学生信息管理系统管理员、用户注册登陆模块

Question

使用了map模板定义了map<int,User>user_map;

#include <iostream>
#include<string>
#include <map>
#include <fstream>
#include <algorithm>
#include "User.h"
using namespace std;
map<int,User>user_map;

void user_signin();
int main() {
    cout<<"欢迎使用本系统！"<<endl;
    cout<<"-----------------------------"<<endl;
    cout<<"1.管理员登陆"<<endl;
    cout<<"2.用户登陆"<<endl;
    cout<<"3.用户注册"<<endl;
    cout<<"4.退出"<<endl;
    cout<<"-----------------------------"<<endl;
    cout<<"请输入你的选择："<<endl;
    int choice;
    cin>>choice;
    switch (choice) {
        case 1:
            break;
        case 2:
            user_signin();
            break;
        case 3:
            break;
        case 4:
            break;
    }
return 0;
}

void user_signin(){
    cout<<"请输入账号："<<endl;
    User user;
    int i;
    cin>>i;
    user.set_id(i);
    cout<<"请输入密码："<<endl;
    int j;
    cin>>j;
    user.set_password(j);
    user_map.insert(map<int, User>::value_type(user.getid(),user));
}

这是User.h：

#ifndef MAIN_CPP_USER_H
#define MAIN_CPP_USER_H
#include <iostream>
using namespace std;

class User {
private:
    int id;
    int password;
public:
    User();
    User(int i,int p):id{i},password(p){
    };
    ~User();
    void set_id(int id){
        this->id=id;
    };
    int getid(){
        return id;
    }
    void set_password(int password){
        this->password=password;
    }
    int getpassword(){
        return password;
    }
};


#endif

怎么实现管理员，用户的注册登陆功能，而且要把管理员、用户的id 、password各自保存在txt文件中

Answer 1

#include <iostream>
#include <string>
#include <map>
#include <fstream>
#include <sstream>
#include <algorithm>
#include "User.h"
using namespace std;
map<int,User> user_map;
map<int,User> admin_map;
void user_signin();

void load_admin()
{
    ifstream fp("./admin.txt");
    if (!fp.is_open()) {
        return;
    }
    string line;
    while (getline(fp, line)) {
        stringstream ss;
        ss.str(line);
        User user;
        int id;
        string password;
        ss >> id >> password;
        user.set_id(id);
        user.set_password(password);
        admin_map.insert(map<int, User>::value_type(user.getid(),user));
    }
    fp.close();
}

void load_user()
{
    ifstream fp("./user.txt");
    if (!fp.is_open()) {
        return;
    }
    string line;
    while (getline(fp, line)) {
        stringstream ss;
        ss.str(line);
        User user;
        int id;
        string password;
        ss >> id >> password;
        user.set_id(id);
        user.set_password(password);
        user_map.insert(map<int, User>::value_type(user.getid(),user));
    }
    fp.close();
}

void save_admin()
{
    ofstream fp("./admin.txt");
    if (!fp.is_open()) {
        return;
    }
    for (map<int, User>::iterator it = admin_map.begin(); it != admin_map.end(); ++it) {
        fp << it->second.getid() << " " << it->second.getpassword() << endl;
    }
    fp.close();
}

void save_user()
{
    ofstream fp("./user.txt");
    if (!fp.is_open()) {
        return;
    }
    for (map<int, User>::iterator it = user_map.begin(); it != user_map.end(); ++it) {
        fp << it->second.getid() << " " << it->second.getpassword() << endl;
    }
    fp.close();
}

void admin_login() {
    cout<<"请输入账号："<<endl;
    int i;
    cin>>i;
    cout<<"请输入密码："<<endl;
    string password;
    cin>>password;
    map<int, User>::iterator it = admin_map.find(i);
    if (it == admin_map.end()) {
        cout << "管理员账号不存在" << endl;
        return;
    }
    if (it->second.getpassword() != password) {
        cout << "管理员密码不正确" << endl;
        return;
    }
    cout << "管理员登录成功" << endl;
}

void user_login() {
    cout<<"请输入账号："<<endl;
    int i;
    cin>>i;
    cout<<"请输入密码："<<endl;
    string password;
    cin>>password;
    map<int, User>::iterator it = user_map.find(i);
    if (it == user_map.end()) {
        cout << "用户账号不存在" << endl;
        return;
    }
    if (it->second.getpassword() != password) {
        cout << "用户密码不正确" << endl;
        return;
    }
    cout << "用户登录成功" << endl;
}

void user_signin(){
    cout<<"请输入账号："<<endl;
    User user;
    int i;
    cin>>i;
    if (user_map.find(i) != user_map.end()) {
        cout << "用户已存在" << endl;
        return;
    }
    user.set_id(i);
    cout<<"请输入密码："<<endl;
    string j;
    cin>>j;
    user.set_password(j);
    user_map.insert(map<int, User>::value_type(user.getid(),user));
}

int main() {
    load_admin();
    load_user();
    bool flag = true;
    while (flag) {
        cout<<"欢迎使用本系统！"<<endl;
        cout<<"-----------------------------"<<endl;
        cout<<"1.管理员登陆"<<endl;
        cout<<"2.用户登陆"<<endl;
        cout<<"3.用户注册"<<endl;
        cout<<"4.退出"<<endl;
        cout<<"-----------------------------"<<endl;
        cout<<"请输入你的选择："<<endl;
        int choice;
        cin>>choice;
        switch (choice) {
            case 1:
                admin_login();
                break;
            case 2:
                user_login();
                break;
            case 3:
                user_signin();
                break;
            case 4:
                flag = false;
                break;
        }
    }
    save_admin();
    save_user();
    return 0;
}

User.h

#ifndef MAIN_CPP_USER_H
#define MAIN_CPP_USER_H
#include <string>
using namespace std;

class User {
private:
    int id;
    string password;
public:
    User(){}
    User(int i,string p):id{i},password(p){
    };
    ~User(){}
    void set_id(int id){
        this->id=id;
    };
    int getid(){
        return id;
    }
    void set_password(string password){
        this->password=password;
    }
    string getpassword(){
        return password;
    }
};
 
#endif