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prado
Guest
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 Posted: Mon Jun 19, 2006 9:45 pm Post subject: Problem to download a file from 2 browsers at the time |
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I have this JSP that download an excel file.
It works fine if I use only one browser at the same time.
The problem is when I try to do this but from 2 browsers at the same
time. From each browser I can download a part of the file but not the
complete file.
It seems the browsers are sharing the bandwidth and when it starts to
download a file the other stops.
I have look the logs, and I saw the file has downloaded to the computer
and while the the jsp is working.
I don't undestand why the file has finished to download and while the
jsp is still executing.
Can you help me please?
do anybody try this JSP and tell me if the result is the same as me?
------------------------------------------JSP
-----------------------------------------------------------------------------------
<%@page contentType="application/vnd.ms-excel"%>
<%@ page language="java" import="java.io.*"%>
<%@ page language="java" import="java.util.*"%>
<%
Date fecha = new Date();
java.sql.Date fechaSQL = new java.sql.Date(fecha.getTime());
Calendar calendario = Calendar.getInstance();
calendario.setTime(fecha); // fecha es el Date de antes.
String strHour = String.valueOf( calendario.get(Calendar.HOUR) );
String strMinute = String.valueOf( calendario.get(Calendar.MINUTE) );
String strSecond = String.valueOf( calendario.get(Calendar.SECOND) );
String nombre = "FILE" + strHour + strMinute + strSecond + ".xls";
System.out.println( " IN OF " + nombre );
response.setContentType( "application/x-download" );
response.setHeader("Content-type","application/vnd.ms-excel");
response.setHeader("Content-Disposition","attachment; filename=\""
+ nombre + "\"");
System.out.println( nombre + " START" );
for (int l=0;l<30000;l++){
System.out.println( nombre + " " + l );
for (int k=0;k<250;k++){
out.write(nombre + " : ("+ l + "," + k + ")" + "\t" );
}
out.write("\n");
}
System.out.println( nombre + " END" );
%> |
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prado
Guest
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| Posted: Tue Jun 20, 2006 2:31 pm Post subject: Re: Problem to download a file from 2 browsers at the time |
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Please, I need help with this problem.
Thanks. |
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jcsnippets.atspace.com
Guest
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| Posted: Wed Jun 21, 2006 2:02 am Post subject: Re: Problem to download a file from 2 browsers at the time |
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"prado" <bernadelpradoclaves (AT) yahoo (DOT) es> wrote in message
news:1150795899.876829.308990 (AT) i40g2000cwc (DOT) googlegroups.com...
| Quote: | Please, I need help with this problem.
|
First of all, don't think we ignore you if we don't reply - it's possible
that nobody has a clear answer for your problem, or nobody has encountered
this behaviour.
Second, have your tried the following (as I do not have a solution at the
moment):
- download with different browsers?
- download, wait until finished, download with other browser?
- experiment with browser cache settings?
You mentioned log files - which log files? What did you come up with?
Some time ago, I wrote a servlet which served up .csv files, reports
generated on a database. Should you need it, I'll try to dig it up again.
Best of luck,
JayCee
--
http://jcsnippets.atspace.com/
a collection of source code, tips and tricks |
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KiLVaiDeN
Guest
|
| Posted: Wed Jun 21, 2006 4:19 am Post subject: Re: Problem to download a file from 2 browsers at the time |
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prado wrote:
| Quote: | I have this JSP that download an excel file.
It works fine if I use only one browser at the same time.
The problem is when I try to do this but from 2 browsers at the same
time. From each browser I can download a part of the file but not the
complete file.
It seems the browsers are sharing the bandwidth and when it starts to
download a file the other stops.
I have look the logs, and I saw the file has downloaded to the computer
and while the the jsp is working.
I don't undestand why the file has finished to download and while the
jsp is still executing.
Can you help me please?
do anybody try this JSP and tell me if the result is the same as me?
------------------------------------------JSP
-----------------------------------------------------------------------------------
%@page contentType="application/vnd.ms-excel"%
%@ page language="java" import="java.io.*"%
%@ page language="java" import="java.util.*"%
%
Date fecha = new Date();
java.sql.Date fechaSQL = new java.sql.Date(fecha.getTime());
Calendar calendario = Calendar.getInstance();
calendario.setTime(fecha); // fecha es el Date de antes.
String strHour = String.valueOf( calendario.get(Calendar.HOUR) );
String strMinute = String.valueOf( calendario.get(Calendar.MINUTE) );
String strSecond = String.valueOf( calendario.get(Calendar.SECOND) );
String nombre = "FILE" + strHour + strMinute + strSecond + ".xls";
System.out.println( " IN OF " + nombre );
response.setContentType( "application/x-download" );
response.setHeader("Content-type","application/vnd.ms-excel");
response.setHeader("Content-Disposition","attachment; filename=\""
+ nombre + "\"");
System.out.println( nombre + " START" );
for (int l=0;l<30000;l++){
System.out.println( nombre + " " + l );
for (int k=0;k<250;k++){
out.write(nombre + " : ("+ l + "," + k + ")" + "\t" );
}
out.write("\n");
}
System.out.println( nombre + " END" );
%
|
Hi,
I think it's much more efficient to implement the file downloading
mechanism in a Servlet, I don't think it's a good idea to put that kind
of code in a JSP.
Then, I'm wondering about that code you posted. Is it really generating
a valid XLS file ? And where is your "download" script ?
I'd advice you to read this tutorial :
http://www.onjava.com/pub/a/onjava/excerpt/jebp_3/index1.html?page=1
I think it'll give you a good hint on how to make your download Servlet.
K |
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