Copy entire directory contents to another directory

Question

Method to copy entire directory contents to another directory in java or groovy

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With Groovy  you can leverage Ant to do   new AntBuilder   copy  todir   path to destination folder        fileset  dir   path to src folder        AntBuilder is part of the distribution and the automatic imports list which means it is directly available for any groovy code

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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    To do so  here s the example code  String source    C  your source   File srcDir   new File source    String destination    C  your destination   File destDir   new File destination    try       FileUtils copyDirectory srcDir  destDir     catch  IOException e        e printStackTrace

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With regard to Java  there is no such method in the standard API  In Java 7  the java nio file Files class will provide a copy convenience method   References   The Java Tutorials Copying files from one directory to another in Java

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Use Apache s FileUtils copyDirectory  Write your own e g  this guy provides example code  Java 7  take a look at java nio file Files

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The following is an example of using JDK7   public class CopyFileVisitor extends SimpleFileVisitor lt Path gt        private final Path targetPath      private Path sourcePath   null      public CopyFileVisitor Path targetPath            this targetPath   targetPath              Override     public FileVisitResult preVisitDirectory final Path dir      final BasicFileAttributes attrs  throws IOException           if  sourcePath    null                sourcePath   dir            else           Files createDirectories targetPath resolve sourcePath                      relativize dir                       return FileVisitResult CONTINUE              Override     public FileVisitResult visitFile final Path file      final BasicFileAttributes attrs  throws IOException       Files copy file          targetPath resolve sourcePath relativize file         return FileVisitResult CONTINUE            To use the visitor do the following  Files walkFileTree sourcePath  new CopyFileVisitor targetPath      If you d rather just inline everything  not too efficient if you use it often  but good for quickies       final Path targetPath      target     final Path sourcePath      source     Files walkFileTree sourcePath  new SimpleFileVisitor lt Path gt               Override         public FileVisitResult preVisitDirectory final Path dir                  final BasicFileAttributes attrs  throws IOException               Files createDirectories targetPath resolve sourcePath                      relativize dir                 return FileVisitResult CONTINUE                      Override         public FileVisitResult visitFile final Path file                  final BasicFileAttributes attrs  throws IOException               Files copy file                      targetPath resolve sourcePath relativize file                 return FileVisitResult CONTINUE

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With coming in of Java NIO  below is a possible solution too  With Java 9   private static void copyDir String src  String dest  boolean overwrite        try           Files walk Paths get src   forEach a - gt                Path b   Paths get dest  a toString   substring src length                  try                   if   a toString   equals src                       Files copy a  b  overwrite   new CopyOption   StandardCopyOption REPLACE EXISTING    new CopyOption                     catch  IOException e                    e printStackTrace                                    catch  IOException e              permission issue         e printStackTrace              With Java 7   import java io IOException  import java nio file FileAlreadyExistsException  import java nio file Files  import java nio file Path  import java nio file Paths  import java util function Consumer  import java util stream Stream   public class Test        public static void main String   args            Path sourceParentFolder   Paths get   sourceParent            Path destinationParentFolder   Paths get   destination              try               Stream lt Path gt  allFilesPathStream   Files walk sourceParentFolder               Consumer lt   super Path gt  action   new Consumer lt Path gt                       Override                 public void accept Path t                        try                           String destinationPath   t toString   replaceAll sourceParentFolder toString    destinationParentFolder toString                             Files copy t  Paths get destinationPath                                               catch FileAlreadyExistsException e                             TODO do acc to business needs                                           catch  IOException e                               TODO Auto-generated catch block                         e printStackTrace                                                                         allFilesPathStream forEach action               catch FileAlreadyExistsException e                  file already exists and unable to copy           catch  IOException e                  permission issue             e printStackTrace

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If you re open to using a 3rd party library  check out javaxt-core  The javaxt io Directory class can be used to copy directories like this   javaxt io Directory input   new javaxt io Directory   source    javaxt io Directory output   new javaxt io Directory   destination    input copyTo output  true     true to overwrite any existing files   You can also provide a file filter to specify which files you want to copy  There are more examples here   http   javaxt com javaxt-core io Directory Directory Copy

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public static void copyFolder File source  File destination        if  source isDirectory                  if   destination exists                          destination mkdirs                       String files     source list             for  String file   files                        File srcFile   new File source  file               File destFile   new File destination  file                copyFolder srcFile  destFile                       else               InputStream in   null          OutputStream out   null           try                       in   new FileInputStream source               out   new FileOutputStream destination                byte   buffer   new byte 1024                int length              while   length   in read buffer    gt  0                                out write buffer  0  length                                   catch  Exception e                        try                               in close                              catch  IOException e1                                e1 printStackTrace                               try                               out close                              catch  IOException e1                                e1 printStackTrace

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Neither FileUtils copyDirectory   nor Archimedes s answer copy directory attributes  file owner  permissions  modification times  etc    https   stackoverflow com a 18691793 14731 provides a complete JDK7 solution that does precisely that

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This is my piece of Groovy code for that  Tested      private static void copyLargeDir File dirFrom  File dirTo          creation the target dir     if   dirTo exists             dirTo mkdir                 copying the daughter files     dirFrom eachFile FILES  File source - gt          File target   new File dirTo source getName             target bytes   source bytes               copying the daughter dirs - recursion     dirFrom eachFile DIRECTORIES  File source - gt          File target   new File dirTo source getName             copyLargeDir source  target

[java] Copy entire directory contents to another directory?

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