📄 catalogservlet.java
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/*Copyright (c) 1998 Sun Microsystems, Inc. All Rights Reserved.This software is the confidential and proprietary information of SunMicrosystems, Inc. ("Confidential Information"). You shall notdisclose such Confidential Information and shall use it only inaccordance with the terms of the license agreement you entered intowith Sun.SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THESOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THEIMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULARPURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGESSUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTINGTHIS SOFTWARE OR ITS DERIVATIVES.CopyrightVersion 1.0*/import java.io.*;import javax.servlet.*;import javax.servlet.http.*;import database.*;import cart.ShoppingCart;/** * This is a simple example of an HTTP Servlet. It responds to the GET * and HEAD methods of the HTTP protocol. This servlet calls other * servlets. This catalog calls other servlets. */public class CatalogServlet extends HttpServlet { public void doGet (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // Get the user's session and shopping cart HttpSession session = request.getSession(true); ShoppingCart cart = (ShoppingCart)session.getValue(session.getId()); // If the user has no cart, create a new one if (cart == null) { cart = new ShoppingCart(); session.putValue(session.getId(), cart); } // set content-type header before accessing the Writer response.setContentType("text/html"); PrintWriter out = response.getWriter(); // then write the data of the response out.println("<html>" + "<head><title> Book Catalog </title></head>" + "<body bgcolor=\"#ffffff\">" + "<center>" + "<hr> <br> " + "<h1>" + "<font size=\"+3\" color=\"red\">Duke's </font>" + "<font size=\"+3\" color=\"purple\">Bookstore</font>" + "</h1>" + "</center>" + "<br> <hr> <br> "); //Data on the books are from the database servlet BookDBServlet database = (BookDBServlet) getServletConfig().getServletContext().getServlet("bookdb"); // Additions to the shopping cart String bookToAdd = request.getParameter("Buy"); if (bookToAdd != null) { BookDetails book = database.getBookDetails(bookToAdd); cart.add(bookToAdd, book); out.println("<p><h3>" + "<font color=\"#ff0000\">" + "You just added <i>" + book.getTitle() + "</i> "+ "to your shopping cart</font></h3>"); } //Give the option of checking cart or checking out if cart not empty if (cart.getNumberOfItems() > 0) { out.println("<table><tr>" + "<th align=\"left\"><a href=\"" + response.encodeUrl("/servlet/showcart") + "\"> Check Shopping Cart</a></th>" + "<th> </th>" + "<th align=\"right\"><a href=\"" + response.encodeUrl("/servlet/cashier") + "\"> Buy your Books</a></th>" + "</tr></table"); } // Always prompt the user to buy more -- get and show the catalog out.println("<br> " + "<h3>Please choose from our selections</h3>" + "<center> <table>"); BookDetails[] books = database.getBooksSortedByTitle(); int numBooks = database.getNumberOfBooks(); for(int i=0; i < numBooks; i++) { String bookId = books[i].getBookId(); //Print out info on each book in its own two rows out.println("<tr>" + "<td bgcolor=\"#ffffaa\">" + "<a href=\"" + response.encodeUrl("/servlet/bookdetails?bookId=" + bookId) + "\"> <strong>" + books[i].getTitle() + " </strong></a></td>" + "<td bgcolor=\"#ffffaa\" rowspan=2>" + "$" + books[i].getPrice() + " </td>" + "<td bgcolor=\"#ffffaa\" rowspan=2>" + "<a href=\"" + response.encodeUrl("/servlet/catalog?Buy=" + bookId) + "\"> Add to Cart </a></td></tr>" + "<tr>" + "<td bgcolor=\"#ffffff\">" + " by <em> " + books[i].getFirstName() + " " + books[i].getSurname() + "</em></td></tr>"); } 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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