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From "Tim Lucia" <timlu...@yahoo.com>
Subject RE: Commons fileUpload: write to disk permission problem
Date Mon, 26 Jun 2006 15:08:32 GMT
The servlet looks OK -- I didn't compile or run it or anything.  When you
say a blank image -- are you requesting the servlet URL directly from the
browser?  I'd snoop on the headers and see what comes back.  It sounds like
it got a 404 or some other error.

1. Check http://your-host/path/.../servlet?ID=n with a browser -- check the
headers (TamperData, etc. for FireFox)
2. Check the Tomcat logs for a 40x or 50x error
3. Check the path in the .jsp <img.../> tag and make sure it matches the
path for #1.

HTH,
Tim


> -----Original Message-----
> From: Andrea Salvi [mailto:tudhalyas@gmail.com]
> Sent: Monday, June 26, 2006 8:31 AM
> To: Tomcat Users List
> Subject: Re: Commons fileUpload: write to disk permission problem
> 
> Hi Tim, and thanks for your answer. I did as you said and I made a servlet
> that handles the users' avatars, but all I can get from the servlet is a
> blank image. Here's the servlet code:
> 
> ---------BEGIN OF FILE---------
> 
> package servlet;
> 
> import java.io.IOException;
> 
> import javax.servlet.ServletException;
> import javax.servlet.ServletOutputStream;
> import javax.servlet.http.HttpServletRequest;
> import javax.servlet.http.HttpServletResponse;
> import javax.servlet.http.HttpSession;
> 
> import data.UserInfoBean; // class that holds infos about the user,
> including its avatar
> 
> public class ShowAvatarServlet extends
> javax.servlet.http.HttpServletimplements
>         javax.servlet.Servlet {
> 
>     public ShowAvatarServlet() {
>         super();
>     }
> 
>     protected void doPost(HttpServletRequest request,
>             HttpServletResponse response) throws ServletException,
> IOException {
>         HttpSession session = request.getSession();
>         UserInfoBean userInfo = (UserInfoBean) session.getAttribute
> ("userInfo");
> 
>         String format = infoUtente.getAvatarType();
>         //format can be image/jpeg, image/gif or image/x-png
> 
>         byte[] image = infoUtente.getAvatar();
>         response.setContentType(format);
>         ServletOutputStream outputStream = response.getOutputStream();
>         outputStream.write(image);
>         outputStream.close();
>     }
> 
>     protected void doGet(HttpServletRequest request,
>             HttpServletResponse response) throws ServletException,
> IOException {
>         this.doPost(request, response);
>     }
> 
> }
> 
> -----END OF FILE-------
> 
> Am I doing something wrong? Thanks for your help!
> 
> Andrea
> 
> 2006/6/26, Tim Lucia <timlucia@yahoo.com>:
> >
> > One way is to send back a reference to a servlet that knows how to
> > retrieve
> > the image.  I.e., in your .jsp, say:
> >
> > <img src="/path/to/avatar/servlet?avatar=1234"/>
> >
> > Where 1234 is the primary key (ID) field of the avatar in the DB.  Have
> > the
> > servlet set the response type to image/jpeg or image/png or whatever is
> > appropriate, and then stream the bytes out of the blob from the DB.
> >
> > Tim
> >
> >
> > > -----Original Message-----
> > > From: Andrea Salvi [mailto:tudhalyas@gmail.com]
> > > Sent: Monday, June 26, 2006 4:48 AM
> > > To: Tomcat Users List
> > > Subject: Re: Commons fileUpload: write to disk permission problem
> > >
> > > Hi David and thanks for the quick reply. I'll try to use the database
> to
> > > store the avatars but... I don't know how I can show those images in
> my
> > > JSP
> > > pages :S Can you please tell me how to do that? Sorry for the noobie
> > > question... :)
> > >
> > > Andrea
> > >
> > >
> > >
> > > 2006/6/26, David Delbecq <delbd@oma.be>:
> > > >
> > > > Do not write data in the webapplication folder, this folder is
> > supposed
> > > > to be overwritten when webapplication is redeployed and datas will
> be
> > > > lost. Instead choose a folder in system you dedicate to your
> > > > webapplication datas and store your avatars there.
> > > >
> > > > Or best .... use a database :)
> > > >
> > > > Andrea Salvi wrote:
> > > > > Hi there!
> > > > > I'm making a forum application with JSP and Servlets, and I wanted
> > to
> > > > > give
> > > > > to the final user the opportunity to upload an avatar to be
> > displayed
> > > > > into
> > > > > his posts. I found the Commons fileUpload library and it works
> quite
> > > > > well,
> > > > > except for a thing: I can't save the image on the server's file
> > > system,
> > > > > apparently due to a permission problem (as my program tries to
> write
> > > > > in any
> > > > > folder inside the web application context, Tomcat throws a
> > > > > FileNotFoundException, saying that access to that folder is
> denied).
> > > > > Can you
> > > > > tell me how can I fix this problem?
> > > > >
> > > > > Regards,
> > > > > Andrea
> > > > >
> > > >
> > > >
> > > > --------------------------------------------------------------------
> -
> > > > To start a new topic, e-mail: users@tomcat.apache.org
> > > > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > > > For additional commands, e-mail: users-help@tomcat.apache.org
> > > >
> > > >
> >
> >
> > ---------------------------------------------------------------------
> > To start a new topic, e-mail: users@tomcat.apache.org
> > To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> > For additional commands, e-mail: users-help@tomcat.apache.org
> >
> >


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