如何用java和jsp做一个简单的购物车
展开全部
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> > 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="${item.proImg }" height="50" width="30" /><a href="Product?action=view&entityId=${item.proId}">${item.proName}</a></td>
<td class="price" id="price_id_1">
<span><fmt:formatNumber value="${item.proPrice}" type="NUMBER" minFractionDigits="2" /></span>
<input type="hidden" value="${item.proPrice}" />
</td>
<td class="number">
<dl>
<dt><span onclick="sub('number_id_${item.proId}','${item.proId}')">－</span><input id="number_id_${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 © 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
List<Items> shopCar = (List<Items>)req.getSession().getAttribute("shopCar");
if(null == shopCar){
//购物车
shopCar = new ArrayList<Items>();
}
//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
List<Items> shopCar = (List<Items>) 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
List<Items> shopCar = (List<Items>) 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);
}
}
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