Copy entire directory contents to another directory? [duplicate]

Question

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

Answer 1

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(); } 

Answer 2

The following is an example of using JDK7.

public class CopyFileVisitor extends SimpleFileVisitor<Path> {     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<Path>() {         @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;         }     });