小编给大家分享一下怎么用JSP的Session机制编写购物车程序,希望大家阅读完这篇文章之后都有所收获,下面让我们一起去探讨吧!

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JSP Session 机制购物车之一构建的商品类
◆写一个Goods类,并定义商品的各个属性,返回商品属性的方法,以及商品对象进行比较的方法
◆Goods.java
package com.viita.Shop; public class Goods implements Comparable {◆初始化各成员变量
private String Id = null;//商品的编号Id private String name = null;//商品的名称name private float price = 0.00F;//商品的价格price private int number = 0;//商品的数量number public Goods(String Id, String name, float price, int number) { this.Id = Id; this.name = name; this.price = price; this.number = number; } public String getId() //返回订购商品的编号Id { return this.Id; } public String getName() //返回订购商品的名称name { return this.name; } public float getPrice() //返回订购商品的价格price { return this.price; } public int getNumber() //返回订购商品的数量number { return this.number; } public int compareTo(Object m) { // TODO Auto-generated method stub Goods n = (Goods) m; int comRs = Id.compareTo(n.Id); return comRs; } }JSP Session 机制购物车之二购物车实现
◆首先建立Goods(商品)对象goods,并建立建立ArrayList对象ay
◆通过ArrayList对象的方法add()将商品对象添加到ArrayList对象ay中
◆由于ArrayList对象是具有添加和删除成员的方法,从而实现多个商品存储管理于ArrayList对象
◆将ArrayList对象ay存储于session对象当中,实现购物车功能
◆shopcar.jsp
<%@ page language="java" import=" java.sql.*,com.viita.Shop.*,java.util.*" pageEncoding="GBK"%> <%
◆设置编码格式
request.setCharacterEncoding("GBK");◆获取参数信息
String id = request.getParameter("id"); String name = request.getParameter("name"); int number = java.lang.Integer.parseInt(request.getParameter("number")); float price= java.lang.Float.parseFloat(request.getParameter("price"));◆建立商品对象和ArrayList对象
Goods goods = new Goods(id,name,price,number); ArrayList ay = null;
◆如果session中从未写入过,则将建立的商品对象添加到ArrayList对象当中,并写入 session
if((ArrayList)session.getAttribute("car")==null) { ay = new ArrayList(); ay.add(goods); session.setAttribute("car",ay); response.sendRedirect("order_index.jsp"); }◆如果写如过,则将商品对象添加到ArrayList对象当中,并写入 session
else { ay=(ArrayList)session.getAttribute("car");◆如果ArrayList 对象为空,则直接添加到ArrayList对象当中
if(ay.isEmpty()) { ay.add(goods); session.setAttribute("car",ay); response.sendRedirect("order_index.jsp"); }◆如果ArrayList 对象不为空,则判断购入商品是否已经存在于车中
else { Iterator it = ay.iterator(); for(int i = 0;i◆如果购入商品已经存在,则打印输入提示信息
if(shop.compareTo(goods)==0) { out.println("
基本
文件
流程
错误
SQL
调试
- 请求信息 : 2026-05-27 13:16:57 HTTP/1.1 GET : /article/jsgghp.html
- 运行时间 : 0.9840s ( Load:0.0066s Init:0.2346s Exec:0.7235s Template:0.0193s )
- 吞吐率 : 1.02req/s
- 内存开销 : 2,236.42 kb
- 查询信息 : 12 queries 5 writes
- 文件加载 : 36
- 缓存信息 : 0 gets 0 writes
- 配置加载 : 130
- 会话信息 : SESSION_ID=jo75v63t3e8i2hs577nbad5595
- /www/wwwroot/tsicrk.com/index.php ( 1.09 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/ThinkPHP.php ( 4.61 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Think.class.php ( 12.26 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Storage.class.php ( 1.37 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Storage/Driver/File.class.php ( 3.52 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Mode/common.php ( 2.82 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Common/functions.php ( 53.56 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Hook.class.php ( 4.01 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/App.class.php ( 13.49 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Dispatcher.class.php ( 14.79 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Route.class.php ( 13.36 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Controller.class.php ( 11.23 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/View.class.php ( 7.59 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Behavior/BuildLiteBehavior.class.php ( 3.68 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Behavior/ParseTemplateBehavior.class.php ( 3.88 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Behavior/ContentReplaceBehavior.class.php ( 1.91 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Conf/convention.php ( 11.15 KB )
- /www/wwwroot/tsicrk.com/App/Common/Conf/config.php ( 2.14 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Lang/zh-cn.php ( 2.55 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Conf/debug.php ( 1.49 KB )
- /www/wwwroot/tsicrk.com/App/Home/Conf/config.php ( 0.31 KB )
- /www/wwwroot/tsicrk.com/App/Home/Common/function.php ( 3.33 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Behavior/ReadHtmlCacheBehavior.class.php ( 5.62 KB )
- /www/wwwroot/tsicrk.com/App/Home/Controller/ArticleController.class.php ( 6.02 KB )
- /www/wwwroot/tsicrk.com/App/Home/Controller/CommController.class.php ( 1.60 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Model.class.php ( 60.11 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Db.class.php ( 32.43 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Db/Driver/Pdo.class.php ( 16.74 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Cache.class.php ( 3.83 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Cache/Driver/File.class.php ( 5.87 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Template.class.php ( 28.16 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Template/TagLib/Cx.class.php ( 22.40 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Template/TagLib.class.php ( 9.16 KB )
- /www/wwwroot/tsicrk.com/App/Runtime/Cache/Home/7540f392f42b28b481b30614275e4e55.php ( 17.71 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Behavior/WriteHtmlCacheBehavior.class.php ( 0.97 KB )
- /www/wwwroot/tsicrk.com/ThinkPHP/Library/Behavior/ShowPageTraceBehavior.class.php ( 5.24 KB )
- [ app_init ] --START--
- Run Behavior\BuildLiteBehavior [ RunTime:0.000005s ]
- [ app_init ] --END-- [ RunTime:0.000032s ]
- [ app_begin ] --START--
- Run Behavior\ReadHtmlCacheBehavior [ RunTime:0.000327s ]
- [ app_begin ] --END-- [ RunTime:0.000350s ]
- [ view_parse ] --START--
- [ template_filter ] --START--
- Run Behavior\ContentReplaceBehavior [ RunTime:0.001266s ]
- [ template_filter ] --END-- [ RunTime:0.001307s ]
- Run Behavior\ParseTemplateBehavior [ RunTime:0.015358s ]
- [ view_parse ] --END-- [ RunTime:0.015395s ]
- [ view_filter ] --START--
- Run Behavior\WriteHtmlCacheBehavior [ RunTime:0.000214s ]
- [ view_filter ] --END-- [ RunTime:0.000234s ]
- [ app_end ] --START--
- 1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1
[ SQL语句 ] : SELECT `id`,`pid`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1
- 1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1
[ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1
- 1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1
[ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( pid= )
- [8] Undefined index: pid /www/wwwroot/tsicrk.com/App/Home/Controller/ArticleController.class.php 第 47 行.
- [8] Undefined index: db_host /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Db.class.php 第 120 行.
- [8] Undefined index: db_port /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Db.class.php 第 121 行.
- [8] Undefined index: db_name /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Db.class.php 第 122 行.

0.9840s
