Check if file or folder is open before delete

Question

How to check if a file / folder is open before i try to delete it.
Am deleting it programmatically.. before deleting, need to check whether its opened or not

I want something like this,

            if(file/folder is open){
               //do not delete it
            }else{
               //delete it
             }

I tried the below set of two codes, but nothing is working

     File scrptFile=new File(dirFile);
     boolean isFileUnlocked = false;
try {
    org.apache.commons.io.FileUtils.touch(scrptFile);
    isFileUnlocked = true;
} catch (IOException e) {
    isFileUnlocked = false;
}

if(isFileUnlocked){
    // Do stuff you need to do with a file that is NOT locked.
    System.out.println("file is not locked");
} else {
    // Do stuff you need to do with a file that IS locked
    System.out.println("file is locked");
}


       File file = new File(dirFile);
FileChannel channel = new RandomAccessFile(file, "rw").getChannel();
// Get an exclusive lock on the whole file
FileLock lock = channel.lock();
try {
    lock = channel.tryLock();
    // Ok. You get the lock
    System.out.println("Ok. You get the lock");
} catch (OverlappingFileLockException e) {
    // File is open by someone else
    System.out.println("File is open by someone else");
} finally {
    lock.release();
}

Interesting idea, but given the fact that a file lock is OS dependent (and under some OS with multiple different approaches) it might be difficult to ascertain in a clean way. The best way is to try. File#delete returns false if it couldn't delete the file for some reason — MadProgrammer, Nov 05 '13 at 07:40
Can u check http://stackoverflow.com/questions/9341505/how-to-check-if-a-file-is-open-by-another-process-java-linux and http://stackoverflow.com/questions/15352010/check-if-a-file-is-open-before-reading-it — Karthik, Nov 05 '13 at 07:40

Dark Knight · Answer 1 · 2013-11-05T07:49:54.740

0

You can make use of Apache commons io api,

  boolean flagFileNotInUse = false;
try {
    org.apache.commons.io.FileUtils.touch(yourFile);
    flagFileNotInUse = true;
} catch (IOException e) {
    flagFileNotInUse = false;
}

// Then check value of flagFileNotInUse ,

  flagFileNotInUse = true, means file not in use
  flagFileNotInUse = false, means file in use

edited Nov 05 '13 at 07:49

answered Nov 05 '13 at 07:41

Dark Knight

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Wouldn't it be more clear if you either name the bool flagFileNotInUse or swap the values of the flag? – RFerwerda Nov 05 '13 at 07:48
@RFerwerda : Please refer to updated post. – Dark Knight Nov 05 '13 at 07:50
the above code is working for folder but not for file @DarkKnight – user2941293 Nov 05 '13 at 08:56

Check if file or folder is open before delete

1 Answers1