This means the doPost method in servletServletUser will be invoked.
However I could not find the code for method doPost in the servlet code you posted, only the doGet method.
Nonetheless you claim that the servlet code is being executed.
This means you have either supplied incomplete or erroneous information which makes it difficult for others to help you.
i want know how to show jsp page first after i insert different data to sample table
Which JSP page are you referring to? AddForm.jsp ?
How is this related to your claim that after the servlet method executes, you are seeing no data in the database?