test

package controller;

import java.sql.*;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.Resource;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.sql.DataSource;

@WebServlet(name = "AddBookServlet", urlPatterns = {"/addBook.do"})
public class AddBookServlet extends HttpServlet {

    @Resource(name = "test")
    private DataSource test;

    private Connection conn;

    public void init() {
        try {
            conn = test.getConnection();
        } catch (Exception ex) {
            System.out.println(ex);
        }
    }

    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        try (PrintWriter out = response.getWriter()) {
            String isbn = request.getParameter("isbn");
            String author = request.getParameter("author");
            String title = request.getParameter("title");
            String price = request.getParameter("price");

            //----------------------------------------------------------------//

            Statement stmt = null;
            try {
                stmt = conn.createStatement();
            } catch (SQLException ex) {
                Logger.getLogger(AddBookServlet.class.getName()).log(Level.SEVERE, null, ex);
            }
            String sql = "INSERT INTO books VALUES('" + isbn + "','" + title + "','" + author + "'," + price + ")";            //int numRow = stmt.executeUpdate(sql);

            //----------------------------------------------------------------//

            int numRow = 0;
            try {
                numRow = stmt.executeUpdate(sql);
            } catch (SQLException ex) {
                Logger.getLogger(AddBookServlet.class.getName()).log(Level.SEVERE, null, ex);
            }

            //----------------------------------------------------------------//

            RequestDispatcher obj = request.getRequestDispatcher("thankyou.html");
            if (numRow == 1 && obj != null) {
                obj.forward(request, response);
            }
        }
    }

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}