I'm new to wicket, but if I wanted to send down file data, I would use a
servlet, get the output stream and write the data.
a simple example:
writeData(InputStream in, HttpServletResponse resp) { out =
resp.getOutputStream(); byte[] data = new byte[1024]; int size = 0; while
( (size=in.read(data,1024))>=0) { out.write(data,0,size); }}
If the file is on disk, then there is no need to do this, but if it's in the db
you would do something like this. You can't do something like this in JSP,
because JSP adds a new line to all responses. You may run into issues of wicket
adds anything to the output stream.
russ
> Date: Mon, 10 Aug 2009 18:10:13 +0300
> Subject: Re: Output to input stream for streaming?
> From: [email protected]
> To: [email protected]
>
> Ouch.. Could I make the READ a blocking one... thus it would wait
> until the source is really depleted?
>
> **
> Martin
>
> 2009/8/10 Russell Simpkins <[email protected]>:
> >
> > Yes. That is exactly the point i was trying to make erik.
> >
> >> Date: Mon, 10 Aug 2009 14:30:59 +0200
> >> From: [email protected]
> >> To: [email protected]
> >> Subject: Re: Output to input stream for streaming?
> >>
> >> That won't work. Servlets are synchronous; they don't expect anyone
> >> writing the output once the servlet finished.
> >>
> >> Regards,
> >> Erik.
> >>
> >>
> >> Russell Simpkins wrote:
> >> > Its not that anything is missing per se, but if you run your output
> >> > writer in a separate thread, then the rest of your processing is free to
> >> > continue and in your case I'm guessing that the processing has finished
> >> > before your output writing has completed. When your servlet finishes,
> >> > the last thing that happens is the output stream gets closed. Try doing
> >> > the write outside of a thread and see if you get the same exception.
> >> >
> >> > Russ
> >> >
> >> >
> >> >> Date: Mon, 10 Aug 2009 15:03:13 +0300
> >> >> Subject: Re: Output to input stream for streaming?
> >> >> From: [email protected]
> >> >> To: [email protected]
> >> >>
> >> >> Well well.. I do not understand why it is not possible, in principle.
> >> >> The input is there. The output is there... what's missing?
> >> >>
> >> >> **
> >> >> Martin
> >> >>
> >> >> 2009/8/10 Russell Simpkins <[email protected]>:
> >> >>
> >> >>> Martin,
> >> >>>
> >> >>> I don't think you can do this in a thread because that lets the
> >> >>> HttpServletResponse end and close your ServletOutputStream.
> >> >>>
> >> >>> Russ
> >> >>>
> >> >>>
> >> >>>> Date: Mon, 10 Aug 2009 14:49:58 +0300
> >> >>>> Subject: Output to input stream for streaming?
> >> >>>> From: [email protected]
> >> >>>> To: [email protected]
> >> >>>>
> >> >>>> Hi!
> >> >>>>
> >> >>>> I have a HSSF document which can be written to an output stream.
> >> >>>> However, I want to stream it to the website visitor, which requires an
> >> >>>> inputstream... I have tried the following, but it somehow doesn't seem
> >> >>>> to work.
> >> >>>>
> >> >>>> Anybody know what can be done to fix it?
> >> >>>>
> >> >>>> final PipedInputStream inputStream = new PipedInputStream();
> >> >>>> final PipedOutputStream out;
> >> >>>> try {
> >> >>>> out = new PipedOutputStream(inputStream);
> >> >>>> } catch (IOException e) {
> >> >>>> throw new RuntimeException(e);
> >> >>>> }
> >> >>>> Executors.newSingleThreadExecutor().execute(new Runnable() {
> >> >>>> @Override
> >> >>>> public void run() {
> >> >>>> try {
> >> >>>> wb.write(out);
> >> >>>> } catch (IOException e) {
> >> >>>> MarkupUtils.handleUnexpectedException(e);
> >> >>>> }
> >> >>>> }
> >> >>>> });
> >> >>>>
> >> >>>> IResourceStream resourceStream = new IResourceStream() {
> >> >>>> /**
> >> >>>> * @see org.apache.wicket.util.resource.IResourceStream#close()
> >> >>>> */
> >> >>>> public void close() throws IOException {
> >> >>>> inputStream.close();
> >> >>>> }
> >> >>>>
> >> >>>> /**
> >> >>>> * @see
> >> >>>> org.apache.wicket.util.resource.IResourceStream#getContentType()
> >> >>>> */
> >> >>>> public String getContentType() {
> >> >>>> return getAlternateContentType();
> >> >>>> }
> >> >>>>
> >> >>>> /**
> >> >>>> * @see
> >> >>>> org.apache.wicket.util.resource.IResourceStream#getInputStream()
> >> >>>> */
> >> >>>> public InputStream getInputStream()
> >> >>>> throws ResourceStreamNotFoundException {
> >> >>>> return inputStream;
> >> >>>> }
> >> >>>>
> >> >>>> /**
> >> >>>> * @see
> >> >>>> org.apache.wicket.util.resource.IResourceStream#getLocale()
> >> >>>> */
> >> >>>> public Locale getLocale() {
> >> >>>> throw new IllegalAccessError("Method not implemented.");
> >> >>>> }
> >> >>>>
> >> >>>> /**
> >> >>>> * @see org.apache.wicket.util.resource.IResourceStream#length()
> >> >>>> */
> >> >>>> public long length() {
> >> >>>> try {
> >> >>>> return inputStream.available();
> >> >>>> } catch (IOException e) {
> >> >>>> MarkupUtils.handleUnexpectedException(e);
> >> >>>> }
> >> >>>> return 0;
> >> >>>> }
> >> >>>>
> >> >>>> /**
> >> >>>> * @see
> >> >>>> org.apache.wicket.util.resource.IResourceStream#setLocale(java.util.Locale)
> >> >>>> */
> >> >>>> public void setLocale(Locale locale) {
> >> >>>> throw new IllegalAccessError("Method not implemented.");
> >> >>>> }
> >> >>>>
> >> >>>> /**
> >> >>>> * @see
> >> >>>> org.apache.wicket.util.watch.IModifiable#lastModifiedTime()
> >> >>>> */
> >> >>>> public Time lastModifiedTime() {
> >> >>>> return
> >> >>>> Time.milliseconds(DatabaseServices.getCurrentTimestamp().getTime());
> >> >>>> }
> >> >>>>
> >> >>>> };
> >> >>>>
> >> >>>> java.io.IOException: Pipe closed
> >> >>>> at java.io.PipedInputStream.checkStateForReceive(Unknown Source)
> >> >>>> at java.io.PipedInputStream.receive(Unknown Source)
> >> >>>> at java.io.PipedOutputStream.write(Unknown Source)
> >> >>>> at java.io.OutputStream.write(Unknown Source)
> >> >>>> at
> >> >>>> org.apache.poi.poifs.storage.BigBlock.doWriteData(BigBlock.java:55)
> >> >>>> at
> >> >>>> org.apache.poi.poifs.storage.DocumentBlock.writeData(DocumentBlock.java:220)
> >> >>>> at
> >> >>>> org.apache.poi.poifs.storage.BigBlock.writeBlocks(BigBlock.java:86)
> >> >>>> at
> >> >>>> org.apache.poi.poifs.filesystem.POIFSDocument$BigBlockStore.writeBlocks(POIFSDocument.java:603)
> >> >>>> at
> >> >>>> org.apache.poi.poifs.filesystem.POIFSDocument.writeBlocks(POIFSDocument.java:275)
> >> >>>> at
> >> >>>> org.apache.poi.poifs.filesystem.POIFSFileSystem.writeFilesystem(POIFSFileSystem.java:390)
> >> >>>> at
> >> >>>> org.apache.poi.hssf.usermodel.HSSFWorkbook.write(HSSFWorkbook.java:1168)
> >> >>>>
> >> >>>>
> >> >>>>
> >> >>>> **
> >> >>>> Martin
> >> >>>>
> >> >>>>
> >> >>>>
> >>
> >> --
> >> Erik van Oosten
> >> http://day-to-day-stuff.blogspot.com/
> >>
> >>
> >>
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> >>
> >
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