Re: Cross Platform/Browser way to send PNG file to Webserver

From:
Lew <noone@lewscanon.com>
Newsgroups:
comp.lang.javascript,comp.lang.java.programmer
Date:
Wed, 17 Mar 2010 23:57:07 -0400
Message-ID:
<hns8aj$j3c$1@news.albasani.net>
Peter Olcott wrote:

"Roedy Green" <see_website@mindprod.com.invalid> wrote in
message news:opl2q5ltgv3uom5lpt6ngmo4c74u410ll8@4ax.com...

On Wed, 17 Mar 2010 12:25:36 -0500, "Peter Olcott"
<NoSpam@OCR4Screen.com> wrote, quoted or indirectly quoted
someone who
said :

Would it run on the client side and work across most every
browser?
Could it be invoked from a BrowseForFile Button on my
web-page that filters for PNG files?
One more thing, I need it to send the file over HTTP.

Look at the client side HTML on any forum that lets you
select a local
image for upload. You use <input type="file" and
accept="list of
acceptable mime types".


The documentation that I have seen says that this is not
supported. I tried it and it did not use the accept list.


I've written serlvet/JSP-based apps that do HTML file uploads, with the Apache
Commons FileUpload project
<http://commons.apache.org/fileupload/>
that in turn relies on the Apache Commons IO project
<http://commons.apache.org/io/>,
on the server side.

In the world of Java Server Faces, Tomahawk
<http://myfaces.apache.org/tomahawk/index.html>
has a tag that wraps an HTML file input,
<http://myfaces.apache.org/tomahawk-project/tomahawk12/tagdoc/t_inputFileUpload.html>

As the Tomahawk documentation there reminds you,

don't forget to set the form's attribute "enctype"
to "multipart/form-data".
See "examples/web/fileupload.jsp" for an example!


This is an HTML matter; when you do an HTML '<input type="file" ... />' you
have to change the type of the enclosing form. That makes parsing the form on
the server side a little harder, but those Apache Commons libraries take all
the sting out of it.

--
Lew

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