Java实现商品管理系统代码实例讲解

实现功能：商品查询，新增，更改价格，以及删除

首先是三个基本类的构建

商品类、账号类、品牌类

1、商品类

public class Goods {
 //商品信息：商品名称，商品价格，商品销量，商品种类，商品品牌对应编号
 private String goodsName;
 private double goodsPrice;
 private int goodsSales;
 private String goodsCategories;
 private int brandsNum;
 private String GoodsNum;

 public Goods(String goodsName, double goodsPrice, int goodsSales, String goodsCategories,int brandsNum, String goodsNum) {
 this.goodsName = goodsName;
 this.goodsPrice = goodsPrice;
 this.goodsSales = goodsSales;
 this.goodsCategories = goodsCategories;
 this.brandsNum = brandsNum;
 GoodsNum = goodsNum;
 }

 public int getBrandsNum() {
 return brandsNum;
 }

 public void setBrandsNum(int brandsNum) {
 this.brandsNum = brandsNum;
 }

 public Goods() {
 }

 public String getGoodsNum() {
 return GoodsNum;
 }

 public void setGoodsNum(String goodsNum) {
 GoodsNum = goodsNum;
 }

 public String getGoodsName() {
 return goodsName;
 }

 public void setGoodsName(String goodsName) {
 this.goodsName = goodsName;
 }

 public double getGoodsPrice() {
 return goodsPrice;
 }

 public void setGoodsPrice(double goodsPrice) {
 this.goodsPrice = goodsPrice;
 }

 public int getGoodsSales() {
 return goodsSales;
 }

 public void setGoodsSales(int goodsSales) {
 this.goodsSales = goodsSales;
 }

 public String getGoodsCategories() {
 return goodsCategories;
 }

 public void setGoodsCategories(String goodsCategories) {
 this.goodsCategories = goodsCategories;
 }

 public int getBrands() {
 return brandsNum;
 }

 public void setBrands(int brandsNum) {
 this.brandsNum = brandsNum;
 }
}

实现了其各个属性的get和set方法

账户类

public class Accounts {
 //账户信息：账户名称，账户密码
 private String userName;
 private String userPassword;

 public Accounts(String userName, String userPassword) {
 this.userName = userName;
 this.userPassword = userPassword;
 }

 public Accounts() {
 }

 public String getUserName() {
 return userName;
 }

 public void setUserName(String userName) {
 this.userName = userName;
 }

 public String getUserPassword() {
 return userPassword;
 }

 public void setUserPassword(String userPassword) {
 this.userPassword = userPassword;
 }
}

品牌类

public class Brands {
 //商品品牌信息：商品品牌名称，商品品牌对应编号
 private String brandsName;
 private int brandsNum;

 public Brands(String brandsName, int brandsNum) {
 this.brandsName = brandsName;
 this.brandsNum = brandsNum;
 }

 public String getBrandsName() {
 return brandsName;
 }

 public void setBrandsName(String brandsName) {
 this.brandsName = brandsName;
 }

 public int getBrandsNum() {
 return brandsNum;
 }

 public void setBrandsNum(int brandsNum) {
 this.brandsNum = brandsNum;
 }
}

之后是一个存储这三个基本类信息的数据类，通过定义List实现三个类的存储

数据类

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

public class Database {
 //存储用户信息
 private List<Accounts>accountsList=new ArrayList<>();
 //存储商品信息
 private List<Goods>goodsList=new ArrayList<>();
 //存储品牌信息
 private List<Brands>brandsList=new ArrayList<>();
 public Database(){
 //添加初始化信息
 此处自己添加商品，用户信息，品牌信息
 }

 public List<Accounts> getAccountsList() {
 return accountsList;
 }

 public void setAccountsList(List<Accounts> accountsList) {
 this.accountsList = accountsList;
 }

 public List<Goods> getGoodsList() {
 return goodsList;
 }

 public void setGoodsList(List<Goods> goodsList) {
 this.goodsList = goodsList;
 }

 public List<Brands> getBrandsList() {
 return brandsList;
 }

 public void setBrandsList(List<Brands> brandsList) {
 this.brandsList = brandsList;
 }
}

之后是三个基本类各个增删改查方法的实现，这个根据程序需求写

商品交互类

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


public class GoodsDAO {
 //调用数据库
 private Database database;
 //初始化商品DAO类，引入数据库
 public GoodsDAO(Database database){
 this.database=database;
 }
 //返回销量最高的商品
 public List<Goods>hotSell(){
 List<Goods> temporList=database.getGoodsList();
 for(int i=0;i<temporList.size();i++){
 for(int j=0;j<temporList.size()-1-i;j++){
 if(temporList.get(j).getGoodsSales()<temporList.get(j+1).getGoodsSales())
 {
  Goods e=temporList.get(j+1);
  temporList.set(j+1,temporList.get(j));
  temporList.set(j,e);
 }
 }
 }
 return temporList;
 }
 //根据商品序号查询商品
 public Goods searchById(int id){
 Goods goods;
 goods=database.getGoodsList().get(id-1);
 return goods;
 }
 //根据品牌编号查询商品
 public List<Goods>searchByBranchId(int brandsId){
 List<Goods>temporList=new ArrayList<>();
 for(Goods each:database.getGoodsList()){
 if(each.getBrandsNum()==brandsId)
 temporList.add(each);
 }
 if(temporList.isEmpty())
 temporList=null;
 return temporList;
 }
 //根据价格区间查询商品
 public List<Goods>searchByPrice(double minPrice,double maxPrice){
 List<Goods>temporList=new ArrayList<>();
 for(Goods each:database.getGoodsList()){
 if(each.getGoodsPrice()>=minPrice&&each.getGoodsPrice()<=maxPrice) {
 temporList.add(each);
 }
 }
 if(temporList.isEmpty())
 temporList=null;
 return temporList;
 }
 //新增商品
 public void addGoods(Goods goods){
 database.getGoodsList().add(goods);
 }
 //修改商品价格
 public void modify(String goodsId,double price){
 for(Goods each:database.getGoodsList()){
 if(each.getGoodsNum().equals(goodsId))
 each.setGoodsPrice(price);
 }
 }
 //删除商品
 public void delete(String goodsId){
 Goods goods=null;
 for(Goods each:database.getGoodsList()){
 if(each.getGoodsNum().equals(goodsId))
 goods=each;
 }
 database.getGoodsList().remove(goods);
 //迭代操作时不允许ArrayList被改变，因此重新定义一个对象指向他，迭代完后进行操作。
 }
 //更改商品品牌编号
 public void changeByBranchId(int brandsId){
 for(Goods each:database.getGoodsList()){
 if(each.getBrandsNum()==brandsId)
 each.setBrandsNum(brandsId-1);
 }
 }
}

账户交互类实现注册，登录的需求

public class AccountDAO {
 //调用数据库
 private Database database;
 //初始化账户DAO类，引入数据库
 public AccountDAO(Database database){
 this.database=database;
 }
 //根据账户名返回账户类
 public Accounts searchAccounts(String userName){
 Accounts accounts=null;
 for(Accounts each:database.getAccountsList()){
 if(each.getUserName().equals(userName))
 accounts=each;
 }
 return accounts;
 }
 //添加账户类
 public void addAccount(Accounts accounts){
 database.getAccountsList().add(accounts);
 }
}

品牌类

public class BrandsDAO {
 //调用数据库
 private Database database;
 //初始化品牌DAO类，引入数据库
 public BrandsDAO(Database database){
 this.database=database;
 }
 //根据品牌名称查询
 public Brands findByName(String brandName){
 Brands brands=null;
 for(Brands each:database.getBrandsList()){
 if(each.getBrandsName().equals(brandName)) {
 brands = each;
 break;
 }
 }
 return brands;
 }
 //查询所有品牌
 public void findAll(){
 System.out.println("现有品牌：");
 for(Brands each:database.getBrandsList()){
 System.out.println(each.getBrandsNum()+"\t"+each.getBrandsName());
 }
 }
 //根据品牌编号查询品牌名称
 public String findNameById(int id){
 String brandName;
 Brands brands=null;
 for(Brands each:database.getBrandsList()){
 if(each.getBrandsNum()==id){
 brands=each;
 }
 }
 return brands.getBrandsName();
 }
 //查询品牌是否拥有
 public boolean findBranch(String brandsName){
 boolean choose=false;
 for(Brands each:database.getBrandsList())
 {
 if(each.getBrandsName().equals(brandsName))
 choose=true;
 }
 return choose;
 }
 //新建一个品牌
 public void addBranch(Brands brands){
 database.getBrandsList().add(brands);
 }
 //查找当前品牌的的数量
 public int brandsNumbers(){
 int num=database.getBrandsList().size();
 return num;
 }
 //查找要删除的品牌
 public void deleteBrands(int num){
 Brands brands=null;
 for(Brands each:database.getBrandsList()){
 if(each.getBrandsNum()==num)
 brands=each;
 }
 database.getBrandsList().remove(brands);
 }
 //移动编号
 public void moveBrandsNum(int brandsNum){
 int index;
 for(int i=0;i<database.getBrandsList().size();i++){
 if(database.getBrandsList().get(i).getBrandsNum()>brandsNum)
 database.getBrandsList().get(i).setBrandsNum(database.getBrandsList().get(i).getBrandsNum()-1);
 }
 }
}

服务类实现项目需要的功能，构建交互界面

public class GoodsSystem {
 Scanner scanner=new Scanner(System.in);
 Random random=new Random();
 AccountDAO accountDAO;
 BrandsDAO brandsDAO;
 GoodsDAO goodsDAO;
 //初始化DAO
 public GoodsSystem(Database database){
 accountDAO=new AccountDAO(database);
 brandsDAO=new BrandsDAO(database);
 goodsDAO=new GoodsDAO(database);
 }
 public void start(){
// 1.登陆
 System.out.println("----------------商品系统---------------");
 System.out.println("1.登录");
// 2.注册
 System.out.println("2.注册");
// 3.退出系统
 System.out.println("3.退出系统");
 System.out.println("请选择：");
 String choose=scanner.next();
 switch(choose){
 //登录
 case "1":
 login();
 break;
 //注册
 case "2":
 regist();
 break;
 //退出系统
 case "3":
 System.out.println("系统已经退出");
 break;
 default:
 System.out.println("输入错误，请重新输入：");
 start();
 }
 }
 //登录
 public void login(){
 System.out.println("请输入用户名：");
 String userName=scanner.next();
 System.out.println("请输入密码：");
 String passWord=scanner.next();
 Accounts accounts=accountDAO.searchAccounts(userName);
 String testNum="";
 if(accounts!=null){
 if(accounts.getUserPassword().equals(passWord)){
 for(int i=0;i<4;i++){
  int num=random.nextInt(10);
  testNum=testNum+num;
 }
 System.out.println("验证码："+testNum);
 System.out.println("请输入验证码：");
 String testNumInput=scanner.next();
 if(testNumInput.equals(testNum)) {
  System.out.println("登录成功");
  mainMenu();
 }
 else{
  System.out.println("验证码错误，请重新登录");
  login();
 }
 }
 else{
 System.out.println("密码错误，请重新登录");
 System.out.println("输入任意键执行操作，或输入0返回上一层目录");
 String choose=scanner.next();
 if(choose.equals("0"))
  start();
 else
  login();
 }
 }
 else{
 System.out.println("该账户不存在，请重新输入：");
 System.out.println("输入任意键执行操作，或输入0返回上一层目录");
 String choose=scanner.next();
 if(choose.equals("0"))
 start();
 else
 login();
 }
 }
 //注册
 public void regist(){
 System.out.println("----注册----");
 //用户名
 System.out.println("请输入用户名：");
 String userName=scanner.next();
 Accounts accounts=accountDAO.searchAccounts(userName);
 while(accounts!=null){
 System.out.println("用户名已经被使用，请重新输入");
 userName=scanner.next();
 accounts=accountDAO.searchAccounts(userName);
 }
 //密码
 System.out.println("请输入密码：");
 String userPassWord=scanner.next();
 System.out.println("确认密码：");
 String testPassWord=scanner.next();
 while(!userPassWord.equals(testPassWord)){
 System.out.println("确认密码与注册密码不相符，请重新输入密码");
 System.out.println("请输入密码：");
 userPassWord=scanner.next();
 System.out.println("确认密码：");
 testPassWord=scanner.next();
 }
 //验证码
 String testNum="";
 for(int i=0;i<4;i++){
 int num=random.nextInt(10);
 testNum=testNum+num;
 }
 System.out.println("验证码："+testNum);
 System.out.println("请输入验证码：");
 String testNumInput=scanner.next();
 if(testNumInput.equals(testNum)) {
 accountDAO.addAccount(new Accounts(userName,userPassWord));
 System.out.println("注册成功");
 start();
 }
 else{
 System.out.println("验证码错误，请重新注册");
 System.out.println("输入任意键执行操作，或输入0返回上一层目录");
 String choose=scanner.next();
 if(choose.equals("0"))
 start();
 else
 regist();
 }
 }
 //主菜单
 public void mainMenu(){
 System.out.println("-------------主菜单------------");
// 1.热门商品
 System.out.println("1.热门商品");
// 2.商品查询
 System.out.println("2.商品查询");
// 3.后台管理
 System.out.println("3.后台管理");
 System.out.println("4.退出系统");
 System.out.println("请输入你的选择：");
 String choose=scanner.next();
 switch (choose){
 case "1"://热门商品
 hotSell();
 break;
 case "2"://商品查询
 searchGoods();
 break;
 case "3"://后台管理
 controlGoods();
 break;
 case "4"://退出系统
 System.out.println("系统已经退出");
 break;
 default:
 mainMenu();
 }
 }
 //热卖商品
 public void hotSell(){
 System.out.println("------------热销商品------------");
 List <Goods>tempor=goodsDAO.hotSell();
 System.out.println("序号\t\t"+"商品"+"\t\t\t\t\t销量\t");
 int num=10;
 if(tempor.size()<10)
 num=tempor.size();
 for(int i=0;i<num;i++){
 System.out.println((i+1)+"\t\t"+tempor.get(i).getGoodsName()+"\t\t\t\t\t"+tempor.get(i).getGoodsSales()+"\t");
 }
 System.out.println("请输入要查询的商品ID或输入0返回上一层菜单。");
 String chooseEnd=scanner.next();
 if(isNumeric(chooseEnd)==true)
 {
 int choose=Integer.parseInt(chooseEnd);
 if(choose==0){
 mainMenu();
 }
 else
 {
 if(choose<=num&&choose>=0) {
  Goods goods = goodsDAO.searchById(choose);
  System.out.println("商品名称\t\t品牌\t\t价格\t\t类型");
  System.out.println(goods.getGoodsName() + "\t\t\t" + brandsDAO.findNameById(goods.getBrandsNum()) + "\t" + goods.getGoodsPrice() + "元\t" + goods.getGoodsCategories());
  mainMenu();
 }
 else
 {
  System.out.println("查询的序号超过限定，请重新输入");
  hotSell();
 }
 }
 }
 else
 {
 System.out.println("输入错误符号，请重新选择");
 hotSell();
 }
 }
 //商品查询
 public void searchGoods(){
 System.out.println("---------商品查询----------");
// 1.品牌查询
 System.out.println("1.品牌查询");
// 2.价格查询
 System.out.println("2.价格查询");
 System.out.println("3.返回上一层目录");
 System.out.println("请输入你的选择：");
 String choose=scanner.next();
 switch(choose){
 case "1"://品牌查询
 searchByBranch();
 break;
 case "2"://价格查询
 searchByPrice();
 break;
 case "3":
 mainMenu();
 break;
 default:
 searchGoods();
 }
 }
 //后台管理
 public void controlGoods(){
 System.out.println("--------后台管理--------");
// 1.新增商品
 System.out.println("1.新增商品");
// 2.修改价格
 System.out.println("2.修改价格");
// 3.删除商品
 System.out.println("3.删除商品");
 System.out.println("4.返回主菜单");
 System.out.println("请输入选择：");
 String choose=scanner.next();
 switch (choose){
 case "1"://新增商品
 addGoods();
 break;
 case "2"://修改价格
 changePrice();
 break;
 case "3"://删除商品
 deleteGoods();
 break;
 case "4"://返回主菜单
 mainMenu();
 break;
 default:
 controlGoods();
 }
 }
 //根据品牌查询
 public void searchByBranch(){
 brandsDAO.findAll();
 System.out.println("请输入要查询的品牌编号：");
 String brandsNum1=scanner.next();
 if(isNumeric(brandsNum1)) {
 int brandsNum=Integer.parseInt(brandsNum1);
 List<Goods> temporlist = goodsDAO.searchByBranchId(brandsNum);
 if (temporlist == null) {
 System.out.println("没有该品牌的商品");
 searchGoods();
 }
 for (int i = 0; i < temporlist.size(); i++) {
 System.out.println("序号" + (i + 1) + "\t" + "商品名字：" + temporlist.get(i).getGoodsName());
 }
 System.out.println("请输入要查询的商品ID或输入0返回上一层菜单。");
 String choose1 = scanner.next();
 if(isNumeric(choose1)) {
 int choose=Integer.parseInt(choose1);
 if (choose == 0) {
  searchGoods();
 } else {
  if(choose>=1&&choose<=temporlist.size()){
  Goods goods = temporlist.get(choose - 1);
  System.out.println("商品名称:" + goods.getGoodsName() + "\t" + "品牌:" + brandsDAO.findNameById(goods.getBrandsNum()) + "\t" + "价格:" + goods.getGoodsPrice() + "元\t" + "类型：" + goods.getGoodsCategories());
  searchGoods();
  }
  else{
  System.out.println("输入序号超过边界范围，请重新输入");
  searchByBranch();
  }
 }
 }
 else{
 System.out.println("输入错误符号，请重新选择");
 searchByBranch();
 }
 }
 else{
 System.out.println("输入错误符号，请重新选择");
 searchByBranch();
 }
 }
 //根据价格查询
 public void searchByPrice(){
 System.out.println("请输入要查询的价格区间:最小价格 最大价格");
 double minPrice=scanner.nextDouble();
 double maxPrice=scanner.nextDouble();
 List<Goods>temporlist=goodsDAO.searchByPrice(minPrice,maxPrice);
 if(temporlist==null){
 System.out.println("没有该区间的商品");
 searchGoods();
 }
 for(int i=0;i<temporlist.size();i++){
 System.out.println("序号"+(i+1)+"\t"+"商品名字："+temporlist.get(i).getGoodsName());
 }
 System.out.println("请输入要查询的商品ID或输入0返回上一层菜单。");
 String choose1 = scanner.next();
 if(isNumeric(choose1)) {
 int choose=Integer.parseInt(choose1);
 if (choose == 0) {
 searchGoods();
 }
 else {
 if(choose>=1&&choose<=temporlist.size()) {
  Goods goods = temporlist.get(choose - 1);
  System.out.println("商品名称:" + goods.getGoodsName() + "\t" + "品牌:" + brandsDAO.findNameById(goods.getBrandsNum()) + "\t" + "价格:" + goods.getGoodsPrice() + "元\t" + "类型：" + goods.getGoodsCategories());
  searchGoods();
 }
 else{
  System.out.println("输入数字超过边界，请重新输入");
  searchByPrice();
 }
 }
 }
 else{
 System.out.println("输入错误符号，请重新选择");
 searchByPrice();
 }
 }
 //新增商品
 public void addGoods(){
 System.out.println("请输入商品名称：");
 String goodsName=scanner.next();
 System.out.println("请输入商品价格：");
 double goodsPrice=scanner.nextDouble();
 System.out.println("请输入品牌");
 String brandsName=scanner.next();
 int brandsNum;
 if(brandsDAO.findBranch(brandsName)){
 brandsNum=brandsDAO.findByName(brandsName).getBrandsNum();
 }
 else{
 brandsNum=brandsDAO.brandsNumbers()+1;
 Brands brands=new Brands(brandsName,brandsNum);
 brandsDAO.addBranch(brands);
 }
 System.out.println("请输入商品类型");
 String goodsCate=scanner.next();
 Goods goods=new Goods(goodsName,goodsPrice,0,goodsCate,brandsNum, UUID.randomUUID().toString());
 goodsDAO.addGoods(goods);
 System.out.println("商品添加成功");
 controlGoods();
 }
 //改变价格
 public void changePrice(){
 System.out.println("--------修改价格------");
 brandsDAO.findAll();
 System.out.println("请输入要查询的品牌编号：");
 String brandsNum1=scanner.next();
 if(isNumeric(brandsNum1)) {
 int brandsNum=Integer.parseInt(brandsNum1);
 List<Goods> temporlist = goodsDAO.searchByBranchId(brandsNum);
 if (temporlist == null) {
 System.out.println("没有该品牌的商品");
 changePrice();
 }
 for (int i = 0; i < temporlist.size(); i++) {
 System.out.println("序号" + (i + 1) + "\t" + "商品名字：" + temporlist.get(i).getGoodsName() + "\t价格" + temporlist.get(i).getGoodsPrice() + "元");
 }
 System.out.println("请输入要修改价格的商品ID或输入0返回上一层菜单。");
 String choose1 = scanner.next();
 if(isNumeric(choose1)) {
 int choose=Integer.parseInt(choose1);
 if (choose == 0) {
  controlGoods();
 }
 else if(choose<=temporlist.size())
 {
  System.out.println("请输入要修改的价格：");
  double price = scanner.nextDouble();
  System.out.println("是否确定修改价格：是/否");
  String endChoose = scanner.next();
  if (endChoose.equals("是")) {
  goodsDAO.modify(temporlist.get(choose - 1).getGoodsNum(), price);
  System.out.println("价格修改完成");
  controlGoods();
  } else {
  controlGoods();
  }
 }
 else{
  System.out.println("输入序号超过边界，请重新输入");
  changePrice();
 }
 }
 else{
 System.out.println("输入错误符号，请重新输入");
 changePrice();
 }
 }
 else{
 System.out.println("输入错误符号，请重新输入");
 changePrice();
 }
 }
 //删除商品
 public void deleteGoods(){
 System.out.println("--------删除商品------");
 brandsDAO.findAll();
 System.out.println("请输入要查询的品牌编号：");
 String brandsNum2=scanner.next();
 if(isNumeric(brandsNum2)) {
 int brandsNum=Integer.parseInt(brandsNum2);
 List<Goods> temporlist = goodsDAO.searchByBranchId(brandsNum);
 if (temporlist == null) {
 System.out.println("没有该品牌的商品");
 deleteGoods();
 }
 for (int i = 0; i < temporlist.size(); i++) {
 System.out.println("序号" + (i + 1) + "\t" + "商品名字：" + temporlist.get(i).getGoodsName());
 }
 System.out.println("请输入要删除的商品ID或输入0返回上一层菜单。");
 String choose1 = scanner.next();
 if(isNumeric(choose1)) {
 int choose=Integer.parseInt(choose1);
 if (choose == 0) {
  controlGoods();
 }
 else if(choose<=temporlist.size()){
  System.out.println("是否确定删除：是/否");
  String endChoose = scanner.next();
  if (endChoose.equals("是")) {
  int brandsNum1 = temporlist.get(choose - 1).getBrandsNum();
  goodsDAO.delete(temporlist.get(choose - 1).getGoodsNum());
  System.out.println("删除成功");
  if (goodsDAO.searchByBranchId(brandsNum1) == null) {
  brandsDAO.deleteBrands(brandsNum1);
  brandsDAO.moveBrandsNum(brandsNum1);
  for (int i = brandsNum1; i <= brandsDAO.brandsNumbers(); i++)
  goodsDAO.changeByBranchId(i + 1);
  }
  controlGoods();
  } else {
  controlGoods();
  }
 }
 else{
  System.out.println("输入序号超过边界，请重新输入");
  deleteGoods();
 }
 }
 else{
 System.out.println("输入错误符号，请重新输入");
 deleteGoods();
 }
 }
 else{
 System.out.println("输入错误符号，请重新输入");
 deleteGoods();
 }
 }
 public boolean isNumeric(String str){
 for (int i = str.length();--i>=0;){
 if (!Character.isDigit(str.charAt(i))){
 return false;
 }
 }
 return true;
 }
}

注：以上代码部分内部类的导入未填写
还需要一个测试类运行
暂且略过

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