控制台实现学生管理系统代码分享

登录

import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;

/**
 * @author gyf
 * @ClassName System
 * @Date 2024/8/4 15:31
 * @Version V1.0
 * @Description :
 */
public class Login {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        ArrayList<User> list = new ArrayList<>();
        while (true) {
            System.out.println("欢迎来到学生管理系统");
            System.out.println("请选择操作:1登录 2注册 3忘记密码 4退出");
            System.out.println("请输入你的选择:");
            String choose = scanner.next();
            switch (choose) {
                case "1" -> login(list);
                case "2" -> register(list);
                case "3" -> forgetpd(list);
                case "4" -> {
                    System.out.println("退出");
                    System.exit(0);
                }
                default -> System.out.println("你的输入不正确,请重新输入:");
            }
        }
    }

    // 登录
    private static void login(ArrayList<User> list) {
        Scanner scanner = new Scanner(System.in);
        for (int i = 0; i < 3; i++) {
            System.out.println("请输入要登录的用户名");
            String username = scanner.next();
            // 判断用户名是否存在
            boolean exist = contains(list, username);
            if (!exist) {
                System.out.println("您输入的用户名不存在,请先注册");
                return;
            }
            // 判断输入密码
            System.out.println("请输入登录的密码:");
            String pw = scanner.next();

            while (true) {
                String code = generateCode();
                System.out.println("请输入验证码：" + code);
                String inputcode = scanner.next();
                // 验证码忽略大小写
                if ((inputcode.equalsIgnoreCase(code))) {
                    System.out.println("验证码正确");
                    break;
                } else {
                    System.out.println("验证码输入不正确,请重新输入");
                    continue;
                }
            }
            // 当需要判断的参数比较多的时候 可以初始化一个对象 将对象传进去 然后通过对象获取属性进行判断
            boolean flag = chaeck(list, username, pw);
            if (flag) {
                System.out.println("用户名和密码正确，登陆成功");
                // 直接通过类调用方法
                StudentSystem.startStudentSystem();
                break;
            } else {
                System.out.println("用户名或密码错误，请重新输入");
                System.out.println("你还有的机会次数:" + (2 - i));
                if (i == 2) {
                    System.out.println("账户被锁定");
                    return;
                }
            }
        }
    }

    private static boolean chaeck(ArrayList<User> list, String username, String pw) {
        for (int i = 0; i < list.size(); i++) {
            String name = list.get(i).getUsername();
            String pwd = list.get(i).getPassword();
            if (name.equals(username) && pwd.equals(pw)) {
                return true;
            }
        }
        return false;
    }

    // 忘记密码
    private static void forgetpd(ArrayList<User> list) {
        // 1，键盘录入用户名，判断当前用户名是否存在，如不存在，直接结束方法，并提示:未注册
        //键盘录入身份证号码和手机号码2.
        //3，判断当前用户的身份证号码和手机号码是否一致，
        //如果一致，则提示输入密码，进行修改。
        //如果不一致，则提示:账号信息不匹配，修改失败。

        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要登录的用户名");
        String username = scanner.next();
        // 判断用户名是否存在
        boolean exist = contains(list, username);
        if (!exist) {
            System.out.println("您输入的用户名不存在,未注册");
            return;
        }

        System.out.println("请输入身份证号码：");
        String personID = scanner.next();
        System.out.println("请输入手机号码：");
        String phonenumber = scanner.next();
        // 只需要判断正确性即可
        boolean flag = checkIDnumber(list, username, personID, phonenumber);
        if (flag) {
            System.out.println("身份证和手机号输入正确");
        } else {
            System.out.println("身份证号和手机号输入有误");
            return;
        }
        String pw1;
        while (true) {
            System.out.println("请第一次输入新的密码");
            pw1 = scanner.next();
            System.out.println("请第二次输入新的密码");
            String pw2 = scanner.next();
            if (pw2.equals(pw1)) {
                System.out.println("密码输入一致");
                break;
            } else {
                System.out.println("密码不一致");
                continue;
            }
        }
        // 直接修改 先获取当前用户的对象
        int index = getIndex(list, username);
        User user = list.get(index);
        user.setPassword(pw1);
        System.out.println("密码重置成功");
        showUsers(list);
    }

    private static int getIndex(ArrayList<User> list, String username) {
        for (int i = 0; i < list.size(); i++) {
            User user = list.get(i);
            if (user.getUsername().equals(username)) {
                return i;
            }
        }
        return -1;
    }

    private static boolean checkIDnumber(ArrayList<User> list, String username, String personID, String phonenumber) {
        // 首先通过username  获取当前的对象 然后判断手机号和身份证号是否一致
        for (int i = 0; i < list.size(); i++) {
            User user = list.get(i);
            String name = user.getUsername();
            String ID = user.getPersonID();
            String ohnumber = user.getPhonenumber();
            if (username.equals(name)) {
                // 找到当前用户
                if (!(phonenumber.equals(ohnumber) && personID.equalsIgnoreCase(ID))) {
                    return false;
                }
            }
        }
        return true;
    }

    //注册
    private static void register(ArrayList<User> list) {
        Scanner scanner = new Scanner(System.in);
        User user = new User();
        // 输入用户名
        while (true) {
            // 分别对输入的信息做验证 先验证格式再验证是否唯一
            System.out.println("请输入用户名");
            String username = scanner.next();
            // 先验证格式
            boolean flag = checkname(username);
            if (!flag) {
                System.out.println("格式不正确,需要重新输入");
                continue;
            }
            //  唯一性：保证用户名唯一
            boolean only = contains(list, username);
            if (only) {
                System.out.println(username + ":内容不唯一,需要重新输入");
                continue;
            }
            System.out.println("您输入的用户名符合要求");
            user.setUsername(username);
            break;
        }
        // 两次输入密码一直才可以
        while (true) {
            System.out.println("第一次输入密码");
            String password1 = scanner.next();
            System.out.println("第二次输入密码");
            String password2 = scanner.next();
            if (password1.equals(password2)) {
                System.out.println("密码输入一致,符合要求");
                user.setPassword(password1);
                break;
            } else {
                System.out.println("密码输入不一致,请重新输入");
                continue;
            }
        }
        // 输入身份证号
        while (true) {
            System.out.println("请输入身份证号");
            String personid = scanner.next();
            boolean flag2 = checkPersonid(personid);

            if (!flag2) {
                System.out.println("输入的格式内容不正确,请重新输入");
                continue;
            } else {
                System.out.println("身份证号码输入满足要求");
                user.setPersonID(personid);
                break;
            }
        }
        // 输入手机号码
        while (true) {
            System.out.println("请输入手机号");
            String phonenumber = scanner.next();
            boolean flag3 = checkPhonenumber(phonenumber);
            if (flag3) {
                System.out.println("输入的手机号正确");
                user.setPhonenumber(phonenumber);
                break;
            } else {
                System.out.println("输入的手机号格式不对，重新输入");
                continue;
            }
        }
        // 用户对象添加到集合当中
        list.add(user);
        System.out.println("用户信息添加成功！");
        showUsers(list);
    }

    // 遍历用户
    private static void showUsers(ArrayList<User> list) {
        System.out.println("用户名" + "\t\t" + "密码" + "\t\t" + "身份证号" + "\t\t" + "手机号");
        for (int i = 0; i < list.size(); i++) {
            User user = list.get(i);
            System.out.println(user.getUsername() + "," + user.getPassword() + "," + user.getPersonID() + "," + user.getPhonenumber());
        }
    }

    // 检查手机号
    private static boolean checkPhonenumber(String phonenumber) {
        // 必须是十一位,第一位不为0,全部是数字
        int len = phonenumber.length();
        if (len != 11) {
            return false;
        }
        // 首位不为0
        char first = phonenumber.charAt(0);
        if (first == '0') {
            return false;
        }
        // 全是数字
        for (int i = 0; i < phonenumber.length(); i++) {
            char c = phonenumber.charAt(i);
            if (!(c >= '0' && c <= '9')) {
                return true;
            }
        }
        return true;
    }

    // 验证身份证号
    private static boolean checkPersonid(String personid) {
        // 输入身份中号，要求18位，不能以0开头,前17位必须是数字，最后一位可以是数字也可以是X或x
        // 验证位数
        int length = personid.length();
        if (length != 18) {
            return false;
        }
        // 判断第一位
//        boolean flag = personid.startsWith("0"); // 以0开头
        if (personid.charAt(0) == '0') {
            return false;
        }
        //验证内容前17位置的内容
        for (int i = 1; i < length - 1; i++) {
            char c = personid.charAt(i);
            if (!(c >= '0' && c <= '9')) {
                return false;
            }
        }
        // 判断最后一位内容
        char c = personid.charAt(length - 1);
        if (c == 'X' || c == 'x' || (c >= '0' && c <= '9')) {
            return true;
        } else {
            return false;
        }
    }

    // 判断用户名是否唯一
    private static boolean contains(ArrayList<User> list, String username) {
        for (int i = 0; i < list.size(); i++) {
            if (username.equals(list.get(i).getUsername())) {
                return true;
            }
        }
        return false;
    }

    // 用户名格式验证
    private static boolean checkname(String username) {
        // 格式：长度在3-15位，只能是字母和数字的组合，但又不能是纯数字。
        int length = username.length();
        int cout = 0;
        if (length < 3 || length > 15) {
            return false;
        }
        for (int i = 0; i < username.length(); i++) {
            char c = username.charAt(i);
            // 不是字母数字组合的话 返回false
            if (!((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9'))) {
                return false;
            }
            // 统计字母的个数,若存在一个则直接返回true;
            if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')) {
                cout++;
                break;
            }
        }
        return cout > 0;
    }

    // 生成一个验证码
    private static String generateCode() {
        Random random = new Random();
        StringBuilder sb = new StringBuilder();
        ArrayList<Character> list = new ArrayList<>();
        for (int i = 0; i < 26; i++) {
            list.add((char) ('a' + i));
            list.add((char) ('A' + i));
        }
        // 随机抽取四个字符拼接
        for (int i = 0; i < 4; i++) {
            int num1 = random.nextInt(list.size());
            sb.append(list.get(num1));
        }
        // 产生一个0-9的随机数字
        int num2 = random.nextInt(10);
        sb.append(num2);

        char[] chars = sb.toString().toCharArray();
        int randomindex = random.nextInt(chars.length);
        // 最大索引位置元素和随机索引交换
        char temp = chars[randomindex];
        chars[randomindex] = chars[chars.length - 1];
        chars[chars.length - 1] = temp;
        return new String(chars);
    }
}

/**
 * @author gyf
 * @ClassName Uswe
 * @Date 2024/8/4 15:47
 * @Version V1.0
 * @Description :
 */
public class User {
    private String username;
    private String password;
    private String personID;
    private String phonenumber;

    public User() {
    }

    public User(String username, String password, String personID, String phonenumber) {
        this.username = username;
        this.password = password;
        this.personID = personID;
        this.phonenumber = phonenumber;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getPersonID() {
        return personID;
    }

    public void setPersonID(String personID) {
        this.personID = personID;
    }

    public String getPhonenumber() {
        return phonenumber;
    }

    public void setPhonenumber(String phonenumber) {
        this.phonenumber = phonenumber;
    }
}

学生系统

import java.util.ArrayList;
import java.util.Scanner;

/**
 * @author gyf
 * @ClassName StudentSystem
 * @Date 2024/8/4 10:12
 * @Version V1.0
 * @Description :
 */
public class StudentSystem {
    public static void startStudentSystem() {
        Scanner scanner = new Scanner(System.in);
        // 创建集合 用于存储学生信息
        ArrayList<Student> list = new ArrayList<>();
        loop:
        while (true) {
            System.out.println("----欢迎来到学生管理系统----");
            System.out.println("1:添加学生");
            System.out.println("2:删除学生");
            System.out.println("3:修改学生");
            System.out.println("4:查询学生");
            System.out.println("5:退出");
            System.out.println("请输入您的选择:(输入数字)");
            String choose = scanner.next();
            switch (choose) {
                case "1" -> add(list);
                case "2" -> delete(list);
                case "3" -> update(list);
                case "4" -> query(list);
                case "5" -> {
                    System.out.println("退出");
                    break loop;
//                    System.exit(0); // 停止虚拟机运行
                }
                default -> System.out.println("你输入的选择不正确");
            }
        }
    }

    // 添加学生
    public static void add(ArrayList<Student> list) {
        // 添加的时候保证id 一致
        Scanner scanner = new Scanner(System.in);
        String id = null;
        while (true) {
            System.out.println("请输入添加的学生id:");
            id = scanner.next();
            boolean flag = contain(list, id);
            if (flag) {
                System.out.println("该id已经存在,重新输入");
            } else {
                break;
            }
        }
        System.out.println("请输入添加的学生姓名:");
        String name = scanner.next();
        System.out.println("请输入添加的学生年龄:");
        int age = scanner.nextInt();
        System.out.println("请输入添加的学生地址:");
        String address = scanner.next();
        Student student = new Student(id, name, age, address);
        list.add(student);
        System.out.println("添加学生信息成功");
    }

    // 删除学生
    public static void delete(ArrayList<Student> list) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入删除的学生id:");
        String id = scanner.next();
        int index = getIndex(list, id);
        if (index == -1) {
            System.out.println("您要删除的id不存在,即将回到初始菜单...");
        } else {
            // 首先获得索引 然后在删除
            list.remove(index);
            System.out.println("删除成功");
        }
    }

    // 修改学生
    public static void update(ArrayList<Student> list) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入修改的学生id:");
        String id = scanner.next();
        int index = getIndex(list, id);
        if (index == -1) {
            System.out.println("您要修改的id不存在,即将回到初始菜单...");
            return;
        }
        // 获取要修改的学生对象
        Student student = list.get(index);
        System.out.println("请输入添加的学生姓名:");
        String name = scanner.next();
        student.setName(name);
        System.out.println("请输入添加的学生年龄:");
        int age = scanner.nextInt();
        student.setAge(age);
        System.out.println("请输入添加的学生地址:");
        String address = scanner.next();
        student.setAddress(address);
        System.out.println("学生信息修改成功");

    }

    // 查询学生
    public static void query(ArrayList<Student> list) {
        if (list.size() == 0) {
            System.out.println("没有学生信息,请添加后再查询");
            return;
        }
        System.out.println("学生信息的个数为:" + list.size());
        System.out.println("id\t姓名\t年龄\t家庭住址");
        for (int i = 0; i < list.size(); i++) {
            System.out.println(list.get(i).getId() + "\t" + list.get(i).getName()
                    + "\t" + list.get(i).getAge() + "\t" + list.get(i).getAddress());

        }
    }

    // 判断 id是否在集合中存在
    public static boolean contain(ArrayList<Student> list, String id) {
/*        for (int i = 0; i < list.size(); i++) {
            if (list.get(i).getId().equals(id)){
                return true;
            }
        }
        return false;*/
        // 代码复用
        return getIndex(list, id) >= 0;
    }

    // 获取id的索引
    public static int getIndex(ArrayList<Student> list, String id) {
        for (int i = 0; i < list.size(); i++) {
            if (list.get(i).getId().equals(id)) {
                return i;
            }
        }
        return -1;
    }

}

/**
 * @author gyf
 * @ClassName Student
 * @Date 2024/8/4 10:10
 * @Version V1.0
 * @Description :
 */
public class Student {
    private String id;
    private String name;
    private int age;
    private String address;

    public Student() {
    }

    public Student(String id, String name, int age, String address) {
        this.id = id;
        this.name = name;
        this.age = age;
        this.address = address;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }
}