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kunal dexit
kunal dexit

Reputation: 107

File.canWrite is not working as per expectations

i am trying to check whether a file is writable or not. i have changed the file permission by myself for all users. but if i try to run the program, it show "true" as a response. if i allow the permissions, then also it is showing "true".

Whats is my problem? 

try
  {

     File file = new File("D:/myproject_log/delivery_report_edr.out"); 

        if(!file.canWrite())
        {
            System.out.println("you can't write!!!");
        }
        else
            System.out.println("you can write!!!");
  }
  catch(Exception e)
  {
      e.printStackTrace();
  }

Upvotes: 3

Views: 6889

Answers (4)

Ups
Ups

Reputation: 13

I had the same issue with a file located in c:\programFiles\folder and the File.canWrite method returned true and i was getting the same exception. when i changed the permission of write as allowed true for USER defined in security tab of Folder properties, It gave me no exception.

Upvotes: 0

racc
racc

Reputation: 1282

Have you tried using the java.nio.file.Files#isWritable method. as well as File#canWrite ?

Upvotes: 3

Bob
Bob

Reputation: 1

I have also found that File.canWrite() cannot be trusted, especially over network drives, often returning true even though a file write will fail or vice-versa. I made my own method that actually tries to write a dummy file to the dir. That is simple to write and foolproof. Maybe they fixed it though.

Upvotes: 0

Chandra Sekhar
Chandra Sekhar

Reputation: 19500

It is working fine. I copied your code and run it twice. First I got You can write, then right click on the file folder, go to properties and select read only and run the program again and I got you can't write

So as per the documentation of the method canWrite() it gave me the expected output. Please confirm your settings once again and check.

Upvotes: 2

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