How can I use an Inputstream twice?

Question

Hi,
I have to read a ServletInputStream more than one time. But how can I do this? I first tried to use mark() and reset() but that doesn't work. After that I tried to copy the InputStream into a byte[] with:
byte[] inByte = new byte[request.getContentLength()];
      InputStream sin = request.getInputStream();
      sin.read(inByte);
InputStream in = new ByteArrayInputStream(inByte);But if the InputStream of the request is too big, I could not read the whole stream (and the sin.available doesn't because its always 0).
Is there perhaps a class available where I can put my InputStream without parsing every single byte to a byte[] ?

Answer 1

Hi,
if I am trying to put the request.getInputStream into an InputSource the request inputStream will be read and thats just the same if I use the request.getInputStream directly twice.
InputSource inSource = new InputSource(request.getInputStream());Could I perhaps clone the InputStream in some way?
To save the Stream into a temp File is not an option because I would have to solve the issue to reade the proper file, if the Servlet would be hit 20x at the same time.
Has anyone perhaps another idea how I can solve my issue?
Edit: I think I try to transform my XML Stream to a DOM/SAX and build new stream based on this new object.
Edited by: Troilus on Oct 17, 2007 12:52 AM