Determining if FTP/NCFTP succeeds or fails during Java Runtime...

heres an example for reading the process output:

http://www.objects.com.au/java/examples/util/ConsoleExec.do

Also make sure that you read the input/output in a different thread, otherwise you might find yourself deadlocked :(

http://www.javaalmanac.com/egs/java.lang/ReadFromCommand.html

>> though the file is transported successfully, it does not really provide information that the file is transported properly...
Like described above, reading the stdout and stderr streams from the created process will give information about the execution of said external process. However, the absence of _any_ output on stderr should indicate succes.

Did you know that it is quite easy to do ftp up-/downloads in Java without external tools?

URL url = new URL("ftp://username:password@ftp.myhost.com/some/path/afile.ext;type=i");
URLConnection urlcon = url.openConnection();
OutputStream ftpout = urlcon.getOutputStream();
// write your file data into ftpout
ftpout.close();

If something goes wrong you'll get an exception.

Good idea x4u! expert_mentos you could just a URL provider for ncftp, and you'd be set

I agree that it makes a lot more sense to do this with Java code rather than native.

On a recent project, I went through a number of FTP client packages.  The file transfer was a critical component and I started out with the idea that a commercial package would be appropriate - I was not going to skimp on this part.  After running into problems with a number of tools, I ended up with the Jakarta Commons Net package.  It worked very well and it was the only one I tested that would correctly do FTP restart with files larger than 4GB.

You can find it at: http://jakarta.apache.org/commons/net/

>>  Good idea x4u! expert_mentos you could just a URL provider for ncftp, and you'd be set
It should read:  Good idea x4u! expert_mentos you could just WRITE a URL provider for ncftp, and you'd be set... ;-)

As said in the articles that you have recommended...   I tried waitFor() method and it is working fine...

Although if an error has occured during connection or transfer, waitFor() still returns a 0 value (success)...

int exitVal = proc.waitFor();

Is this normal...?


Also, I used getInputStream() to log the status of my transfer...   However, I found out that sometimes, even during a successful transfer, I get this message in my log...

200 PORT command successful.
150 Opening ASCII mode data connection for myfile.txt.
452 Error writing file: No space left on device.
ftp: 93 bytes sent in 0.00Seconds 93000.00Kbytes/sec.

but usually it is like this...

200 PORT command successful.
150 Opening ASCII mode data connection for myfile.txt.
226 Transfer complete.
ftp: 93 bytes sent in 0.00Seconds 93000.00Kbytes/sec.

With this behavior, I may still not be able to confirm if the file is really transferred properly or not unless I check the file in its destination folder...

May I ask if I just missed a step so that this behavior does not happen...


With regards to using URL instead, I have not yet tried it for my ftp or ncftp for transffering data (mput/ncftpput)...

May I ask how should I do my mput and ncftpput by doing ftp/ncftp in URL...


Thanks again experts...   =)

> 452 Error writing file: No space left on device.

It seems to me that there is no space left to the computer you are trying to upload the files to.