Re: Migrating fileUpload

Mark,

On 12/15/25 3:11 AM, Mark Foley wrote:
> I found a solution:
> 
> Part fileUpload = request.getPart("newFile");
> contentType = fileUpload.getContentType();
> 
> This gives me the string values as expected: "image/jpeg", "image/gif", "image/png", etc.

Be aware that the client can lie to you.

-chris

> -----Original Message-----
> Date: Sun, 14 Dec 2025 21:55:51 -0500
> Organization: Novatec Software Engineering, LLC
> To: [email protected]
> Subject: Migrating fileUpload
> From: Mark Foley <[email protected]>
> 
> I'm still in the process of migrating my tomcat 8.5.11 to 10.1.13. So for so
> good with the help of Christopher Schultz and others on this list. Thanks.
> 
> My next challenge is migrating the 8.5 apps using org.apache.commons.fileupload
> to jakarta.servlet.annotation.MultipartConfig.
> 
> I've got it partially working. One problem is determining the content type of
> the uploaded file. In my code I have:
> 
>      Part fileUpload = request.getPart("newFile");
> 
>      if (fileUpload != null)
>      {
>          fileUpload.write("boogaPhoto");
>          Path filePath = Paths.get("/tmp/boogaPhoto");
>          contentType = Files.probeContentType(filePath);
> 	:
> 
> The problem is that the content type comes back null. But ...
> 
> $ file /tmp/boogaPhoto
> /tmp/boogaPhoto: JPEG image data, JFIF standard 1.02, resolution (DPI), density 72x72, segment length 16, baseline, precision 8, 186x253, components 3
> 
> The old:
> 
>      contentType = (fileItem).getContentType();
> 
>      if (contentType.compareToIgnoreCase("image/jpeg") == 0) suffix = ".jpg";
>      else if (contentType.compareToIgnoreCase("image/gif") == 0) suffix = ".gif";
>      else if (contentType.compareToIgnoreCase("image/png") == 0) suffix = ".png";
>   
> did return a usable content type.
> 
> How do I do this with "new" java.nio.file classes ... or is there a better way?
> 
> Thanks --Mark
> 
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