buybook.jsp~26~

模仿Taobao购物网

<%@ page contentType="text/html; charset=GBK" %>
<%@ page import="java.util.*" %>
<%@ page import="taobaoproject.*" %>
<%@ include file="check.jsp" %>
<%
//获得手机ID
int goodsID=1;
String goodsIDs = request.getParameter("goodsID");
if(goodsIDs != null)
  goodsID = java.lang.Integer.parseInt(goodsIDs);
//获得购买数量
int buynum=1;
String buynums = request.getParameter("buynum");
if(buynums != null)
  buynum = java.lang.Integer.parseInt(buynums);
//使用向量类作为购物车的变量类型
Vector buylist = (Vector)session.getValue("shopcar");
int ismatch = 0;
ShouJI_Bean shouJi = new ShouJI_Bean();
shouJi.buy(goodsID,buynum);
if(buylist == null) {
  buylist = new Vector();
  buylist.addElement(shouJi);
}
else {//如果购物车不为空
  //检查用户所选购的手机是否在于购物车中
  for(int i = 0; i < buylist.size(); i++) {
    ShouJI_Bean _shouJi = (ShouJI_Bean)buylist.elementAt(i);
    //如果已存在.则在原来的数量上加入新的购买数量
    if(_shouJi.getGoodsID() == shouJi.getGoodsID()) {
      _shouJi.setBuynum((_shouJi.getBuynum() + shouJi.getBuynum()));
      buylist.setElementAt(_shouJi,i);
      ismatch = 1;
    }
  }
  //如果不存在,则直接向购物车中添加手机
  if(ismatch == 0)
    buylist.addElement(shouJi);
}
//更新 session 变量
session.putValue("shopcar", buylist);
//重定向到查看购物车页面
response.sendRedirect("shopcar.jsp");
%>