Re: SISCweb & File Upload

Gerardo,

You're right, I had forgotten that in J2EE the
HttpServletRequest.getParameter*() methods don't handle multipart
requests.

The FileUtil library however allows you to read that information with
the readHeaders() call. It's a bit clunky, with Iterators and the
such, but consider that:

1) The (get-bindings) procedure returns a plain Java Map as per [1].
This is not ever going to change.

2) You can implement your (get-bindings/multipart) procedure either as
a wrapper around some Java code that extracts a parameter Map from the
FileUpload MultiPartstream, or directly, and somewhat naturally, using
the (iterator/for-each) procedures in the util/misc module. [2]

Sorry this couldn't be any simpler.
___
Alessandro

[1] http://java.sun.com/j2ee/1.4/docs/api/javax/servlet/ServletRequest.html#getParameterMap()

[2] http://siscweb.cvs.sourceforge.net/siscweb/siscweb/scm/util/misc.scm?revision=1.4&view=markup&pathrev=rel-0-6-dev





On Mon, Jul 21, 2008 at 3:27 AM, Gerardo Horvilleur <[email protected]> wrote:
> I've been doing a few tests and I have a problem. In order to be able
> to upload files y must declare the form's enctype to be
> multipart/form-data:
>
> (form (@ (action ,k-url) (enctype multipart/form-data)) ...
>
> But, once I do this, get-bindings isn't able anymore to extract the
> bindings from the request object. It just returns an empty map.
>
> On Sun, Jul 20, 2008 at 11:16 PM, Alessandro Colomba <[email protected]> wrote:
>> Gerardo,
>>
>> The request object returned by the some of the send-*/* procedures is
>> the actual HttpServletResponset object. You can most certainly place
>> more than one call to it.
>>
>> The response object is also always available through the
>> (current-response) procedure in the siscweb/response module. [*] So
>> your file upload module does not technically need to be passed the
>> response object, and you can keep the (get-bindings) call n place.
>>
>> Hope this helps,
>> ___
>> Alessandro
>>
>> [*] http://siscweb.sourceforge.net/swm/ch08.html#response
>>
>>
>>
>> On Sun, Jul 20, 2008 at 1:38 AM, Gerardo Horvilleur <[email protected]> wrote:
>>> The Apache Commons File Upload library is what I have used in other
>>> projects written in Java.
>>>
>>> So, it looks like I''ll have to do something like
>>>
>>> (let ((request (send-thml/suspend ...
>>>
>>> instead of doing
>>>
>>> (let ((bindings (get-bindings (send-html/suspend ...
>>>
>>> so I can give the request to the file upload library to extract the data.
>>>
>>> What I don't know is if, after I've used the request object with the
>>> file upload library, I still can do a a
>>>
>>> (let ((bindings (get-bindings request))) ...
>>>
>>> To extract the values for the parameters which are not file uploads.
>>>
>>> All the pages in which I need to support file uploads also have many
>>> other fields, and I would like to still be able to use get-bindings to
>>> handle them.
>>>
>>> On Sat, Jul 19, 2008 at 8:31 PM, Alessandro Colomba <[email protected]> wrote:
>>>> Gerardo,
>>>>
>>>> Unfortunately file uploads in J2EE are best handled through
>>>> third-party libraries, and I really did not want to tie SISCweb to
>>>> one. Apache Commons has a pretty good library (FileUpload), and I
>>>> wouldn't imagine difficult to write a Scheme wrapper around it.
>>>>
>>>> Should you decide to go this route, and encounter any obstacles in
>>>> SISCweb, please let me know. I'll be glad to clear them out.
>>>>
>>>> Regards,
>>>> ___
>>>> Alessandro
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> On Sat, Jul 19, 2008 at 6:14 PM, Gerardo Horvilleur <[email protected]> wrote:
>>>>> For the application I'm writing, I need to let the user upload images
>>>>> to the server. I haven't found any straightforward way to handle file
>>>>> uploads in SISCweb. Has anybody already written some code to handle
>>>>> this?
>>>>>
>>>>> --
>>>>> Gerardo Horvilleur
>>>>> [email protected]
>>>>> 5813-0830
>>>>>
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>>>>>
>>>>
>>>
>>>
>>>
>>> --
>>> Gerardo Horvilleur
>>> [email protected]
>>> 5813-0830
>>>
>>
>
>
>
> --
> Gerardo Horvilleur
> [email protected]
> 5813-0830
>

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