transmit_cart.java

用J2EE开发的网站,可以应用到图书馆,图书超市

package ksnb;

//接受商品id，以放入购物车的servlet类
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;

public class Transmit_Cart extends HttpServlet {
    private static final String CONTENT_TYPE = "text/html; charset=gb2312";
    Book b = null;
    FurnitureCart cart = null;
    String page="";
    //Initialize global variables
    public void init() throws ServletException
    {
     cart=new FurnitureCart();
    }

    //Process the HTTP Get request
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws
            ServletException, IOException {
        response.setContentType(CONTENT_TYPE);
        HttpSession session = request.getSession(true);

        if (session.getAttribute("Account") == null) {
                page = "logout";
            } else {
                String id; //书ID
                String name; //书名
                float price; //价格
                id = request.getParameter("id"); //获得商品id
                session.setAttribute("ID",id);
                name = request.getParameter("name");
                //author=request.getParameter("author");
                price = Float.parseFloat(request.getParameter("price"));
                //concern=request.getParameter("book_concern");
                try {
                    cart.addItem(id, name, price, 1); //第一次数量默认为1
                    System.out.println("price:" + price);
                    //这里应该弹出一个对话框，告诉用户商品已添加到购物车，然后返回原页面
                    //out.println("<javascript>alert('购买成功');</javascript>");//不行啊,那就不用了!
                } catch (Exception e) {
                    System.out.println(e.toString());
                }
                session.setAttribute("cart", cart);
                page = "logon";
            }
            RequestDispatcher rd = request.getRequestDispatcher("1.jsp?page=" +
                    page);
            rd.forward(request, response);


        }

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