JavaWeb网上购物系统 JavaWeb实战之开发网上购物系统(超详细)

呦，又写BUG呢 2021-04-22 我要评论

想了解JavaWeb实战之开发网上购物系统(超详细)的相关内容吗，呦，又写BUG呢在本文为您仔细讲解JavaWeb网上购物系统的相关知识和一些Code实例，欢迎阅读和指正，我们先划重点：JavaWeb网上购物系统,JavaWeb购物系统，下面大家一起来学习吧。

一、项目描述

基于B/S三层架构设计的购物系统，可以更好地符合"高内聚，低耦合"的设计思想。表现层（UI）通过JSP在浏览器上实现界面展示，通过Servlet接受用户请求并生成验证码等实时信息；数据访问层（DAL）通过JDBC对DBMS进行访问；二者之间的业务逻辑层（BLL）通过Service进行连接。同时面向接口编程提高规范化。这只是我自己用两三天的时间做的小项目，距离真正的购物系统差距还是很大的，仅供初学者参考，很多逻辑缺陷不必太纠结，以后有时间会再写一篇博客对这个项目进行相关测试。

如果只需要代码可直接通过书签栏跳转至相关文件。

二、项目演示

这是购物系统首页，是仿照华为商城设计的，当然也可以说是仿照小米商城，这二者的页面设计并无本质区别，具体实现借助于Bootstrap，商品信息通过后台数据库读取，商品表见下

在这里插入图片描述

点击任意商品进入详情界面

在这里插入图片描述

如果此时点击加入购物车会调用Servlet中的doPost方法，进而通过登陆信息是否读取成功判断登陆状态，如果未登录则转至登录界面并提示相关信息，背景渐变色借助于webgradients选取，同时实现正则验证与验证码相关功能

在这里插入图片描述

我们先注册再登录，这里注册洛的相关信息

在这里插入图片描述

注册成功

在这里插入图片描述

之后我们登录并将心仪的商品加入购物车，查看购物车，这里会一致显示当前登录用户信息

在这里插入图片描述

提交订单后查看订单，这里借助jQuery做了一个下拉框，可以查看后台数据库关于此订单的全部信息，这里提交订单相当于付款，所以未设退货功能，因此数据删除只能借助于后台数据库。

在这里插入图片描述

最后点击注销返回主页

在这里插入图片描述

三、部分代码

JdbcUtils.java

用于加载驱动并获得与数据库的连接的工具类

package common;

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

public class JdbcUtil {
	static Connection connection;
	public static Connection getCon() {
		//加载驱动
		try {
			Class.forName("com.mysql.jdbc.Driver");
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		String url = "jdbc:mysql://localhost:3306/shoppingsystem?characterEncoding=utf-8";
		String username = "root";
		String password = "123";
		
		//获得连接
		try {
			connection = DriverManager.getConnection(url, username, password);
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		return connection;
	}
	public static void closeAll(Connection connection, PreparedStatement preparedStatement, ResultSet resultSet) {
		if (resultSet != null) {
			try {
				resultSet.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		if (preparedStatement != null) {
			try {
				preparedStatement.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		if (connection != null) {
			try {
				connection.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
}
、

People.java

与数据库中用户表相匹配的用户类

package entity;

public class People {
	private String id;
	private String password;
	private String name;
	private String email;
	private String address;
	
	public People() {
		super();
		// TODO Auto-generated constructor stub
	}
	
	public People(String id, String password, String name, String email, String address) {
		super();
		this.id = id;
		this.password = password;
		this.name = name;
		this.email = email;
		this.address = address;
	}

	public String getId() {
		return id;
	}

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

	public String getPassword() {
		return password;
	}

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

	public String getName() {
		return name;
	}

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

	public String getEmail() {
		return email;
	}

	public void setEmail(String email) {
		this.email = email;
	}

	public String getAddress() {
		return address;
	}

	public void setAddress(String address) {
		this.address = address;
	}

	@Override
	public String toString() {
		return "People [id=" + id + ", password=" + password + ", name=" + name + ", email=" + email + ", address="
				+ address + "]";
	}
	
}

InterfacePeopleDao.java

对用户信息进行相关操作的接口

package dao;

import java.util.List;

import entity.People;

public interface InterfacePeopleDao {
	public abstract int insertPeople(String id, String password, String name, String email, String address);
	
	public abstract int deletePeople(String id);
	
	public abstract int updatePeople(String id, String password, String name, String email, String address);
	
	public abstract People checkPeople(String id, String password);
	
	public abstract List<People> findAllPeople();
}

PeopleDao.java

对上述接口的实现

package dao;

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

import common.JdbcUtil;
import entity.People;

public class PeopleDao implements InterfacePeopleDao {
	private Connection connection;
	private PreparedStatement preparedStatement;
	private ResultSet resultSet;

	@Override
	public int insertPeople(String id, String password, String name, String email, String address) {
		String sql = "mistake";
		if (id != "" && password != "" && name != "" && email != "" && address != "") {
			sql = "insert into people (id, password, name, email, address)" + "values('" + id + "','" + 
					password + "','" + name + "','" + email + "','" + address + "');";
		}
		System.out.println("insertPeople()的sql语句:" + sql);
		
		int result = 0;
		connection = JdbcUtil.getCon();
		try {
			preparedStatement = connection.prepareStatement(sql);
		} catch (SQLException e) {
			e.printStackTrace();
		}
		try {
			result = preparedStatement.executeUpdate();
		} catch (SQLException e) {
			e.printStackTrace();
		}
		JdbcUtil.closeAll(connection, preparedStatement, resultSet);
		return result;
	}

	@Override
	public int deletePeople(String id) {
		// TODO Auto-generated method stub
		return 0;
	}

	@Override
	public int updatePeople(String id, String password, String name, String email, String address) {
		// TODO Auto-generated method stub
		return 0;
	}

	@Override
	public People checkPeople(String id, String password) {
		String sql = null;
		if (id != null && password != null) {
			sql = "select * from people where id = '" + id + "' and password = '" + password + "'";
		}
		System.out.println("checkPeople()的sql语句:" + sql);
		
		People people = null;
		connection = JdbcUtil.getCon();
		try {
			preparedStatement = connection.prepareStatement(sql);
			resultSet = preparedStatement.executeQuery();
			if (resultSet.next()) {
				people = new People();
				people.setId(resultSet.getString(1));
				people.setPassword(resultSet.getString(2));
				people.setName(resultSet.getString(3));
				people.setEmail(resultSet.getString(4));
				people.setAddress(resultSet.getString(5));
			}
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			JdbcUtil.closeAll(connection, preparedStatement, resultSet);
		}
		return people;
	}

	@Override
	public List<People> findAllPeople() {
		// TODO Auto-generated method stub
		return null;
	}

}

InterfacPeopleService.java

在业务逻辑层中将表现层与数据访问层进行连接，由于项目本身并不复杂，所以只是简单实现了方法传递

package service;

import java.util.List;

import entity.People;

public interface InterfacePeopleService {
	public abstract int insertPeople(String id, String password, String name, String email, String address);
	
	public abstract int deletePeople(String id);
	
	public abstract int updatePeople(String id, String password, String name, String email, String address);
	
	public abstract People checkPeople(String id, String password);
	
	public abstract List<People> findAllPeople();
}

PeopleService.java

对上述接口的实现

package service;

import java.util.List;

import dao.InterfacePeopleDao;
import dao.PeopleDao;
import entity.People;

public class PeopleService implements InterfacePeopleService {
	private InterfacePeopleDao peopleDao;
	
	public PeopleService() {
		peopleDao = new PeopleDao();
	}

	@Override
	public int insertPeople(String id, String password, String name, String email, String address) {
		return peopleDao.insertPeople(id, password, name, email, address);
	}

	@Override
	public int deletePeople(String id) {
		// TODO Auto-generated method stub
		return 0;
	}

	@Override
	public int updatePeople(String id, String password, String name, String email, String address) {
		// TODO Auto-generated method stub
		return 0;
	}

	@Override
	public People checkPeople(String id, String password) {
		return peopleDao.checkPeople(id, password);
	}

	@Override
	public List<People> findAllPeople() {
		// TODO Auto-generated method stub
		return null;
	}

}

CheckCode.java

在内存中生成验证码图片并输出到客户端

package servlet;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@WebServlet("/CheckCode")
public class CheckCode extends HttpServlet {
	private static final long serialVersionUID = 1L;
	private static int width=70;
    private static int height=25;
       
	public CheckCode() {
		super();
		// TODO Auto-generated constructor stub
	}

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		/**
		 * request是客户端浏览器发出的请求被封装形成的一个HttpServletRequest公共接口类对象
		 * session对象存储特定用户会话所需的属性及配置信息, 这样当用户在应用程序的Web页之间跳转时, 存储在session对象中的变量将不会丢失, 而是在整个用户会话中一直存在下去
		 * getSession()与getSession(true)一样, 获取request对象关联的session对象, 如果没有session, 则返回一个新的session
		 */
		HttpSession session=request.getSession();
		response.setContentType("image/jpeg");// 设置生成的文档类型为jpg
		ServletOutputStream servletOutputStream = response.getOutputStream();
		
		/*设置浏览器不要缓存此图片*/
		response.setHeader("Pragma", "No-cache");
		response.setHeader("Cache-Control", "no-cache");
		response.setDateHeader("Expires", 0);
		
		/**
		 * 创建内存图片并获得其图形上下文
		 * Image是一个抽象类, BufferedImage是其实现类, 是一个带缓冲区图像类, 主要作用是将一幅图片加载到内存中
		 * BufferedImage生成的图片在内存里有一个图像缓冲区, 利用这个缓冲区我们可以很方便地操作这个图片
		 */
		BufferedImage image=new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		Graphics graphics=image.getGraphics();
		
		char[] rands=generCode();// 产生随机的验证码
		drawRands(graphics, rands);// 产生图像
		graphics.dispose();// 结束图像的绘制过程，完成图像
		
		/*将图像输出到客户端*/
		ByteArrayOutputStream byteArrayOutputStream=new ByteArrayOutputStream();
		ImageIO.write(image, "jpeg", byteArrayOutputStream);
		byte[] buf=byteArrayOutputStream.toByteArray();
		response.setContentLength(buf.length);
		servletOutputStream.write(buf);
		byteArrayOutputStream.close();
		servletOutputStream.close();
		
		session.setAttribute("checkcode", new String(rands));// 将当前的验证码写入到session中	
		
	}
	
	private char[] generCode() {
    	//定义验证码的字符表
    	String chars="0123456789";
    	char[] rands=new char[5];
    	for(int i=0;i<5;i++) {
    		int rand=(int)(Math.random()*10);
    		rands[i]=chars.charAt(rand);
    	}
    	return rands;
    }
	
	private void drawRands(Graphics g,char[] rands) {
		g.setColor(Color.WHITE);
		g.setFont(new Font(null, Font.ITALIC|Font.BOLD, 18));
		
		/*在不同高度上输出验证码的每个字符*/
		g.drawString("" + rands[0], 0, 18);
		g.drawString("" + rands[1], 14, 18);
		g.drawString("" + rands[2], 28, 18);
		g.drawString("" + rands[3], 42, 18);
		g.drawString("" + rands[4], 56, 18);
		System.out.print("当前验证码:");
		System.out.println(rands);
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doGet(request, response);
	}

}

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JavaWeb网上购物系统 JavaWeb实战之开发网上购物系统(超详细)

一、项目描述

二、项目演示

三、部分代码

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