> out.write(html.getBytes());
> makes this code MUCH faster. Specifically, I observed
I forgot some important things:
Some OutputStream implementations overload OutputStream instead of
FilterOutputStream.
FilterOutputStream does much the same thing as my
LowImpedanceStream.
When you examine implementations of OutputStream you will see that
methods like:
public void write(byte[] b,int start,int length)
are implemented by calling:
this.write(int)
with each byte.
You can tell that this is how it's done by looking at the JavaDoc -
the OutputStream class has only one abstract method from outputing
data - write(int); therefore all the other methods must be implemented
in terms of that.
You will note that ServletOutputStream extends OutputStream and thus
recieves the poor implementaton of the bulk output methods.
Thus unless a servlet container provides an implementation of
ServletOutputStream which overloads the bulk output methods of
OutputStream the implementation will always be slow.
One last important thing. The original post was prompted by a
question involving writing Strings to the output.
Don't use the getOutputStream() in this circumstance - use the
getWriter().
getWriter() returns a PrintWriter which has better performance
printing Strings. Check the JavaDoc to see if you can work out why.
PrintWriter *can* also handle different character-encodings. If your
servlet container is clever it might setup the correct encoding for
you.
Right - I'll shut up about that now. Sorry for the slightly off-topic
nature.
Nic Ferrier
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