web购物车代码？移动web开发
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jsp网上购物代码及操作!
1.index.jsp登陆界面：
<%@ page language="java" import="java.util.*" pageEncoding="GB2312"%>
<%
String path= request.getContextPath();
String basePath= request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%session.invalidate();%><%--销毁所有session对象--%>
<!DOCTYPE HTML PUBLIC"-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" href="<%=basePath%>">
<title>购物车</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">
<!--
<link rel="stylesheet" type="text/css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" href="styles.css">
-->
</head>
<body>
<center>
<hr>
请输入用户名，默认的为Guest
<form action="checklogin.jsp" mothod=get>
<table width="40%" border="1">
<tr bgcolor="#336600">
<td><div align="center"><font color="FFFFFF">用户登陆</font></div></td>
</tr>
<tr align="center" bgcolor="#CCCCCC">
<td>用户名：<input type="password" name="userID"></td>
</tr>
<tr align="center" bgcolor="#CCCCCC">
<td>口令：<input type="password" name="password"></td>
</tr>
<tr align="center" bgcolor="#CCCCCC">
<td><input type="submit" value="登陆"></td>
</tr>
</table>
</form>
</center>
</body>
</html>
2.checklogin.jsp登陆认证页面：
<%@ page language="java" import="java.util.*" pageEncoding="GB2312"%>
<%
String path= request.getContextPath();
String basePath= request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<jsp:useBean id="Car" class="web.Car" scope="session">
<jsp:setProperty property="*" name="Car"/>
</jsp:useBean>
<%session.setMaxInactiveInterval(900);%><%--设置session超时为30分--%>
<!DOCTYPE HTML PUBLIC"-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" href="<%=basePath%>">
<title>My JSP'checklogin.jsp' starting page</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">
<!--
<link rel="stylesheet" type="text/css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" href="styles.css">
-->
</head>
<body>
<%
String nextpage;
if(Car.getUserID().equals("Guest"))
nextpage="car.jsp";
else
nextpage="index.jsp";
%>
<jsp:forward page="<%=nextpage%>"></jsp:forward>
</body>
</html>
3.car.jsp购物车页面
<%@ page language="java" import="java.util.*" pageEncoding="GB2312"%>
<%
String path= request.getContextPath();
String basePath= request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ page import="java.util.*"%>
<%@ page import="web.Car"%>
<!DOCTYPE HTML PUBLIC"-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" href="<%=basePath%>">
<title>购物车</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">
<!--
<link rel="stylesheet" type="text/css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" href="styles.css">
-->
</head>
<body>
<br><%@ include file="header.jsp"%>
<hr>
<font size="2">
<jsp:useBean id="Car" class="web.Car" scope="session">
</jsp:useBean>
<p><font color="#804040" face="楷体_GB2312">
<strong>百货商场，请尽情的选购商品添加到购物车！</strong>
</font>
<%String str=response.encodeRedirectURL("add.jsp");%>
<form action="<%=str%>" method="post" name="form">
<select name="item" value="没选择">
<option value="TV">电视机</option>
<option value="apple">苹果</option>
<option value="coke">可口可乐</option>
<option value="milk">牛奶</option>
<option value="tea">茶叶</option>
</select>
<p><font color="#804040" face="楷体_GB2312">
输入购买的数量：
</font>
<input type="text" name="mount">
<p>
<input type="radio" name="unit" value="个">个
<input type="radio" name="unit" value="公斤">公斤
<input type="radio" name="unit" value="台">台
<input type="radio" name="unit" value="瓶">瓶<p>
<input type="submit" value="提交添加">
</form>
<p><font color="#804040" face="楷体_GB2312">你的购物车里有如下商品：</font>
<font color="#FF8040" size="2">
<%
Hashtable list=Car.list_h();
Enumeration enums=list.elements();
while(enums.hasMoreElements()){
String goods=(String) enums.nextElement();
byte b[]=goods.getBytes("ISO-8859-1");
goods=new String(b);
out.println("<br>"+goods);
}
%>
</font>
<% String strl=response.encodeRedirectURL("selectRemoveGoods.jsp");%>
<form action="<%=strl%>" method="post" name="form">
<input type="submit" value="修改购物车中的商品">
</form>
</font>
<%@ include file="tail.jsp"%>
</body>
</html>
4.add.jsp增加物品：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
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 rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" href="<%=basePath%>">
<title>购物车</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">
<!--
<link rel="stylesheet" type="text/css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" href="styles.css">
-->
</head>
<body>
<%@ include file="header.jsp"%>
<hr>
<font size="2">
<jsp:useBean id="Car" class="web.Car" scope="session"></jsp:useBean><br>
<jsp:setProperty name="Car" property="*"/>
<%Car.add_h();%>
<font face="楷体_GB2312">
<font color="#FF8040" size="2">
<p>您的购物车有如下商品：
<%
Hashtable list=Car.list_h();
Enumeration enums=list.elements();
while(enums.hasMoreElements()){
String goods=(String) enums.nextElement();
byte b[]=goods.getBytes("ISO-8859-1");
goods=new String(b);
out.println("<br>"+goods);
}
%>
</font>
<%String str=response.encodeRedirectURL("car.jsp");%>
<br>
<form action="<%=str%>" method="post" neme="form">
<input type="submit" value="继续购物">
</form>
<%String strl=response.encodeRedirectURL("selectRemoveGoods.jsp");%>
<br>
<form action="<%=strl%>" method="post" neme="form">
<input type="submit" value="修改购物车中的物品">
</form>
</font>
</font>
<%@ include file="tail.jsp"%>
</body>
</html>
5.selectRemoveGoods.jsp选择删除商品：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path= request.getContextPath();
String basePath= request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ page import="java.util.*"%>
<%@ page import="web.Car"%>
<!DOCTYPE HTML PUBLIC"-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" href="<%=basePath%>">
<title>购物</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">
<!--
<link rel="stylesheet" type="text/css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" href="styles.css">
-->
</head>
<body>
<br><%@ include file="header.jsp"%>
<hr>
<jsp:useBean id="Car" class="web.Car" scope="session">
</jsp:useBean><br>
<p>选择从购物车中删除的物品：
<%String str=response.encodeRedirectURL("removeWork.jsp");%>
<form action="<%=str%>" method="post" name="form">
<select name="deleteitem" size="1">
<option value="TV">电视机</option>
<option value="apple">苹果</option>
<option value="coke">可口可乐</option>
<option value="milk">牛奶</option>
<option value="tea">茶叶</option>
</select>
<input type="submit" value="提交删除">
</form>
<font face="楷体_GB2312">
<font color="#FF8040" size="2">
<p>您的购物车有如下商品：
<%
Hashtable list=Car.list_h();
Enumeration enums=list.elements();
while(enums.hasMoreElements()){
String goods=(String) enums.nextElement();
byte b[]=goods.getBytes("ISO-8859-1");
goods=new String(b);
out.println("<br>"+goods);
}
%>
</font></font>
<%String strl=response.encodeRedirectURL("car.jsp");%>
<form action="<%=strl%>" method="post" neme="form">
<input type="submit" value="继续购物">
</form>
<%@include file="tail.jsp"%>
</body>
</html>
6.removeWork.jsp删除页面：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path= request.getContextPath();
String basePath= request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ page import="java.util.*"%>
<%@ page import="web.Car"%>
<!DOCTYPE HTML PUBLIC"-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" href="<%=basePath%>">
<title>购物车</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">
<!--
<link rel="stylesheet" type="text/css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" href="styles.css">
-->
</head>
<body>
<%@include file="header.jsp"%>
<hr>
<font size="2">
<jsp:useBean id="Car" class="web.Car" scope="session">
</jsp:useBean><br>
<%String str=response.encodeRedirectURL("removeWork.jsp");%>
<%String name=request.getParameter("deleteitem");
if(name==null)
name="";
byte c[]=name.getBytes("ISO-8859-1");
name=new String(c);
Car.dele_h(name);
out.println("您删除了货物"+name);%>
</font>
<font face="楷体_GB2312">
<font color="#FF8040" size="2">
<p>您的购物车有如下商品：
<%
Hashtable list=Car.list_h();
Enumeration enums=list.elements();
while(enums.hasMoreElements()){
String goods=(String) enums.nextElement();
byte b[]=goods.getBytes("ISO-8859-1");
goods=new String(b);
out.println("<br>"+goods);
}
%>
</font></font>
<%String strp=response.encodeRedirectURL("car.jsp");%>
<form action="<%=strp%>" method="post" neme="form">
<input type="submit" value="继续购物">
</form>
<%String strl=response.encodeRedirectURL("selectRemoveGoods.jsp");%>
<form action="<%=strl%>" method="post" neme="form">
<input type="submit" value="修改购物车中的物品">
</form>
</body>
</html>
7.header.jsp页面头部：
<%@ page language="java" import="java.util.*" pageEncoding="GB2312"%>
<center>
========================================================================<br>
购物车系统<br>
=======================================================================<br>
WELCOME！
<jsp:getProperty name="Car" property="userID"/>
当前时间是：
<%=new java.util.Date().toLocaleString()%>
<br>
</center>
8.tail页面尾部
<%@ page language="java" import="java.util.*" pageEncoding="GB2312"%>
<center>
<hr>
JSP+TOMCAT购物系统
</center>
9.Car.java类
package web;
import java.util.*;
import java.io.*;
public class Car implements Serializable{
Hashtable list=new Hashtable();//散列表，商品列表
String item="Welcome";
int mount=0;//商品数量
String unit=null;//商品单位
String userID;//用户
public void Car(){
}
public void setItem(String item){
this.item= item;
}
public void setMount(int mount){
this.mount= mount;
}
public void setUnit(String unit){
this.unit= unit;
}
public String getUserID(){
return userID;
}
public void setUserID(String userID){
this.userID= userID;
}
public Hashtable list_h(){
return list;
}
public void dele_h(String s){
list.remove(s);
}
public void add_h(){
String str="Name:"+item+"Mount:"+mount+"Unit:"+unit;
list.put(item, str);
}
}
javaweb购物车第二次订单失效
javaweb购物车第二次订单失效原因是数据库操作问题。根据查询相关公开信息显示，如果订单信息没有正确保存到数据库中，或者数据库操作出现异常，会导致订单失效。可以在代码中添加异常处理和日志记录，以便发生问题时进行排查。JavaWEB的在线电子书商城，实际上就是销售企业为消费者提供的网上购物商城，在该网站中用户可以购买任何商品，而管理员可以对商品和订单等信息进行管理。
求推荐一个web前端的学习路线
web前端作为互联网相关的重要岗位，许多互联网大厂（如阿里腾讯等）在招聘时会作出要求。学好web前端对于将来掌握前端后端开发、成为全栈架构师的学习很有帮助。
想学习web前端需要掌握的内容也是不少的，对于自学的同学来说会有一些难度，不推荐自学能力差的人。我们在学习的时候需要分阶段进行，做到有计划的学习与训练，具体的学习顺序如下：
web前端学习顺序：
①计算机基础以及PS基础
②前端开发基础（HTML5开发、JavaScript基础到高级、jQuery网页特效、Bootstrap框架）
③移动开发
④前端高级开发（ECMAScript6、Veu.js框架开发、webpack、前端页面优化、React框架开发、AngularJS 2.0框架开发等）
⑤小程序开发
⑥全栈开发（MySQL数据库、Python编程语言、Django框架等）
⑦就业拓展（网站SEO与前端安全技术）
想要系统学习，你可以考察对比一下开设有IT专业的热门学校，好的学校拥有根据当下企业需求自主研发课程的能力，建议实地考察对比一下。
祝你学有所成，望采纳。
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