Re: GWT File Download

AFAIK, you can't invoke browser download dialog with response from
ajax request.
One way to invoke browser download dialog is setting URL of an iframe.

You can do following to implement file download with GWT.
1) Write a download servlet which writes byte[] to servlet output
stream. And map it to say /download.do
2) Create an hidden IFrame
2) Construct URL on GWT Client side which points to /download.do with
required parameters.
3) On click of GWT Button, set URL of the hidden IFrame with
constructed URL.

This should invoke download dialog of browser.

Regards

On Sep 21, 1:52 pm, meetmrdeepak <meetmrdee...@gmail.com> wrote:
> Hi,
>
> I have to integrate file download into my GWT application.
>
> UseCase - User clicks on Export Button (gwt button), call will go to
> RPC servlet, RPC servlet will fetch data from database and convert the
> records in List<DTO> and this List will be passed to export Service to
> get Byte[].
>
> NOTE: I have a EXPORT service (spring service as separate-module/
> separate-jar), which accepts List<String> as column headers, and
> List<DTO> as records. This service generates excel, pdf, csv based on
> some parameter and rerturns byte[] along with other file information
> (file type, size etc).
>
> Problem 1: Even if i have byte[] in my RPC servlet, how can i trigger
> download file dialogue on client browser. since RPC servlet cannot
> write outputstream as normal servlet does.
> Problem 2: I cannot use RequestBuilder as it doesnt allows me to pass
> Object to another servlet. it can only pass string in form of GET
> request.
> Problem 3: I dont want to write servlets for each file download.
> Rather I would prefer to write single servlet, which will fetch byte[]
> from request attribute, and will write that byte[] to output stream.
>
> Please guide me in this direction.

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