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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原文链接：https://blog.csdn.net/qq_39528702/article/details/111635369
文档来源：服务器之家http://www.zzvips.com/article/183858.html
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