shoppingcar.java~13~

JSP制作的一个在线书店 拥有简单的功能 请看看吧 初学者

package bookadmin;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import common.*;
import common.MemberBean;
import ConnBean.*;
import bookadmin.loginServlet;
import ConnBean.TradeInfoDB;
import java.util.Calendar;

/**
 * 此Servlet充当MVC中的Controller角色
 */
public class ShoppingCar extends HttpServlet {
    private static final String CONTENT_TYPE = "text/html;charset = GB2312";
    int hour;

    public void init() throws ServletException {
    }

    //Process the HTTP Get request
    public void doGet(HttpServletRequest request,
                      HttpServletResponse response) throws
            ServletException, IOException {
        response.setContentType(CONTENT_TYPE);
        request.setCharacterEncoding("GB2312");
        response.setCharacterEncoding("GB2312");
        PrintWriter out = response.getWriter();
        HttpSession session = request.getSession();
        //若session为null时，程序将导向Error.html
        if (session == null)
            response.sendRedirect("Error.html");
        Vector buylist = (Vector) session.getAttribute("shoppingcart");
        String action = request.getParameter("action");
        if (!action.equals("CHECKOUT")) {
            //删除购物车中的书籍
            if (action.equals("DELETE")) {
                String del = request.getParameter("del");
                int d = Integer.parseInt(del);
                buylist.removeElementAt(d);
            }
            //新增书籍至购物车
            else if (action.equals("ADD")) {
                boolean match = false;
                //取得后来新增的书籍
                BookInfoBean abook = this.getBook(request);

                //新增第一本书至购物车时
                if (buylist == null) {
                    buylist = new Vector();
                    buylist.addElement(abook);
                    //System.out.println("abook--------"+abook);
                    //System.out.println("buylist------"+buylist);
                } else {
                    for (int i = 0; i <buylist.size(); i ++) {
                        BookInfoBean book = (BookInfoBean)
                                            buylist.elementAt(i);
                        //如果新增的书籍和购物车的书籍一样时
                        if (book.getBookName().equals
                            (abook.getBookName())) {
                            book.setBookCount
                                    (book.getBookCount() + abook.getBookCount());
                            buylist.setElementAt(book, i);
                            match = true;
                        }
                    }
                    if (!match)
                        buylist.addElement(abook);
                }
            }
            session.setAttribute("shoppingcart", buylist);
            String url = "Car.jsp";
            RequestDispatcher rd =
                    request.getRequestDispatcher(url); //将请求转发至购物页
            rd.forward(request, response);
        }
        //结账，计算购物车书籍价钱总数
        else if (action.equals("CHECKOUT")) {
            float total = 0;
            for (int i = 0 ; i < buylist.size(); i++) {
                BookInfoBean order = (BookInfoBean)
                                     buylist.elementAt(i);
                float price = order.getPrice();
                int quantity = order.getBookCount();
                total += (price * quantity);
            }
            String amount = total + "";
            tradeBean objTdb = new tradeBean();
            objTdb.setCountMoney(Float.parseFloat(amount));
            request.setAttribute("amount", amount);//总计金额
            //System.out.println("总计："+amount);
            //Vector BookCount = new Vector();
            //保存书籍编号
            //BookCount = (Vector) session.getAttribute("Count");//保存订书数量

            Calendar date = Calendar.getInstance();
            if (date.get(Calendar.AM_PM) == date.get
               (Calendar.AM)) {
                hour = date.get(Calendar.HOUR) + 12;
            }
            String TradeNo = "" + date.get(Calendar.YEAR) +
                                 (date.get(Calendar.MONTH) + 1) +
                                 date.get(Calendar.DATE) + hour +
                                 date.get(Calendar.MINUTE) +
                                 date.get(Calendar.SECOND) +
                                 date.get(Calendar.MILLISECOND);
            String MemberID = null;
            if (session.getAttribute("MemberNo") != null ||
                !session.getAttribute
                ("MemberNo").equals("")) {
                MemberID = session.getAttribute
                            ("MemberNo").toString();
                //System.out.println("upServlet---------"+MemberID);
            }
            }


        }
    }