📄 receiptservlet.java

📁 jsp 应用开发技术光盘是《jsp应用开发技术》这本书的源代码

💻 JAVA

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package servlets;import java.io.*;import javax.servlet.*;import javax.servlet.http.*;import cart.ShoppingCart;import database.*;import exception.*;public class ReceiptServlet extends HttpServlet {    private BookDBAO bookDB;    public void init() throws ServletException {        bookDB = (BookDBAO) getServletContext()                                .getAttribute("bookDB");        if (bookDB == null) {            throw new UnavailableException("Couldn't get database.");        }    }    public void destroy() {        bookDB = null;    }    public void doPost(HttpServletRequest request, HttpServletResponse response)        throws ServletException, IOException {        boolean orderCompleted = true;        // Get the user's session and shopping cart        HttpSession session = request.getSession(true);                ShoppingCart cart = (ShoppingCart) session.getAttribute("cart");        if (cart == null) {            cart = new ShoppingCart();            session.setAttribute("cart", cart);        }        // Update the inventory        try {            bookDB.buyBooks(cart);        } catch (OrderException e) {            System.err.println(e.getMessage());            orderCompleted = false;        }        // Payment received -- invalidate the session        session.invalidate();        // set content type header before accessing the Writer        response.setContentType("text/html;charset=gb2312");        response.setBufferSize(8192);        PrintWriter out = response.getWriter();        // then write the response        out.println("<html>" + "<head><title>BookStore</title></head>");        // Get the dispatcher; it gets the banner to the user        RequestDispatcher dispatcher =            getServletContext()                .getRequestDispatcher("/head");        if (dispatcher != null) {            dispatcher.include(request, response);        }        if (orderCompleted) {            out.println("<center><h3>" + "谢谢光临，欢迎下次再来 " +                request.getParameter("cardname") + ".");        } else {            out.println("<h3>" + "对不起，暂时缺货。");        }        out.println("<p> &nbsp; <p><strong><a href=\"" +            response.encodeURL(request.getContextPath()) + "/bookstore\">" +            "继续购物" +            "</a> &nbsp; &nbsp; &nbsp;" + "</center></body></html>");        out.close();    }    public String getServletInfo() {        return "The Receipt servlet updates the book database inventory, invalidates the user session, " +        "thanks the user for the order.";    }}

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