import java.io.*;
import java.sql.*;
inport javax.sql.*;
import javax,servlet.http.*;
public class connection extends HttpServlet
{
  public void service(HttpServletRequest
req,HttpServletResponse res)throws ServletException,IOException
{
 Connection con=makeConnectionPool();
Statement st =con.createStatement();
  
----------reqular code as like as jdbc--------









}
public void Connection makeConnectionPool()
{
  Connection con=null;
  try
{
InitialContext ic =new InitialContext();
DataSource ds =(DataSource)ic.lookUp(" jndi logical Name in
 Application server");
 con=ds.getcConnection();
}catch(Exception e)
{
e.printStackTrace();
}
return con;
}



Note:-First u create logical name of jndi in application
server and refer this api javax.sql.*