Javaweb MVC+dao实现简单购物车(实验)-Toy模板网

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本篇文章给大家分享一下简单购物车的实现。含商品图片、清空购物车、指定数量增加、结算。
代码放网盘里了，需要自取。注意是登录注册+购物车的，这两个实际运行是分开的，登录注册需运行user_login.jsp，购物车需运行cart.jsp。提取码：poem

首先给出截图，需要建这些文件，不会建的可以参考我servlet处理用户表单这篇文章的截图。黑线划掉的是登录注册页面，我的购物车跟登录注册界面没有连，只是在一个文件夹放着，不用建划掉的。

使用mvc模式写购物车,组件技术,mvc,servlet,java

数据库

1、打开mysql服务（管理员打开），确保数据库已经连接好。
使用mvc模式写购物车,组件技术,mvc,servlet,java
数据库连不上、不知道怎么操作，可以看看这篇文章。
2、连接成功，创建表goods，设计表如下，user不用创建！！！

3、数据库表里的商品可以写自己需要的，picture_url这里不要改，只是一个地址。如果要改图片，就把images里的图片命名为*.jpg（把自己的需要的照片放到WebRoot\WebContent\images这个文件夹里，然后重命名）。也有其他的方法，这里只写这一种。

商品的信息都是要在数据库里修改的，所以数据库里是要写东西的。

使用mvc模式写购物车,组件技术,mvc,servlet,java
下图是路径和我放的图片，可以参考一下。可能有朋友发现我这里还有一张qrcode.jpg的图，这张图是付款码，所以我没有截图。我给新手朋友的建议就是命名按我给的命名来。如果还有商品就接着这个5.jpg写6、7、8。
使用mvc模式写购物车,组件技术,mvc,servlet,java

使用mvc模式写购物车,组件技术,mvc,servlet,java

导入相应的包到WebRoot—>WebINF—>lib

只需导入下图所示第四个包即可，再点击包，Bulid Path—>Add to Bulid Path
使用mvc模式写购物车,组件技术,mvc,servlet,java
可以下载使用到的包Javaweb常用登录和注册功能实现涉及的包

在src目录下创建包（注意命名，可以不一致，创建相应的类在相应包即可，下文会详细说明）

业务接口（包名：com.qianfeng.orderfood.biz）
业务实现（包名：com.qianfeng.orderfood.bizimpl）
dao层接口（包名：com.qianfeng.orderfood.dao）
dao层实现（包名：com.qianfeng.orderfood.daoimpl）
实体（包名： com.qianfeng.orderfood.entity）
servlet服务（包名：com.qianfeng.orderfood.servlet）
工具包（包名：com.qianfeng.orderfood.util）

WebRoot–>Java Resources–>src

(1)在com.qianfeng.orderfood.biz中创建ShopBIZ.java

package com.qianfeng.orderfood.biz;
import java.util.List;

import com.qianfeng.orderfood.bizimpl.ShopBIZImpl;
import com.qianfeng.orderfood.entity.Good;
public interface ShopBIZ {

}

(2)在com.qianfeng.orderfood.bizimpl中创建ShopBIZImpl.java

package com.qianfeng.orderfood.bizimpl;

import java.util.List;

import com.qianfeng.orderfood.biz.ShopBIZ;
import com.qianfeng.orderfood.entity.Good;

public class ShopBIZImpl implements ShopBIZ {
	


}
/*
 *List<Good> getAllGoods()
 * List<Good> getAllGoodsByIds(List<String> ids)
 */

(3)在com.qianfeng.orderfood.dao中创建GoodDAO.java

package com.qianfeng.orderfood.dao;

import java.util.List;

import com.qianfeng.orderfood.entity.Good;

public interface GoodDAO {
	public  Good getGoodById(String id);
	public  List<Good> getAllGoods();
	public  List<Good> getGoodsByIds(String ids);
}

(4)在com.qianfeng.orderfood.daoimpl中创建GoodDAOImpl.java

package com.qianfeng.orderfood.daoimpl;

import java.util.ArrayList;
import java.util.List;

import com.qianfeng.orderfood.dao.GoodDAO;
import com.qianfeng.orderfood.entity.Good;
import com.qianfeng.orderfood.util.JDBCUtil;

public class GoodDAOImpl implements GoodDAO {

	@Override
	public Good getGoodById(String id) {
		java.sql.Connection connection = null;
		java.sql.PreparedStatement preparedStatement = null;
		java.sql.ResultSet resultSet = null;
		Good good=null;
		
		try {
			connection = JDBCUtil.getConnection();
			preparedStatement = connection.prepareStatement("select * from goods where id=?");
			preparedStatement.setObject(1, id);
			resultSet = preparedStatement.executeQuery();

			
			while (resultSet.next()) {
				good = new Good();
				good.setId(resultSet.getInt("id"));
				good.setGood_name(resultSet.getString("good_name"));
				good.setPrice(resultSet.getInt("price"));
				good.setPicture_url(resultSet.getString("picture_url"));
			}
		} catch (Exception e) {
			e.printStackTrace();
		}finally {
			JDBCUtil.close(resultSet, preparedStatement, connection);
		}
		return good;
	}

	@Override
	public List<Good> getAllGoods() {
		java.sql.Connection connection = null;
		java.sql.PreparedStatement preparedStatement = null;
		java.sql.ResultSet resultSet = null;
		List<Good> goods=new ArrayList<>();
		
		try {
			connection = JDBCUtil.getConnection();
			preparedStatement = connection.prepareStatement("select * from goods");
			resultSet = preparedStatement.executeQuery();			
			while (resultSet.next()) {				
				Good good = new Good();
				good.setId(resultSet.getInt("id"));
				good.setGood_name(resultSet.getString("good_name"));
				good.setPrice(resultSet.getInt("price"));
				good.setPicture_url(resultSet.getString("picture_url"));
				goods.add(good);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}finally {
			JDBCUtil.close(resultSet, preparedStatement, connection);
		}
		return goods;
	}

	@Override
	public List<Good> getGoodsByIds(String ids) {
		java.sql.Connection connection = null;
		java.sql.PreparedStatement preparedStatement = null;
		java.sql.ResultSet resultSet = null;
		List<Good> goods=null;
		
		try {
			connection = JDBCUtil.getConnection();
			preparedStatement = connection.prepareStatement("select * from goods where id in ("+ids+")");
			resultSet = preparedStatement.executeQuery();			
			while (resultSet.next()) {				
				Good good = new Good();
				good.setId(resultSet.getInt("id"));
				good.setGood_name(resultSet.getString("good_name"));
				good.setPrice(resultSet.getInt("price"));
				good.setPicture_url(resultSet.getString("picture_url"));
				goods.add(good);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}finally {
			JDBCUtil.close(resultSet, preparedStatement, connection);
		}
		return goods;
	}

	
}
/*
 *Good getGoodById(String id)
 */

(5)在com.qianfeng.orderfood.entity中创建Good.java

package com.qianfeng.orderfood.entity;

public class Good {
	private int id;
	private String good_name;
	private int price;
	private String picture_url;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getGood_name() {
		return good_name;
	}
	public void setGood_name(String good_name) {
		this.good_name = good_name;
	}
	public int getPrice() {
		return price;
	}
	public void setPrice(int price) {
		this.price = price;
	}
	public String getPicture_url() {
		return picture_url;
	}
	public void setPicture_url(String picture_url) {
		this.picture_url = picture_url;
	}
	public Good(int id, String good_name, int price, String picture_url) {
		super();
		this.id = id;
		this.good_name = good_name;
		this.price = price;
		this.picture_url = picture_url;
	}
	public Good() {
		// TODO Auto-generated constructor stub
	}
}

(6)在com.qianfeng.orderfood.servlet中创建ShoppingServlet.java

package com.qianfeng.orderfood.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class Shopping
 */
@WebServlet("/Shopping")
public class ShoppingServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public ShoppingServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.getWriter().append("Served at: ").append(request.getContextPath());
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}

(7)在com.qianfeng.orderfood.util中创建JDBCUtil.java、StringUtil.java和ValidateUtil.java，数据库密码要改成自己的

package com.qianfeng.orderfood.util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class JDBCUtil {

	//useSSL=false 是Mysql数据库的SSL连接问题，提示警告不建议使用没有带服务器身份验证的SSL连接
	private static final String driver="com.mysql.jdbc.Driver";
	//数据库名称填写自己的：这里是test
	private static final String url="jdbc:mysql://localhost:3306/test?useSSL=false&useUnicode=true&characterEncoding=utf-8";
	private static final String user="root";//mysql -u用户名 -p密码
	private static final String password="root";
	static{
		try {
			Class.forName(driver);
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
	}
	public static Connection getConnection(){
		
		try {
			return DriverManager.getConnection(url,user,password);
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return null;
		
	}
	// 查询使用的关闭
	public static void close(ResultSet resultSet,
			PreparedStatement preparedStatement, Connection connection) {
		try {
				resultSet.close();
				preparedStatement.close();
				connection.close();
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}

	// 增删查改的关闭
	public static void close(PreparedStatement preparedStatement,
			Connection connection) {
		try {
			preparedStatement.close();
			connection.close();
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}

}

package com.qianfeng.orderfood.util;

public class StringUtil {
	
	// 为何要判断NULL 和 空字符串呢？
	
	// NULL 在用户没有在请求报文中传输该KEY的时候发生
	// "" 是用户在表单没有输入数据的情况下发生
	public static boolean isEmpty(String arg){
		return arg == null || arg.equals("");
	}

	public static boolean isNotEmpty(String arg){
		return arg != null && !arg.equals("");
	}
}

package com.qianfeng.orderfood.util;

import java.util.Random;

public class ValidateUtil {

	public static String createValidateCode() {
		String temp = "1234567890qwertyuioplkjhgfdsazxcvbnm";
		StringBuilder validateCode = new StringBuilder();
		for (int i = 0; i < 4; i++) {
			validateCode.append(temp.charAt(new Random().nextInt(temp
					.length())));
		}
		return validateCode.toString();
	}

	public static void main(String[] args) {
		System.out.println(createValidateCode());
	}
}

WebRoot–>WebContent

cart.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ page import="com.qianfeng.orderfood.daoimpl.GoodDAOImpl" %>
<%@ page import="com.qianfeng.orderfood.dao.GoodDAO" %>
<%@ page import="com.qianfeng.orderfood.entity.Good" %>
    <%GoodDAO goodDAO = new GoodDAOImpl(); %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Goods List</title>

</head>
<body>
<script>
function showTotalPriceAndGoodsNum(){
	var total_num = 0;
	var total_price = 0;
	if(localStorage['cart']){
		var cart = JSON.parse(localStorage['cart'])
		for(var goodId in cart){
			console.log(goodId)
			total_num +=cart[goodId][0]
			total_price += cart[goodId][1]
			document.getElementById("cart_num_"+goodId).innerText=cart[goodId][0]
		}
	}

	
	document.getElementById("total-num").innerText=total_num
	document.getElementById("total-price").innerText=total_price
}
function addGood2Cart(id,price){

	    //获取cookie值
	if(localStorage['cart']){
		
	    var cart = JSON.parse(localStorage['cart'])
	} else{
		var cart = {}
	}
	    //将值切割成数组
	var buy_num = Number(document.getElementById("buy_num_"+id).value)
	var total_price = Number(price * document.getElementById("buy_num_"+id).value)
	if(cart[id]){
		cart[id][0] += buy_num
		cart[id][1] += total_price
	}else{
		cart[id]=[buy_num,total_price]
	}		
	localStorage['cart']=JSON.stringify(cart)
	alert("货物添加成功。");
	showTotalPriceAndGoodsNum()
	console.log(cart)
}
function clearCart(){
	localStorage['cart']=""
	var goods_nums = document.getElementsByClassName("buy_num")
	for(var id in goods_nums){
		goods_nums[id].innerText=0
	}
	showTotalPriceAndGoodsNum()
}
function deleteGood(id){
	if(localStorage['cart']){
		var cart = JSON.parse(localStorage['cart'])
		delete cart[id]
		localStorage['cart'] = JSON.stringify(cart)
	}
	document.getElementById("cart_num_"+id).innerText=0
	showTotalPriceAndGoodsNum()
}

</script>
<table>
<tr>
<td>商品</td>
<td>价格</td>
<td>实物图片</td>
<td>购物车中数量</td>
<td>购买数量</td>
<td>操作</td>
</tr>
<% for(Good good:goodDAO.getAllGoods()){
	if(good !=null){
	%>
<tr>
<td><%=good.getGood_name()%></td>
<td><%=good.getPrice()%></td>
<td><img src="<%=good.getPicture_url()%>" width="100" height="100"/></td>
<td><b id="cart_num_<%=good.getId() %>" class="buy_num"></b></td>
<td><input type="text" value="1" id="buy_num_<%=good.getId()%>"><input type="button" class="btn btn-primary" value="加入购物车" onclick="addGood2Cart(<%=good.getId()%>,<%=good.getPrice()%>)"></td>
<td><a href="#" onclick="deleteGood(<%=good.getId()%>)">删除</a></td>
</tr>

	<%}} %>
<tr>
<td>总计</td>
<td>总价:<b id="total-price"></b>元</td>
<td>共<b id="total-num"></b>件</td>
<td></td>
</tr>
</table>
<p> <a href="cart.jsp">购物车</a> &nbsp;&nbsp;&nbsp;<a href="pay.jsp" >去结算</a><br><a onclick="clearCart()" href="#">清空购物车</a></p>
<script>showTotalPriceAndGoodsNum()</script>
</body>
</html>

goods.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ page import="com.qianfeng.orderfood.daoimpl.GoodDAOImpl" %>
<%@ page import="com.qianfeng.orderfood.dao.GoodDAO" %>
<%@ page import="com.qianfeng.orderfood.entity.Good" %>
    <%GoodDAO goodDAO = new GoodDAOImpl(); %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Goods List</title>
</head>
<body>
<script>
function showTotalPriceAndGoodsNum(){
	var total_num = 0;
	var total_price = 0;
	if(localStorage['cart']){
		var cart = JSON.parse(localStorage['cart'])
		for(var goodId in cart){
			console.log(goodId)
			total_num +=cart[goodId][0]
			total_price += cart[goodId][1]
		}
	}

	
	document.getElementById("total-num").innerText=total_num
	document.getElementById("total-price").innerText=total_price
}
function addGood2Cart(id,price){

	    //获取cookie值
	if(localStorage['cart']){
		
	    var cart = JSON.parse(localStorage['cart'])
	} else{
		var cart = {}
	}
	    //将值切割成数组
	if(cart[id]){
		cart[id][0]++
		cart[id][1]+=price
	}else{
		cart[id]=[1,price]
	}
		
	localStorage['cart']=JSON.stringify( cart)
	alert("货物添加成功。");
	showTotalPriceAndGoodsNum()
	console.log(cart)
}
function clearCart(){
	localStorage['cart']=""
	showTotalPriceAndGoodsNum()
}
function deleteGood(id){
	if(localStorage['cart']){
		var cart = JSON.parse(localStorage['cart'])
		delete cart[id]
		localStorage['cart'] = JSON.stringify(cart)
	}
	showTotalPriceAndGoodsNum()
}
</script>
<table>
<tr>
<td>商品</td>
<td>价格</td>
<td>实物图片</td>
<td>购买数量</td>
<td>操作</td>
</tr>
<% for(Good good:goodDAO.getAllGoods()){
	if(good !=null){
	%>
	<tr>
<td><%=good.getGood_name()%></td>
<td><%=good.getPrice()%></td>
<td><img src="<%=good.getPicture_url()%>"></td>
<td><input type="text" value="1"><input type="button" value="更新" onclick="addGood2Cart(<%=good.getId()%>,<%=good.getPrice()%>)"></td>
<td><a href="#" onclick="deleteGood(<%=good.getId()%>)">删除</a></td>
</tr>
	
	<%}} %>
<tr>
<td>总计</td>
<td>总价:<b id="total-price"></b>元</td>
<td>共<b id="total-num"></b>件</td>
<td></td>
</tr>
</table>
<p> <a href="cart.jsp">购物车</a><br><a onclick="clearCart()" href="#">清空购物车</a></p>
<script>showTotalPriceAndGoodsNum()</script>
</body>
</html>

pay.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>付款页面</title>
</head>
<body>

<img src="images/qrcode.jpg" width="200" height="200"/>
<h2>总计<b id="total-price"></b>元，请扫码支付！</h2>
<script>	

var total_price = 0;
if(localStorage['cart']){
	var cart = JSON.parse(localStorage['cart'])
	for(var goodId in cart){
		console.log(goodId)
		total_price += cart[goodId][1]
	}
}

document.getElementById("total-price").innerText=total_price</script>
</body>
</html>

WebRoot–>WebContent–>WEB-INF

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" id="WebApp_ID" version="4.0">
  <display-name>WebRoot</display-name>
  <servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>UserLoginServlet</servlet-name>
    <servlet-class>com.qianfeng.orderfood.servlet.UserLoginServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>UserLoginServlet</servlet-name>
    <url-pattern>/UserLoginServlet</url-pattern>
  </servlet-mapping>
  <servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>UserRegisterServlet</servlet-name>
    <servlet-class>com.qianfeng.orderfood.servlet.UserRegisterServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>UserRegisterServlet</servlet-name>
    <url-pattern>/UserRegisterServlet</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
</web-app>

运行的时候要运行cart.jsp，购买数量可以填自己想要的数目，结算以“购物车中数量”这一栏为准。

使用mvc模式写购物车,组件技术,mvc,servlet,java

参考文章https://blog.csdn.net/weixin_44253375/article/details/108290462，写的时候遇到了很多问题，比如Navicat连接不上、端口号占用等等，后面把网址都总结发出来，如果遇到什么问题可以去看一下有没有一样的。文章来源地址https://www.toymoban.com/news/detail-771508.html

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