欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

javaweb购物车案列学习开发

程序员文章站 2023-12-18 22:12:58
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:bo...

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  

 javaweb购物车案列学习开发

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。

上一篇:

下一篇: