Java 学生管理系统代码（留作纪念）

迷南。 2024-03-22 17:23 48阅读 0赞

//main方法入口

package com.itheima.test;
    
    import java.util.ArrayList;
    import java.util.Random;
    import java.util.Scanner;
    
    public class StudentManager {
        public static void main(String[] args) {
            ArrayList<User> list = new ArrayList<>();
            loop:while (true) {
                char ch = loginInterface();
                switch (ch) {
                    case '1':
                        boolean flag = login(list);
                        if(flag){
                            break loop;
                        }else{
                            break;
                        }
                    case '2':
                        register(list);
                        break;
                    case '3':
                        forgetPassword(list);
                        break;
                }
            }
    
            ArrayList<Student> list1 = new ArrayList<>();
            loop1:
            while (true) {
                int i = menu();
                switch (i) {
                    case 1:
                        add(list1);
                        break;
                    case 2:
                        delete(list1);
                        break;
                    case 3:
                        change(list1);
                        break;
                    case 4:
                        search(list1);
                        break;
                    case 5:
                        break loop1;
                }
            }
        }
    
        //输入字符串
        public static String inputString() {
            Scanner sc = new Scanner(System.in);
            String String = sc.nextLine();
            return String;
        }
    
        //主菜单
        public static int menu() {
            System.out.println("-----欢迎来到黑马学生管理系统-----");
            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：");
            Scanner sc = new Scanner(System.in);
            int i = sc.nextInt();
            if (i >= 1 && i <= 5) {
                return i;
            } else {
                System.out.println("输入错误，请重新输入");
                return -1;
            }
        }
    
        //校验id是否存在
        public static int isIdExist(ArrayList<Student> list, String id) {
            for (int i = 0; i < list.size(); i++) {
                if (list.get(i).getId().equals(id)) {
                    return i;
                }
            }
            return -1;
        }
    
        //添加学生信息
        public static void add(ArrayList<Student> list) {
            System.out.println("请输入id");
            String str = inputString();
            int i = isIdExist(list, str);
            if (i != -1) {
                System.out.println("id已经存在，无法录入");
                return;
            }
            System.out.println("请输入姓名");
            String str1 = inputString();
            System.out.println("请输入年龄");
            String str2 = inputString();
            System.out.println("请输入地址");
            String str3 = inputString();
            Student s = new Student();
            s.setId(str);
            s.setName(str1);
            s.setAge(Integer.parseInt(str2));
            s.setAddress(str3);
            list.add(s);
        }
    
        //删除
        public static void delete(ArrayList<Student> list) {
            System.out.println("请输入id");
            String str = inputString();
            int i = isIdExist(list, str);
            if (i != -1) {
                list.remove(i);
            } else {
                System.out.println("id不存在");
            }
        }
    
        //修改
        public static void change(ArrayList<Student> list) {
            System.out.println("请输入id");
            String str = inputString();
            int i = isIdExist(list, str);
            if (i != -1) {
                System.out.println("请输入姓名");
                String str1 = inputString();
                System.out.println("请输入年龄");
                String str2 = inputString();
                System.out.println("请输入地址");
                String str3 = inputString();
                Student s = new Student();
                s.setId(str);
                s.setName(str1);
                s.setAge(Integer.parseInt(str2));
                s.setAddress(str3);
                list.set(i, s);
            } else {
                System.out.println("id不存在");
            }
        }
    
        //查找
        public static void search(ArrayList<Student> list) {
            if (list.size() > 0) {
                System.out.println("id\t\t姓名\t年龄\t家庭地址");
                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());
                }
            } else {
                System.out.println("没有学生信息");
            }
        }
    
        //登录界面
        public static char loginInterface() {
            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");
                System.out.println("请输入选线");
                String str = inputString();
                if(str.charAt(0) >= '1' && str.charAt(0) <= '3'){
                    return str.charAt(0);
                }else{
                    System.out.println("输入错误，请重新输入");
                }
            }
        }
    
        public static int isNameExist(ArrayList<User> list, String name) {
            for (int i = 0; i < list.size(); i++) {
                if (list.get(i).getName().equals(name)) {
                    return i;
                }
            }
            return -1;
        }
    
        //注册
        public static void register(ArrayList<User> list) {
            String str = new String();
            String str1 = new String();
            String str2 = new String();
            String str3 = new String();
            loop:
            while (true) {
                System.out.println("请输入用户名");
                str = inputString();
                int i = isNameExist(list, str);
                if (i != -1) {
                    System.out.println("用户名已经存在，请重新取名");
                    continue loop;
                }
                if (str.length() < 3 || str.length() > 15) {
                    System.out.println("长度不符合要求，请重新取名");
                    continue loop;
                }
                for (int i1 = 0; i1 < str.length(); i1++) {
                    char ch = str.charAt(i1);
                    if (ch < '0' || (ch > '9' && ch < 'A') || (ch > 'Z' && ch < 'a') || ch > 'z') {
                        System.out.println("用户名不符合要求，请重新取名");
                        continue loop;
                    }
                }
                boolean flag = false;
                for (int i1 = 0; i1 < str.length(); i1++) {
                    char ch = str.charAt(i1);
                    if ((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z')) {
                        flag = true;
                    }
                }
                if (!flag) {
                    System.out.println("用户名不符合要求，请重新取名");
                    continue loop;
                }
                break loop;
            }
            loop1:
            while (true) {
                System.out.println("请输入密码");
                str1 = inputString();
                System.out.println("请再次输入密码");
                String str4 = inputString();
                if (!str1.equals(str4)) {
                    System.out.println("两次密码输入不一致，请重新输入");
                    continue loop1;
                }
                break loop1;
            }
            loop2:
            while (true) {
                System.out.println("请输入身份证号码");
                str2 = inputString();
                if (str2.length() != 18) {
                    System.out.println("输入身份证格式不对，请重新输入");
                    continue loop2;
                }
                if (str2.charAt(0) == '0') {
                    System.out.println("输入身份证格式不对，请重新输入");
                    continue loop2;
                }
                for (int i = 0; i < str2.length() - 1; i++) {
                    if (str2.charAt(i) < '0' || str2.charAt(i) > '9') {
                        System.out.println("输入身份证格式不对，请重新输入");
                        continue loop2;
                    }
                }
                if (str2.charAt(str2.length() - 1) != 'x' && str2.charAt(str2.length() - 1) != 'X'
                        && !(str2.charAt(str2.length() - 1) >= '0' && str2.charAt(str2.length() - 1) <= '9')) {
                    System.out.println("输入身份证格式不对，请重新输入");
                    continue loop2;
                }
                break loop2;
            }
            loop3:
            while (true) {
                System.out.println("请输入手机号码");
                str3 = inputString();
                if (str3.length() != 11) {
                    System.out.println("输入手机号格式不对，请重新输入");
                    continue loop3;
                }
                if (str3.charAt(0) == '0') {
                    System.out.println("输入手机号格式不对，请重新输入");
                    continue loop3;
                }
                for (int i = 0; i < str3.length(); i++) {
                    if (!(str3.charAt(i) >= '0' && str3.charAt(i) <= '9')) {
                        System.out.println("输入手机号格式不对，请重新输入");
                        continue loop3;
                    }
                }
                break loop3;
            }
            User u = new User(str, str1, str2, str3);
            list.add(u);
        }
    
        //登录
        public static boolean login(ArrayList<User> list) {
            loop:
            for (int i = 0; i < 3; i++) {
                if (i < 3) {
                    System.out.println("还剩下" + (3 - i) + "次机会");
                }
                System.out.println("请输入用户名");
                String str = inputString();
                System.out.println("请输入密码");
                String str1 = inputString();
                //产生验证码---
                String str2 = securityCode();
                System.out.println(str2);
                System.out.println("请输入验证码");
                String str3 = inputString();
                int i1 = isNameExist(list, str);
                if (i1 == -1) {
                    System.out.println("用户名未注册，请先注册");
                    return false;
                }
                //判断验证码是否正确
                if(!str2.equals(str3)){
                    continue;
                }
                if (!list.get(i1).getPassword().equals(str1)) {
                    continue;
                }
                return true;
            }
            System.out.println("3次机会用玩，请稍后尝试");
            return false;
        }
    
        //忘记密码
        public static void forgetPassword(ArrayList<User> list) {
            System.out.println("请输入用户名");
            String str = inputString();
            System.out.println("请输入身份证");
            String str1 = inputString();
            System.out.println("请输入手机");
            String str2 = inputString();
            int i1 = isNameExist(list, str);
            if (i1 == -1) {
                System.out.println("用户名未注册，请先注册");
                return;
            }
            if (!list.get(i1).getId().equals(str1) || !list.get(i1).getPhone().equals(str2)) {
                System.out.println("账号信息不匹配，修改失败");
                return;
            }
            System.out.println("请输入新密码");
            String str3 = inputString();
            list.get(i1).setPassword(str3);
            System.out.println("修改成功");
        }
    
        //生成验证码
        public static String securityCode() {
            Random r = new Random();
            char[] chs = new char[5];
            for (int i = 0; i < chs.length - 1; i++) {
                char ch = (char) (r.nextInt(26) + 'a');
                char ch1 = (char) (r.nextInt(26) + 'A');
                int i1 = r.nextInt(2);
                if (i1 == 0) {
                    chs[i] = ch;
                } else {
                    chs[i] = ch1;
                }
            }
            char ch3 = (char) (r.nextInt(10) + '0');
            chs[chs.length - 1] = ch3;
            int i = r.nextInt(5);
            char ch = 0;
            ch = chs[chs.length - 1];
            chs[chs.length - 1] = chs[i];
            chs[i] = ch;
            String str = new String(chs);
            return str;
        }
    }

//用户类

package com.itheima.test;
    
    public class User {
        private String name;
        private String password;
        private String id;
        private String phone;
    
        public User() {
        }
    
        public User(String name, String password, String id, String phone) {
            this.name = name;
            this.password = password;
            this.id = id;
            this.phone = phone;
        }
    
        /**
         * 获取
         * @return name
         */
        public String getName() {
            return name;
        }
    
        /**
         * 设置
         * @param name
         */
        public void setName(String name) {
            this.name = name;
        }
    
        /**
         * 获取
         * @return password
         */
        public String getPassword() {
            return password;
        }
    
        /**
         * 设置
         * @param password
         */
        public void setPassword(String password) {
            this.password = password;
        }
    
        /**
         * 获取
         * @return id
         */
        public String getId() {
            return id;
        }
    
        /**
         * 设置
         * @param id
         */
        public void setId(String id) {
            this.id = id;
        }
    
        /**
         * 获取
         * @return phone
         */
        public String getPhone() {
            return phone;
        }
    
        /**
         * 设置
         * @param phone
         */
        public void setPhone(String phone) {
            this.phone = phone;
        }
    
        public String toString() {
            return "User{name = " + name + ", password = " + password + ", id = " + id + ", phone = " + phone + "}";
        }
    }

//学生类

package com.itheima.test;
    
    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;
        }
    
        /**
         * 获取
         * @return id
         */
        public String getId() {
            return id;
        }
    
        /**
         * 设置
         * @param id
         */
        public void setId(String id) {
            this.id = id;
        }
    
        /**
         * 获取
         * @return name
         */
        public String getName() {
            return name;
        }
    
        /**
         * 设置
         * @param name
         */
        public void setName(String name) {
            this.name = name;
        }
    
        /**
         * 获取
         * @return age
         */
        public int getAge() {
            return age;
        }
    
        /**
         * 设置
         * @param age
         */
        public void setAge(int age) {
            this.age = age;
        }
    
        /**
         * 获取
         * @return address
         */
        public String getAddress() {
            return address;
        }
    
        /**
         * 设置
         * @param address
         */
        public void setAddress(String address) {
            this.address = address;
        }
    
        public String toString() {
            return "Student{id = " + id + ", name = " + name + ", age = " + age + ", address = " + address + "}";
        }
    }