How do I force clients to cache files obtained from my servlets

I have a servlet that creates files.
I want to save my servlet from generating a file that a client already has, (ie get him to use caching).
I only want it to create a new file if any data has changed since last making it.
(I can easily generate a last modified date for the data within the file)
I know I have to use
myServletResponse.setContentType(java.lang.String type) but am unsure as to what exactly to put in the 'type' field.
I have read
http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
but am none the wiser as to the specific String needed

So I don't need to fill in any HTTP Responce headers,
I can just override the getLastModified() method?Don't take my word for it (because I haven't done it). Read the API documentation to see what it says, or try it.
How will the client beable to compare dates without a
date for the original?If this means "What happens the first time a client asks for a document?" then the answer is that it doesn't attempt to compare any dates. If it means something else, then try asking it in different words because I don't understand it.

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Message was edited by: Kevin Monahan
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If IO.File.Exists(Pholderbox.Text) = False Then
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' CLIENT
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Private Function ReadSettingsXML(ByVal path As String) As MySettings # On Debug It marks here and tells me it wasn't found.
Dim thisSettingsInfo As New MySettings
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Next
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End If
End Sub
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Been stuck on this for two working days, so any help is highly appreciated
Codesamples are also highly welcome so I can see what the heck you did and find and answer to my problems.

I found a code that might be close to what I'm looking, but as of this code used here, it looks for a static document that already exist and is located in the code.
See this one here, checks for the XML file, and since I can't link one program to 1 file, when its gonna have and use 100's of files.
If (IO.File.Exists("MyXML.xml")) Then
Same here with the static document.
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I have to extend, debug and adapt an e-mail archive for my company.
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Hi there,
Thanks for your reply.
Well, it was kind of a mistake in the webapplication itself. The object passed to the related method was an instance of MimeMessage (the previous programmer only checked MimeMultiParts), and those weren't added to the vector of attachments. Now they are.
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morrisck wrote:
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How do I force clients to cache files obtained from my servlets

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