buybook_jsp.java

模仿Taobao购物网

package org.apache.jsp;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
import java.util.*;
import taobaoproject.*;

public final class buybook_jsp extends org.apache.jasper.runtime.HttpJspBase
    implements org.apache.jasper.runtime.JspSourceDependent {

  private static java.util.Vector _jspx_dependants;

  public java.util.List getDependants() {
    return _jspx_dependants;
  }

  public void _jspService(HttpServletRequest request, HttpServletResponse response)
        throws java.io.IOException, ServletException {

    JspFactory _jspxFactory = null;
    PageContext pageContext = null;
    HttpSession session = null;
    ServletContext application = null;
    ServletConfig config = null;
    JspWriter out = null;
    Object page = this;
    JspWriter _jspx_out = null;
    PageContext _jspx_page_context = null;


    try {
      _jspxFactory = JspFactory.getDefaultFactory();
      response.setContentType("text/html; charset=GBK");
      pageContext = _jspxFactory.getPageContext(this, request, response,
      			null, true, 8192, true);
      _jspx_page_context = pageContext;
      application = pageContext.getServletContext();
      config = pageContext.getServletConfig();
      session = pageContext.getSession();
      out = pageContext.getOut();
      _jspx_out = out;

      out.write("\r\n");
      out.write("\r\n");
      out.write("\r\n");

if((String)session.getValue("Enter") != "true") {
  String errmsg = "error2";
  response.sendRedirect("login.jsp?errmsg="+errmsg);
}
else{
  //获得手机ID
  int goodsID=1;
  String goodsIDs = request.getParameter("goodsID");
  if(goodsIDs != null)
  goodsID = java.lang.Integer.parseInt(goodsIDs);
  java.lang.System.out.println(goodsID);
  //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");
}

      out.write('\r');
      out.write('\n');
    } catch (Throwable t) {
      if (!(t instanceof SkipPageException)){
        out = _jspx_out;
        if (out != null && out.getBufferSize() != 0)
          out.clearBuffer();
        if (_jspx_page_context != null) _jspx_page_context.handlePageException(t);
      }
    } finally {
      if (_jspxFactory != null) _jspxFactory.releasePageContext(_jspx_page_context);
    }
  }
}