Thumbnail/ Preview of document (.doc/ .pdf) getting uploaded jsp

I got a project of forms uploading for my college. Its my major project and the help I need is :

We have to upload forms provided my college in .pdf or .doc format. I have module of uploading the forms in JSP. My teacher wants to have a preview of the forms getting uploaded from the upload module. So that student can preview the form before downloading.

I want that whenever a form is uploaded an automatic preview is being generated, below which we will place a download button.

Hope I am clear with my question and someone will come up with some solution for this. Guys else I have to take screenshot of 400-500 forms and upload it will will take a lotttttt of time.

Thanks