用JSP的Session 机制编写的程序就可以是你拥有一个功能强大购物车程序,是不是很诱人呢?赶紧开始我们的程序吧

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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
- {
- Goods shop = (Goods)it.next();
◆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 : 2026-02-22 16:02:27 HTTP/1.1 GET : /article/cdoihoe.html
- 运行时间 : 0.0660s ( Load:0.0045s Init:0.0006s Exec:0.0567s Template:0.0043s )
- 吞吐率 : 15.15req/s
- 内存开销 : 2,235.14 kb
- 查询信息 : 12 queries 5 writes
- 文件加载 : 36
- 缓存信息 : 0 gets 2 writes
- 配置加载 : 130
- 会话信息 : SESSION_ID=qthjmjc2iiufs4gnu31pfkck76
- /home/wwwroot/jxjierui.cn/index.php ( 1.12 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/ThinkPHP.php ( 4.61 KB )
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- /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Storage.class.php ( 1.37 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Storage/Driver/File.class.php ( 3.52 KB )
- /home/wwwroot/jxjierui.cn/ThinkPHP/Mode/common.php ( 2.82 KB )
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- /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/BuildLiteBehavior.class.php ( 3.68 KB )
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- /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php ( 32.43 KB )
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- [ app_init ] --START--
- Run Behavior\BuildLiteBehavior [ RunTime:0.000005s ]
- [ app_init ] --END-- [ RunTime:0.000026s ]
- [ app_begin ] --START--
- Run Behavior\ReadHtmlCacheBehavior [ RunTime:0.000161s ]
- [ app_begin ] --END-- [ RunTime:0.000176s ]
- [ view_parse ] --START--
- [ template_filter ] --START--
- Run Behavior\ContentReplaceBehavior [ RunTime:0.000049s ]
- [ template_filter ] --END-- [ RunTime:0.000066s ]
- Run Behavior\ParseTemplateBehavior [ RunTime:0.003393s ]
- [ view_parse ] --END-- [ RunTime:0.003407s ]
- [ view_filter ] --START--
- Run Behavior\WriteHtmlCacheBehavior [ RunTime:0.000060s ]
- [ view_filter ] --END-- [ RunTime:0.000069s ]
- [ 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 /home/wwwroot/jxjierui.cn/App/Home/Controller/ArticleController.class.php 第 47 行.
- [2] file_put_contents(./App/Runtime/Temp/876d4804c794164bc75b3b9afa74160e.php): failed to open stream: Permission denied /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 132 行.
- [8] Undefined index: db_host /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 120 行.
- [8] Undefined index: db_port /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 121 行.
- [8] Undefined index: db_name /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 122 行.
- [2] file_put_contents(./App/Runtime/Temp/1a73346b12faf96c4671687b2fb7f102.php): failed to open stream: Permission denied /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 132 行.

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