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Editorial Team
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Asked: 2026-05-27T04:49:49+00:00

I’m writing a program that will be hosted on GAE that can upload and

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I’m writing a program that will be hosted on GAE that can upload and process local files. The program needs to process the file on the server side, and then return it to the client side. Previously I used JFileChooser for that purpose, but found out that it’s not supported in GAE. I did some research and found FileUpload class, but it seems like it can’t return the data to the client side. I could just let the user type the path of the file, but that would be just bad usability.

Any ideas are appreciated! Thanks.

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1 Answer

  1. Editorial Team

    GAE may not support JFileChooser directly, but it is apparently possible to embed applets.

    Since that is the case:

    1. A digitally signed and trusted applet can show a JFileChooser.
    2. A sand-boxed applet deployed in a Plug-In 2 architecture JRE (e.g. Sun’s 1.6.0_10+) can be launched using Java Web Start and use the services of the JNLP API. The JNLP API offers the FileContents object by way of the FileOpenService. Here is a small demo. of the file services of the API.
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