本文目录一览：
- 1、用jsp和数据库做购物车，怎么能通过点击按钮把购买数量和商品信息传给购物车页面，急！！下面是部分代码
- 2、javascript+jsp实现在1.html把商品放购物车,在2.html显示购物车内的信息.看问题补充
- 3、如何用java和jsp做一个简单的购物车
- 4、jsp 实现简易版session购物车,无论前面怎么选择，最后显示的结果都为6个on，无法正确显示选择结果
用jsp和数据库做购物车，怎么能通过点击按钮把购买数量和商品信息传给购物车页面，急！！下面是部分代码
你把购买的数量和商品信息做成一个javabean，然后把这个javabean存在session里面，你点击按钮就向服务器端发出请求，然后服务器端处理请求后用jsp显示，这样就可以了呀
javascript+jsp实现在1.html把商品放购物车,在2.html显示购物车内的信息.看问题补充
一般来说，购物车信息是放在数据库的。不建议放在session。添加购物车就向数据库添加一条数据，另外一个页面刷新自然就可以获取数据
如何用java和jsp做一个简单的购物车
页面jsp ：
%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%
%@ taglib prefix="c" uri="
%@ taglib uri="
!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "
html xmlns="
head
meta http-equiv="Content-Type" content="text/html; charset=utf-8" /
title易买网 - 首页/title
link type="text/css" rel="stylesheet" href="${pageContext.request.contextPath }/css/style.css" /
script type="text/javascript" src="${pageContext.request.contextPath }/js/jquery-2.1.1.js"/script
script type="text/javascript"
var contextPath = '${pageContext.request.contextPath }';
/script
script type="text/javascript" src="${pageContext.request.contextPath }/js/shopping.js"/script
/head
body
jsp:include page="top.jsp" /
div id="position" class="wrap"
您现在的位置：a href="Home"易买网/a gt; 购物车
/div
div class="wrap"
div id="shopping"
form action="" method="post"
table
tr
th商品名称/th
th商品价格/th
th购买数量/th
th操作/th
/tr
c:forEach items="${sessionScope.shopCar}" var="item" varStatus="status"
tr id="product_id_${item.proId}"
td class="thumb"img src="${item.proImg }" height="50" width="30" /a href="Product?action=viewentityId=${item.proId}"${item.proName}/a/td
td class="price" id="price_id_1"
spanfmt:formatNumber value="${item.proPrice}" type="NUMBER" minFractionDigits="2" //span
input type="hidden" value="${item.proPrice}" /
/td
td class="number"
dl
dtspan onclick="sub('number_id_${item.proId}','${item.proId}')"－/spaninput id="number_id_${item.proId}" type="text" readonly="readonly" name="number" value="${item.proNum}" /span onclick="addNum('number_id_${item.proId}','${item.proId}')"＋/span/dt
/dl
/td
td class="delete"a href="javascript:deleteItem('product_id_${item.proId}','${item.proId}')"删除/a/td
/tr
/c:forEach
/table
div class="button"input type="submit" value="" //div
/form
/div
/div
div id="footer"
Copyright copy; kaka 292817678 itjob 远标培训.
/div
/body
/html
页面关联的js 自己去网上下载一个jquery
/*数量减少*/
function sub(id,proId){
//购买数量的值
var num = $('#'+id).val();
if(num 1){
$('#'+id).val(num - 1);
}
edit(id,proId);
}
function edit(id,proId){
var url = contextPath + '/HomeCarManager';
//修改后的数量，购物明细的商品的id
num = $('#'+id).val();
$.post(url,{"num":num,"proId":proId},function (msg){
/*
if(msg == 'true'){
alert('修改成功');
} else {
alert('修改失败');
}*/
});
}
/**
* 数量增加
* @param {} id
*/
function addNum(id,proId){
//购买数量的值
var num = $('#'+id).val();
$('#'+id).val(parseInt(num) + 1);
edit(id,proId);
}
/**
* 删除购物明细
*/
function deleteItem(trId,proId){
//
//console.log($("#"+trId));
//js删除页面节点
//$("#"+trId).remove();
var url = contextPath + '/HomeCarManager';
$.post(url,{"proId":proId},function (msg){
if(msg == 'true'){
//js删除页面节点
$("#"+trId).remove();
}
});
}
后台servlet1
package com.kaka.web;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* 购物车处理类
* @author @author ITJob 远标培训
*
*/
import com.kaka.entity.Items;
import com.kaka.entity.Product;
import com.kaka.service.ProductService;
import com.kaka.service.impl.ProductServiceImpl;
public class HomeCar extends HttpServlet {
private static final long serialVersionUID = 1L;
ProductService ps = new ProductServiceImpl();
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//获取商品的id
String proId = req.getParameter("proId");
resp.setContentType("text/html;charset=UTF-8");
PrintWriter writer = resp.getWriter();
if(null != proId !"".equals(proId)){
//返回添加购物车成功
//System.out.println("=============" + proId);
//根据商品的id查询商品
try {
Integer pId = Integer.parseInt(proId);
Product product = ps.findProductById(pId);
if(null != product){
//查询到了商品，将商品的相关参数构建一个购物明细放入到购物车
Items it = new Items();
it.setProId(product.getProId());
it.setProName(product.getProName());
it.setProPrice(product.getProPrice());
it.setProImg(product.getProImg());
//先判断session范围是否有购物车
ListItems shopCar = (ListItems)req.getSession().getAttribute("shopCar");
if(null == shopCar){
//购物车
shopCar = new ArrayListItems();
}
//将商品加入到购物车之前，判断购物车中是否已经包含了该购物明细，如果包含了，只需要修改购买的数量
if(shopCar.contains(it)){
int index = shopCar.indexOf(it);//寻找购物车中包含购物明细在购物车中位置
Items items = shopCar.get(index);//获取购物车中存在的购物明细
items.setProNum(items.getProNum()+1);
} else {
shopCar.add(it);
}
//将购物车放入到session访问
req.getSession().setAttribute("shopCar", shopCar);
//返回
writer.print(true);
} else {
writer.print(false);
}
} catch (Exception e) {
e.printStackTrace();
writer.print(false);
}
} else {
writer.print(false);
}
writer.flush();
writer.close();
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
}
后台管理servlet
package com.kaka.web;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import javax.mail.FetchProfile.Item;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* 购物车修改
* @author ITJob 远标培训
*
*/
import com.kaka.entity.Items;
import com.kaka.entity.Product;
import com.kaka.service.ProductService;
import com.kaka.service.impl.ProductServiceImpl;
public class HomeCarManager extends HttpServlet {
private static final long serialVersionUID = 1L;
ProductService ps = new ProductServiceImpl();
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.setContentType("text/html;charset=UTF-8");
PrintWriter writer = resp.getWriter();
//获取参数
String proId = req.getParameter("proId");
String num = req.getParameter("num");
if(null != proId null != num
!"".equals(proId) !"".equals(num)){
try {
Integer pId = Integer.parseInt(proId);
Float pNum = Float.parseFloat(num);
//根据商品的id获取对应的明细项
// 先判断session范围是否有购物车
ListItems shopCar = (ListItems) req.getSession().getAttribute("shopCar");
for(Items it : shopCar){
if(it.getProId()== pId){
it.setProNum(pNum);
}
}
writer.print(true);
} catch (Exception e) {
e.printStackTrace();
}
} else {
//删除的操作
try {
Integer pId = Integer.parseInt(proId);
//根据商品的id获取对应的明细项
// 先判断session范围是否有购物车
ListItems shopCar = (ListItems) req.getSession().getAttribute("shopCar");
Items items = null;
for(Items it : shopCar){
if(it.getProId()== pId){
items = it;
break;
}
}
if(null != items){
shopCar.remove(items);
req.getSession().setAttribute("shopCar",shopCar);
}
writer.print(true);
} catch (Exception e) {
e.printStackTrace();
}
}
writer.flush();
writer.close();
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
}
jsp 实现简易版session购物车,无论前面怎么选择，最后显示的结果都为6个on，无法正确显示选择结果
session.setAttribute（这个里面放List），
你有多少个商品全放在list里面就行了。
然后购物车展示页面就循环输出list
