用户管理高级版
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src/chapter4/demo49/Main.java
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90
src/chapter4/demo49/Main.java
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package chapter4.demo49;
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import java.util.Scanner;
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public class Main {
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// 处理用户的输入
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private static Scanner scanner = new Scanner(System.in);
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// 用户管理器
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private static UserManager userManager = UserManager.getInstance();
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// 当前登录用户
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private static AbstractUser currentUser = null;
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public static void main(String[] args) {
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while (true) {
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printMainMenu();
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try {
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int choice = scanner.nextInt();
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switch (choice) {
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case 1:
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login();
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break;
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case 2:
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register();
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break;
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case 3:
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if (currentUser instanceof AdminUser) {
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userManager.showAllUsers();
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} else {
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System.out.println("权限不足！");
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}
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break;
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case 4:
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if (currentUser instanceof AdminUser) {
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System.out.print("请输入要删除的用户名：");
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String username = scanner.next();
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userManager.removeUser(username);
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System.out.println("删除用户成功！");
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} else {
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System.out.println("权限不足！");
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}
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break;
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case 0:
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System.out.println("谢谢使用，再见！");
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System.exit(0);
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default:
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System.out.println("无效的选择！");
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}
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} catch (Exception e) {
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System.out.println("发生错误：" + e.getMessage());
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scanner.nextLine(); // 清除输入缓冲
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}
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}
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}
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private static void printMainMenu() {
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System.out.println("\n=====用户管理系统=====");
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System.out.println("1. 用户登录");
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System.out.println("2. 用户注册");
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System.out.println("3. 查看用户列表（需管理员权限）");
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System.out.println("4. 删除用户（需管理员权限）");
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System.out.println("0. 退出系统");
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System.out.println("请选择功能：");
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}
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private static void login() throws UserException {
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System.out.print("请输入用户名：");
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String username = scanner.next();
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System.out.print("请输入密码：");
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String password = scanner.next();
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currentUser = userManager.login(username, password);
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System.out.println("登录成功！欢迎 " + currentUser.getUsername());
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if (currentUser instanceof AdminUser) {
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System.out.println("您以管理员身份登录");
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}
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}
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private static void register() throws UserException {
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System.out.print("请输入用户名：");
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String username = scanner.next();
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System.out.print("请输入密码：");
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String password = scanner.next();
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NormalUser newUser = new NormalUser(username, password);
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userManager.addUser(newUser);
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System.out.println("注册成功！");
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}
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}
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73
src/chapter4/demo49/User.java
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src/chapter4/demo49/User.java
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package chapter4.demo49;
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// 自定义异常类
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class UserException extends Exception {
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public UserException(String message) {
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super(message);
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}
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}
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// 用户操作接口
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interface UserOperation {
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void changePassword(String newPassword) throws UserException;
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void showInfo();
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}
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// 抽象用户类
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abstract class AbstractUser implements UserOperation {
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protected String username; // 用户名
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protected String password; // 密码
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protected String userType; // 用户类型
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// 构造方法
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public AbstractUser(String username, String password) {
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this.username = username;
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this.password = password;
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}
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public String getUsername() {
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return username;
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}
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// 检查密码是否正确
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public boolean checkPassword(String password) {
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return this.password.equals(password);
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}
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@Override
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public void showInfo() {
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System.out.println("用户名：" + username + "，用户类型：" + userType);
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}
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}
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// 普通用户类
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class NormalUser extends AbstractUser {
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public NormalUser(String username, String password) {
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super(username, password);
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this.userType = "普通用户";
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}
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@Override
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public void changePassword(String newPassword) throws UserException {
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if (newPassword.length() < 6) {
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throw new UserException("密码长度不能小于6位");
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}
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this.password = newPassword;
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}
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}
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// 管理员类
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class AdminUser extends AbstractUser {
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public AdminUser(String username, String password) {
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super(username, password);
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this.userType = "管理员";
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}
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@Override
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public void changePassword(String newPassword) throws UserException {
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if (newPassword.length() < 8) {
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throw new UserException("管理员密码长度不能小于8位");
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}
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this.password = newPassword;
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}
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}
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54
src/chapter4/demo49/UserManager.java
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54
src/chapter4/demo49/UserManager.java
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@ -0,0 +1,54 @@
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package chapter4.demo49;
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import java.util.HashMap;
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import java.util.Map;
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class UserManager {
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// 保证单例模式
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private static UserManager instance;
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// 存储所有用户
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private Map<String, AbstractUser> users;
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private UserManager() {
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users = new HashMap<>();
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// 初始化一个管理员账号
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users.put("admin", new AdminUser("admin", "admin123"));
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}
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// 单例模式
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public static UserManager getInstance() {
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if (instance == null) {
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instance = new UserManager();
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}
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return instance;
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}
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public void addUser(AbstractUser user) throws UserException {
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if (users.containsKey(user.getUsername())) {
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throw new UserException("用户名已存在！");
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}
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users.put(user.getUsername(), user);
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}
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public AbstractUser login(String username, String password) throws UserException {
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AbstractUser user = users.get(username);
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if (user == null) {
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throw new UserException("用户不存在！");
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}
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if (!user.checkPassword(password)) {
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throw new UserException("用户名或密码错误！");
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}
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return user;
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}
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public void removeUser(String username) {
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users.remove(username);
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}
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public void showAllUsers() {
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System.out.println("当前系统用户列表：");
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for (AbstractUser user : users.values()) {
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user.showInfo();
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}
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}
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}
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