55 lines
1.5 KiB
Java
55 lines
1.5 KiB
Java
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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