软件开发与创新 第二周实验

项目来源于 大一上的程序设计基础的期末大作业 用C语言实现《网上购书系统》通过阅读分析源码找出软件尚存的缺陷 改进其软件做二次开发

改程序正常启动程序后，显示所有库存商品，能够正常显示所有库存，添加新的商品入库，将商品加入购物车，结算，修改库存等功能。

#include <iostream>

using namespace std;
#include <string>
#include <sstream>
#include <vector>
#include  <fstream>
using namespace std;



class Goods
{
public:
    Goods(string t, double pr):title(t),price(pr) {}
    Goods(){}
    virtual ~Goods() {}
    virtual double getPrice()
    {
        return price;
    }
    virtual string getTitle()
    {
        return title;
    }
    virtual string getDetails()=0;
    virtual bool Init(ifstream &infile) = 0;  //从文件流中init
    virtual bool Init(string press){
        return true;
    }; //从控制台输入变量,函数重载
    virtual bool SaveToFile(ofstream &outfile) = 0;
public:
    string title;  //名称
    double price;
    string press; //id 扫描仪
};


class Book : public Goods
{
public:
    Book(string t, double pr):Goods(t,pr)
    {
        author ="Unknown";
        press = "Unknown";
        ISBN = "Unknown";
    }

    Book()
    {

    }
    ~Book() {}
    void setDetails(string au, string pr, string isbn)
    {
        author = au;
        press = pr;
        ISBN = isbn;
    }
    string getDetails()
    {
        ostringstream os;
        os<<"Title:"<<getTitle()<<" ";
        os<<"Author:"<<author<<" ";
        os<<"Press:"<<press<<" ";
        os<<"ISBN:"<<ISBN<<" ";
        os<<"Price:"<<getPrice()<<endl;
        return os.str();
    }

    bool Init(ifstream &infile)
    {
        //infile>>press;
        
        infile>>ISBN;
        
        infile>>title;
        
        infile>>author;    
        
        infile>>publish;
        
        infile>>price;
        //infile>>iStoreNum;
        return true;
    }

    bool Init(string strPress)
    {
        cout << "输入ISBN号" << endl;
        press = strPress;            
        cin>>ISBN;
        cout << "输入名称" << endl;
        cin>>title;    
        cout << "输入作者" << endl;
        cin>>author;    
        cout << "输入出版社" << endl;
        cin>>publish;
        cout << "输入价格" << endl;
        cin>>price;
        return true;
    };

    bool SaveToFile(ofstream &outfile)
    {    
        outfile<<press<< " ";            
        outfile<<ISBN<< " ";
        outfile<<title<< " ";    
        outfile<<author<< " ";    
        outfile<<publish<< " ";
        outfile<<price<< endl; 
        return true;    
    }

private:
    string author;   
    string ISBN;
    string publish;
};


//杂志
class Magazine : public Goods
{
public:
    Magazine(string t, double pr):Goods(t,pr)
    {
        issue = "Unknown";
        issNo = "Unknown";
        period = "Unknown";
    }
    Magazine()
    {}
    ~Magazine() {}
    void setDetails(string isn, string p,string is)
    {
        issue = is;
        issNo = isn;
        period = p;
    }
    string getDetails()
    {
        ostringstream os;
        os<<"Title:"<<getTitle()<<" ";
        os<<"IssueNo.:"<<issNo<<" ";
        os<<"Period:"<<period<<" ";
        os<<"Issue:"<<issue<<" ";
        os<<"Price:"<<getPrice()<<endl;
        return os.str();
    }
    //maga000001 CN11-2697/TP 文艺生活 每月 10期  11.5
    bool Init(ifstream &infile)
    {                
        infile>>issNo;
        infile>>title;    
        infile>>period;    
        infile>>issue;
        infile>>price;        
        return true;
    }

    bool Init(string strPress)
    {
        press = strPress;
        cout << "输入期刊号" << endl;
        cin>>issNo;
        cout << "输入名称" << endl;
        cin>>title;    
        cout << "输入期刊周期" << endl;
        cin>>period;
        cout << "输入期刊号" << endl;
        cin>>issue;
        cout << "输入价格" << endl;
        cin>>price;    
        return true;
    };

    bool SaveToFile(ofstream &outfile)
    {    
        outfile<<press<< " ";    
        outfile<< issNo<< " " ;
        outfile<< title<< " " ;    
        outfile<< period<< " " ;    
        outfile<< issue<< " " ;
        outfile<< price<<endl;        
        return true;
    }
private:
    string issue; //期号
    string issNo;
    string period;
};

class MusicCD : public Goods
{
public:
    MusicCD(string t, double p):Goods(t,p)
    {
        player = "Unknown";
        style = "Unknown";
        tracks = 0;
        lasttime = 0;
    }
    MusicCD() {}
    ~MusicCD() {}
    void setDetails(string p, string st,int tr, int t)
    {
        player = p;
        style = st;
        tracks = tr;
        lasttime = t;
    }
    string getDetails()
    {
        ostringstream os;
        os<<"Title:"<<getTitle()<<" ";
        os<<"Player:"<<player<<" ";
        os<<"Style:"<<style<<" ";
        os<<"Tracks:"<<tracks<<" ";
        os<<"LastTime:"<<lasttime<<"minitues ";
        os<<"Price:"<<getPrice()<<endl;
        return os.str();
    }

    //cd000001 不再犹豫 beyond 摇滚 28 50 18.00
    bool Init(ifstream &infile)
    {        
        infile>>title;    
        infile>>player;    
        infile>>style;
        infile>>tracks;
        infile>>lasttime;
        infile>>price;        
        return true;
    }

    bool Init(string strPress)
    {
        press = strPress;
        cout << "输入名称" << endl;
        cin>>title;    
        cout << "输入歌手" << endl;
        cin>>player;    
        cout << "输入风格" << endl;
        cin>>style;
        cout << "输入音轨数量" << endl;
        cin>>tracks;
        cout << "输入CD时长" << endl;
        cin>>lasttime;
        cout << "输入价格" << endl;
        cin>>price;    
        return true;
    };

    bool SaveToFile(ofstream &outfile)
    {
        outfile<<press<< " ";
        outfile<<title<< " ";    
        outfile<<player<< " ";    
        outfile<<style<< " ";
        outfile<<tracks<< " ";
        outfile<<lasttime<< " ";
        outfile<<price<<endl;
        return false;    
    }
private:
    string player;
    string style;
    int tracks;  //音轨
    int lasttime;
};


class BookStoreMgr
{
public:
    bool LoadStore(); //从文件加载数据
    bool SaveStore(); //保存数据
    int m_iItemNum;  //当前库存商品个数

    void ShowAllItems(); //显示所有商品
    Goods* FindStore(string strTitle); //根据名称查找商品
    bool DelStoreByPress(string strPress); //根据press id查找商品
    bool ChangeStore(string strPress); //修改库村商品信息
    Goods* FindStoreByPress(string strPress);  //查找商品
    
//private:
    vector<Goods*> items;   //所有的商品列表
};

void BookStoreMgr::ShowAllItems()
{
    vector<Goods*>::iterator itor;
    for (itor = items.begin(); itor != items.end(); itor++)
    {
        cout << (*itor)->getDetails() << endl;
                
    }

}


bool BookStoreMgr::LoadStore()
{
    try{
        std::ifstream infile("store.txt");
        infile >> m_iItemNum; 
        Goods* pGoods = NULL;
        for(int i=0;i < m_iItemNum;i++)
        {
            string press;
            infile>>press;
            if (press.find("book") == 0)
            {
                pGoods = new Book();
            }else if (press.find("maga") == 0){
                pGoods = new Magazine();
            }
            else if (press.find("cd") == 0){
                pGoods = new MusicCD();
            }
            else if (press.find("vcd") == 0){
                pGoods = new Video();                
            }else{
                continue;
            }
            pGoods->press = press;
            pGoods->Init(infile);
            items.push_back(pGoods);
        }
        infile.close();
    }
    catch(...){
        cout << "打开文件失败!" << endl;
        return false;

    }     


    return true;
}

bool BookStoreMgr::SaveStore()
{
    std::ofstream outfile("store.txt");    
    outfile << m_iItemNum << std::endl;
    for(int i = 0; i < m_iItemNum; i++)
    { 
        Goods *pGood = items[i];
        pGood->SaveToFile(outfile);        
    }
    outfile.close();
    return true;
}



//可以添加修改为模糊查询
Goods* BookStoreMgr::FindStore(string strTitle)
{
    vector<Goods*>::iterator itor;
    Goods *pGoods = NULL;
    bool bFind = false;
    for (itor = items.begin(); itor != items.end(); itor++)
    {
        if ((*itor)->title == strTitle)
        {
            cout << (*itor)->getDetails() << endl;    
            pGoods = (*itor);
            bFind = true;
            return pGoods;
        }                
    }
    cout << "找不到名称是" << strTitle << "的商品" << endl;
    return pGoods;
}


//可以添加修改为模糊查询
Goods* BookStoreMgr::FindStoreByPress(string strPress)
{
    vector<Goods*>::iterator itor;
    Goods *pGoods = NULL;
    bool bFind = false;
    for (itor = items.begin(); itor != items.end(); itor++)
    {
        if ((*itor)->press == strPress)
        {
            cout << (*itor)->getDetails() << endl;    
            pGoods = (*itor);
            bFind = true;
            return pGoods;
        }                
    }
    cout << "找不到名称是" << strPress << "的商品" << endl;
    return pGoods;
}



bool BookStoreMgr::DelStoreByPress(string strPress)
{
    vector<Goods*>::iterator itor;
    bool bFind = false;
    for (itor = items.begin(); itor != items.end(); itor++)
    {
        if ((*itor)->press == strPress)
        {
            cout << (*itor)->getDetails() << endl;
            items.erase(itor);
            bFind = true;
            m_iItemNum -= 1;
            SaveStore();
            cout << "成功删除press id是" << strPress << "的商品" << endl;
            return true;
        }                
    }
    cout << "找不到press id是" << strPress << "的商品" << endl;
    return false;
}

bool BookStoreMgr::ChangeStore(string strPress)
{
    vector<Goods*>::iterator itor;
    bool bFind = false;
    for (itor = items.begin(); itor != items.end(); itor++)
    {
        if ((*itor)->press == strPress)
        {
            cout << (*itor)->getDetails() << endl;
            (*itor)->Init(strPress);
            bFind = true;            
            SaveStore();
            cout << "成功删除press id是" << strPress << "的商品" << endl;
            return true;
        }                
    }
    cout << "找不到press id是" << strPress << "的商品" << endl;
    return true;
}




int main()
{
    const int N = 4;
    Cart myCart;

    BookStoreMgr storeMgr;
    storeMgr.LoadStore();
    int i = 0;
    while(1)
    {
        printf("     |-------------------------------------------------------------------|\n");
        printf("     |*****************************欢迎使用******************************|\n");
        printf("     |*******************中国图书影像制品销售管理系统********************|\n");
        printf("     |       1*客户结账                                                     |\n");
        printf("     |       2*商品入库                                                  |\n");
        printf("     |       3*根据名称查询                                              |\n");        
        printf("     |       4*删除商品                                                  |\n");            
        printf("     |       5*修改商品                                                  |\n");    
        printf("     |       6*显示所有商品                                              |\n");    
        printf("     |       7*退出系统                                                  |\n");    
        printf("     |    请选择:                                                        |\n");    
        printf("     |-------------------------------------------------------------------|\n");
        scanf("%d",&i);
        switch(i)//用swich-case语句:用于枚举选择
        {    
        case 1:
            {
                Cart cart;
                vector<string> vecCartPress;
                for(;;)
                {
                    cout << "请输入商品press id(输入ok结账)" << endl;
                    string strPress;
                    cin >> strPress;
                    if ("ok" == strPress){
                        cart.goodsList();
                        cout << "总共需要支付: " << cart.totalPrice() << endl;

                        //删除商品
                        for (int i = 0; i < vecCartPress.size(); i++)
                        {
                            storeMgr.DelStoreByPress(vecCartPress[i]);                        
                        }
                        break;
                    
                    }else{
                        Goods *pGoods = storeMgr.FindStoreByPress(strPress);
                        if (NULL != pGoods)
                        {
                            cart.addItem(pGoods);
                            vecCartPress.push_back(strPress);
                        }                    
                    }                
                }

            }
            break;
        case 2:
            {
                //商品入库
                cout << "请输入要入库的商品press ID:" << endl;    
                cout << "如book000016, maga000005, cd000004, vcd000005" << endl;    
                string press;
                cin>> press;
                Goods *pGoods = NULL;
                if (press.find("book") == 0)
                {
                    pGoods = new Book();
                }
                else if (press.find("maga") == 0)
                {
                    pGoods = new Magazine();
                }
                else if (press.find("cd") == 0)
                {
                    pGoods = new MusicCD();
                }
                
                else
                {
                    cout << "press id格式错误，请重新输入" << endl;
                    continue;
                }
                pGoods->Init(press);
                storeMgr.items.push_back(pGoods);
                storeMgr.m_iItemNum += 1;                
                storeMgr.SaveStore();

            }
            break;
        case 3:  //根据名称查询
            {
                //
                cout << "请输入名称:" << endl;
                string strTitle;
                cin >> strTitle;
                storeMgr.FindStore(strTitle);
                
            }            
            break;
        case 4:
            {
                cout << "请输入要删除的press id:" << endl;
                string strPress;
                cin >> strPress;
                storeMgr.DelStoreByPress(strPress);

            }            
            break;
        case 5:
            {
                cout << "请输入要修改的商品press id:" << endl;
                string strPress;
                cin >> strPress;
                storeMgr.ChangeStore(strPress);
            }            
            break;
        case 6:
            {
                storeMgr.ShowAllItems();
            }            
            break;    

        case 7:
            {
                exit(0);
            }            
            break;                
        default:
            {
                break;
            }

        }
    };
    
    char ch;
    cin >> ch;
}

 

Goods是商品基类，BookMagazine,MusicCD是子类。

BookStoreMgr是控制类，是面向对象的借口，封装了增删查改的操作并使用vector保存了所有的商品信息。

bool LoadStore(); //从文件加载数据

bool SaveStore(); //保存数据

int m_iItemNum;  //当前库存商品个数

void ShowAllItems(); //显示所有商品

Goods* FindStore(string strTitle); //根据名称查找商品

bool DelStoreByPress(string strPress); //根据press id查找商品

bool ChangeStore(string strPress); //修改库村商品信息

Goods* FindStoreByPress(string strPress);  //查找商品

private:

vector<Goods*> items;   //所有的商品列表

};

由于这个项目作为网上购书系统，适当应该从图书类商品拓展到类似于影像、碟片等商品。

所以在这边新加了 一个子类Video 类似的也可以添加别的更多门类的商品

 

class Video : public Goods
{
public:
    Video(string t, double p):Goods(t,p)
    {
        description = "Unknown";
        lasttime = 0;
    }
    Video() {}
    ~Video() {}
    void setDetails(int t, string des)
    {
        description = des;
        lasttime = t;
    }
    string getDetails()
    {
        ostringstream os;
        os<<"Title:"<<getTitle()<<" ";
        os<<"Description:"<<description<<" ";
        os<<"LastTime:"<<lasttime<<"minitues ";
        os<<"Price:"<<getPrice()<<endl;
        return os.str();
    }

    //vcd000001 笑傲江湖 168 10.00 令狐冲和东方不怕的故事
    bool Init(ifstream &infile)
    {    
        infile>>title;            
        infile>>lasttime;
        infile>>price;
        infile>>description;        
        return true;
    }

    bool Init(string strPress)
    {
        press = strPress;
        cout << "输入名称" << endl;
        cin>>title;
        cout << "输入VCD时长" << endl;
        cin>>lasttime;
        cout << "输入价格" << endl;
        cin>>price;
        cout << "输入描述(不要有空格)" << endl;
        cin>>description;
        return true;
    };

    bool SaveToFile(ofstream &outfile)
    {
        outfile<<press<< " ";
        outfile<<title<< " " ;            
        outfile<<lasttime<< " " ;
        outfile<<price<< " " ;
        outfile<<description<<endl ;
        return true;    
    }


private:
    string description;
    int lasttime; //分钟
};

class Cart
{
public:
    Cart() {}
    ~Cart() {}
    void addItem(Goods* g)
    {
        items.push_back(g);
    }
    double totalPrice()
    {
        double total = 0;
        for(unsigned int i=0; i<items.size(); i++)
            total += items[i]->getPrice();
        return total;
    }
    string goodsList()
    {
        string itemslist = "";
        for(unsigned int i=0; i<items.size(); i++)
            itemslist += items[i]->getDetails();
        return itemslist;
    }
private:
    vector<Goods*> items;
};



else if (press.find("vcd") == 0)
                {
                    pGoods = new Video();                
                }

这样已经可以添加video门类 本程序还有进行进一步优化 例如可以只展示部分的商品信息 隐藏刊号、cd时长等