Calling HTML file from servlet and vice versa...

i have got few questions..
1- if a site is made in HTML then what should be used to put user login functionality in it, servlets or jsp or other option(specify)?
2- im trying to do with servlets, so when im calling doPost method from HTML page and sending data, everything working fine but because of this the page refreshes and the HTML coding get lost, so how can i stop that from happening if possible, like showing the same page with messege = "Logged in".
3- how can i call an HTML page from servlet?
4- how can i send data from servlet to HTML page?

that i m aware of, but when a servlet is called then the page will refresh n it will display the things that you have mentioned in the servlet file n not the things that u have mentioned in HTML file, n the page will be blank if u have not mentioned any HTML coding in servlet file.
so i need to knw how to call back that prev HTML file so that the things i want to display can be displayed, i knw the same can be done by adding the HTML code in servlet file but i would like to know if there is any way to call back the HTML file.

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Calling HTML file from servlet and vice versa...

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