递归列出给定目录中的所有文件，隐藏文件夹中的文件除外

Question

I have the following piece of code:

Files.find( startPath, Integer.MAX_VALUE, ( path, attributes ) -> path.toFile().isFile() )
            .map( p -> startPath.relativize( p ).toString() ).collect( Collectors.toList() );

Which will return a List of file names with relative path inside a given path. I am somehow stucked at additoinally excluding all the files which are placed in hidden folders somewhere along the file structure. Any suggestions?

Answer 1

You can use Files.walkFileTree instead of Files.find:

List<String> files = new ArrayList<>();

Files.walkFileTree(startPath, new SimpleFileVisitor<Path>() {
    @Override
    public FileVisitResult visitFile(Path file,
                                     BasicFileAttributes attr)
    throws IOException {
        if (attr.isRegularFile()) {
            files.add(startPath.relativize(file).toString());
        }
        return super.visitFile(file, attr);
    }

    @Override
    public FileVisitResult preVisitDirectory(Path dir,
                                             BasicFileAttributes attr)
    throws IOException {
        if (Files.isHidden(dir) ||
            (attr instanceof DosFileAttributes && 
                ((DosFileAttributes) attr).isHidden())) {

            return FileVisitResult.SKIP_SUBTREE;
        }
        return super.preVisitDirectory(dir, attr);
    }
});

The code looks longer, but it's no less efficient than Files.find.

(If you're wondering why the specific handling of DosFileAttributes is in there, it's because the documentation for Files.isHidden states, “On Windows a file is considered hidden if it isn't a directory and the DOS hidden attribute is set.”)

Answer 2

Try the following:

Replace

Files.find( startPath, Integer.MAX_VALUE, ( path, attributes ) -> path.toFile().isFile() )
            .map( p -> startPath.relativize( p ).toString() ).collect( Collectors.toList() );

with

Files.find( startPath, Integer.MAX_VALUE, ( path, attributes ) -> path.toFile().isFile() ).filter(e -> !e.toFile().isHidden())
            .map( p -> startPath.relativize( p ).toString() ).collect( Collectors.toList() );