puspa

package pkg;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class Login
 */
@WebServlet("/Login")
public class Login extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * Default constructor.
     */
    public Login() {
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub

        request.setAttribute("wrong_password", "hidden");
        request.setAttribute("wrong_email", "hidden");

        request.getRequestDispatcher("login.jsp").include(request, response);

    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub

        ServletContext context=getServletContext();

        response.setContentType("text/html");
        PrintWriter pw = response.getWriter();


        String email = request.getParameter("email");
        String password= request.getParameter("password");

        System.out.println(email + " " + password);

        try {

            Connection con;

            Class.forName("com.mysql.cj.jdbc.Driver");
            con = DriverManager.getConnection("jdbc:mysql://localhost:3306/exam", "root", "abcd");

            PreparedStatement pstm;

            pstm = con.prepareStatement("select email, password, name from user_table where email = ?");
            pstm.setString(1, email);

            ResultSet rs = pstm.executeQuery();

            if(rs.next())
            {
                if(rs.getString("password").equals(password))
                {
                    System.out.println("Pwd correct");

                    pw.println("<h1>Welcome </h1>" + rs.getString("name"));
                }
                else
                {
                    System.out.println("Pwd incorrect");
                    request.setAttribute("wrong_email", "hidden");
                    request.getRequestDispatcher("login.jsp").include(request, response);

                }

            }

            else
            {
                System.out.println("Email dosen't exist");
                request.setAttribute("wrong_password", "hidden");
                request.getRequestDispatcher("login.jsp").include(request, response);
            }


        }catch(Exception e) {System.out.println(e);}
    }

}