bookUtilities.BookInfoServlet.java Source code

Introduction

Here is the source code for bookUtilities.BookInfoServlet.java

Source

/*
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 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package bookUtilities;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
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 org.json.simple.JSONObject;

/**
 *
 * @author Ryan Hothan
 */
@WebServlet(name = "BookInfoServlet", urlPatterns = { "/BookInfoServlet" })
public class BookInfoServlet extends HttpServlet {

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        JSONObject book = getBookInfo(request.getParameter("bookId"));
        PrintWriter printout = response.getWriter();
        printout.print(book);
        printout.flush();
    }

    private JSONObject getBookInfo(String bookId) {
        JSONObject ourBook = new JSONObject();
        try {
            Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

            Connection con = DriverManager.getConnection("jdbc:sqlserver://localhost;user=sa;password=nopw");

            Statement st = con.createStatement();
            Statement st2 = con.createStatement();
            Statement st3 = con.createStatement();
            String query = "SELECT * " + "FROM [HardCover].[dbo].[Book] " + "WHERE BookUuid = '" + bookId
                    + "' AND Active = 1;";

            String query2 = "SELECT AuthorName " + "FROM [HardCover].[dbo].[Author] " + "WHERE BookId = '" + bookId
                    + "';";

            String query3 = "SELECT Genre " + "FROM [HardCover].[dbo].[Genre] " + "WHERE BookId = '" + bookId
                    + "';";

            ResultSet rs = st.executeQuery(query);
            ResultSet rs2 = st2.executeQuery(query2);
            ResultSet rs3 = st3.executeQuery(query3);

            rs.next();
            String authors = "";
            while (rs2.next()) {
                if (authors.isEmpty()) {
                    authors = rs2.getString("AuthorName");
                } else {
                    authors = authors + ", " + rs2.getString("AuthorName");
                }
            }
            String genres = "";
            while (rs3.next()) {
                if (genres.isEmpty()) {
                    genres = rs3.getString("Genre");
                } else {
                    genres = genres + ", " + rs3.getString("Genre");
                }
            }
            ourBook.put("authors", authors);
            ourBook.put("genres", genres);
            ourBook.put("title", rs.getString("Title"));
            ourBook.put("description", rs.getString("BookDescription"));
            ourBook.put("cover", rs.getString("Cover"));
            ourBook.put("numCopies", rs.getString("NumCopies"));
            ourBook.put("language", rs.getString("BookLanguage"));
            ourBook.put("publisher", rs.getString("Publisher"));
        } catch (Exception e) {
            System.out.println(e.getMessage());
        }

        return ourBook;
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">

    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}