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Actually I am downloading a pdf file to be displayed on the page for which I am using a servlet that uses the URL to download the pdf file.

After download is complete the pdf file is displayed in the jsp.

But as the download takes some time I want to display some custom message in another jsp until the download is going on and after the download of pdf is complete I will show the pdf file.

Is there any method of doing it?

Please suggest me something...It will be a great help to me.
Posted 1-Dec-11 4:21am

1 solution

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Solution 1


I suggest you to use observer and observable design patterns.
Your jsp page would be the Obsorvers.
Obervers should subsribe to the Observable objects to be fired when an defined event occurs.
Thread downloading the pdf File would be the Observable.
When the thread finish downloading it should fire it obervers so they could modify their display.

look at this article to have an idea about Observer design pattern :

Best regards.

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