How to lock or give password to file

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Java

import java.io.*;

public class CreateFile1{
  public static void main(String[] args) throws IOException{
  File f;
  f=new File("myfile.txt");
  if(!f.exists()){
  f.createNewFile();
  System.out.println("New file \"myfile.txt\" has been created 
  to the current directory");
  }
  }
}

Can we lock this file with password. So that when anyone open this file in program or manually it should ask for password.

Posted 10-Feb-12 6:46am

CurrentlyBE

Updated 10-Feb-12 16:43pm

Chris Maunder775.8K

v2

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CurrentlyBE 13-Feb-12 8:37am

what does this do

try {
// Get a file channel for the file
File file = new File("filename");
FileChannel channel = new RandomAccessFile(file, "rw").getChannel();

// Use the file channel to create a lock on the file.
// This method blocks until it can retrieve the lock.
FileLock lock = channel.lock();

// Try acquiring the lock without blocking. This method returns
// null or throws an exception if the file is already locked.
try {
lock = channel.tryLock();
} catch (OverlappingFileLockException e) {
// File is already locked in this thread or virtual machine
}

// Release the lock
lock.release();

// Close the file
channel.close();
} catch (Exception e) {
}

CurrentlyBE 13-Feb-12 8:47am

found another link

http://www.javabeat.net/tips/37-locking-files-using-java.html

check it out

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Christian Graus · Answer 1 · 2012-02-10T06:54:00

Solution 1

You can't. Certainly not in Java. To do this requires a shell extension to run on the end machine. The closest you can do, is to put it in a password protected zip.

Posted 10-Feb-12 6:54am

Christian Graus

v2

Comments

CurrentlyBE 10-Feb-12 13:06pm

Really it can't happen disappointed by knowing this.

Christian Graus 10-Feb-12 13:12pm

It seems obvious to me that your operating system, written in C, is going to open a txt file in the way that it always does, and there's no way to embedd Java code in a txt file, or to make the OS run it when someone tries to open that file.