黑马学生管理系统

学生管理系统

Javabean类

java 复制代码

package heima.test;

public class Studnt {
    //属性：id、姓名、年龄、家庭住址
    private  int id;
    private  String name;
    private  int age;
    private  String address;

    public Studnt() {
    }

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

    public int getId() {
        return id;
    }

    public void setId(int 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;
    }
}

Javatest类

java 复制代码

package heima.test;

import com.sun.security.jgss.GSSUtil;
import java.sql.SQLOutput;
import java.util.ArrayList;
import java.util.Scanner;
public class Studnttest {
    public static void startmain() {
        ArrayList<Studnt> studnts = new ArrayList<>();
        Scanner sc = new Scanner(System.in);
      loop:  while (true) {
            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:");
            int choose = sc.nextInt();
            switch (choose) {
                case 1 ->  addstudent(studnts);
                case 2 -> deletstudent(studnts);
                case 3 -> changestudent(studnts);
                case 4 -> inquirestudent(studnts);
                case 5 -> { System.out.println("5：退出");
                          break loop;
                }
                default -> System.out.println("没有此选项");
            }
        }
        printlist(studnts);

    }
    //添加学生
    public static void addstudent(ArrayList<Studnt> studnts){
        System.out.println("1：添加学生");
        Scanner sc = new Scanner(System.in);
        Studnt s = new Studnt();
        while (true) {
            System.out.println("请输入需要添加的学生id");
            int  id = sc.nextInt();
            boolean flag = judge(studnts,id);
            if(flag){
                System.out.println("学生信息已存在，请重新录入");
            }else {
                s.setId(id);
                break;
            }
        }
        System.out.println("请输入需要添加的学生名字");
        s.setName(sc.next());

        System.out.println("请输入需要添加的学生年龄");
        s.setAge(sc.nextInt());
        System.out.println("请输入需要添加的学生地址");
        s.setAddress(sc.next());
        studnts.add(s);
        System.out.println("学生信息添加成功");
    }
    //删除学生
    public static void deletstudent(ArrayList<Studnt> studnts){
        Scanner sc = new Scanner(System.in);
        System.out.println("2：删除学生");
        System.out.println("请输入想要删除学上的id");
        int temp = sc.nextInt();
       int index= getindex(studnts,temp);
        if(index>=0){
            studnts.remove(index);
        }else {
            System.out.println("id不存在，删除失败");
        }


    }
    //修改
    public static void changestudent(ArrayList<Studnt> studnts){
        Scanner sc = new Scanner(System.in);
        System.out.println("3：修改学生");
        System.out.println("请输入要修改的学生id");
        int temp = sc.nextInt();
        int getindex = getindex(studnts,temp);
        if ((getindex<0)){
            System.out.println("学生信息不存在，删除失败");
        }else{
            System.out.println("请输入新的学生名字");
            Studnt s = studnts.get(getindex);
            String newname = sc.next();
           s.setName(newname);
            System.out.println("请输入新的学生年龄");
            int newage = sc.nextInt();
            s.setAge(newage);
            System.out.println("请输入新的学生地址");
            String newaddress = sc.next();
            s.setAddress(newaddress);
            System.out.println("学生信息修改成功");
        }
    }
    public static void inquirestudent(ArrayList<Studnt> studnts){
        System.out.println("4：查询学生");
        if (studnts.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");
            for (int i = 0; i < studnts.size(); i++) {
                Studnt s = studnts.get(i);
                System.out.println(s.getName()+" "+s.getId()+" "+s.getAge()+" "+s.getAddress());
            }
        }
    }
    //遍历数组
    public static void printlist(ArrayList<Studnt> studnts){
        for (int i = 0; i < studnts.size(); i++) {
            Studnt s = studnts.get(i);
            System.out.println(s.getName()+" "+s.getId()+" "+s.getAge()+" "+s.getAddress());
        }
    }
    //判断唯一性
    public  static  boolean judge(ArrayList<Studnt> studnts,int id){
        for (int i = 0; i < studnts.size(); i++) {
            if (studnts.get(i).getId() == id){
                return true;
            }
        }
        return false;
    }
    //查询id返回下标
    public static int getindex(ArrayList<Studnt> studnts,int id){
        for (int i = 0; i < studnts.size(); i++) {
            if (studnts.get(i).getId() == id){
                return i;
            }
        }
        return -1;
    }
}

学生管理系统升级版

Javabean类

Java 复制代码

package heima.test;

public class User {
    //属性：用户名、密码、身份证号码、手机号码
    private String name;
    private String password;
    private String personnumber;
    private String phonenumber;

    public User() {
    }

    public User(String name, String password, String personnumber, String phonenumber) {

        this.name = name;
        this.password = password;
        this.personnumber = personnumber;
        this.phonenumber = phonenumber;
    }

    public String getName() {
        return name;
    }

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

    public String getPassword() {
        return password;
    }

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

    public String getPersonnumber() {
        return personnumber;
    }

    public void setPersonnumber(String personnumber) {
        this.personnumber = personnumber;
    }

    public String getPhonenumber() {
        return phonenumber;
    }

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

Javatest类

java 复制代码

package heima.test;

import java.sql.SQLOutput;
import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;
public class Usertest {
    static void main() {
        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");
            int choice = sc.nextInt();
            switch (choice) {
                case 1-> login(list);
                case 2-> register(list);
                case 3-> forget(list);
                case 4-> {
                    System.out.println("推出");
                    return;
                }
                default -> System.out.println("没有此选项");
            }
        }
    }
    public static void login(ArrayList<User> list) {
        Scanner sc = new Scanner(System.in);
        System.out.println("登录");
        for (int i = 0; i < 3; i++) {
            System.out.println("请输入用户名");
            String name = sc.next();
            System.out.println("请输入密码");
            String password = sc.next();
            boolean flag = unique(list,name);
            if (!flag) {
                System.out.println("用户不存在，请先注册");
                return;
            }
            while (true) {
                System.out.println("请输入验证码");
                String usercode = sc.next();
                code();
                String code = sc.next();
                System.out.println(code);
                if (!usercode.equalsIgnoreCase(code)) {
                    System.out.println("验证码错误，请重新输入");
                }else{
                    break;
                }
            }
            User user = new User(name,password,null,null);
            Boolean flag1 = cheaklogin(list,user);
            if (!flag1) {
                System.out.println("用户名或密码错误，请重新输入");
            }else if (i==2){
                System.out.println("当前用户已被锁定，请联系客服");
            }else{
                System.out.println("登陆成功");
                Studnttest.startmain();
                break;
            }

        }
    }
    public static void register(ArrayList<User> list) {
        String name;
        String password;
        String personnumber;
        String phonenumber;
        System.out.println("注册");
        Scanner sc = new Scanner(System.in);
        while (true) {
            System.out.println("请输入需要注册的用户名");
             name = sc.next();
            // 用户名唯一
            boolean flag = unique(list, name);
            if (flag) {
                System.out.println("用户已存在，请重新你输入");
                continue;
            }
            // 用户名长度必须在3~15位之间
            if (!(name.length()>3&&name.length()<15)) {
                System.out.println("用户名长度必须在3~15位之间");
                continue;
            }
            // //只能是字母加数字的组合，但是不能是纯数字
            Boolean flag1 = cheakname(name);
            if (!flag1) {
                System.out.println("只能是字母加数字的组合，但是不能是纯数字");
            }
            break;
        }
        while (true) {
            //2，密码键盘输入两次，两次一致才可以进行注册。
            System.out.println("请输入密码");
            password = sc.next();
            System.out.println("请再次输入密码");
            String password01 = sc.next();
            if (password.equals(password01)) {
                break;
            }
            System.out.println("两次输入的密码不一致，请重新输入");
        }
        while (true) {
            System.out.println("请输入身份证号");
            personnumber = sc.next();
            boolean flag = cheakpersonnumber(personnumber);
            if (!flag) {
                System.out.println("身份证格式不对，请重新输入");
            }else {
                System.out.println("身份证格式正确");
                break;
            }
        }
        while (true) {
            System.out.println("请输入手机号");
            phonenumber = sc.next();
            boolean flag = cheakphonenumber(phonenumber);
            if (!flag) {
                System.out.println("手机号格式不对");
            }else{
                System.out.println("手机号可用");
                break;
            }
        }
        User newUser = new User(name,password,personnumber,phonenumber);
        list.add(newUser);
        printlist(list);
    }
    public static void forget(ArrayList<User> list) {
        Scanner sc = new Scanner(System.in);
        System.out.println("忘记密码");
        //，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
        System.out.println("请输入用户名");
        String name = sc.next();
        boolean flag = unique(list, name);
        if (!flag) {
            System.out.println("用户名不存在，未注册");
            return;
        }
        System.out.println("请输入身份证号");
        String peronnumber = sc.next();
        System.out.println("请输入手机号");
        String phonenumber = sc.next();
        int i = getindex(list,name);
        User newUser = list.get(i);
        if (!(newUser.getPersonnumber().equals(peronnumber) && newUser.getPhonenumber().equals(phonenumber))) {
            System.out.println("账号信息不匹配，修改失败");
        }else{
            while (true) {
                System.out.println("请输入新密码");
                String password = sc.next();
                System.out.println("请再次输入新密码");
                String newpassword = sc.next();
                if (!(password.equals(newpassword))) {
                    System.out.println("两次密码不一样，请重新输入");
                }else{
                    newUser.setPassword(newpassword);
                    System.out.println("修改成功");
                    break;
                }
            }
        }

    }
    public static boolean unique(ArrayList<User> list,String number) {
        //检查唯一性
        for (int i = 0; i < list.size(); i++) {
            User u = list.get(i);
            if (u.getName().equals(number)) {
                return true ;
            }
        }
        return false;
    }
    public static boolean cheakname(String name){
        char[] ch = name.toCharArray();
        int count = 0;
        for (int i = 0; i < ch.length; i++) {
            char c = ch[i];
            if(!((c>='A' && c<='Z')||(c>='a' && c<='z')||(c>='0' && c<='9'))) {
                return false;
            }
            else if ((c>='A' && c<='Z')||(c>='a' && c<='z')) {
                    count++;
                    break;
                }else {
                return false;
            }
        }
        return true;
    }
    public static boolean cheakpersonnumber(String personnumber){
        // 3，身份证号码需要验证。
        char[] ch = personnumber.toCharArray();
        //长度为18位
        if (ch.length!=18){
            return false;
        }
        //不能以0为开头
        boolean flag = personnumber.startsWith("0");
        if (flag) {
            return false;
        }
        //前17位，必须都是数字
        for (int i = 0; i < ch.length-1; i++) {
           char c = ch[i];
           if(!(c>='0' && c<='9')){
               return false;
           }
        }
        // 最为一位可以是数字，也可以是大写X或小写x
        char c1 = ch[ch.length-1];
        if (!((c1>='0' && c1<='9')||(c1=='X')||(c1=='x'))){
            return false;
        }
        return true;
    }
    public static boolean cheakphonenumber(String phonenumber){
        //长度为11位
       if(phonenumber.length()!=11){
           return false;
        }
       //不能以0为开头
       boolean flag = phonenumber.startsWith("0");
       if (flag) {
           return false;
       }
       //必须都是数字
        char[] ch = phonenumber.toCharArray();
        for (int i = 0; i < ch.length; i++) {
            char c = ch[i];
            if(!(c>='0' && c<='9')){
                return false;
            }
        }
        return true;
    }
    public static void code(){
        ArrayList<Character> list = new ArrayList<>();
        for (int i = 0; i < 26; i++) {
            list.add((char)(i+'a'));
            list.add((char)(i+'A'));
        }
        Random random = new Random();
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < 4; i++) {
            int R = random.nextInt(list.size());
            char c = list.get(R);
            sb.append(c);
        }
        int R = random.nextInt(10);
        sb.append(R);
        char [] ch =sb.toString().toCharArray();
        for (int i = 0; i < ch.length; i++) {
            int R1 = random.nextInt(sb.length());
            char temp = ch[R1];
            ch[R1] = ch[ch.length-1];
            ch[ch.length-1] = temp;
        }
        System.out.println(new String(ch));
    }
    public  static void printlist(ArrayList<User> list){
        for (int i = 0; i < list.size(); i++) {
            System.out.println(list.get(i).getName()+","+list.get(i).getPersonnumber()+","+list.get(i).getPhonenumber());
        }
    }
    public static boolean cheaklogin(ArrayList<User> list,User newUser) {
        for (int i = 0; i < list.size(); i++) {
            User u = list.get(i);
            if (u.getName().equals(newUser.getName())) {
                if (u.getPassword().equals(newUser.getPassword())) {
                    return true;
                }
            }
        }
        return false;
    }
    public static  int getindex(ArrayList<User> list,String name){
        for (int i = 0; i < list.size(); i++) {
            User u = list.get(i);
            if (u.getName().equals(name)) {
                return i;
            }
        }
        return -1;
    }
}