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FTP copying file with reduced to zero size.

 
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The function down allows connectar in another servant and to copy a file,
only that the copy this with reduced to zero size. What done this miss?
import java.io.*;
import com.oroinc.net.ftp.*;
public final class FTP {
public static final void main(String[] args) {
FTPClient client;
client = new FTPClient();
try {
client.connect("ftp.javasoft.com");
if(!FTPReply.isPositiveCompletion(client.getReplyCode())) {
client.disconnect();
System.err.println("FTP server refused connection.");
return;
}
client.login("anonymous", "user@hostname");
client.retrieveFile("c:/user/back2a.gif", new FileOutputStream("e:/temp/back2a.gif"));
client.quit();
client.disconnect();
}
catch(IOException e) {
e.printStackTrace();
}
}
}
 
Wanderer
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The documentation for FTPClient specifically says that retrieveFile() does not close the OutputStream you give it. That's your job:
 
Anonymous
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import java.io.*;
import com.oroinc.net.ftp.*;
public final class FTPx {
public static final void main(String[] args) {
FTPClient client;
client = new FTPClient();
try {
client.connect("192.108.10.56");
client.login("sa","sa");
String local = args[0];
String remote = args[1];

OutputStream output;
output = new FileOutputStream(local);
client.retrieveFile(remote, output);
output.close();
client.quit();
client.disconnect();
}
catch(IOException e) {
e.printStackTrace();
}
}
}
 
Anonymous
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I continue with the problem of it copies of reduced to zero file. Even with the new source (according to source above)
 
Jim Yingst
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Strange. Try breaking the process into smaller parts and putting in print statements to report on the progress of each part:

Looking at the output of this, you can get a better idea exactly what is happening (and what isn't). Are any bytes being read at all?
 
Anonymous
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Jim Yingst, I thank for his/her help. With the script that you sent me, I located the problem, but I still didn't solve the problem.
The mistake this happening as it tries to attribute the "length = input.read(buffer); " in the first time of the loop.

I still didn't find the definitive solution. In case you have an idea, please find out.

Once again thankful for the help.
 
Jim Yingst
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Jim Yingst, I thank for his/her help
"His", please. You're welcome.
Well, what exactly happens? Does it read the length as -1? Does it throw an exception?
It's possible the FTPClient code is buggy; I've never used it, so I don't know. People seem happy with other ORO Software products, so I gather they're pretty good in general. But I dunno in this case.
Have you tried using the java.net.URL class instead? It should work with an "ftp://" protocol in place of the usual "http://". Then use openStream() to get an input stream from the named URL. I haven't used these classes much either, but since they're part of the standard Java SDK I expect them to work in most cases. Worth a try anyway if you can't get the FTPClient to work.
[ August 17, 2002: Message edited by: Jim Yingst ]
 
Jim Yingst
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Also worth exploring:

This could provide more clues about whether FTPClient thinks there's really a file there or not, and how many bytes it has.
 
Greenhorn
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I get the same problem and I find "ftp.retrieveFile(file.getName(),fos)"
return false. why?
 
Greenhorn
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I get the same error.
"ftp.retrieveFile(file.getName(),fos)"
return false. Don't know why? the file transfered is 0 bytes.
 
Greenhorn
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Hi,

Did anyone of you find what the cause is?

I am also getting problem with ftp.retreiveFile().

Thank you
 
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