Performance of BufferedOutputStream.write() 2005-01-07 - By Frans Verhoef
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Maybe you could send the part of the code which is involved in the streaming of
the file in your servlet?
Frans
On Fri, 7 Jan 2005 14:18:07 +0900, Jean-Christian Imbeault wrote:
>?For security reasons we don't allow our users direct access to pdf
>?files located on our application server. They have to request them
>?through a servlet and then the servlet streams the file back to the
>?client.
>
>?However we have some performance issues. Files take a long time to
>?streamed compared to the time it takes to get the file if it's
>?served up as a file (a direct URL to the file). a 200kb file might
>?take 2 s to load from a link but about 10 s when going through the
>?servlet.
>
>?We're not sure if the performance problem is a direct result of
>?using a servlet to stream the file (i.e. you need to first read the
>?file, then stream it) or some other problem with our application
>?configuration.
>
>?Can someone give me their opinion on the following servlet code?
>
>?Two things I am wondering about are:
>
>?#1- passing a file around in the request object is a bad thing, or
>?a performance issue #2- streaming the file is not very efficient
>
>?I think #1 might be an issue especially considering that the files
>?ar from 200kb - 2Mb. Putting such a large object into memory just
>?doesn't seem right.
>
>?As for #2 I don't know. A web server basically as to read the file
>?and then stream it anyway so there should be much difference if I
>?usurp the web server and do all the file reading and streaming
>?myself...
>
>?Thanks,
>
>?Jc
>
>?==The code=>
>
>?public class FileDownloadServlet extends HttpServlet { public void
>?doPost(HttpServletRequest req, HttpServletResponse res) throws
>?ServletException, IOException {
>
>?ServletOutputStream out = res.getOutputStream(); FileContentVO
>?fileContentVO >?(FileContentVO) req.getAttribute(AppConstants.OUTPUT_OBJECT);
>?String fileName = fileContentVO.getFileName();
>
>?/********** preventing browser from caching **********/
>
>?res.setHeader("Pragma", "No-cache");
>?res.setDateHeader("Expires", 0);
>?res.setHeader("Cache-Control", "no-cache");
>
>?/***********************End***************************/
>
>?res.setContentType("application/pdf");
>?res.setHeader("Content-disposition", "inline; filename=" +
>?fileName);
>
>?BufferedOutputStream bos = null;
>?byte[] buff = null;
>
>?try {
>?bos = new BufferedOutputStream(out);
>
>?/* the file was read from disk and put in the VO */ buff >?fileContentVO
.getFileContent(); bos.write(buff, 0, buff.length);
>
>?if (bos != null) {
>?bos.close();
>?}
>
>?}
>?catch (final MalformedURLException e) {
>?throw e;
>?}
>?catch (final IOException e) {
>?throw e;
>?}
>?catch (Exception e) {
>?}
>?finally {
>?buff = null;
>?}
>?}
>?}
>
>
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