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Old 06-16-2009, 11:26 AM   #1 (permalink)
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Default Blackberry FTP Program

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I have been able to successfully implement a connect() method by doing the following:

connection = (SocketConnection)"socket://" + host+ ":" + port + ";deviceside=true");
download = new InputStreamReader(connection.openInputStream());
upload = new OutputStreamWriter(connection.openOutputStream());

I am able to connect and send commands to the FTP server to create folders, rename files, change the directory, etc. They have been fully tested and I am sure they work.

The challenge now is to be able to create an additional socket to port 20 for data transfer. This is where I am running into issues. I feel that my logic is sound, but I am new to the Blackberry API. This is my download method so far:

public void download(String requestedFile, String destinationLocation) throws Exception
String response = sendFTPCommand("RETR " + requestedFile);

SocketConnection dataConnection = (SocketConnection)"socket://" + host + ":20;deviceside=true");
InputStreamReader dataDownload = new InputStreamReader(dataConnection.openDataInputStre am());

if(!response.startsWith("150 "))
throw new Exception("Failure occured at the beginning of the download.");

FileOutputStream fileWriter = new FileOutputStream(File.FILESYSTEM_PATRIOT, destinationLocation);

int i = 0;
while ((i = != -1)

//Close the streams
catch(Exception e)
System.err.println(requestedFile + " cannot be found.");
When I run the program, I get the following error: Peer refused the connection

I have experimented with a lot of different ideas, but none of them worked. Any help would be appreciated.

Last edited by russkie : 06-16-2009 at 11:30 AM.
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