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购物车(session技术实现)

夜空一星 2022-04-18 阅读 62
eclipsejavaweb
加载失败

 

目录

登录：

login.jsp

doLogin.jsp

user.java(用户实体类)

UserBizImpl.java(用户逻辑接口实现类)

IUserDao.java(用户数据访问接口)

UserDaoImpl.java(用户数据访问接口实体类)

增加购物车

goods.java(商品实体类)I

 IGoodsBiz,java(商品逻辑接口)

GoodsBizImpl.java(商品逻辑接口实现类)

IGoodsDao.java(商品数据访问接口)

GoodsDaoImpl.java(商品数据访问接口实现类)

doAdd.jsp(处理购物车的增加)

CarItem.java(商品项实体类)

数据库建表：

文件目录：

之所以选择session做购物车的登录功能是因为session是回话级存储。可以保留客户端每次发送请求的数据。相比较于数据库版的购物车，session运行的速度更快，但是也会存在相应的缺点。比如缺少安全性，针对这方面的问题，后续我们会更新内存数据库版的购物车。

购物车的主要功能：

登录：

login.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="${pageContext.request.contextPath}/bootstrap-3.3.7-dist/css/bootstrap.css">
    <script src="${pageContext.request.contextPath}/bootstrap-3.3.7-dist/js/jquery-3.5.1.js"></script>
    <script src="${pageContext.request.contextPath}/bootstrap-3.3.7-dist/js/bootstrap.js"></script>
    <style>
        * {
            outline: none !important;
        }

        html,
        body {
            background: #1abe9c;
        }

        form {
            width: 300px;
            background: #ebeff2;
            box-shadow: 0px 0px 50px rgba(0, 0, 0, .5);
            border-radius: 5px;
            padding: 20px;
            position: absolute;
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%);
        }

        .btn-group {
            width: 100%;
        }

        .btn-group button {
            width: 50%;
        }
    </style>
</head>

<body>
<form action="doLogin.jsp" method="post">
    <h3 class="text-center" style="text-shadow: 2px 2px 1px #ed3f3f;">欢迎光临胡阿玛超市</h3>
    <div class="form-group">
        <input name="account" type="text" class="form-control" placeholder="请输入您的用户名">
    </div>
    <div class="form-group">
        <input name="password" type="password" class="form-control" placeholder="请输入您的密码">
    </div>
    <div class="btn-group">
        <button type="submit" class="btn btn-primary">登录</button>
        <button type="button" class="btn btn-danger">没有账号?</button>
    </div>
</form>
</body></html>

doLogin.jsp

<%@ page import="com.yilin.biz.IUserBiz"%>
<%@ page import="com.yilin.biz.impl.UserBizImpl"%>
<%@ page import="com.yilin.pojo.User"%>
<%@ page import="java.util.List"%>
<%@ page import="com.yilin.vo.CarItem"%>
<%@ page import="java.util.ArrayList"%>

<%@ page contentType="text/html;charset=UTF-8" language="java"%>
<%
request.setCharacterEncoding("utf-8");
String account = request.getParameter("account");
String password = request.getParameter("password");

IUserBiz userBiz = new UserBizImpl();
User user = userBiz.login(new User(0, account, password));
if (user == null) {
	response.sendRedirect("login.jsp");
} else {
	//首页需要登录数据
	session.setAttribute("user", user);
	//找来一个购物车
	List<CarItem> car = new ArrayList<>();
	//放到session中(把购物车session.setAttribute("car", car);
	response.sendRedirect("index.jsp");
}
%>

user.java(用户实体类)

package com.yilin.pojo;

/**
 * 用户实体类
 * @author 一麟
 *
 */
public class User {

    private Integer id;
    private String account;
    private String password;
    
    public User() {
		// TODO Auto-generated constructor stub
	}

	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getAccount() {
		return account;
	}

	public void setAccount(String account) {
		this.account = account;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}

	public User(Integer id, String account, String password) {
		super();
		this.id = id;
		this.account = account;
		this.password = password;
	}

	@Override
	public String toString() {
		return "User [id=" + id + ", account=" + account + ", password=" + password + "]";
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((account == null) ? 0 : account.hashCode());
		result = prime * result + ((id == null) ? 0 : id.hashCode());
		result = prime * result + ((password == null) ? 0 : password.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		User other = (User) obj;
		if (account == null) {
			if (other.account != null)
				return false;
		} else if (!account.equals(other.account))
			return false;
		if (id == null) {
			if (other.id != null)
				return false;
		} else if (!id.equals(other.id))
			return false;
		if (password == null) {
			if (other.password != null)
				return false;
		} else if (!password.equals(other.password))
			return false;
		return true;
	}
    
    

}

UserBizImpl.java(用户逻辑接口实现类)

package com.yilin.biz.impl;

import com.yilin.biz.IUserBiz;
import com.yilin.dao.IUserDao;
import com.yilin.dao.impl.UserDaoImpl;
import com.yilin.pojo.User;

/**
 * 
 * @author 一麟
 *
 */
public class UserBizImpl implements IUserBiz {

    private IUserDao userDao=new UserDaoImpl();
    @Override
    public User login(User user) {
        User u = userDao.login(user);
        if(u!=null){
            if (u.getPassword().equals(user.getPassword())) {
                return u;
            }
        }
        return null;
    }

}

IUserDao.java(用户数据访问接口)

package com.yilin.dao;

import com.yilin.pojo.User;

/**
 * 
 * @author 一麟
 *
 */
public interface IUserDao {

    User login(User user);

}

UserDaoImpl.java(用户数据访问接口实体类)

package com.yilin.dao.impl;

import com.yilin.dao.IUserDao;
import com.yilin.pojo.User;
import com.yilin.util.DBHelper;

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

/**
 * 
 * @author 一麟
 *
 */

public  class UserDaoImpl implements IUserDao {

    private Connection con;
    private PreparedStatement ps;
    private ResultSet rs;

    @Override
    public User login(User user) {
        try {
            con=DBHelper.getCon();
            ps=con.prepareStatement("select * from shop_user where account=?");
            ps.setString(1,user.getAccount());
            rs=ps.executeQuery();
            if(rs.next()){
                User u=new User();
                u.setId(rs.getInt(1));
                u.setAccount(rs.getString(2));
                u.setPassword(rs.getString(3));
                return u;
            }
        }catch (Exception e) {
            e.printStackTrace();
        }finally {
            DBHelper.close(con,ps,rs);
        }
        return null;
    }

}

 

增加购物车

goods.java(商品实体类)I

package com.yilin.pojo;

/**
 * 商品实体类
 * 
 * @author 一麟
 *
 */
public class Goods {

	private Integer id;
	private String name;
	private Integer price;
	private String info;

	public Goods() {
		// TODO Auto-generated constructor stub
	}

	@Override
	public String toString() {
		return "Goods [id=" + id + ", name=" + name + ", price=" + price + ", info=" + info + "]";
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((id == null) ? 0 : id.hashCode());
		result = prime * result + ((info == null) ? 0 : info.hashCode());
		result = prime * result + ((name == null) ? 0 : name.hashCode());
		result = prime * result + ((price == null) ? 0 : price.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		Goods other = (Goods) obj;
		if (id == null) {
			if (other.id != null)
				return false;
		} else if (!id.equals(other.id))
			return false;
		if (info == null) {
			if (other.info != null)
				return false;
		} else if (!info.equals(other.info))
			return false;
		if (name == null) {
			if (other.name != null)
				return false;
		} else if (!name.equals(other.name))
			return false;
		if (price == null) {
			if (other.price != null)
				return false;
		} else if (!price.equals(other.price))
			return false;
		return true;
	}

	public Goods(Integer id, String name, Integer price, String info) {
		super();
		this.id = id;
		this.name = name;
		this.price = price;
		this.info = info;
	}

	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Integer getPrice() {
		return price;
	}

	public void setPrice(Integer price) {
		this.price = price;
	}

	public String getInfo() {
		return info;
	}

	public void setInfo(String info) {
		this.info = info;
	}

}

 IGoodsBiz,java(商品逻辑接口)

package com.yilin.biz;

import com.yilin.pojo.Goods;

import java.util.List;

/**
 * 
 * @author 一麟
 *
 */
public interface IGoodsBiz {

    List<Goods> getAll();

    Goods getOne(Integer id);

}

GoodsBizImpl.java(商品逻辑接口实现类)

package com.yilin.biz.impl;

import com.yilin.biz.IGoodsBiz;
import com.yilin.dao.IGoodsDao;
import com.yilin.dao.impl.GoodsDaoImpl;
import com.yilin.pojo.Goods;

import java.util.List;


public class GoodsBizImpl implements IGoodsBiz {

    private IGoodsDao goodsDao=new GoodsDaoImpl();

    @Override
    public List<Goods> getAll() {
        return goodsDao.getAll();
    }

    @Override
    public Goods getOne(Integer id) {
        return goodsDao.getOne(id);
    }

}

IGoodsDao.java(商品数据访问接口)

package com.yilin.dao;

import com.yilin.pojo.Goods;

import java.util.List;

/**
 * 
 * @author 一麟
 *
 */
public interface IGoodsDao {

    //商品集合
    List<Goods> getAll();

    Goods getOne(Integer id);

}

GoodsDaoImpl.java(商品数据访问接口实现类)

package com.yilin.dao.impl;

import com.yilin.dao.IGoodsDao;
import com.yilin.pojo.Goods;
import com.yilin.util.DBHelper;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;

/**
 * 
 * @author 一麟
 *
 */
public class GoodsDaoImpl implements IGoodsDao {

    private Connection con;
    private PreparedStatement ps;
    private ResultSet rs;

    @Override
    public List<Goods> getAll() {
        List<Goods> list = new ArrayList<Goods>();
        try {
            con = DBHelper.getCon();
            ps = con.prepareStatement("select * from shop_goods");
            rs = ps.executeQuery();
            while (rs.next()) {
                Goods goods = new Goods();
                goods.setId(rs.getInt(1));
                goods.setName(rs.getString(2));
                goods.setPrice(rs.getInt(3));
                goods.setInfo(rs.getString(4));
                list.add(goods);
            }
            return list;
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            DBHelper.close(con, ps, rs);
        }
        return list;
    }

    @Override
    public Goods getOne(Integer id) {
        try {
            con = DBHelper.getCon();
            ps = con.prepareStatement("select * from shop_goods where id=?");
            ps.setInt(1, id);
            rs = ps.executeQuery();
            if (rs.next()) {
                Goods goods = new Goods();
                goods.setId(rs.getInt(1));
                goods.setName(rs.getString(2));
                goods.setPrice(rs.getInt(3));
                goods.setInfo(rs.getString(4));
                return goods;
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            DBHelper.close(con, ps, rs);
        }
        return null;
    }

}

doAdd.jsp(处理购物车的增加)

<%@page import="com.yilin.biz.impl.GoodsBizImpl"%>
<%@ page import="com.yilin.vo.CarItem" %>
<%@ page import="com.yilin.biz.IGoodsBiz" %>
<%@ page import="java.util.List" %>

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
    //拿购物车
    List<CarItem> car=(List<CarItem>)session.getAttribute("car");//将object类型转换为list<carItem>类型

    IGoodsBiz goodsBiz=new GoodsBizImpl();

    //添加购物车的页面

    //1.得知道是那件商品吧
    String str = request.getParameter("id");
    int id = -1;
    if (str != null) {
        id = Integer.parseInt(str);
    }

    //2-1.判断该商品是否存在
    boolean f=true;
    for (CarItem item : car) {
        // item.getGoods().getId() 条目的商品id
        if(id==item.getGoods().getId()){
            //商品应该是已经被添加购物车了 [购物车中某个条目的商品id和你需要添加的商品id相同了]
            item.setCount(item.getCount()+1);//数量+1
            item.setSum(item.getCount()*item.getGoods().getPrice());
            f=false;
            break;
        }
    }
    //只要判断f是否发生了改变
    if(f){
        //2-2.生成一个CarItem [如果购物车没有该商品]
        CarItem carItem=new CarItem();
        //设置对应的商品数据
        carItem.setGoods(goodsBiz.getOne(id));
        //商品加车的数量
        carItem.setCount(1);
        //carItem.getCount() 商品加车的数量
        //carItem.getGoods().getPrice() 商品的单价
        //加车数量*商品单价
        carItem.setSum(carItem.getCount()*carItem.getGoods().getPrice());
        //将 购物条目[carItem] 绑定到 购物车[car] 中
        car.add(carItem);
    }

    //更新购物车
    session.setAttribute("car", car);
    //跳回首页
    response.sendRedirect("index.jsp");
%>

CarItem.java(商品项实体类)

package com.yilin.vo;

import com.yilin.pojo.Goods;

/**
 * 
 * @author 一麟
 *
 */
public class CarItem {

    private Integer count;//总价
    private Integer sum;//条目总价
    private Goods goods;//商品对象
    
    public CarItem() {
		// TODO Auto-generated constructor stub
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((count == null) ? 0 : count.hashCode());
		result = prime * result + ((goods == null) ? 0 : goods.hashCode());
		result = prime * result + ((sum == null) ? 0 : sum.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		CarItem other = (CarItem) obj;
		if (count == null) {
			if (other.count != null)
				return false;
		} else if (!count.equals(other.count))
			return false;
		if (goods == null) {
			if (other.goods != null)
				return false;
		} else if (!goods.equals(other.goods))
			return false;
		if (sum == null) {
			if (other.sum != null)
				return false;
		} else if (!sum.equals(other.sum))
			return false;
		return true;
	}

	public Integer getCount() {
		return count;
	}

	public void setCount(Integer count) {
		this.count = count;
	}

	public Integer getSum() {
		return sum;
	}

	public void setSum(Integer sum) {
		this.sum = sum;
	}

	public Goods getGoods() {
		return goods;
	}

	public void setGoods(Goods goods) {
		this.goods = goods;
	}

	@Override
	public String toString() {
		return "CarItem [count=" + count + ", sum=" + sum + ", goods=" + goods + "]";
	}

	public CarItem(Integer count, Integer sum, Goods goods) {
		super();
		this.count = count;
		this.sum = sum;
		this.goods = goods;
	}

}

index(主页)

<%@ page import="com.yilin.pojo.User"%>
<%@ page import="com.yilin.biz.IGoodsBiz"%>
<%@ page import="com.yilin.biz.impl.GoodsBizImpl"%>
<%@ page import="com.yilin.pojo.Goods"%>
<%@ page contentType="text/html;charset=UTF-8" language="java"%>

<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<title>Document</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet"
	href="${pageContext.request.contextPath}/bootstrap-3.3.7-dist/css/bootstrap.css">
<script
	src="${pageContext.request.contextPath}/bootstrap-3.3.7-dist/js/jquery-3.5.1.js"></script>
<script
	src="${pageContext.request.contextPath}/bootstrap-3.3.7-dist/js/bootstrap.js"></script>
<style>
td:nth-child(3)::before {
	content: "
<%@ page import="com.yilin.pojo.User"%>
<%@ page import="com.yilin.biz.IGoodsBiz"%>
<%@ page import="com.yilin.biz.impl.GoodsBizImpl"%>
<%@ page import="com.yilin.pojo.Goods"%>
<%@ page contentType="text/html;charset=UTF-8" language="java"%>

<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<title>Document</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet"
	href="${pageContext.request.contextPath}/bootstrap-3.3.7-dist/css/bootstrap.css">
<script
	src="${pageContext.request.contextPath}/bootstrap-3.3.7-dist/js/jquery-3.5.1.js"></script>
<script
	src="${pageContext.request.contextPath}/bootstrap-3.3.7-dist/js/bootstrap.js"></script>
<style>
td:nth-child(3)::before {
	content: "$";
}
</style>
</head>

<body>
	<%
	Object obj = session.getAttribute("user");
	if (obj == null) {
		response.sendRedirect("login.jsp");
		return;
	}
	%>
	<div class="jumbotron">
		<div class="container">
			<h1>欢迎光临胡阿玛SuperMarket</h1>
			<p>
				尊贵的<%=((User) obj).getAccount()%></p>
		</div>
	</div>
	<%=session.getAttribute("car")%>
	<div class="container">
		<table class="table">
			<tr>
				<th>商品序号</th>
				<th>商品名称</th>
				<th>商品单价</th>
				<th>商品描述</th>
				<th>操作</th>
			</tr>
			<%
			IGoodsBiz goodsBiz = new GoodsBizImpl();
			for (Goods goods : goodsBiz.getAll()) {
			%>
			<tr>
				<td><%=goods.getId()%></td>
				<td><%=goods.getName()%></td>
				<td><%=goods.getPrice()%></td>
				<td><%=goods.getInfo()%></td>
				<td>
					<div class="btn-group btn-group-xs">
						<a href="doAddCar.jsp?id=<%=goods.getId()%>"
							class="btn btn-primary">添加购物车</a>
					</div>
				</td>
			</tr>
			<%
			}
			%>
		</table>
	</div>
</body>
</html>
quot;;
}
</style>
</head>

<body>
	<%
	Object obj = session.getAttribute("user");
	if (obj == null) {
		response.sendRedirect("login.jsp");
		return;
	}
	%>
	<div class="jumbotron">
		<div class="container">
			<h1>欢迎光临胡阿玛SuperMarket</h1>
			<p>
				尊贵的<%=((User) obj).getAccount()%></p>
		</div>
	</div>
	<%=session.getAttribute("car")%>
	<div class="container">
		<table class="table">
			<tr>
				<th>商品序号</th>
				<th>商品名称</th>
				<th>商品单价</th>
				<th>商品描述</th>
				<th>操作</th>
			</tr>
			<%
			IGoodsBiz goodsBiz = new GoodsBizImpl();
			for (Goods goods : goodsBiz.getAll()) {
			%>
			<tr>
				<td><%=goods.getId()%></td>
				<td><%=goods.getName()%></td>
				<td><%=goods.getPrice()%></td>
				<td><%=goods.getInfo()%></td>
				<td>
					<div class="btn-group btn-group-xs">
						<a href="doAddCar.jsp?id=<%=goods.getId()%>"
							class="btn btn-primary">添加购物车</a>
					</div>
				</td>
			</tr>
			<%
			}
			%>
		</table>
	</div>
</body>
</html>

 

数据库建表：

--用户表
CREATE TABLE SHOP_USER(
ID NUMBER PRIMARY KEY,
ACCOUNT VARCHAR2(30) NOT NULL,
PASSWORD VARCHAR2(30) NOT NULL
)
insert into shop_user values(1,'yilin','jiang');
commit;


--商品表
CREATE TABLE SHOP_GOODS(
ID NUMBER PRIMARY KEY,
NAME VARCHAR2(30) NOT NULL,
PRICE NUMBER DEFAULT 0,
INFO VARCHAR2(30) DEFAULT '暂无描述'
)

文件目录：

 这期的分享就到此为止了，下期继续完善购物车小项目！😄😄😄😄

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