Return BLOB Value

[Sascha Kulawik <sa...@kulawik.de>]

Hello,

I'm trying to implement a File-Upload / Download for a small Forum
written in Cocoon XSP.
Currently Ive no idea how to implement the FileDownload. The easiest way
for that would be to write the data to a mySQL Ressouce and read the
data because of Userpermissions and so on.

Is it possible, to returm plain BLOB Data from a Database to the User
for a Download ?
Is there a better way to implement that in Cocoon ?

Thank you very much,

Greetings,
Sascha

Re: Return BLOB Value

[Jeroen ter Voorde <j....@home.nl>]

Return BLOB ValueYou can use a Reader to implement this (That's what i did).

(Stripped) Example:

public class Reader extends AbstractReader implements Poolable, Composable {

 Request request = null;
 Response response = null;
 Context context = null;
 ComponentManager manager = null;

 public void setup(SourceResolver resolver, Map objectModel, String src, Parameters par) throws ProcessingException, SAXException, IOException {
  super.setup(resolver, objectModel, src, par);
  context = ObjectModelHelper.getContext(objectModel);
  request = ObjectModelHelper.getRequest(objectModel);
  response = ObjectModelHelper.getResponse(objectModel);
 }

  public void generate() throws IOException, SAXException, ProcessingException {
    
  try {
    response.setHeader("Cache-Control", "no-cache");
    response.setHeader("Pragma", "no-cache");
    response.setDateHeader("Expires", 0);

   // out is the outputstream to write your blob data to.

    ((OutputStream)out).write('The blob data');

   }
  } catch (Exception e) {   
   throw new ProcessingException("Error in reader: "+e);
  }
 }

 public String getMimeType() {
  return context.getMimeType(source.substring(source.lastIndexOf("/") + 1));
 }
}

----- Original Message ----- 
  From: Sascha Kulawik 
  To: cocoon-users@xml.apache.org 
  Sent: Friday, July 26, 2002 10:07 PM
  Subject: Return BLOB Value


  Hello, 

  I'm trying to implement a File-Upload / Download for a small Forum written in Cocoon XSP. 
  Currently Ive no idea how to implement the FileDownload. The easiest way for that would be to write the data to a mySQL Ressouce and read the data because of Userpermissions and so on.

  Is it possible, to returm plain BLOB Data from a Database to the User for a Download ? 
  Is there a better way to implement that in Cocoon ? 

  Thank you very much, 

  Greetings, 
  Sascha