orderfilter.java

J2EE导学

/*
 *
 * Copyright 2001 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * This software is the proprietary information of Sun Microsystems, Inc.  
 * Use is subject to license terms.
 * 
 */

package filters;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.sql.Timestamp;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import database.BookDetails;
import cart.*;
import java.util.*;
import util.*;

public final class OrderFilter implements Filter {

    private FilterConfig 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 = new Currency();
                 c.setLocale(request.getLocale());
                 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();
                        BookDetails bookDetails = (BookDetails) item.getItem();
                        writer.print("ISBN: "  + bookDetails.getBookId());
                        writer.print("   Title: "  + bookDetails.getTitle());
                        writer.print("   Quantity: " + item.getQuantity());
                        writer.println();			
                  }
            }


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

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

    public FilterConfig getFilterConfig() {
            return (this.filterConfig);
    }

      public void setFilterConfig(FilterConfig filterConfig) {
            this.filterConfig = filterConfig;
      }

    public String toString() {
         if (filterConfig == null)
               return ("OrderFilter()");
         StringBuffer sb = new StringBuffer("OrderFilter(");
         sb.append(filterConfig);
         sb.append(")");
         return (sb.toString());

    }


}