At 10:06 AM +0800 2002/06/18, Daniel J. D'Cotta wrote:
>So can someone answer my 3 questions (without suggesting Expresso)?
>
>1. First, I have a concern for memory usage while uploading a huge (100+Mb)
>file. How does Struts handle uploading the file? Or is this purely a Web
>Server issue.
>
>Also, I am using the org.apache.struts.upload.FormFile class to read it.
>Does it matter if I use getInputStream() read batch-by-batch or
>getFileData()?
Note that FormFile is an interface, not a class, so you could
conceivably write a new implementation to address any performance
issues. Most folks just use "org.apache.struts.upload.DiskFile",
which is the default. To customize, you would actually implement
both MultipartRequestHandler and FormFile differently as necessary,
because you plug these in by specifying a "multipartClass" property
of your controller (in web.xml for Struts 1.0 and in the <controller>
element of your struts-config in 1.1). The multipart handler is what
creates objects of type "FormFile" to set those properties on your
FormBean.
The default implementation writes the file to disk, so memory
shouldn't be a problem. I've found the form upload stuff to be
extremely easy to implement, although I did it more by guesswork than
from documentation.
>2. Next, when I pre-set the value, it does not show in the input field.
>
> <input type="file" id="file" name="file" size="50" value="temp.txt"/>
>
>I read somewhere that that is a html thing. Any way to get around it?
Although "value" seems to be in the spec, I don't know of any
browsers that pay any attention to values you put there.
>3. Finally, How do you let users download a file with Struts? The file
>cannot be outside WEB-INF.
>
>(Could not find any documentation on this part, if you ask me to RTFM,
>please direct me to which part of the manual).
You'd need to write directly to the HttpServletResponse object and
return a null ActionMapping from the perform/execute method of your
Action. You're responsible for setting all the headers (content
type, etc). But this isn't hard to do -- it's just not something
that Struts helps you do.
Hope that helps,
Joe
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* Joe Germuska { [EMAIL PROTECTED] }
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