How to put the url path to the specific files in server using JSP?

I want to send the link which contains a path to the any file that is located in Server whenever user clicks the button. How can I do this in JSP?

For example, my file is stored in web-inf/temp0001111/JspContext.pdf.

So, whenever user click this link, then this file get downloaded in开发者_开发问答to browser and allow the user to save.and also need to specify the life time of this link is to only 3 days.

How can I achieve this?

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the path under WEB-INF is not publicly visible so user can't simply GET it, you need to write a custom servlet which serve your purpose