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创建学生管理系统,先定义一个类,代码如下:
- package com.jiang.StudentSystem;
-
- public class Student {
- //id,name,age,address
- 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;
- }
- }
学生管理系统,代码如下:
- package com.jiang.StudentSystem;
-
- import java.util.ArrayList;
- import java.util.Scanner;
-
- public class StudentSystem {
- public static void startStudentSystem() {
- 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");
- Scanner sc = new Scanner(System.in);
- System.out.println("请输入您的选择:");
- String choose = sc.next();
-
- switch (choose) {
- case "1" -> addStudent(list);
- case "2" -> deleteStudent(list);
- case "3" -> updateStudent(list);
- case "4" -> queryStudent(list);
- case "5" -> {
- System.out.println("退出");
- break loop;
- }
- default -> System.out.println("没有这个选项");
- }
- }
- }
-
- //添加学生
- public static void addStudent(ArrayList<Student> list) {
- Student s = new Student();
- Scanner sc = new Scanner(System.in);
-
- while (true) {
- System.out.println("请输入学生的id:");
- String id = sc.next();
- boolean flag = contains(list, id);
- if (flag) {
- System.out.println("id已经存在,请重新录入");
- } else {
- s.setId(id);
- break;
- }
-
- }
-
- System.out.println("请输入学生的姓名:");
- String name = sc.next();
- s.setName(name);
-
- System.out.println("请输入学生的年龄:");
- int age = sc.nextInt();
- s.setAge(age);
- System.out.println("请输入学生的地址:");
- String address = sc.next();
- s.setAddress(address);
-
- //把学生添加到集合当中
- list.add(s);
-
-
- System.out.println("学生信息添加成功");
- }
-
- //删除学生
- public static void deleteStudent(ArrayList<Student> list) {
- Scanner sc = new Scanner(System.in);
- System.out.println("请输入要删除的id:");
- String id = sc.next();
- int index = getIndex(list, id);
- if (index >= 0) {
- list.remove(index);
- System.out.println("id为:" + id + "的学生删除成功");
- } else {
- System.out.println("id不存在,删除失败");
- }
-
- }
-
- //修改学生
- public static void updateStudent(ArrayList<Student> list) {
- Scanner sc = new Scanner(System.in);
- System.out.println("请输入要修改的学生id");
- String id = sc.next();
- int index = getIndex(list, id);
- if (index == -1) {
- System.out.println("要修改的id" + id + "不存在,请重新输入");
- return;
- }
- //获取要修改的对象
- Student stu = list.get(index);
-
- //输入其他信息并修改
- System.out.println("请输入要修改的学生姓名");
- String newName= sc.next();
- stu.setName(newName);
-
- System.out.println("请输入要修改学生的年龄");
- int newAge = sc.nextInt();
- stu.setAge(newAge);
-
- System.out.println("请输入要修改的学生的地址");
- String newAddress = sc.next();
- stu.setAddress(newAddress);
-
- System.out.println("学生信息修改成功");
-
- }
-
- //查询学生
- public static void queryStudent(ArrayList<Student> list) {
- if (list.size() == 0) {
- System.out.println("当前无学生信息,请添加后再查询");
- return;
- }
-
- System.out.println("id\t\t姓名\t年龄\t住址");
- for (int i = 0; i < list.size(); i++) {
- Student stu = list.get(i);
- System.out.println(stu.getId() + "\t" + stu.getName() + "\t" + stu.getAge() + "\t" + stu.getAddress());
- }
-
- }
-
- //判断id在集合中是否存在
- public static boolean contains(ArrayList<Student> list, String id) {
- for (int i = 0; i < list.size(); i++) {
- Student stu = list.get(i);
- String sid = stu.getId();
- if (sid.equals(id)) {
- return true;
- }
- }
- return false;
- }
-
- //通过id获取索引的方法
- public static int getIndex(ArrayList<Student> list, String id) {
- for (int i = 0; i < list.size(); i++) {
- Student stu = list.get(i);
- String sid = stu.getId();
- if (sid.equals(id)) {
- return i;
- }
- }
- return -1;
- }
-
- }
再创建一个学生管理系统登录界面,代码如下:
- package com.jiang.StudentSystem;
-
- 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) {
- phoneNumber = phoneNumber;
- }
- }
创建学生管理系统登录注册页面(此代码已调用学生管理系统),代码如下:
- package com.jiang.StudentSystem;
-
- import jdk.swing.interop.SwingInterOpUtils;
-
- import java.util.ArrayList;
- import java.util.List;
- import java.util.Random;
- import java.util.Scanner;
-
- public class App {
- public static void main(String[] args) {
- ArrayList<User> list = new ArrayList<>();
- Scanner sc = new Scanner(System.in);
-
- 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");
- String choose = sc.next();
- switch (choose) {
- case "1" -> login(list);
- case "2" -> register(list);
- case "3" -> forgetPassword(list);
- case "4" -> {
- System.out.println("谢谢使用,再见");
- //退出系统设置
- System.exit(0);
- }
- default -> System.out.println("没有这个选项");
-
- }
- }
-
-
- }
-
- private static void forgetPassword(ArrayList<User> list) {
- System.out.println("忘记密码");
- Scanner sc=new Scanner(System.in);
- System.out.println("请输入用户名");
- String userName = sc.next();
- boolean flag=contains(list,userName);
- if (!flag){
- System.out.println("用户名"+userName+"未注册,请先注册");
- return;
- }
- //若用户名存在,则继续下面操作
- System.out.println("请输入身份证号码");
- String personID = sc.next();
- System.out.println("请输入手机号码");
- String phoneNumber = sc.next();
-
-
- 需要把用户对象通过索引先获取出来。
- int index=findIndex(list,userName);
- User user = list.get(index);
- //比较用户对象中的手机号码和身份证号码是否相同
- if (!(user.getPersonID().equals(personID)&&user.getPhoneNumber().equals(phoneNumber))){
- System.out.println("身份证号码或者手机号码有误,不能修改密码");
- return;
- }
- //当代码执行到这里,表示所有的数据全部验证成功,直接修改即可
- String newPassWord;
- while (true) {
- System.out.println("请输入新的密码");
- newPassWord = sc.next();
- System.out.println("请再次输入密码");
- String againNewPassWord = sc.next();
- if (newPassWord.equals(againNewPassWord)){
- System.out.println("两次密码输入一致");
- break;
- }else{
- System.out.println("两次密码输入不一致,请重新输入");
- continue;
- }
- }
- //直接修改密码
- user.setPassWord(newPassWord);
- System.out.println("密码修改成功");
-
-
- }
-
- private static int findIndex(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 void register(ArrayList<User> list) {
- System.out.println("注册");
- //键盘录入用户名
- Scanner sc = new Scanner(System.in);
- String userName;
- while (true) {
- System.out.println("请输入用户名");
- userName = sc.next();
- //用户名要求:
- //1.用户名长度必须在3~15位之间
- //2.只能是字母加数字的组合,但是不能是纯数字
-
- boolean flag1 = checkUsername(userName);
- if (!flag1) {
- System.out.println("用户名格式不满足条件,需要重新输入");
- continue;
- }
- //3.唯一性
- boolean flag2 = contains(list, userName);
- if (flag2) {
- System.out.println("用户名" + userName + "已存在,请重新录入");
- } else {
- System.out.println("用户名" + userName + "可用");
- break;
- }
- }
- //密码键盘输入两次,两次一致才可以进行注册
- String passWord;
- while (true) {
- System.out.println("请输入要注册的密码");
- passWord = sc.next();
- System.out.println("请再次输入要注册的密码");
- String againPassWord = sc.next();
- if (!passWord.equals(againPassWord)) {
- System.out.println("两次输入的密码不一致,请重新输入");
- } else {
- System.out.println("两次密码一致,请继续录入其他信息");
- break;
- }
- }
- //键盘录入身份证号码
- String personID;
- while (true) {
- System.out.println("请输入身份证号码");
- personID = sc.next();
- boolean flag3 = checkPersonID(personID);
- if (flag3) {
- System.out.println("身份证号码满足要求");
- break;
- } else {
- System.out.println("身份证号码输入有误,请重新输入");
- continue;
- }
- }
- //键盘录入手机号码
- String phoneNumber;
- while (true) {
- System.out.println("请输入手机号码");
- phoneNumber = sc.next();
- boolean flag4 = checkPhoneNumber(phoneNumber);
- if (flag4) {
- System.out.println("手机号码格式正确");
- break;
- } else {
- System.out.println("手机号码格式错误,请重新输入");
- continue;
- }
- }
- //用户名,密码,身份证号码,手机号码放到用户对象中
- User u = new User(userName, passWord, personID, phoneNumber);
- //把用户对象添加到集合中
- list.add(u);
- System.out.println("注册成功");
- //遍历
- printList(list);
- }
-
- private static void printList(ArrayList<User> list) {
- for (int i = 0; i < list.size(); i++) {
- User user = list.get(i);
- System.out.println(user.getUsername() + "," + user.getPassWord() + "," + user.getPersonID() + "," + user.getPhoneNumber());
- }
- }
- //遍历集合
-
-
- private static boolean checkPhoneNumber(String phoneNumber) {
- //长度必须为11位
- if (phoneNumber.length() != 11) {
- return false;
- }
- //不能以0开头
- if (phoneNumber.startsWith("0")) {
- return false;
- }
- //必须为数字
- for (int i = 0; i < phoneNumber.length(); i++) {
- char c = phoneNumber.charAt(i);
- if (c < '0' && c > '9') {
- return false;
- }
- }
- return true;
- }
-
- private static boolean checkPersonID(String personID) {
-
- //长度为18
- if (personID.length() != 18) {
- return false;
- }
- //不能以0开头
- if (personID.startsWith("0")) {
- //如果以0开头,直接false
- return false;
- }
- //前17位必须是数字
- for (int i = 0; i < personID.length() - 1; i++) {
- char c = personID.charAt(i);
- if (!(c >= '0' && c <= '9')) {
- return false;
- }
- }
- //最后一位可以是数字,也可以是大写X或小写x
- char c = personID.charAt(personID.length() - 1);
- if ((c >= '0' && c <= '9') || (c == 'X' || c == 'x')) {
- return true;
- } else {
- return false;
- }
- }
-
- private static boolean contains(ArrayList<User> list, String userName) {
- //唯一性
- for (int i = 0; i < list.size(); i++) {
- User user = list.get(i);
- String rightUsername = user.getUsername();
- if (rightUsername.equals(userName)) {
- return true;
- }
- }
- return false;
- }
-
- private static boolean checkUsername(String userName) {
- //用户名长度必须在3~15位之间
- int len = userName.length();
- if ((len < 3) || (len > 15)) {
- return false;
- }
- //当代码执行到这里,表示用户名的长度是符合要求的。
- //继续校验:只能是字母加数字的组合
- //循环得到username里面的每一个字符,如果有一个字符不是字母或者数字,那么就返回false
- for (int i = 0; i < userName.length(); i++) {
- char c = userName.charAt(i);
- if (!((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9'))) {
- return false;
- }
- }
- //当代码执行到这里,表示什么?
- //用户名满足两个要求:1长度满足 2内容也满足(字母+数字)
- //但是不能是纯数字
- //统计在用户名中,有多少字母就可以了。
- int count = 0;
- for (int i = 0; i < userName.length(); i++) {
- char c = userName.charAt(i);
- if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')) {
- count++;
- }
- }
- return count > 0;
-
-
- }
-
- private static void login(ArrayList<User> list) {
- System.out.println("登录");
- //键盘录入用户名
- Scanner sc = new Scanner(System.in);
- for (int i = 0; i < 3; i++) {
- System.out.println("请输入用户名");
- String userName = sc.next();
- //判断用户名是否注册
- boolean flag = contains(list, userName);
- if (!flag) {
- System.out.println("用户名" + userName + "未注册,请先注册");
- continue;
- }
- System.out.println("请输入密码");
- String password = sc.next();
-
- while (true) {
- String rightCode = getCode();
- System.out.println("正确的验证码为:" + rightCode);
- System.out.println("请输入验证码");
- String code = sc.next();
- if (code.equalsIgnoreCase(rightCode)) {
- System.out.println("验证码正确");
- break;
- } else {
- System.out.println("验证码有误,请重新输入");
- continue;
- }
- }
- //验证用户名和密码是否正确
- //集合中是否包含用户名和密码
- //定义一个方法验证用户名和密码是否正确
- //封装思想的应用:
- //我们可以把一些零散的数据,封装成一个对象
- //以后传递参数的时候,只要传递一个整体就可以了,不需要管这些零散的数据
- User userInfo = new User(userName, password, null, null);
- boolean result = checkUserInfo(list, userInfo);
- if (result) {
- System.out.println("登陆成功,可以开始使用学生管理系统了");
- //创建对象调用方法,启动学生管理系统
- StudentSystem ss=new StudentSystem();
- ss.startStudentSystem();
- break;
- } else {
- System.out.println("登陆失败,用户名或密码错误");
- if (i == 2) {
- System.out.println("当前账号" + userName + "被锁定,请联系安徽新华学院客服:05553-459867");
- //当前账号被锁定,直接结束
- return;
- } else {
- System.out.println("用户名或密码错误,还剩下" + (2 - i) + "次机会");
- }
- }
- }
-
- }
-
- private static boolean checkUserInfo(ArrayList<User> list, User userInfo) {
- //遍历集合,判断用户是否存在,如果存在登录成功,如果不存在登录失败
- for (int i = 0; i < list.size(); i++) {
- User user = list.get(i);
- if (user.getUsername().equals(userInfo.getUsername()) && user.getPassWord().equals(userInfo.getPassWord())) {
- return true;
- }
- }
- return false;
- }
-
-
- private static String getCode() {
- //1.创建一个集合,添加所有大小写字母
- ArrayList<Character> list = new ArrayList<>();
- for (int i = 0; i < 26; i++) {
- list.add((char) ('a' + i));
- list.add((char) ('A' + i));
- }
-
- StringBuilder sb = new StringBuilder();
- //随机获取四个字母
- Random r = new Random();
- for (int i = 0; i < 4; i++) {
- //获取随机索引
- int index = r.nextInt(list.size());
- //利用随机索引获取字符
- char c = list.get(index);
- //把随机字符添加到sb中
- sb.append(c);
- }
- //把一个随机数添加到末尾
- int number = r.nextInt(10);
- sb.append(number);
-
- //4.如果我们要修改字符串中的内容
- //先把字符串变成字符数组,在数组中修改,然后再创建一个新的字符串
- char[] arr = sb.toString().toCharArray();
- //用最后一个索引跟随即索引交换
- int randomIndex = r.nextInt(arr.length);
- char temp = arr[randomIndex];
- arr[randomIndex] = arr[arr.length - 1];
- arr[arr.length - 1] = temp;
- return new String(arr);
- }
- }
代码最终运行结果如下;
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