Java项目练习——学生管理系统

1. 整体结构

代码实现了基本的学生管理系统功能，包括登录、注册、忘记密码、添加、删除、修改和查询学生信息。
使用了ArrayList来存储用户和学生信息。
使用了Scanner类来处理用户输入。

2. 主要功能模块

登录 (logIn)：验证用户名和密码，支持验证码校验。
注册 (register)：验证用户名、密码、身份证号和手机号。
忘记密码 (forgetPassword)：通过用户名、身份证号和手机号验证后修改密码。
管理学生信息 (Manage)：提供添加、删除、修改和查询学生信息的功能。

如果有问题，希望大家指正

Student_JavaBean

package student_Management_System;public class Student_JavaBean {private String id;private String name;private int age;private String address;public Student_JavaBean() {}public Student_JavaBean(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;}
}

User_JavaBean

package student_Management_System;
public class User_JavaBean {//属性：用户名、密码、身份证号码、手机号码private String username;private String password;private String idCard;private String phone;public User_JavaBean() {}public User_JavaBean(String username, String password, String idCard, String phone) {this.username = username;this.password = password;this.idCard = idCard;this.phone = phone;}/*** 获取* @return username*/public String getUsername() {return username;}/*** 设置* @param username*/public void setUsername(String username) {this.username = username;}/*** 获取* @return password*/public String getPassword() {return password;}/*** 设置* @param password*/public void setPassword(String password) {this.password = password;}/*** 获取* @return idCard*/public String getIdCard() {return idCard;}/*** 设置* @param idCard*/public void setIdCard(String idCard) {this.idCard = idCard;}/*** 获取* @return phone*/public String getPhone() {return phone;}/*** 设置* @param phone*/public void setPhone(String phone) {this.phone = phone;}
}

主函数

package student_Management_System;import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;public class Student {public static void main(String[] args) {ArrayList<Student_JavaBean>list=new ArrayList<>();ArrayList<User_JavaBean> user=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");int choose_up = sc.nextInt();switch (choose_up) {case 1: {logIn(user,list);break;}case 2:register(user);searchUsername(user);break;case 3://       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//      2，键盘录入身份证号码和手机号码//	    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。forgetPassword(user);break;case 4:return;default:System.out.println("输入错误");break;}}}public static void logIn(ArrayList<User_JavaBean>user,ArrayList<Student_JavaBean>list) {//用户名如果未注册，直接结束方法，并提示：用户名未注册，请先注册//判断验证码是否正确，如不正确，重新输入//再判断用户名和密码是否正确，有3次机会Scanner sc = new Scanner(System.in);while (true) {System.out.println("请输入用户名");String username = sc.next();boolean flag = checkHava(user,username);if (flag) {int count = 2;while (count >= 0) {System.out.println("请输入密码");String password = sc.next();int flag2 = (index(user, username));if (flag2 >= 0) {if (user.get(index(user, username)).getPassword().equals(password)) {break;}System.out.println("密码错误还有" + count + "次机会");if (count == 0) {return;}count--;}}break;}else {System.out.println("登录失败,用户名不存在，请按下其它数字键重新输入，按下0退出程序");int temp = sc.nextInt();if (temp == 0) {return;}}}while (true) {System.out.println("请输入验证码");String newVerificationCode = verificationCode();System.out.println(newVerificationCode);String verificationCode = sc.next();if (verificationCode.equals(newVerificationCode)) {break;}}System.out.println("登录成功");Manage(list);}public static void Manage(ArrayList<Student_JavaBean>list){Scanner sc=new Scanner(System.in);while (true) {int choose = menu(sc);switch (choose) {case 1:add(list);break;case 2:delete(list);break;case 3:upData(list);break;case 4:search(list);break;case 5:System.out.println("退出");return;default:System.out.println("输入错误重新输入");break;}}}public static void forgetPassword(ArrayList<User_JavaBean> user) {Scanner sc = new Scanner(System.in);while (true) {System.out.println("请输入用户名");String username = sc.next();int index = index(user, username);if (index == -1) {System.out.println("用户名不存在，请按下其它数字键重新输入，按下0退出程序");int temp = sc.nextInt();if (temp == 0) {return;}continue;}while (true) {System.out.println("输入用户的身份证号");String IdCard = sc.next();if (user.get(index).getIdCard().equals(IdCard)) {break;} else {System.out.println("身份证号不匹配，请按下其它数字键重新输入，按下0退出程序");int temp = sc.nextInt();if (temp == 0) {return;}}}while (true) {System.out.println("请输入用户的手机号");String phone = sc.next();if (user.get(index).getPhone().equals(phone)) {break;} else {System.out.println("手机号不匹配，请按下其它数字键重新输入，按下0退出程序");int temp = sc.nextInt();if (temp == 0) {return;}}}System.out.println("请输入新密码");String newPassword = sc.next();user.get(index).setPassword(newPassword);System.out.println("修改成功");return;}}public static int index(ArrayList<User_JavaBean>user,String temp){for (int i = 0; i < user.size(); i++) {if(user.get(i).getUsername().equals(temp)){return i;}}return -1;}public static boolean checkHava(ArrayList<User_JavaBean>user,String username){for (int i = 0; i < user.size(); i++) {if(user.get(i).getUsername().equals(username)){return true;}}System.out.println("用户未注册，请先注册");return false;}public static String verificationCode(){Random random=new Random();char[] zLen =new char[5];for (int i = 0; i < zLen.length-1; i++) {int flag=random.nextInt(2);if(flag==0) {zLen[i] = (char) (random.nextInt(25) + 65);}else{zLen[i] = (char) (random.nextInt(26) + 97);}}zLen[zLen.length-1]=(char)(random.nextInt(10)+'0');for (int i = 0; i < zLen.length; i++) {char temp=zLen[i];int j=random.nextInt(zLen.length);zLen[i]=zLen[j];zLen[j]=temp;}return new String(zLen);}public static void searchUsername(ArrayList<User_JavaBean>user){System.out.println("用户名     身份证号\t\t\t 密码\t  手机\t");for (int i = 0; i < user.size(); i++) {System.out.println(user.get(i).getUsername()+" "+user.get(i).getIdCard()+" "+user.get(i).getPassword()+"    "+user.get(i).getPhone());}}public static void register(ArrayList<User_JavaBean>user){//用户名长度必须在3~15位之间//只能是字母加数字的组合，但是不能是纯数字//	2，密码键盘输入两次，两次一致才可以进行注册。//	3，身份证号码需要验证。//		验证要求：//			长度为18位//			不能以0为开头//			前17位，必须都是数字//			最为一位可以是数字，也可以是大写X或小写x//	4，手机号验证。//		验证要求：//			长度为11位//			不能以0为开头//			必须都是数字Scanner sc=new Scanner(System.in);User_JavaBean uj=new User_JavaBean();while(true) {System.out.println("请输入用户名(3-15位之间，只能字母加数字，但不能是纯数字)");String username = sc.next();boolean flag = checkUsername(username);if (flag) {uj.setUsername(username);break;} else {System.out.println("注册失败,用户名输入错误，请按下其它数字键重新输入，按下0退出程序");if(sc.nextInt()==0){return;}}}while(true){System.out.println("输入密码");String password=sc.next();if(checkPassword(password)){uj.setPassword(password);break;}else{System.out.println("两次密码输入不相同，请按下其它数字键重新输入，按下0退出程序");if(sc.nextInt()==0){return;}}}while(true){System.out.println("输入身份证号");String inCard=sc.next();if(checkInCard(inCard)){uj.setIdCard(inCard);break;}else{System.out.println("身份证号输入格式错误，请按下其它数字键重新输入，按下0退出程序");if(sc.nextInt()==0){return;}}}while(true){System.out.println("输入手机号");String phone=sc.next();if(checkPhone(phone)){uj.setPhone(phone);break;}else{System.out.println("手机号输入格式错误，请按下其它数字键重新输入，按下0退出程序");if(sc.nextInt()==0){return;}}}user.add(uj);System.out.println("注册成功!");}public static boolean checkPassword(String password){Scanner sc=new Scanner(System.in);System.out.println("请再次输入密码");String newPassword=sc.next();if(password.equals(newPassword)){return true;}System.out.println("两次输入不相同");return false;}public static boolean checkPhone(String Phone){//4，手机号验证。//		验证要求：//			长度为11位//			不能以0为开头//			必须都是数字char first=Phone.charAt(0);char []temp=new char[Phone.length()];int count=0;if(Phone.length()==11){if(first!='0'){for (int i = 0; i < Phone.length(); i++) {temp[i]=Phone.charAt(i);if(temp[i]>='0'&&temp[i]<='9'){count++;}}return count == 11;}}return false;}public static boolean checkInCard(String inCard){//		验证要求：//			长度为18位//			不能以0为开头//			前17位，必须都是数字//			最为一位可以是数字，也可以是大写X或小写xif(inCard.length()==18){char first=inCard.charAt(0);char []temp=new char[inCard.length()];char end=inCard.charAt(17);if(first!='0'){for (int i = 0; i < inCard.length()-1; i++) {temp[i]=inCard.charAt(i);if(temp[i]>='0'&&temp[i]<='9'){if(end>='0'&&end<='9'||end=='x'||end=='X'){return true;}}}}}System.out.println("身份证输入有误");return false;}public static boolean checkUsername(String pwd){Scanner sc=new Scanner(System.in);int len=pwd.length();if(len<3||len>15){return false;}int count=0;for (int i = 0; i < pwd.length(); i++) {char c=pwd.charAt(i);if(!(c >= 'A' && c <= 'Z' || c >= 'a' && c <= 'z' || c >= '0' && c <= '9'))//判断是否是在允许的范围内{System.out.println("范围不正确");return false;}}for (int i = 0; i < pwd.length(); i++) {char c=pwd.charAt(i);//判断是否是纯数字if(c>='0'&&c<='9'){count++;}}if(count==pwd.length()){System.out.println("不能是纯数字");return false;}return true;}public static boolean checkId(ArrayList<Student_JavaBean>list,String id){for (int i = 0; i < list.size(); i++) {if(list.get(i).getId().equals(id)){return true;}}return false;}public static void delete(ArrayList<Student_JavaBean>list){Scanner sc=new Scanner(System.in);System.out.println("请输入需要删除的id");String id=sc.next();boolean flag=checkId(list,id);if(!flag){System.out.println("该id不存在");return;}for (int i = 0; i < list.size(); i++) {if(list.get(i).getId().equals(id)){list.remove(i);break;}}System.out.println("删除成功");}public static void upData(ArrayList<Student_JavaBean>list) {Scanner sc = new Scanner(System.in);Student_JavaBean sj=new Student_JavaBean();System.out.println("请输入需要修改的id");String id = sc.next();boolean flag=checkId(list,id);if(!flag){System.out.println("不存在该id");return;}System.out.println("请输入修改类型:1.id 2.姓名 3.年龄 4.地址");int type=sc.nextInt();switch (type) {case 1: {for (int i = 0; i < list.size(); i++) {if (list.get(i).getId().equals(id)) {System.out.println("输入新的id");String newId = sc.next();sj.setId(newId);list.get(i).setId(newId);System.out.println("修改成功");break;}}break;}case 2: {for (int i = 0; i < list.size(); i++) {if (list.get(i).getId().equals(id)) {System.out.println("输入新的姓名");String newName = sc.next();sj.setName(newName);list.get(i).setName(newName);System.out.println("修改成功");break;}}break;}case 3: {for (int i = 0; i < list.size(); i++) {if (list.get(i).getId().equals(id)) {System.out.println("输入新的年龄");int newAge = sc.nextInt();sj.setAge(newAge);list.get(i).setAge(newAge);System.out.println("修改成功");break;}}break;}case 4:{for (int i = 0; i < list.size(); i++) {if (list.get(i).getId().equals(id)) {System.out.println("输入新的地址");String newAddress = sc.next();sj.setAddress(newAddress);list.get(i).setAddress(newAddress);System.out.println("修改成功");break;}}break;}default:System.out.println("输入有误");break;}}public static void search(ArrayList<Student_JavaBean> list){if(list.size()==0){System.out.println("当前无学生信息，请添加后再查询");}else{System.out.println("id\t\t姓名\t年龄\t地址\t");for (int i = 0; i < list.size(); i++) {Student_JavaBean su=list.get(i);System.out.println(su.getId()+"\t"+su.getName()+"\t"+su.getAge()+"\t"+su.getAddress()+"\t");}}}public static void add(ArrayList<Student_JavaBean>list){Student_JavaBean s=new Student_JavaBean();Scanner sc=new Scanner(System.in);System.out.println("输入id：");String id=sc.next();s.setId(id);boolean flag=checkId(list,id);if(flag){System.out.println("该id已存在");return;}System.out.println("输入姓名：");String name=sc.next();s.setName(name);System.out.println("输入年龄：");int age=sc.nextInt();s.setAge(age);System.out.println("输入地址：");String address=sc.next();s.setAddress(address);list.add(s);System.out.println("添加成功");}public static int menu(Scanner sc){int choose;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.print("\"请输入您的选择:\"");choose=sc.nextInt();return choose;}}