Multiple Files in an InputStream

[Chris Cornelius]

Hello,

I have a method that takes an arraylist of tif objects and sends them
to another method to extract them from a database and put them into
a HttpServletResponse to be sent to a tiff viewer applet running in a jsp.
My problem is that I need to send multiple files to the applet in a single stream for the viewer to show every file. Here is the code I have, which works for a single image.

private String getImage(HttpServletRequest request, HttpServletResponse response)
{
logger.config("WorkQueueRH.getImage()");

HttpSession session = request.getSession();

try
{
Applicant applicant = (Applicant) session.getAttribute("Applicant");

response.setContentType("image/tif");

ArrayList listOfImages = applicant.getImageList();

if (listOfImages != null )
{
for (int x = 0; x < listOfImages.size(); x++)
{
Image image = (Image) listOfImages.get(x);

if (image != null)
{
image.sendBlobToStream(response.getOutputStream());
}
}
}
else
{
Image.sendStreamtoStream(response.getOutputStream(), 
this.getClass().getResourceAsStream("/NoImageAvailable.tif"));
}
}
catch (IOException e)
{
logger.warning("Unable to process the request: (" + e.getMessage() + ")");
e.printStackTrace();
cleanOutSession(request, response);
MessageBean message = new MessageBean("Unable to process the image.  " +
"Please call the support desk.", "AppErr010");
session.setAttribute("message", message);
}
catch (AppException e)
{
logger.warning("Unable to process the request: (" + e.getMessage() + ")");
e.printStackTrace();
cleanOutSession(request, response);
MessageBean message = new MessageBean("Application Error.  Please call " + 
"the support desk.", "AppErr004");
session.setAttribute("message", message);
}

return null;
}
 
public void sendBlobToStream(OutputStream sos) throws AppException
{
try
{
InputStream in = this.applicationImage.getBinaryStream();
        byte[] bytes = new byte[4 * 1028];
        int read;
read = in.read(bytes);
        while(read != -1) {
            sos.write(bytes);
            read = in.read(bytes);
        }
        in.close();
}
catch (SQLException sqle)
{
throw new AppException("Can't get blob.", sqle);
}
catch (IOException e)
{
throw new AppException("Can't get blob.", e);
}
}

Any suggestions, ideas would be greatly appreciated.

Chris Cornelius

[Paul Clapham]

which works for a single image

Do you mean to imply that it doesn't work for more than one image? In what way doesn't it work?

I would expect it to not work because two or more images concatenated together in a single stream can't be handled by something that's expecting an image. But maybe the applet you're sending this to does have some way of extracting the images from the data stream, I don't know.

[Chris Cornelius]

The images are loaded, but the viewer only displays
the first image that is streamed. It might just be the
viewer, will look into that more.

Thanks,

Chris