Switch the name of the file

Question

I have file names like 323423233.

I want to add the last 2 digits of the file name and add it to the front and make it 33/323423233 and add extension to it(like .doc).

What's a simple statement that I can use to achieve this?

Which File System supports `/` in the filename? Anyway, look at the `java.io.File` class. — SJuan76, Jun 12 '13 at 20:54
Does it have to be java? Shell scripting is more suited for this type of task. — Santa, Jun 12 '13 at 20:54
What system are you on and what tools are you using? It must be pretty strange to support a '/' in the filename - I can't guess what platform you are talking about. — D Mac, Jun 12 '13 at 20:55
@DMac - He probably wants to create directories as well. Obviously the OP has done a poor job of specifying his requirements (as well as researching how to implement them). — jahroy, Jun 12 '13 at 20:56
Guess: OP wants to _create directory `33`_ and put the file under that directory — fge, Jun 12 '13 at 20:56
"It's going inside database so / has to be used" <-- eh? Sorry, but I fail to see the relationship here — fge, Jun 12 '13 at 20:57
Do you actually want to create the new file (and validate that it can be done) or are you simply interested in manipulating the name of the file as a string? You need to be **WAY** more specific about what you want. This question is currently unanswerable. — jahroy, Jun 12 '13 at 20:59
I must disagree as to whether this question is answered by the quoted post. The quoted post does not use Java 7. — fge, Jun 12 '13 at 22:20

score 1 · Answer 1 · answered Jun 12 '13 at 21:02

This is 2013. This is Java 7. This is the time for Files and Path.

Base directory:

final Path baseDir = Paths.get("/path/to/baseDir");

Determine subdirectory for a file:

final String s = name.substring(name.length() - 2, name.length());

Create that directory:

final Path subDir = baseDir.resolve(s);
// Will not do anything if directory already exists...
// But will throw exception if unable to create
Files.createDirectories(subDir);

Write to the file:

final Path dst = subDir.resolve(name + ".doc");
Files.copy(src, dst);

Remove original:

Files.delete(src);

Or in one operation:

Files.move(src, dst);

Switch the name of the file

1 Answers1