本文实例为大家分享了javaweb购物车案列的具体代码，供大家参考，具体内容如下
一、项目目录结构
二、源代码
dao包——dao层：bookdao.java
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package com.dao;
import java.util.map;
import com.db.db;
import com.domain.book;
public class bookdao {
public map getall(){
return db.getall();
}
public book find(string id){
return (book) db.getall().get(id);
}
}
db包：db.java——模拟数据库
package com.db;
import java.util.linkedhashmap;
import java.util.map;
import com.domain.book;
import com.sun.org.apache.bcel.internal.generic.new;
//代表数据库
//代表数据库
public class db {
private static map map = new linkedhashmap();
static{
map.put("1", new book("1","javaweb开发","老张",38,"一本好书"));
map.put("2", new book("2","jdbc开发","老黎",18,"一本好书"));
map.put("3", new book("3","ajax开发","老佟",328,"一本好书"));
map.put("4", new book("4","jbpm开发","老毕",58,"一本好书"));
map.put("5", new book("5","struts开发","老方",28,"一本好书"));
map.put("6", new book("6","spring开发","老方",98,"一本好书"));
}
public static map getall(){
return map;
}
}
domain包：
book.java:书的实体类
package com.domain;
//书的实体类
public class book {
private string id;
private string name;
private string author;
private double price;
private string description;
public book() {
super();
// todo auto-generated constructor stub
}
public book(string id, string name, string author, double price,
string description) {
super();
this.id = id;
this.name = name;
this.author = author;
this.price = price;
this.description = description;
}
public string getid() {
return id;
}
public void setid(string id) {
this.id = id;
}
public string getname() {
return name;
}
public void setname(string name) {
this.name = name;
}
public string getauthor() {
return author;
}
public void setauthor(string author) {
this.author = author;
}
public double getprice() {
return price;
}
public void setprice(double price) {
this.price = price;
}
public string getdescription() {
return description;
}
public void setdescription(string description) {
this.description = description;
}
}
cart.java：购物车类
package com.domain;
import java.util.linkedhashmap;
import java.util.map;
//代表用户的购物车
//代表用户的购物车
public class cart {
private map<string,cartitem> map = new linkedhashmap();
private double price; //记住购物车所有商品多少钱
public void add(book book){
//看购物车中有没有，要添加的书对应的购物项
cartitem item = map.get(book.getid());
if(item==null){
item = new cartitem();
item.setbook(book);
item.setquantity(1);
map.put(book.getid(), item);
}else{
item.setquantity(item.getquantity()+1);
}
}
public map<string, cartitem> getmap() {
return map;
}
public void setmap(map<string, cartitem> map) {
this.map = map;
}
public double getprice() {
double totalprice = 0;
for(map.entry<string, cartitem> entry : map.entryset()){
cartitem item = entry.getvalue();
totalprice += item.getprice();
}
this.price = totalprice;
return price;
}
public void setprice(double price) {
this.price = price;
}
}
cartitem.java:购物项
package com.domain;
//用于代表某个商品，以及商品出现的次数（购物项）
public class cartitem {
private book book;
private int quantity;
private double price;
public book getbook() {
return book;
}
public void setbook(book book) {
this.book = book;
}
public int getquantity() {
return quantity;
}
public void setquantity(int quantity) {
this.quantity = quantity;
this.price = this.book.getprice() * this.quantity;
}
public double getprice() {
return price;
}
public void setprice(double price) {
this.price = price;
}
}
service包：service层
businessservice.java:
package com.service;
import java.util.map;
import com.dao.bookdao;
import com.domain.book;
import com.domain.cart;
import com.domain.cartitem;
//业务类，统一对web层提供所有服务
public class businessservice {
private bookdao dao = new bookdao();
public map getallbook(){
return dao.getall();
}
public book findbook(string id){
return dao.find(id);
}
//删除购物车中的购物项
public void deletecartitem(string id, cart cart) {
cart.getmap().remove(id);
}
//清空购物车
public void clearcart(cart cart) {
cart.getmap().clear();
}
//改变购物项的数量
public void changeitemquantity(string id, string quantity, cart cart) {
cartitem item = cart.getmap().get(id);
item.setquantity(integer.parseint(quantity));
}
}
web层：
listbookservlet.java:显示所有书籍
package com.web.controller;
import java.io.ioexception;
import java.io.printwriter;
import java.util.map;
import javax.servlet.servletexception;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import com.service.businessservice;
//获取所有书籍
//获取所有书
public class listbookservlet extends httpservlet {
public void doget(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
businessservice service = new businessservice();
map map = service.getallbook();
request.setattribute("map", map);
request.getrequestdispatcher("/web-inf/jsp/listbook.jsp").forward(request, response);
}
public void dopost(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
doget(request, response);
}
}
buyservlet.java：处理购买请求
package com.web.controller;
import java.io.ioexception;
import javax.servlet.servletexception;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import com.domain.book;
import com.domain.cart;
import com.service.businessservice;
//完成书籍购买
//完成书籍购买
public class buyservlet extends httpservlet {
public void doget(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
string id = request.getparameter("id");
businessservice service = new businessservice();
book book = service.findbook(id);
//得到用户的购物车
cart cart = (cart) request.getsession().getattribute("cart");
if(cart==null){
cart = new cart();
request.getsession().setattribute("cart", cart);
}
//把书加到用户购物车中,完成购买
cart.add(book);
//response.sendredirect("/web-inf/jsp/listcart.jsp");
request.getrequestdispatcher("/web-inf/jsp/listcart.jsp").forward(request, response);
}
public void dopost(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
doget(request, response);
}
}
deleteitemservlet.java:删除某一种商品
package com.web.controller;
import java.io.ioexception;
import javax.servlet.servletexception;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import com.domain.cart;
import com.service.businessservice;
//删除指定的购物项
public class deleteitemservlet extends httpservlet {
public void doget(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
string id = request.getparameter("id");
cart cart = (cart) request.getsession().getattribute("cart");
businessservice service = new businessservice();
service.deletecartitem(id,cart);
//删除成功
request.getrequestdispatcher("/web-inf/jsp/listcart.jsp").forward(request, response);
}
public void dopost(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
doget(request, response);
}
}
clearcartservlet.java:清空购物车
package com.web.controller;
import java.io.ioexception;
import java.io.printwriter;
import javax.servlet.servletexception;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import com.domain.cart;
import com.service.businessservice;
//清空购物车
public class clearcartservlet extends httpservlet {
public void doget(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
cart cart = (cart) request.getsession().getattribute("cart");
businessservice service = new businessservice();
service.clearcart(cart);
request.getrequestdispatcher("/web-inf/jsp/listcart.jsp").forward(request, response);
}
public void dopost(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
doget(request, response);
}
}
changequantityservlet.java:修改购物车中指定商品的数量
package com.web.controller;
import java.io.ioexception;
import java.io.printwriter;
import javax.servlet.servletexception;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import com.domain.cart;
import com.service.businessservice;
//把购物车中的书修改为指定数量
public class changequantityservlet extends httpservlet {
public void doget(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
string id = request.getparameter("id");
string quantity = request.getparameter("quantity");
cart cart = (cart) request.getsession().getattribute("cart");
businessservice service = new businessservice();
service.changeitemquantity(id,quantity,cart);
request.getrequestdispatcher("/web-inf/jsp/listcart.jsp").forward(request, response);
}
public void dopost(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
doget(request, response);
}
}
jsp页面：
webroot/web-inf/jsp/listbook.jsp:显示书籍列表
<%@ page language="java" import="java.util.*" pageencoding="utf-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!doctype html public "-//w3c//dtd html 4.01 transitional//en">
<html>
<head>
<title>书籍列表页面</title>
</head>
<body style="text-align: center">
<h1>书籍列表</h1>
<table width="70%" border="1">
<tr>
<td>书名</td>
<td>作者</td>
<td>售价</td>
<td>描述 </td>
<td>操作</td>
</tr>
<c:foreach var="entry" items="${map}">
<tr>
<td>${entry.value.name }</td>
<td>${entry.value.author }</td>
<td>${entry.value.price }</td>
<td>${entry.value.description } </td>
<td>
<a href="${pagecontext.request.contextpath }/servlet/buyservlet?id=${entry.value.id }" rel="external nofollow" target="_blank">购买</a>
</td>
</tr>
</c:foreach>
</table>
</body>
webroot/web-inf/jsp/listcart.jsp：显示购物车列表
<%@ page language="java" import="java.util.*" pageencoding="utf-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!doctype html public "-//w3c//dtd html 4.01 transitional//en">
<html>
<head>
<title>购物车列表</title>
<script type="text/javascript">
function deleteitem(id){
var b = window.confirm("您确认删除吗？？");
if(b){
window.location.href="${pagecontext.request.contextpath }/servlet/deleteitemservlet?id=" rel="external nofollow" +id;
}
}
function clearcart(){
var b = window.confirm("您确认清空吗？？");
if(b){
window.location.href="${pagecontext.request.contextpath}/servlet/clearcartservlet" rel="external nofollow" ;
}
}
function changequantity(input,id,oldvalue){
var quantity = input.value; //得到要修改的数量 sdfsfs
/*
//检查用户输入的数量是不是一个数字
if(isnan(quantity)){
alert("请输入数字！！");
input.value = oldvalue;
return;
}
*/
//检查用户输入的数量是不是一个正整数
if(quantity<0 || quantity!=parseint(quantity)){
alert("请输入正整数！！");
input.value = oldvalue;
return;
}
var b = window.confirm("您确认把书的数量修改为:" + quantity);
if(b){
window.location.href="${pagecontext.request.contextpath}/servlet/changequantityservlet?id=" rel="external nofollow" + id + "&quantity=" + quantity;
}
}
</script>
</head>
<body style="text-align: center">
<h1>购物车列表</h1>
<c:if test="${empty(cart.map)}">
您没有购买任何商品！！！
</c:if>
<c:if test="${!empty(cart.map)}">
<table width="70%" border="1">
<tr>
<td>书名</td>
<td>作者</td>
<td>单价</td>
<td>数量 </td>
<td>小计</td>
<td>操作</td>
</tr>
<c:foreach var="entry" items="${cart.map}">
<tr>
<td>${entry.value.book.name }</td>
<td>${entry.value.book.author }</td>
<td>${entry.value.book.price }</td>
<td>
<input type="text" name="quantity" value="${entry.value.quantity }" style="width:35px" onchange="changequantity(this,${entry.key},${entry.value.quantity})">
</td>
<td>${entry.value.price }</td>
<td>
<a href="javascript:void(0)" rel="external nofollow" rel="external nofollow" onclick="deleteitem(${entry.key })">删除</a> <!-- 去掉超链接默认行为 -->
</td>
</tr>
</c:foreach>
<tr>
<td colspan="3">总价</td>
<td colspan="2">${cart.price }元</td>
<td colspan="1">
<a href="javascript:void(0)" rel="external nofollow" rel="external nofollow" onclick="clearcart()">清空购物车</a>
</td>
</tr>
</table>
</c:if>
</body>
</html>
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