modify the index.jsp.
modify the login.jsp.
modify the UserServlet.java.
modify the UserService.java.
modify the checkPwd.jsp.
update password
modify the UserService/userLogin().
modify the index.jsp.
modify the checkPwd.jsp.
modify the UserServlet.java.
modify the UserService.
modify the Constants.java.
modify the add.jsp.
modify the css.
modify the ProductServlet.java.
modify the ProductDao.java.
modify the Product.java.
modify the ProductService.java.