BookStoreServlet.java

 

 /*
  *
  * 
  */
 
 import java.io.*;
 import java.util.*;
 import javax.servlet.*;
 import javax.servlet.http.*;
 import database.*;
 import exception.*;
 /**
  * An HTTP Servlet that overrides the service method to return a
  * simple web page.
  */
 public class BookStoreServlet extends HttpServlet {
 
    private BookDB bookDB;
 
    public void init() throws ServletException {
       bookDB =
          (BookDB)getServletContext().getAttribute("bookDB");
       if (bookDB == null)
          throw new UnavailableException("Couldn't get database.");
    }
 
    public void destroy() {
       bookDB.remove();
       bookDB = null;
    }
 
       
    public void doGet (HttpServletRequest request,
                          HttpServletResponse response)
         throws ServletException, IOException {        
             
       HttpSession session = request.getSession();
       ResourceBundle messages = (ResourceBundle)session.getAttribute("messages");
       if (messages == null) {
          Locale locale=request.getLocale();
          messages = ResourceBundle.getBundle("messages.BookstoreMessages", locale); 
          session.setAttribute("messages", messages);
       }
       
       
       // set content-type header before accessing the Writer
         response.setContentType("text/html");
             response.setBufferSize(8192);
             PrintWriter out = response.getWriter();
         
         // then write the data of the response
         out.println("<html>" +
                     "<head><title>Duke's Bookstore</title></head>");
 
         // Get the dispatcher; it gets the banner to the user
         RequestDispatcher dispatcher =
                getServletContext().getRequestDispatcher("/banner");
                                        
             if (dispatcher != null)
                dispatcher.include(request, response);
                                      
         try {      
            BookDetails bd = bookDB.getBookDetails("203");      
 
             
            //Left cell -- the "book of choice"
            out.println("<b>" + messages.getString("What") + "</b>" +
                        "<p>" + "<blockquote>" + 
                               "<em><a href=\"" +
                        response.encodeURL(request.getContextPath() + "/bookdetails?bookId=203") +
                        "\">" + bd.getTitle() + "</a></em>" + messages.getString("Talk") + "</blockquote>");
            
            //Right cell -- various navigation options
            out.println("<p><a href=\"" +
                        response.encodeURL(request.getContextPath() + "/catalog") +
                        "\"><b>" + messages.getString("Start") + "</b></a></font><br>" +
                        "<br> &nbsp;" +
                        "<br> &nbsp;" +
                        "<br> &nbsp;" +
                        "</body>" +
                        "</html>");
          } catch (BookNotFoundException ex) {
                   response.resetBuffer();
             throw new ServletException(ex);
          }
          out.close();
     }
 
     public String getServletInfo() {
         return "The BookStore servlet returns the main web page " +
                "for Duke's Bookstore.";
     }
 }