how to validate the email login

// JavaScript Document

JOIN US

First Name
Last Name
Email
Contact No
Address
City

new.jsp <%@page import="java.sql.,java.util."%>

<% String fname=request.getParameter("fname"); String lname=request.getParameter("lname"); String email=request.getParameter("email"); String phone=request.getParameter("contactNo"); String address=request.getParameter("address"); String city=request.getParameter("city"); try{ Class.forName("oracle.jdbc.driver.OracleDriver"); Connection con = DriverManager.getConnection("jdbc:oracle:thin://localhost:1521:XE", "system", "root"); Statement st=con.createStatement(); int i=st.executeUpdate("insert into login(firstname,lastname,email,contactNo,address,city) values('"+fname+"','"+lname+"','"+email+"','"+phone+"','"+address+"','"+city+"')"); out.println("Data is successfully inserted!"); } catch(Exception e){ System.out.print(e); e.printStackTrace(); } %>