javaweb购物车案列学习开发

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

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>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。

原文链接：http://www.cnblogs.com/niuchuangfeng/p/9077503.html