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From Laurie Harper <>
Subject Re: FormFile arrays
Date Tue, 12 Sep 2006 22:10:22 GMT
Jeremiah Johnson wrote:
> I would like to upload multiple files on a single web page by having 
> multiple <html:file> elements. The exact number of these are different 
> depending on the user who is using the application. So I want to store 
> this in an array (FormFile[]) in order to have N number of files 
> uploaded. When I try to use <html:file/> tags in an iterate loop (with 
> indexed="true") I get an error about requiring property attribute. 
> There's isn't a good way of doing that so I just rendered the the HTML 
> with scriplets. It looks something like:
> <input type="file" name="workingfile"/>
> <input type="file" name="notworkingfile[0]"/>
> <input type="file" name="notworkingfile[1]"/>
> <input type="file" name="notworkingfile[2]"/>

That should probably be name="notworkingfile(0)" -- i.e. parentheses 
instead of brackets.

> The form has getters and setters for workingfile (of type FormFile) and 
> notworkingfile ( of type FormFile[] that is 3 elements). workingfile is 
> assigned an instantied object however each element of notworkingfile[] 
> is null after submit.
> I then attempted to use commons-fileupload-1.1.1 in a struts action 
> (struts 1.2.9) to read the uploaded data but it does not recognize that 
> any files are being uploaded (including workingfile). I tried this code:
>            List items = new ServletFileUpload(
>                    new DiskFileItemFactory()).parseRequest(request);
> items results in an empty collection (but not null). I've read that you 
> can not use commons-fileupload in a struts action which may be why that 

No, that won't work since by the time commons-fileupload parses the 
request, it's already been read by Struts. As you've already discovered, 
Struts is handling the uploaded files for you -- you just need to get 
your form bean and property references straight so you can see them.

> doesn't work. Anyone know how to have variable number of file upload 
> boxes? I know I could have properties for each file (file1,file2,file3 
> and so on) instead of array but I'd rather not implement it that way. 

See the documentation on using indexed properties [1] for more details.



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