Is it possible to validate the size of a file being uploaded from a JSP page on the client-side browser without requiring the user to upload the entire file first and then realizing it exceeds the size limit?
I prefer avoiding proprietary controls such as Flash or ActiveX, if there are any alternative solutions available.
Thank you!
One approach to handling large file transfers is to check the Content-Length HTTP header using
request.getHeader("Content-Length")Essentially, with very large files, you won't be transferring everything all at once. Instead, you'll need to open a stream that represents a portion of the POST data and read from it in chunks for the entire transfer to occur.
However, if your concern is about potential denial-of-service attacks, relying solely on the Content-Length header may not be sufficient, as it can be easily manipulated. In such cases, it's advisable to set a limit on the file size to be transferred and stream the transfer accordingly, halting once the limit is reached.
It would be wise to reconsider using Flash and instead explore the YUI Uploader option. You can find more information about it here:
http://developer.yahoo.com/yui/uploader/
One of the advantages of YUI Uploader is that it provides a fileSelect event that allows you to determine the size of the selected file in bytes before uploading, enabling you to set restrictions accordingly.
When working with JSP or PHP, limiting file size can be a challenge as the page does not receive the request until after the upload has already occurred. This means that by the time you have control over whether to save the file, it may be too late.
Fortunately, there are Java-based solutions available such as MyUploader and Hermes that offer features like multiple file uploads, resuming partial uploads, and access to source code. Alternatively, you can develop your own solution but it will require a signed applet in order to function properly due to the need to access the local filesystem. Keep in mind that if you are using Apache as your webserver, you will need sufficient RAM to accommodate the entire file sizes of all uploads simultaneously.
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