Get total size of file in bytes [duplicate]

Question

You can use the length() method on File which returns the size in bytes.

You don't need FileInputStream to calculate file size, new File(path_to_file).length() is enough. Or, if you insist, use fileinputstream.getChannel().size().

You can do that simple with Files.size(new File(filename).toPath()).

public static void main(String[] args) {
        try {
            File file = new File("test.txt");
            System.out.println(file.length());
        } catch (Exception e) {
        }
    }