重命名Java文件夹中的所有文件

Question

I have one folder which contains many sub-folders. To make it more clear here is an example of the folders:

Movies: MovieTitle: Moviefile.mp4 (Movie File) MovieSubtitles.srt (Subtitles) MovieSeries: MovieTitle: Moviefile.mp4 MovieSubtitles.srt I need to rename each mp4 and srt file to the following "MovieTitle". If the movie is part of a series it should be named to Series "Title + Movie Title". Lets use Star Wars as an example for series and how to name. "Star Wars" would be the name of a directory in "Movies". In "Star Wars" are 6 Folders each with a mp4 and srt file in it. For episode 1 of star wars the mp4 and srt file should be renamed to: "Star Wars - Episode 1.mp4" and "Star Wars - Episode 1.srt". If Episode 1 was not part of series it should be named to just "Episode 1.mp4"

Here is the code that I have come up with so far:

    public static void renaming(File[] files){
    String dir1, dir2;
    for(File movie: files){ //Main folder containing all of the movies.
        dir1 = movie.getName();
        for(File filesInMovie: movie.listFiles()){
            if(filesInMovie.isDirectory()){ //This means that it is a series.
                dir2 = filesInMovie.getName();
                for(File i: filesInMovie.listFiles()){
                    i.renameTo(dir1 + " - " + dir2);
                }
            }else{
                filesInMovie.renameTo(dir1)
            }               
        }

    }
}

I realize that renameTo is an actual function in Java. I thought it would rename files until I read what it actually does (which I am still a little fuzzy on). So my main question is how would I get this code to properly rename the files.

Just some extra things you should know: One Directory Contains all of the movies. There are possibilities for each folder in the movies folder It has other folders in it (It is a series) It has a mp4 and srt file in it If you have any questions please ask!!!

Answer 1

Using Guava and Java 7, here is what you can do:

public final class Renamer
{
    private static final Joiner JOINER = Joiner.on(" - ");

    private static final class RenamerVisitor
        extends SimpleFileVisitor<Path>
    {
        private final Path baseDir;

        private RenamerVisitor(final Path baseDir)
        {
            this.baseDir = baseDir;
        }

        @Override
        public FileVisitResult visitFile(final Path file,
            final BasicFileAttributes attrs)
            throws IOException
        {
            final Path relpath = baseDir.relativize(file);
            final String targetName
                = JOINER.join(Iterables.transform(relpath,
                Functions.toStringFunction()));
            final Path dstPath = baseDir.resolve(targetName);
            System.out.printf("'%s' -> '%s'\n", file, dstPath);
            return FileVisitResult.CONTINUE;
        }
    }

    public static void main(final String... args)
        throws IOException
    {
        final Path baseDir = Paths.get("/home/fge/tmp/jsr203/docs");
        Files.walkFileTree(baseDir, new RenamerVisitor(baseDir));
    }
}

This is for my environment in a directory. Sample output:

[...]
'/home/fge/tmp/jsr203/docs/java/io/class-use/File.html' -> '/home/fge/tmp/jsr203/docs/java - io - class-use - File.html'
'/home/fge/tmp/jsr203/docs/java/io/class-use/FilePermission.html' -> '/home/fge/tmp/jsr203/docs/java - io - class-use - FilePermission.html'
'/home/fge/tmp/jsr203/docs/java/io/File.html' -> '/home/fge/tmp/jsr203/docs/java - io - File.html'

In order to make it use the "real thing", replace the System.out.println() in visitFile with Files.move() and you're done!

Of course, you can also choose to copy instead, or even create a (hard) link if your filesystem supports it .

Side note: unlike File 's .renameTo() , Files.move() does not silently fail!

(and after that, you should drop Java 6's old file API fast)

Answer 2

File#getName() returns a String. You are using this to get the name of the current file and then attempting to rename the file using File#rename(String) where the method is actually defined as File#renameTo(File) . That is it the argument is expected to be a file to where you are attempting to rename the file.

Some Suggestions:

1. Look at Files.move() use this to move the file to target - Link has example of this

2. Don't use the get name method for the first directory - use the file directly (Something like below but still not correct I think) and this is if you want the file in the same base directory movies

    i.renameTo(new File(movie," - " + filesInMovie.getName() + ext); 

   Still needs work for extension of file ext however which will come from the file i