📄 catalogservlet.java
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/* * * Copyright 2001 Sun Microsystems, Inc. All Rights Reserved. * * This software is the proprietary information of Sun Microsystems, Inc. * Use is subject to license terms. * */import java.io.*;import java.util.*;import javax.servlet.*;import javax.servlet.http.*;import database.*;import cart.*;import util.Currency;import exception.*;/** * This is a simple example of an HTTP Servlet. It responds to the GET * method of the HTTP protocol. */public class CatalogServlet 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 { // Get the user's session and shopping cart HttpSession session = request.getSession(true); ResourceBundle messages = (ResourceBundle)session.getAttribute("messages"); ShoppingCart cart = (ShoppingCart)session.getAttribute("cart"); // If the user has no cart, create a new one if (cart == null) { cart = new ShoppingCart(); session.setAttribute("cart", cart); } // 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>" + messages.getString("TitleBookCatalog") + "</title></head>"); // Get the dispatcher; it gets the banner to the user RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/banner"); if (dispatcher != null) dispatcher.include(request, response); //Information on the books is from the database through its front end // Additions to the shopping cart String bookId = request.getParameter("bookId"); if (bookId != null) { try { BookDetails book = bookDB.getBookDetails(bookId); cart.add(bookId, book); out.println("<p><h3>" + "<font color=\"#ff0000\">" + messages.getString("CartAdded1") + "<i>" + book.getTitle() + "</i> " + messages.getString("CartAdded2") + "</font></h3>"); } catch (BookNotFoundException ex) { response.reset(); throw new ServletException(ex); } } //Give the option of checking cart or checking out if cart not empty if (cart.getNumberOfItems() > 0) { out.println("<p><strong><a href=\"" + response.encodeURL(request.getContextPath() + "/showcart") + "\">" + messages.getString("CartCheck") + "</a> " + "<a href=\"" + response.encodeURL(request.getContextPath() + "/cashier") + "\">" + messages.getString("Buy") + "</a>" + "</p></strong>"); } // Always prompt the user to buy more -- get and show the catalog out.println("<br> " + "<h3>" + messages.getString("Choose") + "</h3>" + "<center> <table>"); try { Collection coll = bookDB.getBooks(); Iterator i = coll.iterator(); Currency c = (Currency)session.getAttribute("currency"); if (c == null) { c = new Currency(); c.setLocale(request.getLocale()); session.setAttribute("currency", c); } while (i.hasNext()) { BookDetails book = (BookDetails)i.next(); bookId = book.getBookId(); c.setAmount(book.getPrice()); //Print out info on each book in its own two rows out.println("<tr>" + "<td bgcolor=\"#ffffaa\">" + "<a href=\"" + response.encodeURL(request.getContextPath() + "/bookdetails?bookId=" + bookId) + "\"> <strong>" + book.getTitle() + " </strong></a></td>" + "<td bgcolor=\"#ffffaa\" rowspan=2>" + c.getFormat() + " </td>" + "<td bgcolor=\"#ffffaa\" rowspan=2>" + "<a href=\"" + response.encodeURL(request.getContextPath() + "/catalog?bookId=" + bookId) + "\"> " + messages.getString("CartAdd") + " </a></td></tr>" + "<tr>" + "<td bgcolor=\"#ffffff\">" + " " + messages.getString("By") + "<em> " + book.getFirstName() + " " + book.getSurname() + "</em></td></tr>"); } } catch (BooksNotFoundException ex) { response.reset(); throw new ServletException(ex); } out.println("</table></center></body></html>"); out.close(); } public String getServletInfo() { return "The Catalog servlet adds books to the user's " + "shopping cart and prints the catalog."; }}⌨️ 快捷键说明
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