java最终考核项目（实现商品管理系统）

文章目录

首先声明一点，java这门语言其实博主是个小白，有很多小细节没考虑进去，大家有需要的私下各自完善一下，还请各位大佬多多谅解，谢谢，祝大家取得好成绩，冲冲冲，加油！！！
第一步：
第二步：
第三步：
第四步：
第五步：
第六步：
第七步：
第八步：
第九步：

首先声明一点，java这门语言其实博主是个小白，有很多小细节没考虑进去，大家有需要的私下各自完善一下，还请各位大佬多多谅解，谢谢，祝大家取得好成绩，冲冲冲，加油！！！

题目：
1)选择登陆要求输入用户名密码和验证码，输入错误要求给出相应的提示信息

2)选择注册要求输入用户名，密码，确认密码，验证码（4位）
如果两次密码不一致，或者验证码不正确都将导致注册失败，给出提示信息
如果用户名已被使用，则该用户注册失败，也应给与相应的提示信息

3)登录成功进入主菜单，呈现如下：
1.热门商品
2.商品查询
3.后台管理

4）选择热门商品将呈现销量最高的10件商品的序号（从1开始显示的序列）、商品名称、销量

用户选择序号后可以查看该商品的详细信息（商品名称、品牌、价格、类型）
5）选择商品查询可以显示以下菜单：
1.品牌查询
2.价格查询

6）选择品牌查询，可以输入品牌名称，显示该品牌的所有商品（序号、名称、品牌），选择序号可以查看详细信息，参考4）

7）选择价格查询，可以输入价格区间，显示该价格范围内的所有商品（序号、名称、价格），选择序号可以查看详细信息，参考4）

8）选择后台管理，显示以下菜单：
1.新增商品
2.修改价格
3.删除商品

9）选择新增商品，需要输入商品名称、价格、品牌、类型，该商品将保存至系统
10）选择修改价格，呈现所有商品的品牌（序号、品牌名称），选择序号后呈现该品牌下所有商品信息（序号、商品名称、价格），输入新的价格，提示用户是否需要保存该价格
11）选择删除商品，呈现所有商品的品牌（序号、品牌名称），选择序号后呈现该品牌下所有商品信息（序号、商品名称），选择序号后提示是否删除，确认后删除
12）所有菜单以及选项可以按0返回上一层

第一步：

package com.igeek.dao;
import com.igeek.data.Database;
import com.igeek.pojo.Brand;
import com.igeek.pojo.Goods;import java.util.ArrayList;
import java.util.List;package com.igeek.dao;
import com.igeek.data.Database;
import com.igeek.pojo.Brand;
import com.igeek.pojo.Goods;import java.util.ArrayList;
import java.util.List;public class BrandDao {Database dataBaseOne;List<Goods>goodsListTwo;public BrandDao(Database dataBaseOne) {this.dataBaseOne = dataBaseOne;}/*** 根据品牌名称查询* @param brandName* @return*/public List<Goods> findByName(int brandName){Goods goods=null;goodsListTwo=new ArrayList<>();List<Goods>goodsListOne=dataBaseOne.getGoods();for(int i=0;i<goodsListOne.size();i++){goods=goodsListOne.get(i);if(goods.getBrandNumber()==brandName){goodsListTwo.add(goods);}}return goodsListTwo;}public Brand findByID(int number){Brand brand=null;List <Brand> list1=dataBaseOne.getBrand();for(int i=0;i<list1.size();i++){if(list1.get(i).getBrandNumber()==number){brand=list1.get(i);break;}}return brand;}/*** 查询所有品牌* @return*/public List<Brand> findAll(){List<Brand>brandListOne=new ArrayList<>();List<Goods>goodsListOne=dataBaseOne.getGoods();for(int i=0;i<goodsListOne.size();i++){if(reapeat(brandListOne,goodsListOne.get(i))==true){Goods goods=goodsListOne.get(i);String name = idChangeName(goods.getBrandNumber());Brand brand=new Brand(i+1,name);brandListOne.add(brand);}}return brandListOne;}public boolean  reapeat(List<Brand>list,Goods goods){boolean a=true;for(int i=0;i<list.size();i++){if(list.get(i).getBrandNumber()==goods.getBrandNumber()){a=false;}}return a;}public int nameChangeID(String name){int n=0;for(int i=0;i<dataBaseOne.getBrand().size();i++){if(name.equals(dataBaseOne.getBrand().get(i).getName())){n=i+1;}}return n;}public String idChangeName(int  ID){String name=null;for(int i=0;i<dataBaseOne.getBrand().size();i++){if(ID==dataBaseOne.getBrand().get(i).getBrandNumber()){name=dataBaseOne.getBrand().get(i).getName();}}return name;}}

第二步：

package com.igeek.dao;
import com.igeek.data.Database;
import com.igeek.pojo.Goods;
import java.util.ArrayList;
import java.util.List;public class GoodsDao {Database dataBaseOne;List<Goods> goods=new ArrayList<>();List<Goods> goodsList = new ArrayList<>();public GoodsDao(Database database1) {this.dataBaseOne = database1;}/*** 查找销量前10的商品** @return*/public  List<Goods> findHotGoods() {List<Goods> goods2 = dataBaseOne.getGoods();for(int i=0;i<goods2.size()-1;i++){for(int j=0;j<goods2.size()-1-i;j++){Goods goods=new Goods();if(goods2.get(j).getConsume()<goods2.get(j+1).getConsume()){goods=goods2.get(j);goods2.set(j, goods2.get(j+1));goods2.set(j+1, goods);}}}return goods2;}/*** 根据品牌编号查询商品** @param brandId* @return*/public List<Goods> findByBrandId(int brandId) {Goods goods3 = null;List<Goods> goodsList1 = dataBaseOne.getGoods();for (int i = 0; i < goodsList1.size(); i++) {goods3 = goodsList1.get(i);if (brandId == goods3.getBrandNumber()) {goods.add(goods3);}}return goods;}/*** 根据价格范围查询商品** @param minPrice* @param maxPrice* @return*/public List<Goods> findByPrice(int minPrice, int maxPrice) {Goods goods1 = null;List<Goods> goodsList1 = dataBaseOne.getGoods();for (int i = 0; i < goodsList1.size(); i++){goods1 = goodsList1.get(i);if (goods1.getPrice() > minPrice && goods1.getPrice() < maxPrice) {goodsList.add(goods1);}}return goodsList;}/*** 新增商品** @param goods*/public void insert(Goods goods) {dataBaseOne.getGoods().add(goods);}/*** 修改价格** @param goodsId* @param price*/public void modify(int goodsId, double price) {List<Goods> goodsList1 = dataBaseOne.getGoods();for (int i = 0; i < dataBaseOne.getGoods().size(); i++) {Goods goods1 = goodsList1.get(i);if (goods1.getGoodID() == goodsId) {goods1.setPrice(price);}}}/*** 删除商品** @param goodsId*/public void delete(int goodsId) {List<Goods> goodsList = dataBaseOne.getGoods();for (int i = 0; i < dataBaseOne.getGoods().size(); i++) {Goods goods = goodsList.get(i);if(goods.getGoodID() == goodsId){goodsList.remove(goods.getBrandNumber()-1);}}}public void addDatabase(String name,int price,int brandNumber,String type){Goods goods=new Goods(name,price,brandNumber,type);goods.setGoodID(dataBaseOne.getGoods().size()+1);goods.setBrandNumber(1);dataBaseOne.getGoods().add(goods);}public List<Goods>  findAllGoods(){List<Goods> list=dataBaseOne.getGoods();return list;}public Goods findByFoodID(int number){Goods goodsOne=null;for (int i = 0; i < dataBaseOne.getGoods().size(); i++) {if(number==dataBaseOne.getGoods().get(i).getGoodID()){goodsOne=dataBaseOne.getGoods().get(i);break;}}return goodsOne;}}

第三步：

package com.igeek.dao;import com.igeek.data.Database;
import com.igeek.pojo.User;public class UserDao {Database dataBaseOne;public UserDao(Database databaseOne) {this.dataBaseOne = databaseOne;}/*** 根据用户名查找用户* @param userName* @return*/public User findByName(String userName){User user =null;for (User users:dataBaseOne.getUser()) {if((users.getUser()).equals(userName)){ user=users;break;}}return user;}/*** 新增用户* @param user*/public void inSert(User user){dataBaseOne.getUser().add(user);}
}

第四步：

package com.igeek.pojo;/*** 品牌*/
public class Brand {//品牌编号private int brandnumber;//品牌名称private String name;public Brand(int brandnumber, String name) {this.brandnumber = brandnumber;this.name = name;}public int getBrandnumber() {return brandnumber;}public void setBrandnumber(int brandnumber) {this.brandnumber = brandnumber;}public String getName() {return name;}public void setName(String name) {this.name = name;}
}

第五步：

package com.igeek.pojo;/*** 商品类*/
package com.igeek.pojo;/*** 商品类*/
public class Goods {public Goods(int goodsNumber) {this.goodsID = goodsNumber;}//商品编号private int goodsID;//名称private String name;//价格private  double price;//销量private int consume;public Goods() {}//品牌编号private int brandNumber;//类型private String type;public Goods(String name, double price, int brandNumber, String type) {goodsID=goodsID+1;this.name = name;this.price = price;this.brandNumber = brandNumber;this.type = type;}public Goods(int goodsNumber, String name, int price, int consume, int brandNumber, String type) {this.goodsID = goodsNumber;this.name = name;this.price = price;this.consume = consume;this.brandNumber = brandNumber;this.type = type;}public int getGoodID() {return goodsID;}public void setGoodID(int goodsNumber) {this.goodsID = goodsNumber;}public String getName() {return name;}public void setName(String name) {this.name = name;}public double getPrice() {return price;}public void setPrice(double price) {this.price = price;}public int getConsume() {return consume;}public void setConsume(int consume) {this.consume = consume;}public int getBrandNumber() {return brandNumber;}public void setBrandNumber(int brandNumber) {this.brandNumber = brandNumber;}public String getType() {return type;}public void setType(String type) {this.type = type;}
}

第六步：

package com.igeek.pojo;/*** 用户类*/
public class User {//用户名String user;//密码String password;public void setUserID(int userID) {this.userID = userID;}//IDint userID;public User(String user, String password, int userID) {this.user = user;this.password = password;this.userID = userID;}public User(String user, String password) {this.user = user;this.password = password;}public String getUser() {return user;}public void setUser(String user) {this.user = user;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}
}

第七步：

package com.igeek.data;import com.igeek.pojo.Brand;
import com.igeek.pojo.Goods;
import com.igeek.pojo.User;import java.util.ArrayList;
import java.util.List;public class Database {//存储所有的用户信息List<User> user=new ArrayList<>();//存储所有的商品信息List<Goods> goods=new ArrayList<>();//存储所有的品牌信息List<Brand> brand=new ArrayList<>();public List<User> getUser() {return user;}public void setUser(List<User> user) {this.user = user;}public List<Goods> getGoods() {return goods;}public void setGoods(List<Goods> goods) {this.goods = goods;}public List<Brand> getBrand() {return brand;}public void setBrand(List<Brand> brand) {this.brand = brand;}public Database() {User a=new User("艾某","123",01);User b=new User("丘比特","456",02);Goods good1=new Goods(1,"苹果",20,30,1,"水果");Goods good2=new Goods(2,"火龙果",30,40,1,"水果");Goods good3=new Goods(3,"香蕉",30,50,1,"水果");Goods good4=new Goods(4,"梨",30,60,1,"水果");Goods good5=new Goods(5,"玩具车",700,70,2,"玩具");Goods good6=new Goods(6,"玩具小飞机",550,55,2,"玩具");Goods good7=new Goods(7,"坦克",500,90,2,"玩具");Goods good8=new Goods(8,"华硕笔记本",5001,50,3,"电子产品");Goods good9=new Goods(9,"惠普笔记本",5000,49,3,"电子产品");Goods good10=new Goods(10,"华为 p30",3000,30,3,"电子产品");Goods good11=new Goods(11,"华为 p40",4000,35,3,"电子产品");Brand brand1=new Brand(1,"水果系列");Brand brand2=new Brand(2,"玩具系列");Brand brand3=new Brand(3,"电子产品系列");//初始化用户信息user.add(a);user.add(b);//初始化品牌信息goods.add(good1);goods.add(good2);goods.add(good3);goods.add(good4);goods.add(good5);goods.add(good6);goods.add(good7);goods.add(good8);goods.add(good9);goods.add(good10);goods.add(good11);//初始化商品信息brand.add(brand1);brand.add(brand2);brand.add(brand3);}
}

第八步：

package com.igeek.service;import com.igeek.dao.BrandDao;
import com.igeek.dao.GoodsDao;
import com.igeek.dao.UserDao;
import com.igeek.data.Database;
import com.igeek.pojo.Brand;
import com.igeek.pojo.Goods;
import com.igeek.pojo.User;import java.awt.*;
import java.util.*;
import java.util.List;/*** 商品管理系统*/
public class GoodsService {private BrandDao brandDao;private UserDao userDao;private GoodsDao goodsDao;public GoodsService(Database dataBaseOne) {this.brandDao = new BrandDao(dataBaseOne);this.userDao = new UserDao(dataBaseOne);this.goodsDao = new GoodsDao(dataBaseOne);start();}private int userID = 100;Scanner scanners = new Scanner(System.in);/*** 构造方法** @param database*//*** 起始菜单*/public void start() {System.out.println("1. 登录");System.out.println("2. 注册");System.out.println("3. 退出系统");int choices = scanners.nextInt();switch (choices) {case 1:login();mainMenu();break;case 2:regist();start();break;default:System.exit(0);}}/*** 登陆*/public void login(){System.out.println("请输入用户名：");String userName = scanners.next();System.out.println("请输入密码：");String password = scanners.next();Random random=new Random();           //创建随机数生成器String str="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";StringBuilder sb=new StringBuilder(4);for(int i=0;i<4;i++){char ch=str.charAt(new Random().nextInt(str.length()));sb.append(ch);}System.out.println(sb.toString());System.out.println("请输入验证码：");String verification=scanners.next();//通过DAO根据用户名查询数据库中对象User user = userDao.findByName(userName);//判断用户是否存在if(user != null){//将数据库中找到的账户，再根据其密码和输入的密码比较if(user.getPassword().equals(password)&&verification.equals(sb.toString())){System.out.println("登录成功！");mainMenu();}else if(!(user.getPassword().equals(password))){System.out.println("密码错误！");login();}else if(!(verification.equals(sb.toString()))){System.out.println("验证码错误！");login();}}else{System.out.println("用户名不存在！请重新输入");login();}}/*** 注册*/public void regist() {System.out.println("请输入注册的用户名：");String userName = scanners.next();System.out.println("请输入注册的密码：");String password = scanners.next();System.out.println("请再次输入密码：");String passWord = scanners.next();if (passWord.equals(password)) {Random random = new Random();           //创建随机数生成器String str = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";StringBuilder sb = new StringBuilder(4);for (int i = 0; i < 4; i++) {char ch = str.charAt(random.nextInt(str.length()));sb.append(ch);}System.out.println(sb.toString());System.out.println("请输入验证码：");String verification = scanners.next();//判断用户名是否被注册User user = userDao.findByName(userName);if (user != null) {System.out.println("该用户名已被注册！输入0返回上一层菜单，其他任意键继续注册");String result = scanners.next();if (result.equals("0")) {start();} else {regist();}} else {System.out.println("您已注册成功！");//根据注册的信息创建一个账户对象User registUser = new User(userName, password);registUser.setUser(userName);registUser.setPassword(password);//将注册的信息写入数据库userDao.inSert(registUser);//返回起始菜单start();}}else{System.out.println("两次密码不一样，请重新注册");regist();}}/*** 主菜单*/public void mainMenu() {//显示热门商品、商品查询、商品管理System.out.println("1.热门商品");System.out.println("2.商品查询");System.out.println("3.后台管理");String input = scanners.next();do {if (input.equals("0"))start();switch (input) {case "1":hotGoods();System.out.println("待输入");if (scanners.nextInt() == 0)mainMenu();break;case "2":search();System.out.println("待输入");if (scanners.nextInt() == 0)mainMenu();break;case "3":goodsManage();System.out.println("待输入");if (scanners.nextInt() == 0)mainMenu();break;default:if (scanners.nextInt() == 0)start();else {System.out.println("输入有误");mainMenu();}}} while(!input.equals("0")&&!input.equals("3"));}/*** 热门商品*/public void hotGoods() {List<Goods> list = goodsDao.findHotGoods();for (int i = 0; i < 10; i++) {System.out.println("商品序号:" + (i + 1) +"     商品名称：" + list.get(i).getName() +"     商品销量:" + list.get(i).getConsume());}System.out.println("选择序号可以查看详细信息：");int input = scanners.nextInt();if (0 < input && input <= 10) {detailedInformation(list, input);}}/*** 商品查询*/public void search() {System.out.println("1.品牌查询");System.out.println("2.价格查询");int input = scanners.nextInt();if(input==0)mainMenu();switch (input) {case 1:brandSearch();System.out.println("待输入");if(scanners.nextInt()==0)search();break;case 2:priceSearch();System.out.println("待输入");if(scanners.nextInt()==0)mainMenu();break;default:System.out.println("输入错误");System.out.println("待输入");if(scanners.nextInt()==0)mainMenu();}//显示查询菜单}/*** 品牌查询*/public void brandSearch() {System.out.println("请输入要查询的品牌：");String input = scanners.next();int brand=brandDao.nameChangeID(input);List<Goods> list1 = brandDao.findByName(brand);if (list1.size() == 0) {System.out.println("无法操作，序列为空");}else{for (int i = 0; i < list1.size(); i++) {System.out.println("商品序号:" + (i + 1) +"     商品名称:" + list1.get(i).getName() +"     商品销量:" + list1.get(i).getConsume());}System.out.println("选择序号可以查看详细信息：");int input2 = scanners.nextInt();detailedInformation(list1, input2);}}/*** 价格查询*/public void priceSearch() {System.out.println("请输入价格范围：（最小范围，最大范围）");int min = scanners.nextInt();int max = scanners.nextInt();List<Goods> goods = goodsDao.findByPrice(min, max);if (goods.size() == 0) {System.out.println("无法操作，序列为空");}else {for (int i = 0; i < goods.size(); i++) {System.out.println("商品序号:" + (i + 1) +"     商品名称：" + goods.get(i).getName() +"     商品销量:" + goods.get(i).getConsume()); }System.out.println("选择序号可以查看详细信息:");int input2 = scanners.nextInt();detailedInformation(goods, input2);}}/*** 商品管理*/public void goodsManage() {System.out.println("1.新增商品:");System.out.println("2.修改价格:");System.out.println("3.删除商品:");int input2 = scanners.nextInt();switch (input2) {case 1:addGoods();System.out.println("待输入:");if(scanners.nextInt()==0)goodsManage();break;case 2:modifyPrice();System.out.println("待输入:");if(scanners.nextInt()==0)goodsManage();break;case 3:deleteGoods();System.out.println("待输入:");if(scanners.nextInt()==0)goodsManage();break;case 0:mainMenu();break;}}/*** 新增商品*/public void addGoods() {System.out.println("请输入商品名称：");String name = scanners.next();System.out.println("请输入商品价格：");int price = scanners.nextInt();System.out.println("请输入商品品牌：");String brand = scanners.next();System.out.println("请输入商品类型：");String type = scanners.next();int n = brandDao.nameChangeID(brand);goodsDao.addDatabase(name, price, n, type);for (Goods goods : goodsDao.findAllGoods())System.out.println(goods.getGoodID() + "\t\t" + goods.getName() + "\t\t" + goods.getPrice() + "\t\t" + goods.getConsume() + "\t\t" + goods.getType());}/*** 修改价格*/public void modifyPrice() {allBrand();System.out.println("请输入要修改的商品序号：");int goodsId = scanners.nextInt();Goods goodsNew=goodsDao.findByFoodID(goodsId);Brand brandNew=brandDao.findByID(goodsNew.getBrandNumber());List  <Goods> list=brandShows(brandNew);System.out.println("输入新的价格:");int price = scanners.nextInt();System.out.println("是否保存:是按1，否按0");int bool = scanners.nextInt();if (bool == 1) {goodsDao.modify(goodsId, price);for (Goods goods : goodsDao.findAllGoods())System.out.println(goods.getGoodID() + "\t\t" + goods.getName() + "\t\t" + goods.getPrice() + "\t\t" + goods.getConsume() + "\t\t" + goods.getType());} else {return;}}/*** 删除商品*/public void deleteGoods () {allBrand();System.out.println("选择序号:");int input2 = scanners.nextInt();Goods good=goodsDao.findByFoodID(input2);Brand brand=brandDao.findByID(good.getBrandNumber());List  <Goods> list1=brandShows(brand);for (int i = 0; i < list1.size(); i++) {Goods goods = list1.get(i);System.out.println("序号:" + goods.getGoodID() +"      商品名称:" + goods.getName() +"       商品价格:" + goods.getPrice());}System.out.println("是否删除：是按1，否按0");int bool = scanners.nextInt();if (bool == 1) {goodsDao.delete(input2);for (Goods goods : goodsDao.findAllGoods())System.out.println(goods.getGoodID() + "\t\t" + goods.getName() + "\t\t" + goods.getPrice() + "\t\t" + goods.getConsume() + "\t\t" + goods.getType());}}public  void detailedInformation(List<Goods>list,int input){System.out.println("     商品名称:"+list.get(input-1).getName()+"" +"     商品品牌:"+brandDao.findByID(list.get(input-1).getBrandNumber()).getName()+"      价格："+list.get(input-1).getPrice()+"        类型："+list.get(input-1).getType());}public void   allBrand(){List<Goods>list=goodsDao.findAllGoods();for (int i = 0; i <list.size(); i++) {String brand=brandDao.idChangeName(list.get(i).getBrandNumber());System.out.println("商品名称:"+list.get(i).getName()+"          品牌序号:"+list.get(i).getBrandNumber()+"       品牌名称:"+brand);}}List<Goods> brandShows( Brand brand) {List<Goods> listNew = new ArrayList<>();List<Goods> list=goodsDao.findAllGoods();for (int i = 0; i < list.size(); i++) {if(brandDao.nameChangeID(brand.getName())==list.get(i).getBrandNumber()){listNew.add(list.get(i));}}for (int i = 0; i < listNew.size(); i++) {Goods goods = listNew.get(i);System.out.println("序号:" + goods.getGoodID() +"      商品名称:" + goods.getName() +"       商品价格:" + goods.getPrice());}return listNew;}}

第九步：

package com.igeek.service;
import com.igeek.data.Database;public class main {public static void main(String[] args) {Database database=new Database();GoodsService goodsService=new GoodsService(database);}
}

功能实现图