Checkin for a specific username and password

Question

i have an html page where i enter username and password..now if i want that for a specific username and password only the next page say next.html is displayed otherwise the same page is diaplayed sayin that the usrename and password is to be reenterd...how can i do this servlets..also do tell me where to store the username and password

Answer 1

I am sorry, I lost some code in cut and pasting it
import java.io.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;   
public class LoginServlet extends HttpServlet{
        private Connection con;
        private PreparedStatement pstmt;
        private Statement stmt;
        private ResultSet rs;
        private String pass = "";
        private String login,password,done;
        private HttpSession session;
        public void doPost(HttpServletRequest request,HttpServletResponse response)
        throws ServletException, IOException{
                login = ""+request.getParameter("login");
                password = ""+request.getParameter("password");
                done = ""+request.getParameter("done");
                session = request.getSession(true);
                PrintWriter out = response.getWriter();
                try{
                        Class.forName("oracle.jdbc.driver.OracleDriver");
                }catch(Exception e){
                        out.println(e.getMessage());
                try{
                        con = DriverManager.getConnection("jdbc:oracle:thin:scott/[email protected]:1521:csapw");
                        if(!(password.equals("")&&login.equals(""))){
                                pstmt = con.prepareStatement("select password from logon where login = ?");
                                pstmt.setString(1,login);
                                rs = pstmt.executeQuery();
                                                     pass = "";
                                while(rs.next()){
                                        pass = rs.getString(1);
                                if(pass.equals(password)){
                                        session.setAttribute("login",login);
                                        if(done.equals("null")){
                                                done = "";
                                                pass = "";
                                                response.sendRedirect("/ksenji/quiz2/shoponline.jsp");
                                        }else{
                                                response.sendRedirect(done.substring(5));
                                else{
                                        response.sendRedirect("/ksenji/quiz2/login.jsp?"+done);
                        else{
                                response.sendRedirect("/ksenji/quiz2/login.jsp?"+done);
                }catch(SQLException ex){
                        out.println(ex.getMessage());