orderfilter.java

JavaeeTutorial5的源代码。

/*
 * Copyright 2007 Sun Microsystems, Inc.
 * All rights reserved.  You may not modify, use,
 * reproduce, or distribute this software except in
 * compliance with  the terms of the License at:
 * http://developer.sun.com/berkeley_license.html
 */


package com.sun.bookstore1.filters;

import java.io.*;
import java.sql.Timestamp;
import java.util.Iterator;
import javax.servlet.*;
import javax.servlet.http.*;
import com.sun.bookstore.database.Book;
import com.sun.bookstore.cart.ShoppingCart;
import com.sun.bookstore.cart.ShoppingCartItem;
import com.sun.bookstore.database.Book;
import com.sun.bookstore1.util.*;


public final class OrderFilter implements Filter {
    private FilterConfig filterConfig = null;

    public void init(FilterConfig filterConfig) throws ServletException {
        this.filterConfig = filterConfig;
    }

    public void destroy() {
        this.filterConfig = null;
    }

    public void doFilter(
        ServletRequest request,
        ServletResponse response,
        FilterChain chain) throws IOException, ServletException {
        if (filterConfig == null) {
            return;
        }

        // Render the generic servlet request properties
        StringWriter sw = new StringWriter();
        PrintWriter writer = new PrintWriter(sw);
        ServletContext context = filterConfig.getServletContext();
        Counter counter = (Counter) context.getAttribute("orderCounter");
        HttpServletRequest hsr = (HttpServletRequest) request;
        HttpSession session = hsr.getSession();
        ShoppingCart cart = (ShoppingCart) session.getAttribute("cart");
        Currency c = (Currency) session.getAttribute("currency");
        c.setAmount(cart.getTotal());
        writer.println();
        writer.println(
                "=======================================================");
        writer.println(
                "The total number of orders is: " + counter.incCounter());
        writer.println(
                "This order Received at "
                + (new Timestamp(System.currentTimeMillis())));
        writer.println();
        writer.print("Purchased by: " + request.getParameter("cardname"));
        writer.println();
        writer.print("Total: " + c.getFormat());
        writer.println();

        int num = cart.getNumberOfItems();

        if (num > 0) {
            Iterator i = cart.getItems()
                             .iterator();

            while (i.hasNext()) {
                ShoppingCartItem item = (ShoppingCartItem) i.next();
                Book book = (Book) item.getItem();
                writer.print("ISBN: " + book.getBookId());
                writer.print("   Title: " + book.getTitle());
                writer.print("   Quantity: " + item.getQuantity());
                writer.println();
            }
        }

        writer.println(
                "=======================================================");

        // Log the resulting string
        writer.flush();
        System.out.println(sw.getBuffer().toString());
        chain.doFilter(request, response);
    }

    public String toString() {
        if (filterConfig == null) {
            return ("OrderFilter()");
        }

        StringBuffer sb = new StringBuffer("OrderFilter(");
        sb.append(filterConfig);
        sb.append(")");

        return (sb.toString());
    }
}