mysql + jsp 链接的虚拟购物车

mac2024-05-10 12

整体思路：先写一个JSP用于实现商品图片的读取（再次之前要写好连接数据库），当点加入购物车市，根据商品唯一的标识来添加进去（商品的ID号），点击查看购物车可以看到刚添加进去的东西，和价钱，点击删除可以删除商品。点击返回就到商品商城

前置工作封装一个包用来包装整个实体 product

package com.huangxu.Dao; import java.sql.Date; public class product { private int pid; private int ptype; private String pname; private float pprice; private int pquantity; private String pimage; private String pdesc; private Date ptime; public int getPid() { return pid; } public void setPid(int pid) { this.pid = pid; } public int getPtype() { return ptype; } public void setPtype(int ptype) { this.ptype = ptype; } public String getPname() { return pname; } public void setPname(String pname) { this.pname = pname; } public float getPprice() { return pprice; } public void setPprice(float pprice) { this.pprice = pprice; } public int getPquantity() { return pquantity; } public void setPquantity(int pquantity) { this.pquantity = pquantity; } public String getPimage() { return pimage; } public void setPimage(String pimage) { this.pimage = pimage; } public String getPdesc() { return pdesc; } public void setPdesc(String pdesc) { this.pdesc = pdesc; } public Date getPtime() { return ptime; } public void setPtime(Date ptime) { this.ptime = ptime; } }

接下来我来连接数据库其实购物车的上架有很多种方法, 可以占用运行时的内存去处理, 但是我们在学过数据库之后, 应该用链接数据库大方式进行管理.

package com.huangxu; import java.sql.SQLException; import java.util.ArrayList; import java.util.List; import com.huangxu.Dao.product; public class ProductDAO extends jdbcDao { /* * 得到产品的信息 */ public List<product> getAllproducts() { String sql = "select * from product"; List<product> plist = new ArrayList<product>(); try { conn = getConnection(); pst = conn.prepareStatement(sql); rs=pst.executeQuery(); while(rs.next()){ product p=new product(); p.setPid(rs.getInt(1)); p.setPtype(rs.getInt(2)); p.setPname(rs.getString(3)); p.setPprice(rs.getFloat(4)); p.setPquantity(rs.getInt(5)); p.setPimage(rs.getString(6)); p.setPdesc(rs.getString(7)); p.setPtime(rs.getDate(8)); plist.add(p); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return plist; } public product findProductByID(int pid) { product p=null; String sql="SELECT * from product where pid=?"; try { pst=getConnection().prepareStatement(sql); pst.setInt(1, pid); rs=pst.executeQuery(); if(rs.next()) { p=new product(); p.setPid(rs.getInt(1)); p.setPtype(rs.getInt(2)); p.setPname(rs.getString(3)); p.setPprice(rs.getFloat(4)); p.setPquantity(rs.getInt(5)); p.setPimage(rs.getString(6)); p.setPdesc(rs.getString(7)); p.setPtime(rs.getDate(8)); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); }finally { close(); } return p; } }

之前的数据库已经连接完毕

jsp的页面来设计及购物车 product.jsp

<%@page import="java.util.ArrayList"%> <%@page import="java.util.List"%> <%@page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@page import="com.huangxu.ProductDAO"%> <%@ page import="com.huangxu.Dao.product"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> <style type="text/css"> .mybox { widows: 200pt; height: auto; border: 1px solid red; float: left; margin: 10px 10px; padding: 5px 10px; } .mybox:HOVER { background-color: #FAB; } </style> </head> <body> <% List list=(List)session.getAttribute("shopcar"); if(list==null){ list=new ArrayList(); session.setAttribute("shopcar", list); } out.println("&nbsp&nbsp "+"已经添加"+list.size()+"件商品"); %> <div width="860px"> <% ProductDAO pdao=new ProductDAO(); for(product p:pdao.getAllproducts()){ %> <div class="mybox"> <span><img src="<%=p.getPimage()%>"></span><br> 名字：<span><%=p.getPname()%></span><br> 库存：<span><%=p.getPquantity()%></span>个<br> 单价：<span>￥<%=p.getPprice()%></span>元<br> <span><a href="shop.jsp?pid=<%=p.getPid()%>">加入购物车</a></span> </div> <% } %> </div> </div> <br> <div> <hr> <a href="showshop.jsp">查看购物车</a> </div> </body> </html>

加入购物车的实际操作处理点击加入即可加入

处理查看购物车的操作 shopp.jsp

<%@page import="java.util.List"%> <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@page import="com.huangxu.ProductDAO"%> <%@ page import="com.huangxu.Dao.product"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <table width="400" border="0" cellpadding="0" cellspacing="1" bgcolor="#00FF66"> <tr bgcolor="#FFFFFF"> <th>序号</td> <th>商品名</td> <th>价格</td> <th>删除</td> </tr> <% List<product>list=(List)session.getAttribute("shopcar"); //购物车的判定 float sum=0; if(list!=null) { for(product p:list) {sum =sum+ p.getPprice(); %> <tr bgcolor="#FFFFFF"> <td><%=list.indexOf(p)+1 %></td> <td><%=p.getPname() %></td> <td><%=p.getPprice() %></td> <td><a href="spsc.jsp?xl=<%=list.indexOf(p)%>">删除商品</a></td> </tr> <% } } %> <tr bgcolor="#FFFFFF"> <td colspan="2">合计</td> <td colspan="2"><%=sum %>元</td> </tr> <tr><td colspan="3"><a href="imgs.jsp">返回商城</a></td></tr> </table> </body> </html>

删除购物车操作

<%@page import="com.sun.corba.se.spi.orbutil.fsm.FSM"%> <%@page import="com.huangxu.Dao.product"%> <%@page import="java.util.List"%> <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <% float sum=0; int xl=Integer.parseInt(request.getParameter("xl")); List<product>list=(List)session.getAttribute("shopcar"); if(list.remove(xl)!=null){%> <table width="400" border="0" cellpadding="0" cellspacing="1" bgcolor="#00FF66"> <tr bgcolor="#FFFFFF"> <th>序号</td> <th>商品名</td> <th>价格</td> <th>删除</td> </tr> <% for(product p:list){ sum =sum+ p.getPprice(); %> <tr bgcolor="#FFFFFF"> <td><%=list.indexOf(p)+1 %></td> <td><%=p.getPname() %></td> <td><%=p.getPprice() %></td> <td><a href="spsc.jsp?xl=<%=list.indexOf(p)%>">删除商品</a></td> </tr> <% } }else{ response.sendRedirect("imgs.jsp");} %> <tr bgcolor="#FFFFFF"> <td colspan="2">合计</td> <td colspan="2"><%=sum %>元</td> </tr> <tr><td colspan="3"><a href="imgs.jsp">返回商城</a></td></tr> </table> </body> </html>

下是我创建的数据库表的源代码

ALTER TABLE `shop`.`id` ADD COLUMN `type` varchar(255) NULL AFTER `ID`, ADD COLUMN `name` varchar(255) NULL AFTER `type`, ADD COLUMN `price` double(255) NULL AFTER `name`, ADD COLUMN `quantity` int(255) NULL AFTER `price`, ADD COLUMN `image` varchar(255) NULL AFTER `quantity`, ADD COLUMN `` varchar(255) NULL AFTER `image`;

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