shoppingcar.java

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;
    //Initialize global variables
    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("boylist------------"+buylist);
                } else {
                    for (int i = 0; i < buylist.size(); i++) {
                        BookInfoBean book = (BookInfoBean)
                                            buylist.elementAt(i);
                        //假若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); //发报机转发请求纸购物页
            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);
            }
            //String Bookamount = null;
            TradeDB objTDB = new TradeDB();
            //tradeBean objTdb = new tradeBean();
            objTdb.setTradeNO(TradeNo);

            objTdb.setMemberUid(MemberID);

            String tradeDate=date.get(Calendar.YEAR)+"-"+(date.get(Calendar.MONTH)+1)+"-"+date.get(Calendar.DATE);
            objTdb.setTradeDate(tradeDate);

            if (session.getAttribute("finishLogin") == null ||
                session.getAttribute("finishLogin").equals
                ("")) {
                out.println("对不起，您提交订单失败！");
                out.println("您还没有登陆,请先登陆后再试 .....");
                out.println("<a href='loginPage.jsp'>重新登陆！ < / a > ");
            } else if (session.getAttribute
                       ("finishLogin").toString().equals(
                               "true")) {
                if (objTDB.InsertDB(objTdb)) {

                    TradeInfoBean objTiB = null;
                    TradeInfoDB objTidb = new TradeInfoDB();
                    int i = 0;
                    System.out.println(buylist.size());
                    while (i < buylist.size()) {
                        objTiB = new TradeInfoBean();
                        objTiB.setTradeno(TradeNo);
                        objTiB.setBookno(((BookInfoBean)
                                          buylist.get(i)).
                                         getBookNo());
                        objTiB.setTradecount(((BookInfoBean)
                                          buylist.get(i)).getBookCount());
                        objTidb.InsertDB(objTiB);
                        i++;
                    }

                } else {
                    out.println("对不起，您提交订单失败！ <br /> ");
                    out.println("可能是您还没有登陆或系统繁忙，请重新登录后再试 <br /> ");
                    out.println("<a href='loginPage.jsp'>重新登陆 ！ </a> ");
                }
            }
            session.setAttribute("TradeNo",TradeNo);
            String url = "Checkout.jsp";
            RequestDispatcher rd =
                    request.getRequestDispatcher(url); //发报机转发请求至结账页
            rd.forward(request, response);
        }
    }

    /**
     * 此方法实现把客户端提交的购物数据封装到JavaBean类Book中
     * @param req HttpServletRequest
     * @return Book
     */
    private BookInfoBean getBook(HttpServletRequest req) {
        ConnBean db = new ConnBean();
        HttpSession session = req.getSession();
        String BookNo = req.getParameter("hBookNo");
        String BookName = req.getParameter("hBookName");
        String author = req.getParameter("hAuthor");
        String BookType = req.getParameter("hBookType");
        String Book_concern = req.getParameter
                              ("hBook_concern");
        String price = req.getParameter("hPrice");
        String BookCount = req.getParameter("hBookCount");
        String Image = req.getParameter("hImage");

        BookInfoBean bk = new BookInfoBean();
        bk.setBookNo(BookNo);
        bk.setBookName(BookName);
        bk.setAuthor(author);
        bk.setBookType(Integer.parseInt(BookType));
        bk.setPrice(Float.parseFloat(price));
        bk.setBook_concern(Book_concern);
        bk.setBookCount(Integer.parseInt(BookCount));
        bk.setImage(Image);
        return (bk);
    }

    //Process the HTTP Post request
    public void doPost(HttpServletRequest request,
                       HttpServletResponse response) throws
            ServletException, IOException {
        doGet(request, response);
    }

    //Clean up resources
    public void destroy() {
    }
}