Java: Using nio Files.copy to Move Directory
Simply make the destination directory if it doesn't exist.
File sourceDir = new File(source); //this directory already exists
File destDir = new File(dest); //this is a new directory
destDir.mkdirs(); // make sure that the dest directory exists
Path destPath = destDir.toPath();
for (File sourceFile : sourceDir.listFiles()) {
Path sourcePath = sourceFile.toPath();
Files.copy(sourcePath, destPath.resolve(sourcePath.getFileName()));
}
Note that sourceDir.listFiles()
will also return directories, which you will either want t recurse into, or ignore...
This is my solution for recursively moving a directory from source to target. It works like a charm.
public static void move(Path source, Path target) throws IOException {
class FileMover extends SimpleFileVisitor<Path> {
private Path source;
private Path target;
private FileMover(Path source, Path target) {
this.source = source;
this.target = target;
}
@Override
public FileVisitResult visitFile(final Path file, final BasicFileAttributes attrs) throws IOException {
Files.move(file, target.resolve(source.relativize(file)),
StandardCopyOption.REPLACE_EXISTING);
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult preVisitDirectory(final Path dir, final BasicFileAttributes attrs) throws IOException {
Path newDir = target.resolve(source.relativize(dir));
try {
Files.copy(dir, newDir,
StandardCopyOption.COPY_ATTRIBUTES,
StandardCopyOption.REPLACE_EXISTING);
} catch (DirectoryNotEmptyException e) {
// ignore and skip
}
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult postVisitDirectory(final Path dir, final IOException exc) throws IOException {
Path newDir = target.resolve(source.relativize(dir));
FileTime time = Files.getLastModifiedTime(dir);
Files.setLastModifiedTime(newDir, time);
Files.delete(dir);
return FileVisitResult.CONTINUE;
}
}
FileMover fm = new FileMover(source, target);
EnumSet<FileVisitOption> opts = EnumSet.of(FileVisitOption.FOLLOW_LINKS);
Files.walkFileTree(source, opts, Integer.MAX_VALUE, fm);
}
You need to use walkFileTree to copy directories. If you use Files.copy on a directory only an empty directory will be created.
Following code taken/adapted from http://codingjunkie.net/java-7-copy-move/
File src = new File("c:\\temp\\srctest");
File dest = new File("c:\\temp\\desttest");
Path srcPath = src.toPath();
Path destPath = dest.toPath();
Files.walkFileTree(srcPath, new CopyDirVisitor(srcPath, destPath, StandardCopyOption.REPLACE_EXISTING));
public static class CopyDirVisitor extends SimpleFileVisitor<Path>
{
private final Path fromPath;
private final Path toPath;
private final CopyOption copyOption;
public CopyDirVisitor(Path fromPath, Path toPath, CopyOption copyOption)
{
this.fromPath = fromPath;
this.toPath = toPath;
this.copyOption = copyOption;
}
@Override
public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException
{
Path targetPath = toPath.resolve(fromPath.relativize(dir));
if( !Files.exists(targetPath) )
{
Files.createDirectory(targetPath);
}
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException
{
Files.copy(file, toPath.resolve(fromPath.relativize(file)), copyOption);
return FileVisitResult.CONTINUE;
}
}