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I have a problem flushing a servlet's output with out.flush(). Using
out.flush() does not really do anything for me. Here's why -
when the servlet's initially loaded (in IE5.5), it is loaded by calling GET
(doGet method) (of course). On that screen, I have a <FORM..., which is
then POST-ed to the same servlet, and doPost is supposed to take over the
input data from the user for further processing.
Once the user hits the "Submit" button on the initial (GET) page, and the
servlet enters the doPost method, I run a really long MySQL query (about 4
minutes) and by the time the query is done, my browser (IE 5.5) has timed
out and the connection between the browser and the servlet is lost. Thusly,
the user never sees the result set output in spite of the successfull
completion of the mysql query.
My question(s):
- is there a way to keep the connection, once the user hits "Submit" and
the servlet is in the doPost already, alive for an indefinite period of
time? If yes, how is this done, through meta html headers, browser
settings, apache jserv settings or what?
or
- is there a way to _force_ a flush once in the doPost() method? I do
out.flush() _SEVERAL_ times in my doPost, but to no avail :(. It just
won't flush until the very end of the query, apparently right around the
time out.close() gets called. How is one supposed to be able to flush
absolutely then? Should I use some other setContentType param, not
"text/html"? Maybe some multipart mime type? What do I nede to do to truly
force a flush while the 'globe's spinning' :), that is, my connection is
still open? After hitting submit, the connection is still open, waiting
for output from the servlet, and INDEED there is output, but it's not
flushed! Why??? Anyone an expert on jserv?
- I've heard of using the "Refresh" meta header tag, but won't that
re-issue another GET to the servlet and basically screw everything up ?
Has anyone been in a similar situation with servlets? I'm a little
confused about how the flush works.
We run JSDK2.0, and
Can someone with more expertise please clairfy? I've also read the FAQ on
this, but not much help there ("just run out.flush()").
Thank you.
Martin
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