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main
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jinzhibo_b
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Manifest-Version: 1.0
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Main-Class: MathLearningApp
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Class-Path: .
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import service.QuestionService;
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import model.Question;
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import service.OptionsResult;
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import java.util.List;
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class Test {
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public static void main(String[] args) {
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System.out.println("=== 测试题目生成 ===\n");
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QuestionService questionService = new QuestionService();
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List<Question> questions = questionService.generateQuestions("高中", 30);
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for (int i = 0; i < questions.size(); i++) {
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Question question = questions.get(i);
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System.out.println((i + 1) + ". " + question.getContent());
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// 通过 OptionsResult 获取选项列表
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OptionsResult optionsResult = question.getOptions();
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List<String> options = optionsResult.getOptions();
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System.out.print(" 选项: ");
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for (int j = 0; j < options.size(); j++) {
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char optionChar = (char) ('A' + j);
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System.out.print(optionChar + "." + options.get(j) + " ");
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}
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char correctChar = (char) ('A' + optionsResult.getCorrectIndex());
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System.out.println(" [答案:" + correctChar + "]");
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System.out.println();
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}
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}
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}
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@ -1,21 +0,0 @@
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package model;
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import java.util.List;
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public class Exam {
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private List<Question> questions;
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private String difficulty;
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public Exam(List<Question> questions, String difficulty) {
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this.questions = questions;
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this.difficulty = difficulty;
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}
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public List<Question> getQuestions() {
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return questions;
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}
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public String getDifficulty() {
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return difficulty;
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}
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}
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@ -1,34 +0,0 @@
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package model;
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import java.util.List;
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import service.OptionsResult;
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public class Question {
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private String content;
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private OptionsResult options;
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private int correctPos;
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private String difficulty;
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public Question(String content, OptionsResult options, int correctPos, String difficulty) {
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this.content = content;
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this.options = options;
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this.correctPos = correctPos;
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this.difficulty = difficulty;
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}
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public String getContent() {
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return content;
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}
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public OptionsResult getOptions() {
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return options;
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}
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public int getCorrectAnswer() {
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return correctPos;
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}
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public String getDifficulty() {
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return difficulty;
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}
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}
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package model;
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import java.io.Serializable;
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public class User implements Serializable {
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private String email;
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private String password;
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private String registrationCode;
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private boolean isRegistered;
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public User(String email, String registrationCode) {
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this.email = email;
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this.registrationCode = registrationCode;
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this.isRegistered = false;
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this.password = null;
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}
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public String getEmail() {
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return email;
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}
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public String getPassword() {
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return password;
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}
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public void setPassword(String password) {
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this.password = password;
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}
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public String getRegistrationCode() {
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return registrationCode;
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}
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public boolean isRegistered() {
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return isRegistered;
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}
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public void setRegistered(boolean registered) {
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isRegistered = registered;
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}
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}
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package service;
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import model.Question;
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import java.util.List;
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import java.util.ArrayList;
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import java.util.HashSet;
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import java.util.Set;
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import java.util.Collections;
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import java.util.Random;
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public abstract class AbstractQuestionGenerator implements QuestionGenerator {
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protected String difficulty;
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protected Random random = new Random();
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public AbstractQuestionGenerator(String difficulty) {
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this.difficulty = difficulty;
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}
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@Override
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public OptionsResult generateOptions(int correct) {
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List<String> options = new ArrayList<>();
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Set<Integer> used = new HashSet<>();
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used.add(correct);
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// 先生成3个错误选项
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while (options.size() < 3) {
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int wrong = correct + (int)(Math.random() * 10) - 5;
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if (!used.contains(wrong) && wrong != correct) {
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options.add(String.valueOf(wrong));
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used.add(wrong);
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}
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}
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// 在随机位置插入正确答案
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int correctPosition = (int)(Math.random() * 4); // 0-3的随机位置
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options.add(correctPosition, String.valueOf(correct));
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return new OptionsResult(options, correctPosition);
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}
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public String getDifficulty() {
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return difficulty;
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}
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protected int getRandomOperand() {
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return random.nextInt(20)+1;
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}
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protected String getRandomOperator(String[] operators) {
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return operators[random.nextInt(operators.length)];
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}
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}
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@ -1,21 +0,0 @@
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package service;
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import java.util.List;
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public class OptionsResult {
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private List<String> options;
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private int correctIndex;
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public OptionsResult(List<String> options, int correctIndex) {
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this.options = options;
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this.correctIndex = correctIndex;
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}
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public List<String> getOptions() {
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return options;
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}
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public int getCorrectIndex() {
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return correctIndex;
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}
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}
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package service;
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import model.Question;
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import java.util.List;
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public interface QuestionGenerator {
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Question generateQuestion();
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OptionsResult generateOptions(int correctAnswer);
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}
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package service;
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import java.util.HashMap;
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import java.util.Map;
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public class QuestionGeneratorFactory {
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private static final Map<String, QuestionGenerator> generators = new HashMap<>();
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static {
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generators.put("小学", new PrimaryQuestionGenerator());
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generators.put("初中", new MiddleSchoolQuestionGenerator());
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generators.put("高中", new HighSchoolQuestionGenerator());
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}
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public static QuestionGenerator getGenerator(String difficulty) {
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return generators.getOrDefault(difficulty, generators.get("小学"));
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}
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}
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package service;
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import model.Question;
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import java.util.*;
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public class QuestionService {
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/*生成试卷的题目部分*/
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public List<Question> generateQuestions(String difficulty, int count) {
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if(count < 10 || count > 30) {
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return null;
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}
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List<Question> questions = new ArrayList<>();
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Set<String> usedQuestions = new HashSet<>();
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QuestionGenerator generator = QuestionGeneratorFactory.getGenerator(difficulty);
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while (questions.size() < count) {
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Question q = generator.generateQuestion();
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if (usedQuestions.add(q.getContent())) {
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questions.add(q);
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}
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}
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return questions;
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}
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}
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package service;
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import model.User;
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import utils.FileStorage;
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import utils.PasswordValidator;
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import java.util.HashMap;
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import java.util.Map;
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public class UserService {
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private Map<String, User> users = new HashMap<>();
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private FileStorage fileStorage = new FileStorage();
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public UserService() {
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users = fileStorage.loadUsers(); //加载所有已有的用户
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}
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/*注册用户第一阶段-生成验证码*/
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public String registerUser(String email) {
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if (users.containsKey(email) && users.get(email).isRegistered()){
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return "registered"; //注册过的用户不能再注册
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//return null;
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}
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if (users.containsKey(email)) {
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return "recheck your email"; //已发过验证码也不再发了
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//return null;
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}
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String code = String.valueOf(100000 + (int)(Math.random() * 900000)); //生成6位注册码
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users.put(email, new User(email, code));
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fileStorage.saveUsers(users);
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return code;
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}
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/*注册用户第二阶段-完成注册*/
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public boolean completeRegistration(String email, String code, String password) {
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User user = users.get(email);
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if (user != null && user.getRegistrationCode().equals(code) && PasswordValidator.isValid(password)) {
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user.setPassword(password);
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user.setRegistered(true);
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fileStorage.saveUsers(users);
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return true;
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}
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return false;
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}
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/*用户登录*/
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public boolean login(String email, String password) {
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User user = users.get(email);
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return user != null && user.isRegistered() && user.getPassword().equals(password);
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}
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/*修改密码*/
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public boolean changePassword(String email, String oldPassword, String newPassword) {
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User user = users.get(email);
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if (user != null && user.getPassword().equals(oldPassword) && PasswordValidator.isValid(newPassword)) {
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user.setPassword(newPassword);
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fileStorage.saveUsers(users);
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return true;
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}
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return false;
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}
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}
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package utils;
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import java.util.regex.Pattern;
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public class EmailValidator {
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private static final Pattern EMAIL_PATTERN = Pattern.compile("^[A-Za-z0-9+_.-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}$");
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/*只检查邮箱的格式是否正确，但不保证这个邮箱存在*/
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public static boolean isValid(String email) {
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return email != null && EMAIL_PATTERN.matcher(email).matches();
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}
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}
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package utils;
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import model.User;
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import java.io.*;
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import java.util.HashMap;
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import java.util.Map;
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public class FileStorage {
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/*完全擦除原来的文件并重新写入*/
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public void saveUsers(Map<String, User> users) {
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try (ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("users.dat"))) {
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oos.writeObject(users);
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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/*从文件中载入*/
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@SuppressWarnings("unchecked")
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public Map<String, User> loadUsers() {
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File file = new File("users.dat");
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if (!file.exists()) return new HashMap<>();
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try (ObjectInputStream ois = new ObjectInputStream(new FileInputStream("users.dat"))) {
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return (Map<String, User>) ois.readObject();
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} catch (Exception e) {
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return new HashMap<>();
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}
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}
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}
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@ -1,18 +0,0 @@
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package utils;
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public class PasswordValidator {
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public static boolean isValid(String password) {
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if (password == null || password.length() < 6 || password.length() > 10) {
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return false;
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}
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boolean hasUpper = false;
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boolean hasLower = false;
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boolean hasDigit = false;
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for (char c : password.toCharArray()) {
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if (Character.isUpperCase(c)) hasUpper = true;
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if (Character.isLowerCase(c)) hasLower = true;
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if (Character.isDigit(c)) hasDigit = true;
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}
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return hasUpper && hasLower && hasDigit;
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}
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}
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