStream = new FileOutputStream(bfile);

        byte[] buffer = new byte[1024];

        int length;
        //copy the file content in bytes 
        while ((length = inStream.read(buffer)) > 0) {
            outStream.write(buffer, 0, length);
        }

        inStream.close();
        outStream.close();

        //delete the original file
        afile.delete();

        System.out.println("File is copied successful!");

    } catch(IOException e) {
        e.printStackTrace();
    }
 }
}

Answer 16

This prevents file from being corrupted !

Just download the following jar!
Jar File
Download Page

import org.springframework.util.FileCopyUtils;

private static void copyFile(File source, File dest) throws IOException {
    //This is safe and don't corrupt files as FileOutputStream does
    File src = source;
    File destination = dest;
    FileCopyUtils.copy(src, dest);
}

Answer 17

File dir = new File("D:\\mital\\filestore");
File[] files = dir.listFiles(new File_Filter("*"+ strLine + "*.txt"));
for (File file : files){    
    System.out.println(file.getName());

    try {
        String sourceFile=dir+"\\"+file.getName();
        String destinationFile="D:\\mital\\storefile\\"+file.getName();
        FileInputStream fileInputStream = new FileInputStream(sourceFile);
        FileOutputStream fileOutputStream = new FileOutputStream(
                        destinationFile);
        int bufferSize;
        byte[] bufffer = new byte[512];
        while ((bufferSize = fileInputStream.read(bufffer)) > 0) {
            fileOutputStream.write(bufffer, 0, bufferSize);
        }
        fileInputStream.close();
        fileOutputStream.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

Answer 18

The NIO classes make this pretty simple.

http://www.javalobby.org/java/forums/t17036.html

Answer 19

i use the following code to transfer a uploaded CommonMultipartFile to a folder and copy that file to a destination folder in webapps (ie) web project folder,

    String resourcepath = "C:/resources/images/" + commonsMultipartFile.getOriginalFilename();

    File file = new File(resourcepath);
    commonsMultipartFile.transferTo(file);

    //Copy File to a Destination folder
    File destinationDir = new File("C:/Tomcat/webapps/myProject/resources/images/");
    FileUtils.copyFileToDirectory(file, destinationDir);

Answer 20

Copy file from one directory to another directory...

FileChannel source=new FileInputStream(new File("source file path")).getChannel();
FileChannel desti=new FileOutputStream(new File("destination file path")).getChannel();
desti.transferFrom(source, 0, source.size());
source.close();
desti.close();

Answer 21

here is simply a java code to copy data from one folder to another, you have to just give the input of the source and destination.

import java.io.*;

public class CopyData {
static String source;
static String des;

static void dr(File fl,boolean first) throws IOException
{
    if(fl.isDirectory())
    {
        createDir(fl.getPath(),first);
        File flist[]=fl.listFiles();
        for(int i=0;i<flist.length;i++)
        {

            if(flist[i].isDirectory())
            {
                dr(flist[i],false);
            }

            else
            {

                copyData(flist[i].getPath());
            }
        }
    }

    else
    {
        copyData(fl.getPath());
    }
}

private static void copyData(String name) throws IOException {

        int i;
        String str=des;
        for(i=source.length();i<name.length();i++)
        {
            str=str+name.charAt(i);
        }
        System.out.println(str);
        FileInputStream fis=new FileInputStream(name);
        FileOutputStream fos=new FileOutputStream(str);
        byte[] buffer = new byte[1024];
        int noOfBytes = 0;
         while ((noOfBytes = fis.read(buffer)) != -1) {
             fos.write(buffer, 0, noOfBytes);
         }


}

private static void createDir(String name, boolean first) {

    int i;

    if(first==true)
    {
        for(i=name.length()-1;i>0;i--)
        {
            if(name.charAt(i)==92)
            {
                break;
            }
        }

        for(;i<name.length();i++)
        {
            des=des+name.charAt(i);
        }
    }
    else
    {
        String str=des;
        for(i=source.length();i<name.length();i++)
        {
            str=str+name.charAt(i);
        }
        (new File(str)).mkdirs();
    }

}

public static void main(String args[]) throws IOException
{
    BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
    System.out.println("program to copy data from source to destination \n");
    System.out.print("enter source path : ");
    source=br.readLine();
    System.out.print("enter destination path : ");
    des=br.readLine();
    long startTime = System.currentTimeMillis();
    dr(new File(source),true);
    long endTime   = System.currentTimeMillis();
    long time=endTime-startTime;
    System.out.println("\n\n Time taken = "+time+" mili sec");
}

}

this a working code for what you want..let me know if it helped

Answer 22

Use

org.apache.commons.io.FileUtils

It's so handy

Answer 23

Best way as per my knowledge is as follows:

    public static void main(String[] args) {

    String sourceFolder = "E:\\Source";
    String targetFolder = "E:\\Target";
    File sFile = new File(sourceFolder);
    File[] sourceFiles = sFile.listFiles();
    for (File fSource : sourceFiles) {
        File fTarget = new File(new File(targetFolder), fSource.getName());
        copyFileUsingStream(fSource, fTarget);
        deleteFiles(fSource);
    }
}

    private static void deleteFiles(File fSource) {
        if(fSource.exists()) {
            try {
                FileUtils.forceDelete(fSource);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    private static void copyFileUsingStream(File source, File dest) {
        InputStream is = null;
        OutputStream os = null;
        try {
            is = new FileInputStream(source);
            os = new FileOutputStream(dest);
            byte[] buffer = new byte[1024];
            int length;
            while ((length = is.read(buffer)) > 0) {
                os.write(buffer, 0, length);
            }
        } catch (Exception ex) {
            System.out.println("Unable to copy file:" + ex.getMessage());
        } finally {
            try {
                is.close();
                os.close();
            } catch (Exception ex) {
            }
        }
    }

Answer 24

You can use the following code to copy files from one directory to another

// parent folders of dest must exist before calling this function
public static void copyTo( File src, File dest ) throws IOException {
     // recursively copy all the files of src folder if src is a directory
     if( src.isDirectory() ) {
         // creating parent folders where source files is to be copied
         dest.mkdirs();
         for( File sourceChild : src.listFiles() ) {
             File destChild = new File( dest, sourceChild.getName() );
             copyTo( sourceChild, destChild );
         }
     } 
     // copy the source file
     else {
         InputStream in = new FileInputStream( src );
         OutputStream out = new FileOutputStream( dest );
         writeThrough( in, out );
         in.close();
         out.close();
     }
 }

Answer 25

    File file = fileChooser.getSelectedFile();
    String selected = fc.getSelectedFile().getAbsolutePath();
     File srcDir = new File(selected);
     FileInputStream fii;
     FileOutputStream fio;
    try {
         fii = new FileInputStream(srcDir);
         fio = new FileOutputStream("C:\\LOvE.txt");
         byte [] b=new byte[1024];
         int i=0;
        try {
            while ((fii.read(b)) > 0)
            {

              System.out.println(b);
              fio.write(b);
            }
            fii.close();
            fio.close();

Answer 26

following code to copy files from one directory to another

File destFile = new File(targetDir.getAbsolutePath() + File.separator
    + file.getName());
try {
  showMessage("Copying " + file.getName());
  in = new BufferedInputStream(new FileInputStream(file));
  out = new BufferedOutputStream(new FileOutputStream(destFile));
  int n;
  while ((n = in.read()) != -1) {
    out.write(n);
  }
  showMessage("Copied " + file.getName());
} catch (Exception e) {
  showMessage("Cannot copy file " + file.getAbsolutePath());
} finally {
  if (in != null)
    try {
      in.close();
    } catch (Exception e) {
    }
  if (out != null)
    try {
      out.close();
    } catch (Exception e) {
    }
}

Answer 27

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class CopyFiles {
    private File targetFolder;
    private int noOfFiles;
    public void copyDirectory(File sourceLocation, String destLocation)
            throws IOException {
        targetFolder = new File(destLocation);
        if (sourceLocation.isDirectory()) {
            if (!targetFolder.exists()) {
                targetFolder.mkdir();
            }

            String[] children = sourceLocation.list();
            for (int i = 0; i < children.length; i++) {
                copyDirectory(new File(sourceLocation, children[i]),
                        destLocation);

            }
        } else {

            InputStream in = new FileInputStream(sourceLocation);
            OutputStream out = new FileOutputStream(targetFolder + "\\"+ sourceLocation.getName(), true);
            System.out.println("Destination Path ::"+targetFolder + "\\"+ sourceLocation.getName());            
            // Copy the bits from instream to outstream
            byte[] buf = new byte[1024];
            int len;
            while ((len = in.read(buf)) > 0) {
                out.write(buf, 0, len);
            }
            in.close();
            out.close();
            noOfFiles++;
        }
    }

    public static void main(String[] args) throws IOException {

        File srcFolder = new File("C:\\sourceLocation\\");
        String destFolder = new String("C:\\targetLocation\\");
        CopyFiles cf = new CopyFiles();
        cf.copyDirectory(srcFolder, destFolder);
        System.out.println("No Of Files got Retrieved from Source ::"+cf.noOfFiles);
        System.out.println("Successfully Retrieved");
    }
}

Answer 28

Not even that complicated and no imports required in Java 7:

The renameTo( ) method changes the name of a file:

public boolean renameTo( File destination)

For example, to change the name of the file src.txt in the current working directory to dst.txt , you would write:

File src = new File(" src.txt"); File dst = new File(" dst.txt"); src.renameTo( dst); 

That's it.

Reference:

Harold, Elliotte Rusty (2006-05-16). Java I/O (p. 393). O'Reilly Media. Kindle Edition.

Answer 29

You can use the following code to copy files from one directory to another

public static void copyFile(File sourceFile, File destFile) throws IOException {
        InputStream in = null;
        OutputStream out = null;
        try {
            in = new FileInputStream(sourceFile);
            out = new FileOutputStream(destFile);
            byte[] buffer = new byte[1024];
            int length;
            while ((length = in.read(buffer)) > 0) {
                out.write(buffer, 0, length);
            }
        } catch(Exception e){
            e.printStackTrace();
        }
        finally {
            in.close();
            out.close();
        }
    }

Answer 30

Following recursive function I have written, if it helps anyone. It will copy all the files inside sourcedirectory to destinationDirectory.

example:

rfunction("D:/MyDirectory", "D:/MyDirectoryNew", "D:/MyDirectory");

public static void rfunction(String sourcePath, String destinationPath, String currentPath) {
    File file = new File(currentPath);
    FileInputStream fi = null;
    FileOutputStream fo = null;

    if (file.isDirectory()) {
        String[] fileFolderNamesArray = file.list();
        File folderDes = new File(destinationPath);
        if (!folderDes.exists()) {
            folderDes.mkdirs();
        }

        for (String fileFolderName : fileFolderNamesArray) {
            rfunction(sourcePath, destinationPath + "/" + fileFolderName, currentPath + "/" + fileFolderName);
        }
    } else {
        try {
            File destinationFile = new File(destinationPath);

            fi = new FileInputStream(file);
            fo = new FileOutputStream(destinationPath);
            byte[] buffer = new byte[1024];
            int ind = 0;
            while ((ind = fi.read(buffer))>0) {
                fo.write(buffer, 0, ind);
            }
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        finally {
            if (null != fi) {
                try {
                    fi.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            if (null != fo) {
                try {
                    fo.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
    }
}

Answer 31

If you don't want to use external libraries and you want to use the java.io instead of java.nio classes, you can use this concise method to copy a folder and all its content:

/**
 * Copies a folder and all its content to another folder. Do not include file separator at the end path of the folder destination.
 * @param folderToCopy The folder and it's content that will be copied
 * @param folderDestination The folder destination
 */
public static void copyFolder(File folderToCopy, File folderDestination) {
    if(!folderDestination.isDirectory() || !folderToCopy.isDirectory())
        throw new IllegalArgumentException("The folderToCopy and folderDestination must be directories");

    folderDestination.mkdirs();

    for(File fileToCopy : folderToCopy.listFiles()) {
        File copiedFile = new File(folderDestination + File.separator + fileToCopy.getName());

        try (FileInputStream fis = new FileInputStream(fileToCopy);
             FileOutputStream fos = new FileOutputStream(copiedFile)) {

            int read;
            byte[] buffer = new byte[512];

            while ((read = fis.read(buffer)) != -1) {
                fos.write(buffer, 0, read);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }


    }
}

Answer 32

I provided an alternate solution without the need to use a third party, such as apache FileUtils. This can be done through the command line.

I tested this out on Windows and it works for me. A Linux solution follows.

Here I am utilizing Windows xcopy command to copy all files including subdirectories. The parameters that I pass are defined as per below.

• /e - Copies all subdirectories, even if they are empty.
• /i - If Source is a directory or contains wildcards and Destination does not exist, xcopy assumes Destination specifies a directory name and creates a new directory. Then, xcopy copies all specified files into the new directory.
• /h - Copies files with hidden and system file attributes. By default, xcopy does not copy hidden or system files

My example(s) utilizes the ProcessBuilder class to construct a process to execute the copy(xcopy & cp) commands.

Windows:

String src = "C:\\srcDir";
String dest = "C:\\destDir";
List<String> cmd = Arrays.asList("xcopy", src, dest, "/e", "/i", "/h");
try {
    Process proc = new ProcessBuilder(cmd).start();
    BufferedReader inp = new BufferedReader(new InputStreamReader(proc.getInputStream()));
    String line = null;
    while ((line = inp.readLine()) != null) {
        System.out.println(line);
    }
} catch (IOException e) {
    e.printStackTrace();
}

Linux:

String src = "srcDir/";
String dest = "~/destDir/";
List<String> cmd = Arrays.asList("/bin/bash", "-c", "cp", "r", src, dest);
try {
    Process proc = new ProcessBuilder(cmd).start();
    BufferedReader inp = new BufferedReader(new InputStreamReader(proc.getInputStream()));
    String line = null;
    while ((line = inp.readLine()) != null) {
        System.out.println(line);
    }
} catch (IOException e) {
    e.printStackTrace();
}

---

Or a combo that can work on both Windows or Linux environments.

private static final String OS = System.getProperty("os.name");
private static String src = null;
private static String dest = null;
private static List<String> cmd = null;

public static void main(String[] args) {
    if (OS.toLowerCase().contains("windows")) { // setup WINDOWS environment
        src = "C:\\srcDir";
        dest = "C:\\destDir";
        cmd = Arrays.asList("xcopy", src, dest, "/e", "/i", "/h");

        System.out.println("on: " + OS);
    } else if (OS.toLowerCase().contains("linux")){ // setup LINUX environment
        src = "srcDir/";
        dest = "~/destDir/";
        cmd = Arrays.asList("/bin/bash", "-c", "cp", "r", src, dest);

        System.out.println("on: " + OS);
    }

    try {
        Process proc = new ProcessBuilder(cmd).start();
        BufferedReader inp = new BufferedReader(new InputStreamReader(proc.getInputStream()));
        String line = null;
        while ((line = inp.readLine()) != null) {
            System.out.println(line);
        }
    } catch (IOException e) {
        e.printStackTrace();
    }

}

Answer 33

For JRE6/Java 6 or higher if do you need sync two folders, do you can use this code "syncFolder", you can remove the ProgressMonitor parameter.

The method returns a recursive string description of errors, it returns empty if there are no problems.

public static String syncFolder(File folderFrom, File folderTo, ProgressMonitor monitor) {
    String res = "";
    File[] fromFiles = folderFrom.listFiles();
    float actualPercent = 0;
    float iterationPercent = 100f / fromFiles.length;
    monitor.setProgress(0);
    for (File remoteFile : fromFiles) {
        monitor.setNote("Sincronizando " + remoteFile.getName());
        String mirrorFilePath = folderTo.getAbsolutePath() + "\\" + remoteFile.getName();
        if (remoteFile.isDirectory()) {
            File mirrorFolder = new File(mirrorFilePath);
            if (!mirrorFolder.exists() && !mirrorFolder.mkdir()) {
                res = res + "No se pudo crear el directorio " + mirrorFolder.getAbsolutePath() + "\n";
            }
            res = res + syncFolder(remoteFile, mirrorFolder, monitor);
        } else {
            boolean copyReplace = true;
            File mirrorFile = new File(mirrorFilePath);
            if (mirrorFile.exists()) {
                boolean eq = HotUtils.sameFile(remoteFile, mirrorFile);
                if (!eq) {
                    res = res + "Sincronizado: " + mirrorFile.getAbsolutePath() + " - " + remoteFile.getAbsolutePath() + "\n";
                    if (!mirrorFile.delete()) {
                        res = res + "Error - El archivo no pudo ser eliminado\n";
                    }
                } else {
                    copyReplace = false;
                }
            }
            if (copyReplace) {
                copyFile(remoteFile, mirrorFile);
            }
            actualPercent = actualPercent + iterationPercent;
            int resPercent = (int) actualPercent;
            if (resPercent != 100) {
                monitor.setProgress(resPercent);
            }
        }
    }
    return res;
}
    
    public static boolean sameFile(File a, File b) {
    if (a == null || b == null) {
        return false;
    }

    if (a.getAbsolutePath().equals(b.getAbsolutePath())) {
        return true;
    }

    if (!a.exists() || !b.exists()) {
        return false;
    }
    if (a.length() != b.length()) {
        return false;
    }
    boolean eq = true;

    FileChannel channelA = null;
    FileChannel channelB = null;
    try {
        channelA = new RandomAccessFile(a, "r").getChannel();
        channelB = new RandomAccessFile(b, "r").getChannel();

        long channelsSize = channelA.size();
        ByteBuffer buff1 = channelA.map(FileChannel.MapMode.READ_ONLY, 0, channelsSize);
        ByteBuffer buff2 = channelB.map(FileChannel.MapMode.READ_ONLY, 0, channelsSize);
        for (int i = 0; i < channelsSize; i++) {
            if (buff1.get(i) != buff2.get(i)) {
                eq = false;
                break;
            }
        }
    } catch (FileNotFoundException ex) {
        Logger.getLogger(HotUtils.class.getName()).log(Level.SEVERE, null, ex);
    } catch (IOException ex) {
        Logger.getLogger(HotUtils.class.getName()).log(Level.SEVERE, null, ex);
    } finally {
        try {
            if (channelA != null) {
                channelA.close();
            }
            if (channelB != null) {
                channelB.close();
            }
        } catch (IOException ex) {
            Logger.getLogger(HotUtils.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
    return eq;
}

public static boolean copyFile(File from, File to) {
    boolean res = false;
    try {
        final FileInputStream inputStream = new FileInputStream(from);
        final FileOutputStream outputStream = new FileOutputStream(to);
        final FileChannel inChannel = inputStream.getChannel();
        final FileChannel outChannel = outputStream.getChannel();
        inChannel.transferTo(0, inChannel.size(), outChannel);
        inChannel.close();
        outChannel.close();
        inputStream.close();
        outputStream.close();
        res = true;
    } catch (FileNotFoundException ex) {
        Logger.getLogger(SyncTask.class.getName()).log(Level.SEVERE, null, ex);
    } catch (IOException ex) {
        Logger.getLogger(SyncTask.class.getName()).log(Level.SEVERE, null, ex);
    }
    return res;
}

Answer 34

you use renameTo() – not obvious, I know... but it's the Java equivalent of move...