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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