----------------------------------------------------------------
BEFORE YOU POST, search the faq at <http://java.apache.org/faq/>
WHEN YOU POST, include all relevant version numbers, log files,
and configuration files. Don't make us guess your problem!!!
----------------------------------------------------------------
I have a working servlet that output little chunks of html while a long
query is happening; I know it works, I can see the packets going
back to the browser with tcpdump. Possibly you could post some
sample code that doesn't work?
Here's a servlet snippet that does flush as it goes (prints a line
every second). This works on JServ 1.2 JDK 1.2.2 Solaris 2.7 apache 1.3.12:
PrintWriter out = null;
Vector args = getPathInfoArgs(req);
int sleepMS = 1000;
if (args.size() > 0) {
String sleepTime = (String)args.elementAt(0);
sleepMS = Integer.parseInt(sleepTime);
}
res.setContentType("text/plain");
out = new PrintWriter(res.getOutputStream());
int count = 30;
try {
while (count-- > 0) {
Thread.sleep(sleepMS);
out.println("Slept for " + sleepMS + " ms.");
out.flush();
}
} catch (InterruptedException e) {
out.println("Interrupted!");
}
out.close();
good luck.
billo
From: Martin Naskovski <[EMAIL PROTECTED]>
Date: Wed, 18 Oct 2000 16:22:22 -0700
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BEFORE YOU POST, search the faq at <http://java.apache.org/faq/>
WHEN YOU POST, include all relevant version numbers, log files,
and configuration files. Don't make us guess your problem!!!
----------------------------------------------------------------
And I would like to add that I do properly close() the output stream at the
end of the doPost/doGet, and at that time I do get output, provided the
browser hasnt timed out on me, however, that is not what I want. I would
like to FLUSH midway in doPost and be able to see the results up to that
point, or not even the results, I just want the TITLE of the page
displayed. And out.flush() does not cut the mustard for this particular
purpose.
Please help.
Thank you in advance,
Martin
At 04:04 PM 10/18/2000 -0700, Martin Naskovski wrote:
>----------------------------------------------------------------
>BEFORE YOU POST, search the faq at <http://java.apache.org/faq/>
>WHEN YOU POST, include all relevant version numbers, log files,
>and configuration files. Don't make us guess your problem!!!
>----------------------------------------------------------------
>
>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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