Servlet download file

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Software Engineering. Web Technology. Cyber Security. C Programming. Control System. Data Mining. We can decide the size based on the amount of memory is reasonable to allocate for passing the data from the InputStream to the OutputStream ; the smaller the nuber, the more loops; the bigger the number, the higher memory usage. Stream instances must be closed after use to release any resources it is currently holding. Writer instances must also be flushed to write any remaining buffered bytes to it's destination.

Using a try-with-resources statement, the application will automatically close any AutoCloseable instance defined as part of the try statement. Read more about try-with-resources here. We use these two methods to release memory, ensuring that the data we have prepared is sent out from our application. Downloading a file from a Servlet becomes a simple process. Using streams allow us to pass out the data as bytes and the Media Types inform the client browser what type of data to expect. It is down to the browser to determine how to handle the response, however, we can give some guidelines with the Content-Disposition header.

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