In my web application, I have code that generates a temporary file (based
on user input) and streams it back to the user using a StreamingResolution.
The initial implementation had a utility method that generated the file and
passed back an InputStream...
public Resolution exportCsv() throws IOException {
InputStream is = getCsvData();
StreamingResolution sr = new
StreamingResolution(Constants.CONTENT_TYPE_CSV, is);
sr.setFilename("export.csv");
return sr;
}
However, I want to be able to clean up the temporary file after it has been
streamed to the user.
I thought that I could use the anonymous inner class method described in
the stripes javadocs...
public Resolution exportCsv() throws IOException {
return new StreamingResolution(Constants.CONTENT_TYPE_CSV) {
public void stream(HttpServletResponse response) throws Exception {
File tempFile = null;
InputStream is = null;
try {
tempFile = File.createTempFile(UUID.randomUUID().toString(), null);
getCsvData(tempFile);
is = new FileInputStream(tempFile);
IOUtils.copy(is, response.getOutputStream());
is.close();
}
catch(IOException e) {
logger.error("Unable to export to csv file: " + e);
throw new IOException();
}
finally {
IOUtils.closeQuietly(is);
FileUtils.deleteQuietly(tempFile);
}
}
}.setFilename("export.csv");
}
I'm finding that if there's an exception, whatever error page my
application generates gets streamed back to the user in a file called
"export.csv". So this method isn't really viable, at least the way I'm
using it.
Is there a pattern for this sort of thing in Stripes?
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