shop_servlet.java

jsp servlet java bean实现的购物车代码

package com;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;

public class Shop_Servlet extends HttpServlet {
    private static final String CONTENT_TYPE = "text/html; charset=GBK";

    //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("gbk");//处理 乱码
        PrintWriter out = response.getWriter();
        out.println("<center><h1>你放在购物篮里的商品是：</h1><hr/>");
        HttpSession session = request.getSession();//获得session

        try{
            String items[] = request.getParameterValues("item1"); //购买的商品列表
            List list = (ArrayList) session.getAttribute("Shop_Table");//从session中获得已选的商品列表
            if (list == null) {
                list = new ArrayList();//还没购物车时，实例一个购物车
            }
            Product_car pc = new Product_car();
            pc.setMybasket(list);
            if (items != null) {
                for (int i = 0; i < items.length; i++) {
                    Product_Bean pb = new Product_Bean();
                    pb.setName(items[i]);
                    pb.setNum(1);
                    pc.addProduct(pb);  //加入一个电器
                }
                list = pc.getMybasket();//获得加后的购物车中的商品列表
                session.setAttribute("Shop_Table",list);//把新的产品列表 放入session
            }
            //如果购物车中有商品则 显示出来
            if(list!=null&&list.size()>0){
                for (int i = 0; i < list.size(); i++) {
                    Product_Bean pb = (Product_Bean)list.get(i);
                    out.println(pb.getName() +":"+pb.getNum()+ "<br/>");
                }
            }else{
                out.println("<h1>你购物篮里没有商品</h1>");
            }
        }catch(Exception e){
            e.printStackTrace();
        }
        out.println("<hr/>");
        out.println("<a href='product_list.htm'>继续购买商品</a>");
        out.close();
    }

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

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