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From "Todd Wilson" <t...@screen-scraper.com>
Subject Re: Downloading partial content in HttpClient 4
Date Tue, 31 Aug 2010 16:29:21 GMT
Thanks much for the advice, Oleg; that worked great.  For any
interested, I'm attaching the source of the class.

Todd


On Thu, 26 Aug 2010 10:33 +0200, "Oleg Kalnichevski" <olegk@apache.org>
wrote:
> On Tue, 2010-08-24 at 16:06 -0600, Todd Wilson wrote:
> > Greetings,
> > 
> > I'm transitioning from HttpClient 3 to 4.  I believe I've done all of
> > the necessary translations except for downloading a partial response. 
> > For example, there are cases where the server response may be very
> > large, but I'm only interested in the first 50K or so.  In HttpClient 3
> > I handled this with ContentLengthInputStream, which basically took an
> > InputStream and the number of bytes to be read.  Nice and easy.  In
> > HttpClient 4 it's probably equally easy, but I can't figure out just how
> > to go about it.  The new version of ContentLengthInputStream (found in
> > HttpComponents Core) takes a SessionInputBuffer, in addition to the
> > number of bytes to be read.  The trouble is, I can't figure out how to
> > generate a SessionInputBuffer out of an InputStream (or something like
> > it) that I might get from the response entity.  Any tips on how to go
> > about what I'm describing?
> > 
> 
> You could extend the AbstractSessionInputBuffer and make it work with
> any arbitrary input stream, but I think that would be an overkill if all
> you want is to limit the number of bytes readable from an input stream.
> 
> You will probably be much better off coping and customizing the old
> class from HttpClient 3.x
> 
> http://svn.apache.org/repos/asf/httpcomponents/oac.hc3x/trunk/src/java/org/apache/commons/httpclient/ContentLengthInputStream.java
> 
> You might also consider contributing it to Apache Commons IO. I was
> pretty surprised to not have found a similar class in Commons IO
> 
> Hope this helps
> 
> Oleg
> 
> 
> 
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