So... the "remote file" is available to the local system on a network
drive. That's a fun one. There are a couple of different ways to do this.
1. Using Windows fileshares
Let me preface this by saying *I've* never done this. The few times I've
had a tomcat server on a Windows machine, it only ever accessed local
files. There are people on the list with way more experience than I have.
As I understand it, as long as tomcat is running under a user account
that has privileges to read the remote file, you could use a UNC path
with java standard file access classes and methods to read the file. The
mapped drive letter wouldn't work unless tomcat was only running while
you are logged in. In a jsp, this could be done with a scriptlet:
<!-- import your classes at the top of the jsp.... -->
<jsp:scriptlet>
try {
FileInputStream remoteFileReader = new FileInputStream(
"\\\\remoteServer\\archive\\files\\myFile.txt" ) ;
// do something with the file
} catch ( Exception e ) {
// do something if the access fails
} finally {
try {
remoteFileReader.close() ;
} catch ( Exception e ) {}
}
</jsp:scriptlet>
It should be mentioned the system account most services run under by
default does not have any privilege to access remote files via UNC path,
so you'll have to customize your tomcat installation a little. ... Or
always be logged into the system and have it running as you which isn't
the most ideal method.
2. Using a webserver on the remote system
This I have done and it's more platform independent. Your jsp can
request it from the remote server using standard taglibs:
(note standard.jar and jstl.jar must be in your webapp's WEB-INF/lib
directory)
<!-- import the core taglib from jstl at the top of the file. Docs for
the jstl taglib can help with this -->
<c:import url="http://remoteSystem.dns.com/http/path/to/file.txt";
var="fileContents" />
<!--.... Do something with the file contents, it'll be available in the
fileContents page context attribute.... -->
--David
henry human wrote:
Thanks David,
I try to clarify my situation.
I have a JSP running in local computer in tomcat. This
JSP should read from a remote machine. The files are
under d:\archive\files. These directory which provide
a repository functionality could not be transfer
somewhere else. The files “must be” saved there.
1) Scennario one: The remote machine does not hava e
webserver
2) Scenario two: a tomcat is running on remote
computer
My questions:
1) Do I need the webserver at all to access remotely
the files?
2) Is it poosile to access the data on d:\archive…
without to put them in a webserver directory or not?
If no, do I need configuration for the webserver (f.i.
tomcat)to allow access to the files from outside?
--- David Smith <[EMAIL PROTECTED]> schrieb:
Here's the picture you painted in the original email
and I based my
answer on:
1. You have a jsp file on a tomcat server which
needs to read
information from a remote system
2. The system containing the remote file has a
webserver you could put
the file in.
The c:import tag is a java standard tag library
(JSTL) tag used to
import data form locations outside the jsp. In this
case, I'm saying
you could request the file from the remote
webserver. Google is your
friend if you'd like more information.
If I've misunderstood your environment, please
provide a *lot* more
detail -- specifically more information regarding
the system the remote
file reside's on (does it have a web server?).
--David
henry human wrote:
Seems to me the simplest is the c:import tag and
sorry,I don't understand what you mean, could you
tell
more detailed. Maybe a little code code, a sample,
etc
fetch the file via http
how??
-- just my two cents. You know more about your
architecture and what's
available than any of us.
??
what
should be configured in tomcat ?
Do you mean that i do not need tomcat at all for
this
scenario?
I think it is not possible to read from the
hard disc directories f.i. d:\archive\files
without
helps of a web server ?
I am appreciated, if you get a sample, more
details!
--David
henry human wrote:
Once again because there was a mistake in the
first
email :
i am about to read from a JSP the data at a
remote computer. At remote computer is tomcat
running. the files are stored in
remote computer at
d:\archive\files
The port 80 is also accessible.
Please tell me, what should be
configured in tomcat to
be able to access the files
?
I am thankful for any hint
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David Smith
Network Operations Supervisor
Department of Entomology
Cornell University
2132 Comstock Hall
Ithaca, NY 14853
Phone: (607) 255-9571
Fax: (607) 255-0940
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