JavaWeb實戰之開發網上購物系統(超詳細)
一、項目描述
基於B/S三層架構設計的購物系統，可以更好地符合”高內聚，低耦合”的設計思想。表現層（UI）通過JSP在瀏覽器上實現界面展示，通過Servlet接受用戶請求並生成驗證碼等實時信息；數據訪問層（DAL）通過JDBC對DBMS進行訪問；二者之間的業務邏輯層（BLL）通過Service進行連接。同時面向接口編程提高規范化。這隻是我自己用兩三天的時間做的小項目，距離真正的購物系統差距還是很大的，僅供初學者參考，很多邏輯缺陷不必太糾結，以後有時間會再寫一篇博客對這個項目進行相關測試。
如果隻需要代碼可直接通過書簽欄跳轉至相關文件。
二、項目演示
這是購物系統首頁，是仿照華為商城設計的，當然也可以說是仿照小米商城，這二者的頁面設計並無本質區別，具體實現借助於Bootstrap，商品信息通過後臺數據庫讀取，商品表見下
點擊任意商品進入詳情界面
如果此時點擊加入購物車會調用Servlet中的doPost方法，進而通過登陸信息是否讀取成功判斷登陸狀態，如果未登錄則轉至登錄界面並提示相關信息，背景漸變色借助於webgradients選取，同時實現正則驗證與驗證碼相關功能
我們先註冊再登錄，這裡註冊洛的相關信息
註冊成功
之後我們登錄並將心儀的商品加入購物車，查看購物車，這裡會一致顯示當前登錄用戶信息
提交訂單後查看訂單，這裡借助jQuery做瞭一個下拉框，可以查看後臺數據庫關於此訂單的全部信息，這裡提交訂單相當於付款，所以未設退貨功能，因此數據刪除隻能借助於後臺數據庫。
最後點擊註銷返回主頁
三、部分代碼
JdbcUtils.java
用於加載驅動並獲得與數據庫的連接的工具類
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() {
//加載驅動
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";
//獲得連接
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
與數據庫中用戶表相匹配的用戶類
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
對用戶信息進行相關操作的接口
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
對上述接口的實現
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語句:" + 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語句:" + 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
在業務邏輯層中將表現層與數據訪問層進行連接，由於項目本身並不復雜，所以隻是簡單實現瞭方法傳遞
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
對上述接口的實現
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
在內存中生成驗證碼圖片並輸出到客戶端
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是客戶端瀏覽器發出的請求被封裝形成的一個HttpServletRequest公共接口類對象
* session對象存儲特定用戶會話所需的屬性及配置信息, 這樣當用戶在應用程序的Web頁之間跳轉時, 存儲在session對象中的變量將不會丟失, 而是在整個用戶會話中一直存在下去
* getSession()與getSession(true)一樣, 獲取request對象關聯的session對象, 如果沒有session, 則返回一個新的session
*/
HttpSession session=request.getSession();
response.setContentType("image/jpeg");// 設置生成的文檔類型為jpg
ServletOutputStream servletOutputStream = response.getOutputStream();
/*設置瀏覽器不要緩存此圖片*/
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
/**
* 創建內存圖片並獲得其圖形上下文
* Image是一個抽象類, BufferedImage是其實現類, 是一個帶緩沖區圖像類, 主要作用是將一幅圖片加載到內存中
* BufferedImage生成的圖片在內存裡有一個圖像緩沖區, 利用這個緩沖區我們可以很方便地操作這個圖片
*/
BufferedImage image=new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics graphics=image.getGraphics();
char[] rands=generCode();// 產生隨機的驗證碼
drawRands(graphics, rands);// 產生圖像
graphics.dispose();// 結束圖像的繪制過程，完成圖像
/*將圖像輸出到客戶端*/
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));// 將當前的驗證碼寫入到session中
}
private char[] generCode() {
//定義驗證碼的字符表
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));
/*在不同高度上輸出驗證碼的每個字符*/
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("當前驗證碼:");
System.out.println(rands);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
到此這篇關於Java實戰之利用JavaWeb開發購物系統(超詳細)的文章就介紹到這瞭,更多相關JavaWeb購物系統內容請搜索WalkonNet以前的文章或繼續瀏覽下面的相關文章希望大傢以後多多支持WalkonNet！
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