Robert's Tapestry 3's method works, but Tapestry 4's method might cause
some problems, at least it did when I tried it. I believe it has to do
with closing the response outputstream before rewind or the rest of
rendering is complete. User will be able to download the file
successfully, but you'll see an error in your logs about OutputStream is
already closed (or something along those lines). To get around this
error, I had to implement my own download engine service, as Shing
suggested.
Dennis
Robert J. Walker wrote:
Here's a method that will do what you're asking:
// Tapestry 3
protected void download(IRequestCycle cycle, ByteArrayOutputStream content,
String contentType, String filename) throws IOException {
HttpServletResponse response = cycle.getRequestContext().getResponse();
response.setHeader("Content-disposition", "attachment; filename=" +
filename);
response.setContentType(contentType);
response.setContentLength(content.size());
response.getOutputStream().write(content.toByteArray());
response.flushBuffer();
response.getOutputStream().close();
}
// Tapestry 4
protected void download(IRequestCycle cycle, ByteArrayOutputStream content,
String contentType, String filename) throws IOException {
WebResponse response = cycle.getInfrastructure().getResponse();
response.setHeader("Content-disposition", "attachment; filename=" +
filename);
response.setIntHeader("Content-Length", content.size());
OutputStream stream = response.getOutputStream(new
ContentType(contentType));
stream.write(content.toByteArray());
stream.flush();
stream.close();
}
You should make sure that the filename you provide is compatible with the
user's operating system, or you could run into problems. It's also advisable to
make the file extension jive with the content type so that the user doesn't
have to rename the file to open it. Hope this helps.
Robert J. Walker
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