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From henry human <henry_hu...@yahoo.de>
Subject Re: access files from jsp
Date Tue, 29 Apr 2008 22:23:27 GMT
Thank you. I will look at the project.
--- David Fisher <dfisher@jmlafferty.com> schrieb:

> Well, it looks like you can use the reading the file
> part of my  
> approach or David Smith's approach.
> 
> If you need to retrieve content from within a
> Microsoft Office file -  
> including properties, etc then you might take a look
> the Apache POI  
> project - http://poi.apache.org/
> 
> If you need to do a transformation on a PDF - Apache
> XMLGraphics may  
> be worth a look - http://xmlgraphics.apache.org/
> 
> Regards,
> Dave
> 
> On Apr 29, 2008, at 4:48 PM, henry human wrote:
> 
> >
> >
> >
> > --- David Smith <dns4@cornell.edu> schrieb:
> >
> >> No, I don't mean that. It should be able to
> retrieve
> >> any type of file.
> >> What you can do with it from within a jsp might
> be
> >> somewhat limited thought.
> > Ok,
> >
> >> What exactly do you want to do with the file
> >> contents within the  jsp?
> >
> > I will save them to a Content Server by the JSPs.
> > I will use some beans and taglib for the logic
> > implementation.
> >
> >>
> >> BTW, I highly recommend you read the
> documentation
> >> for the jstl taglibs
> >> and do some googling. I'm sure some research
> would
> >> help you a lot.
> >>
> >> --David
> >>
> >> henry human wrote:
> >>> Hi David,
> >>> most of these files are PDF, XLS and not only
> TXT
> >>> format.
> >>> You are meaning that with a JSP definitvly one
> can
> >>> reads only TXT files?
> >>>
> >>> i understood with help of
> >>> --- David Fisher <dfisher@jmlafferty.com>
> schrieb:
> >>>
> >>>
> >>>> Henry doesn't say if these are text files or
> >> binary
> >>>> files.
> >>>>
> >>>> If these are binary files like PDF, PPT and XLS
> >>>> files then a servlet
> >>>> will be needed - not a jsp.
> >>>>
> >>>> We use variations like the following in both
> >> Tomcat
> >>>> 4.1.31 and Tomcat
> >>>> 5.5.26
> >>>>
> >>>> public class OpenFileServlet extends
> HttpServlet{
> >>>>
> >>>>     public void doGet (HttpServletRequest
> >> request,
> >>>>
> >>>> HttpServletResponse response) throws
> >>>> ServletException, IOException {
> >>>>
> >>>>         // You probably want to look up the url
> >> -
> >>>> which is really a
> >>>> path.
> >>>>         String url =
> >> request.getParameter("url");
> >>>>         if(url == null) return;
> >>>>
> >>>>         // You'll know your mime types for your
> >>>> content.
> >>>>         String ext =
> >> request.getParameter("ext");
> >>>>         String content_type;
> >>>>
> >>>>         if (".ppt".equals(ext)) {content_type =
> >>>> "application/vnd.ms-
> >>>> powerpoint"; }
> >>>>         else if (".xls".equals(ext))
> >> {content_type
> >>>> = "application/
> >>>> vnd.ms-excel"; }
> >>>>         else {content_type =
> "application/pdf";}
> >>>>
> >>>>         // we don't like to inline Office
> >>>> documents.
> >>>>         boolean is_inline =
> >>>> "application/pdf".equals(content_type);
> >>>>
> >>>>         File f = new File(url);
> >>>>
> >>>>         if ( f.exists() && f.length() > 0) {
> >>>>             response.setContentType(
> >> content_type);
> >>>>             // The following works way better
> in
> >>>> Windows IE than ext=
> >>>>
> >>>> response.setHeader("Content-disposition",
> >>>> (is_inline?"inline":"attachment")+";filename="
> +
> >>>> f.getName());
> >>>>             int lng = (int)f.length();
> >>>>             response.setContentLength( lng );
> >>>>             FileInputStream fis = new
> >>>> FileInputStream(f);
> >>>>             byte[] chunk = new byte[16184];
> >>>>             int count;
> >>>>             while ((count = fis.read(chunk))
> >=0
> >> )
> >>>> {
> >>>>
> >>>>
> response.getOutputStream().write(chunk,0,count);
> >>>>             }
> >>>>             fis.close();
> >>>>         } else {
> >>>>             log("File not found: " + url);
> >>>>         }
> >>>>     }
> >>>> }
> >>>>
> >>>>
> >>>>
> >>>> FYI - this approach really became necessary
> about
> >>>> when 4.1.29 came out
> >>>> - at that time Tomcat got pretty strict with
> >>>> non-Text being served via
> >>>> JSP. All of our PDF and PPT content broke in
> >> Windows
> >>>> IE. And we had to
> >>>> back out a whole release.
> >>>>
> >>>> Regards,
> >>>> Dave
> >>>>
> >>>> On Apr 29, 2008, at 1:39 PM, David Smith wrote:
> >>>>
> >>>>
> >>>>> 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
> >>>>
> 
=== message truncated ===



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