CODEWITHSUNDEEP
javafiledirectorycopy
user42155
user42155

Reputation: 49665

Copying files from one directory to another in Java

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];

}

Upvotes: 184

Views: 583302

Answers (30)

Carlos Jesus Arancibia Taborga
Carlos Jesus Arancibia Taborga

Reputation: 384

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;
}

Upvotes: 0

Yash
Yash

Reputation: 427

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);
}

Upvotes: 3

Niraj Sonawane
Niraj Sonawane

Reputation: 11055

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);
    }
}

Upvotes: 13

user7548672
user7548672

Reputation:

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();
    }

}

Upvotes: 0

user273132
user273132

Reputation:

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 (e.g. using try-with-resource) acquired by Files.walk call. Thanks to @jannis for the point.

Upvotes: 7

Pankaj
Pankaj

Reputation: 21

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) {
            }
        }
    }

Upvotes: 1

Domenico
Domenico

Reputation: 1491

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();
        }


    }
}

Upvotes: 0

Yogesh Sanchihar
Yogesh Sanchihar

Reputation: 1118

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();
                }
            }
        }
    }
}

Upvotes: 0

Ihor Rybak
Ihor Rybak

Reputation: 3279

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);

Upvotes: 20

saste
saste

Reputation: 720

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);
    }
}

Upvotes: 8

Shaktisinh Jadeja
Shaktisinh Jadeja

Reputation: 1457

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();

Upvotes: 10

Nikunj Gupta
Nikunj Gupta

Reputation: 126

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

Upvotes: 1

Tanmay kumar shaw
Tanmay kumar shaw

Reputation: 219

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();
        }
    }

Upvotes: 0

Rajneesh Mishra
Rajneesh Mishra

Reputation: 248

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();

Upvotes: 1

Guy Ben-Shahar
Guy Ben-Shahar

Reputation: 231

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();
    }
 }
}

Upvotes: 3

Mr. Anderson
Mr. Anderson

Reputation: 19

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.

Upvotes: 0

gagarwa
gagarwa

Reputation: 1492

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

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

Upvotes: 8

Harinath Reddy
Harinath Reddy

Reputation: 1

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");
    }
}

Upvotes: 0

Arun P Johny
Arun P Johny

Reputation: 388316

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.

Upvotes: 194

Stu Thompson
Stu Thompson

Reputation: 38868

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);

Upvotes: 10

Michael Borgwardt
Michael Borgwardt

Reputation: 346250

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

Upvotes: 45

Dhrumil Shah
Dhrumil Shah

Reputation: 746

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) {
    }
}

Upvotes: 0

Nithin
Nithin

Reputation: 1

    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();

Upvotes: 0

Glen Best
Glen Best

Reputation: 23105

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.

Upvotes: 46

mital
mital

Reputation: 21

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();
    }
}

Upvotes: 2

Varun Bhatia
Varun Bhatia

Reputation: 4386

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();
     }
 }

Upvotes: 0

lk.annamalai
lk.annamalai

Reputation: 403

i use the following code to transfer a uploaded CommonMultipartFile to a folder and copy that file to a destination folder in webapps (i.e) 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);

Upvotes: 1

Bhimesh
Bhimesh

Reputation: 27

Use

org.apache.commons.io.FileUtils

It's so handy

Upvotes: 1

Balaswamy Vaddeman
Balaswamy Vaddeman

Reputation: 8530

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)

Upvotes: 20

thamizhannal
thamizhannal

Reputation: 41

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();
            }            
        }
    }

Upvotes: 4

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