Files

Files

Check Whether a File Exists

    Path path = Paths.get("data/logging.properties");

    boolean pathExists =Files.exists(path, new LinkOption[]{ LinkOption.NOFOLLOW_LINKS});

Create a Directory

    Path path = Paths.get("data/subdir");

    try {
        Path newDir = Files.createDirectory(path);
    } catch(FileAlreadyExistsException e){
        // the directory already exists.
    } catch (IOException e) {
        //something else went wrong
        e.printStackTrace();
    }

Copy a File

    Path sourcePath      = Paths.get("data/logging.properties");
    Path destinationPath = Paths.get("data/logging-copy.properties");

    try {
        // StandardCopyOption.REPLACE_EXISTING can be used to overwrite the file
        Files.copy(sourcePath, destinationPath);
    } catch(FileAlreadyExistsException e) {
        //destination file already exists
    } catch (IOException e) {
        //something else went wrong
        e.printStackTrace();
    }

Move or Rename a File

    Path sourcePath      = Paths.get("data/logging-copy.properties");
    Path destinationPath = Paths.get("data/subdir/logging-moved.properties");

    try {
        Files.move(sourcePath, destinationPath,
                StandardCopyOption.REPLACE_EXISTING);
    } catch (IOException e) {
        //moving file failed.
        e.printStackTrace();
    }

Delete a File

    Path path = Paths.get("data/subdir/logging-moved.properties");

    try {
        Files.delete(path);
    } catch (IOException e) {
        //deleting file failed
        e.printStackTrace();
    }

Recursively Traverse Files

    Files.walkFileTree(path, new FileVisitor<Path>() {
      @Override
      public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
        System.out.println("pre visit dir:" + dir);
        return FileVisitResult.CONTINUE;
      }

      @Override
      public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
        System.out.println("visit file: " + file);
        return FileVisitResult.CONTINUE;
      }

      @Override
      public FileVisitResult visitFileFailed(Path file, IOException exc) throws IOException {
        System.out.println("visit file failed: " + file);
        return FileVisitResult.CONTINUE;
      }

      @Override
      public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
        System.out.println("post visit directory: " + dir);
        return FileVisitResult.CONTINUE;
      }
    });