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removing  last characters of a file name java

Posted on 2015-01-21
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Last Modified: 2015-01-21
Hi: I have some  third party software that takes a file from an email and puts in a folder, adding date and time.
Thus file 12345.dxe becomes "123452015-01-21 11-58.dxe". Now it does this for many types files but for really sad reasons I need to rename the  dxe file back to 12345.dxe before I can process it further. I need to go through the whole process I am afraid ; I cannot change the process for just these types.
My 'second' process - where I work on the file - is java so does anybody know how to write something like: "for each dxe file in the folder DELETE THE LAST 16 CHARACTERS OF THE NAME then do x"? (where the bit I need is in capitals). The first part of the file name may not be a fixed length but the date and time are always 16 characters.
Thanks!
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Question by:ClaytonGlass
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3 Comments
 
LVL 86

Accepted Solution

by:
CEHJ earned 250 total points
ID: 40561875
I would use a regex for this, as non-matching file names would be unaffected
        String origName = ...;
        String newName = origName.replaceAll("(.*?)\\d{4}-\\d{2}-\\d{2} \\d{2}-\\d{2}(.*)",
                "$1$2");
        File f = new File(origName);

        if (f.renameTo(new File(newName))) {
            System.out.printf("Renamed %s to %s%n", origName, newName);
        } else {
            System.err.printf("Couldn't rename %s to %s%n", origName, newName);
        }

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LVL 35

Assisted Solution

by:Kimputer
Kimputer earned 250 total points
ID: 40561889
Just hints and pointers for you, not 100% working code (you should do that yourself).

Since you already know the exact things you want to delete, this code should be sufficient

String abc = new String("123452015-01-21 11-58.dxe");
System.out.println(abc.substring(0,(abc.length()-20))+abc.substring((abc.length()-4),abc.length()));

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looping can be done with default code, and adding this if statement (use file name of course)

abc.substring((abc.length()-4),abc.length()) == ".dxe"

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If you keep the code simple, it will assume there are NO .dxe files that are shorter than what you stated (i.e. you are 100% sure there will never be a abc.dxe file in that folder). If you aren't sure, you need to add more code to make sure you escape this when it happens.
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Author Closing Comment

by:ClaytonGlass
ID: 40561904
Many thanks to you both for some great suggestions. I can see merits in either and will try both but points awarded equally for great responses. Thanks again
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