RE: Tomcat sucks at receiving large messages

[Walker Chris <wa...@dc-link.co.uk>]

Hi,

I should have thought that as a general principle it's not a good idea to
try to store the response in a byte array.  I recently worked on a piece of
code that did just that (worse, actually, it then copied the array into a
String).  Sooner or later a really big upload will blow up the application.

Reading and writing a byte at a time (with appropriate buffering) requires a
bit more ingenuity, especially when you're searching for things like
boundary strings in the response, but it's the only way to remove any
constraint on upload size.  

Chris Walker

-----Original Message-----
From: Shapira, Yoav [mailto:Yoav.Shapira@mpi.com]
Sent: 30 September 2003 19:30
To: Tomcat Users List
Subject: RE: Tomcat sucks at receiving large messages



Howdy,

>public void service(HttpServletRequest req, HttpServletResponse res) {
>  BufferedReader reader = req.getReader();
>  try {
>    char [] charArr = new char[req.getContentLength()];
>    reader.read(charArr);
>    String str = new String(charArr);
>
>    try {
>      File f = new File("servlet.out");
>      PrintWriter out = new PrintWriter(new FileWriter(f));
>      out.print(str);
>      out.flush();
>      out.close();
>    } catch(IOException err { System.err.println(err.toString()); }
>
>  } catch(IOException err) { System.err.println(err.toString()); }
>}

What happens if you ditch the req.getContentLength() approach (there are
times when it will be -1 anyways), and do something like:
BufferedReader reader = req.getReader();
StringBuffer contents = new StringBuffer();
String line = null;
while((line = reader.readLine()) != null) {
  contents.append(line);
}

System.out.println(contents);

(Later we'll worry about the writing -- first make sure you're reading
the entire contents).

Yoav Shapira



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