How to make webpages fresh?

my webpage is dynamiclly(jsp page), but computer will save the file to temp folder, and when the user access the page, it will not show fresh data to user, except the user click "refresh" button.
how do I make it real dynamic? whenever user access the page, the data will be fresh, no need to click "refresh" button.
thanks!

Put this at the top of your JSP page, or put this in a .jsp file, and include it in the JSP you do not want cached.
response.setHeader("Cache-Control","no-cache,no-store");
response.setHeader("Pragma","no-cache");
response.setDateHeader("Expires",0);

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