Solved

How can i check File is Transfered/Copied completely in a folder,through a java code.

Posted on 2009-05-18
15
329 Views
Last Modified: 2013-11-23
My Friend is copying a large File in a specified folder.How can i check through java code that file transfer is completed.
0
Comment
Question by:manzar_chaudhary
  • 8
  • 6
15 Comments
 
LVL 86

Expert Comment

by:CEHJ
ID: 24412151
Check the file size? ME5 sum?
0
 

Author Comment

by:manzar_chaudhary
ID: 24412198
file.length() remains constant during the course of transfer.
0
 
LVL 12

Expert Comment

by:Gibu George
ID: 24412270
You need to check the size of the file in the target folder  and then compare with source folder
0
Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

 

Author Comment

by:manzar_chaudhary
ID: 24412294
i don't have acces to the source folder.further if i check the filesize (file.length()) it is constant through out the transfer.
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 24412318
You can't tell if it's complete with certainty unless you know the source file size. When/if you do, you can compare the size as i mentioned.
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 24412326
>>i don't have acces to the source folder.

How do/can you transfer it then?
0
 

Author Comment

by:manzar_chaudhary
ID: 24412455
As i said my friend is copying the file manually.I have a thread which monitors the specified folder.
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 24412486
Actually you didn't mention anything about manually. There is no way to know unless you somehow store the file's size in the file itself
0
 

Author Comment

by:manzar_chaudhary
ID: 24412693
I have written following snippet and it worked but i don't know whether its a proper way to do it.
public static void main(String args[]){
        boolean flag = true;
        while(flag){
            File file  = new File("XXX.xxx");
            if(file.exists()){
                BufferedReader br;
                try {
                    Thread.sleep(1000);
                    br = new BufferedReader(new FileReader(file));
                    while(br.readLine() != null){
                        
                    }
                    System.err.println("File Copied..");
                    flag = false;
                } catch (Exception ex) {
                    System.err.println("File is Getting Copied..");
                    
                }
            }
        }
    }

Open in new window

0
 
LVL 86

Expert Comment

by:CEHJ
ID: 24412730
You might try obtaining a lock on the File. It shouldn't let you if it's being written to
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 24412741
0
 

Author Comment

by:manzar_chaudhary
ID: 24412797
yes you r write..but is there any harm in acquiring a lock..
actually windows(dnt know bout linux) locks the file while copying it and dosent release the lock  untill an unless it copies the file completely..i am just exploiting it..
thanks for suggesting a better way of accquiring a lock
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 24412823
>>yes you r write..but is there any harm in acquiring a lock..

None. As soon as you get it you can release it in a finally block
0
 

Author Comment

by:manzar_chaudhary
ID: 24412844
so that means i can figure out whether file is getting tranfer or trasnferd completely using lock method.
do you think is there any other mechanism to do so...
0
 
LVL 86

Accepted Solution

by:
CEHJ earned 50 total points
ID: 24412881
I think that's the simplest way, but i wouldn't like to say any is infallible unless it's the way i last mentioned. You should experiment
0

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

This was posted to the Netbeans forum a Feb, 2010 and I also sent it to Verisign. Who didn't help much in my struggles to get my application signed. ------------------------- Start The idea here is to target your cell phones with the correct…
Introduction This article is the first of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article explains our test automation goals. Then rationale is given for the tools we use to a…
Video by: Michael
Viewers learn about how to reduce the potential repetitiveness of coding in main by developing methods to perform specific tasks for their program. Additionally, objects are introduced for the purpose of learning how to call methods in Java. Define …
This tutorial will introduce the viewer to VisualVM for the Java platform application. This video explains an example program and covers the Overview, Monitor, and Heap Dump tabs.

828 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question