购物车

来源：互联网发布：sql删除表中带约束的列编辑：程序博客网时间：2024/06/09 16:43

jsp:去调用Delete类

<%@ page language="java" import="java.util.*,javabean.Orders" pageEncoding="UTF-8"%>
<center><%@ include file="top.html"%></center>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>查看购物中心</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">

    
  </head>

  <body>
  <%! double total=0;
      int size=0;
  %>
     <br>
     <center><font size=5 color=red>您所选的商品：</font></center>
     <table border=1 cellspacing=0 bgcolor="#ffccff" align=center width=80%>
     <tr>
     <TD align=center>商品编号</TD><TD align=center>商品名称</TD><TD align=center>商品类型</TD>
     <TD align=center>商品单价</TD><TD align=center>数量</TD><TD align=center>小计</TD>
     <TD align=center>操作</TD>
     </tr>
     <%
      request.setCharacterEncoding("gb2312");
      response.setContentType("text/html;charset=gb2312");

       Vector vc=(Vector)session.getAttribute("vector");
       if(vc==null){
       out.print("您还没有购物！！！");
       out.print("<A href='jsp/Checkout.jsp'>继续购物</A>"+" ");
       out.close();
       }
       Orders ord=new Orders();
       size=vc.size();
       for(int i=0;i<vc.size();i++){
       ord=(Orders)vc.elementAt(i);
       System.out.println("集合的大小："+vc.size());
       session.setAttribute("vcc",vc);
     %>
     <TR>
      <TD align=center><%=ord.getId()%></TD>
      <TD align=center><%=ord.getName()%></TD>
      <TD align=center><%=ord.getType()%></TD>
      <TD align=center><%=ord.getPrice()%></TD>
      <TD align=center><%=ord.getCount()%></TD>
      <TD align=center><%=ord.getAmount()%></TD>
      <%
          total=total+ord.getAmount();
      %>
      <TD align=center>
             <form action="./servlet/Delete" method=post>
             <input type=hidden name=ize value=<%=i%>>
             <input type=hidden name=total value=<%=total%>>
             <input type=hidden name=amount value=<%=ord.getAmount()%>>
             <input type=submit name=delete value="删除">
             </form>
      </TD>
     </TR>
     <%}%>
     <tr>
      <TD align=center colspan=7>总计：<%=total%></TD>
     </tr>

     </table>
     <center><br>
     <A href="jsp/Checkout.jsp">继续购物</A>
     <A href="jsp/buy_goods.jsp">前台结帐</A>
     </center>
  </body>
</html>

Servlet:-->Delete类

package javabean;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Vector;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import javabean.ConnectionDB;

public class Delete extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
         doPost(request,response);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html;charset=gb2312");
        PrintWriter out = response.getWriter();

            HttpSession session=request.getSession(true);

            String ize=request.getParameter("ize");
            int in=Integer.parseInt(ize);

            String total=request.getParameter("total");
            String amount=request.getParameter("amount");

            double to=Double.parseDouble(total);
            double am=Double.parseDouble(amount);

            double tot=to-am;
            System.out.println(tot);
            Vector ve=(Vector)session.getAttribute("vcc");
            ve.removeElementAt(in);

            System.out.println(in);
            System.out.println(ve.size());

            response.sendRedirect("/BookProject/jsp/shopping_cart.jsp");


    }

}