Move file and rename if it is not being accessed by other process

[aswolff]

Hi.

I need to write a program (java) that periodically runs and checks a directory for files and for each file determine if any processes are writing to it. If not then move the file.

Can somebody point me in the right direction as to a class/method that might do this? This will be implemented on Sun Solaris 9. Java 1.4.2_10.

Thanks.

 

[wangdong]

I think if a file is being modified, Java will throw an error. If you want a more clever way to process file, you probably can find some help on Java Desktop.

Chinese Java Faq Forum

http://www.4ugo.com/bbs/index.htm

 

[sedj]

You cannot tell in java if a file is being accessed by another process - nor will an exception be thrown if you attempt to rename a file and it is still being accessed by another process.

The only way you can do is this :

String filename = "bla.txt";
String newfilename = "bla_renamed.txt";

File f = new File(filename);
File newf = new File(newfilename);

f.renameTo(newf);

if (new File(filename).exists()) {
  throw new IOException("Could not rename file - either the file permissions are incorrect, or it is being used by another process");
} else {
   System.out.println("rename of file succeeded");
}

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