JAVA---在idea上实现简易的学生管理系统
登录需求
代码实现
APP
package ITswj.test4_学生管理系统;
import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;
public class APP {
public static void main(String[] args) {
ArrayList<User>list=new ArrayList<User>();
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");
Scanner sc = new Scanner(System.in);
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]");
System.exit(0);
}
default-> System.out.println("[没有这个选项]");
}
}
}
//注册
public static void register(ArrayList<User> list)
{
//用户名 密码 身份证 手机号
//把用户对象添加到集合当中
//1.键盘录入用户名
Scanner sc=new Scanner(System.in);
String username;
String password;
String personID;
String phoneNumber;
while (true) {
System.out.println("[请输入用户名]");
username = sc.next();
//先验证格式是否正确，然后用户名要唯一
boolean flag1 = checkUsername(username);
if (!flag1) {
System.out.println("[用户名格式不满足，需要重新输入]");
continue;
}
boolean flag2= contains(list,username);
if(flag2){
System.out.println("[用户名]"+username+"[已经存在]");
}else{
System.out.println("[用户名]"+username+"[可用]");
break;
}
}
//2.键盘录入密码
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("[两次密码输入不一致，请重新输入]");
continue;
}else{
System.out.println("[两次密码输入一致，继续录入其他数据]");
break;
}
}
//3.键盘录入身份证密码
while (true)
{
System.out.println("[请输入身份证号码]");
personID=sc.next();
boolean flag=checkPersonID(personID);
if(flag){
System.out.println("[身份证号码满足要求]");
break;
}else{
System.out.println("[身份证号码格式错误]");
continue;
}
}
//4.键盘录入手机号
while (true){
System.out.println("请输入手机号码");
phoneNumber=sc.next();
boolean flag=checkPhoneNumber(phoneNumber);
if (flag){
System.out.println("手机号码格式正确");
break;
}else {
System.out.println("手机号码格式有误，请重新输入");
continue;
}
}
User u=new User(username,password,personID,phoneNumber);
list.add(u);
System.out.println("[注册成功]");
printList(list);
}
//登录
public static void login(ArrayList<User> list) {
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,请先注册再登录]");
return;
}
for (int i = 0; i < 3; i++) {
System.out.println("[请输入密码]");
String password = sc.next();
while (true) {
String rightCode = getCode();
System.out.println("[当前的正确的验证码为：" + 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("[验证码错误]");
continue;
}
}
User useInfo = new User(username, password, null, null);
boolean result = checkUserInfo(list, useInfo);
if (result) {
System.out.println("[登录成功,可以开始使用学生管理系统了]");
//启动学生管理系统
StudentManagement ss=new StudentManagement();
ss.startStudentSystem();
break;
} else {
System.out.println("[登录失败，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swj");
//锁定后 直接结束方法
return;
}else {
System.out.println("用户名或密码错误，还剩下"+(2-i)+"次机会");
}
}
}
}
//忘记密码
private static void forgetPassword(ArrayList<User> list) {
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("[当前用户]"+username+"[未注册，请先注册]");
return;
}
//录入身份证号码和手机号 才能修改密码
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();
//比较手机号与身份证是否相同
//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);
if(!(user.getPersonID().equalsIgnoreCase(personID)
&&user.getPhoneNumber().equals(phoneNumber)) ){
System.out.println("[身份证或手机号码输入有误，无法修改]");
return;
}
String password;
//验证成功，直接修改
while (true) {
System.out.println("[请输入新的密码]");
password = sc.next();
System.out.println("[请再次输入新的密码]");
String againPassword = sc.next();
if (password.equals(againPassword)) {
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;
}
}
//直接修改即可
user.setPassword(password);
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;
}
//验证码的生成
private static String getCode()
{
//验证码规则
//长度为5 由4个大小写字母和一位数字，数字可以出现在任意位置
ArrayList<Character>list=new ArrayList<>();
for (int i = 0; i < 26; i++) {
list.add((char)('a'+i));
list.add((char)('A'+i));
}
//构造验证码
StringBuilder sb=new StringBuilder();
Random r=new Random();
for (int i = 0; i < 4; i++) {
int index=r.nextInt(list.size());
char c=list.get(index);
sb.append(c);
}
//System.out.println(sb);
int number= r.nextInt(10);
sb.append(number);
char []arr=sb.toString().toCharArray();
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);
}
private static boolean checkUserInfo(ArrayList<User> list, User useInfo) {
for (int i = 0; i < list.size(); i++) {
User user=list.get(i);
if(user.getUsername().equals(useInfo.getUsername()) && user.getPassword().equals(useInfo.getPassword())){
return true;
}
}
return false;
}
private static boolean checkUsername(String username) {
//用户名长度必须要3-15位之间
int len=username.length();
if(len<3||len>15){
return false;
}
//继续校验 只能是字母加数字 但是不能是纯数字
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;
}
}
//不能是纯数字
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++;
break;
}
}
return count>0;
}
//打印列表
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());
}
}
//检查电话号码是否正确
private static boolean checkPhoneNumber(String phoneNumber) {
//长度为11位；
if(phoneNumber.length()!=11){
return false;
}
if(phoneNumber.startsWith("0")) {
return false;
}
for (int i = 0; i < phoneNumber.length(); i++) {
char c=phoneNumber.charAt(i);
if(!(c>='0'&&c<='9')){
return false;
}
}
return true;
}
//检查身份证号码
private static boolean checkPersonID(String personID) {
//长度必须位18位
if(personID.length()!=18){
return false;
}
//不能以0位开头
if(personID.startsWith("0")){
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 也可以是大小写的X
char endChar=personID.charAt(personID.length()-1);
if((endChar>='0'&&endChar<='9')||(endChar=='x')||(endChar=='X')){
return true;
}else {
return false;
}
}
//检查集合中是否存在当前元素
private static boolean contains(ArrayList<User> list, String username) {
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;
}
}
学生的类
package ITswj.test4_学生管理系统;
public class Student {
//姓名 年龄 家庭住址
private String id;
private String age;
private String name;
private String address;
public Student() {
}
public Student(String id, String age, String name, String address) {
this.id = id;
this.age = age;
this.name = name;
this.address = address;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}
学生管理系统
package ITswj.test4_学生管理系统;
import java.util.ArrayList;
import java.util.Scanner;
public class StudentManagement {
public static void startStudentSystem() {
ArrayList list=new ArrayList<Student>();
loop: while (true) {
System.out.println("----------------欢迎来到玮嘉学生管理系统-----------------");
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:退出学生管理系统");
System.out.println("请输入您的选择: ");
Scanner sc = new Scanner(System.in);
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("退出学生管理系统");
// break loop;
System.exit(0);
}
default -> System.out.println("没有这个选项");
}
}
}
//添加学生
public static void addStudent(ArrayList<Student> list){
Student stu=new Student();
Scanner sc=new Scanner(System.in);
String id=null;
while (true) {
System.out.println("请输入学生的id");
id=sc.next();
boolean flag = contains(list, id);
if (flag) {
System.out.println("id已经存在，请重新录入");
} else {
stu.setId(id);
break;
}
}
System.out.println("请输入学生的姓名");
String name=sc.next();
stu.setName(name);
System.out.println("请输入学生的年龄");
String age= sc.next();
stu.setAge(age);
System.out.println("请输入学生的地址");
String address=sc.next();
stu.setAddress(address);
list.add(stu);
System.out.println("学生信息添加成功");
//System.out.println("添加学生");
}
//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("该id不存在，删除失败");
}
//System.out.println("删除学生");
}
//更新学生信息
public static void updateStudent(ArrayList<Student> list){
//System.out.println("修改学生");
Scanner sc=new Scanner(System.in);
System.out.println("请输入要修改的学生的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");
return;
}
Student stu=list.get(index);
//输入信息修改元素
System.out.println("请输入要修改的学生姓名");
String newName=sc.next();
stu.setName(newName);
System.out.println("请输入要修改的学生年龄");
String newAge=sc.next();
stu.setAge(newAge);
System.out.println("请输入要修改的学生家庭住址");
String newAdress=sc.next();
stu.setAddress(newAdress);
System.out.println("学生信息修改成功");
}
//查询学生信息
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\t年龄\t\t家庭住址");
for(int i=0;i<list.size();i++)
{
Student stu=list.get(i);
System.out.println(stu.getId()+"\t\t"+stu.getName()+"\t\t" +
stu.getAge()+"\t\t"+stu.getAddress());
}
// System.out.println("查询学生");
}
//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;
return getIndex(list,id)>=0;
}
//通过 id 去获取索引
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;
}
}
用户类
package ITswj.test4_学生管理系统;
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;
}
}
posted on 2025-03-24 13:33 swj2529411658 阅读(90) 评论(0) 收藏 举报
浙公网安备 33010602011771号