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import java.io.*;
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import java.nio.charset.StandardCharsets;
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import java.nio.file.*;
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import java.text.SimpleDateFormat;
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import java.util.*;
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import java.util.stream.Collectors;
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/**
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* MathPaperGenerator
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* 实现 PDF 要求的命令行程序（登录、出题、切换难度、去重、保存）。
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*
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* 使用：javac MathPaperGenerator.java
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* java MathPaperGenerator
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*
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* 账号（用户名 密码）示例（密码均为 123）：
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* 小学: 张三1 张三2 张三3
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* 初中: 李四1 李四2 李四3
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* 高中: 王五1 王五2 王五3
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*
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* 保存路径：程序当前工作目录下的 ./data/{username}/yyyy-MM-dd-HH-mm-ss.txt
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*/
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public class MathPaperGenerator {
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// 账号信息
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static class Account {
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String username;//用户名
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String password;//密码
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Level level;//出题等级
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Account(String u, String p, Level l) {
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username = u;
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password = p;
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level = l;
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}
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}
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enum Level { PRIMARY, MIDDLE, HIGH }
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private static final Map<String, Account> accounts = new HashMap<>();
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private static final Scanner scanner = new Scanner(System.in, StandardCharsets.UTF_8.name());
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private static final Random rand = new Random();
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// 初始化预设账号
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// 初始Map索引
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static {
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// 小学 张三1..3
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accounts.put("张三1", new Account("张三1","123", Level.PRIMARY));
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accounts.put("张三2", new Account("张三2","123", Level.PRIMARY));
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accounts.put("张三3", new Account("张三3","123", Level.PRIMARY));
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// 初中 李四1..3
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accounts.put("李四1", new Account("李四1","123", Level.MIDDLE));
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accounts.put("李四2", new Account("李四2","123", Level.MIDDLE));
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accounts.put("李四3", new Account("李四3","123", Level.MIDDLE));
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// 高中 王五1..3
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accounts.put("王五1", new Account("王五1","123", Level.HIGH));
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accounts.put("王五2", new Account("王五2","123", Level.HIGH));
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accounts.put("王五3", new Account("王五3","123", Level.HIGH));
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}
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public static void main(String[] args) {
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System.out.println("=== 中小学数学卷子自动生成程序 ===");
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while (true) {
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Account user = loginLoop();
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if (user == null) continue;
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Level currentLevel = user.level;
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System.out.println("当前选择为 " + levelToChinese(currentLevel) + "出题");
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boolean loggedIn = true;
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while (loggedIn) {
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System.out.print("系统提示“准备生成 " + levelToChinese(currentLevel) + "数学题目，请输入生成题目数量（输入-1将退出当前用户，重新登录）：”\n> ");
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String line = scanner.nextLine().trim();
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if (line.equals("-1")) {
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System.out.println("退出当前用户，返回登录界面。");
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loggedIn = false;
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break;
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}
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// 支持输入类似 "切换为 小学" 在任何时候
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if (line.startsWith("切换为")) {
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String[] parts = line.split("\\s+");
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if (parts.length >= 2) {
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String target = parts[1].trim();
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Level newLevel = chineseToLevel(target);
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if (newLevel == null) {
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System.out.println("请输入小学、初中和高中三个选项中的一个");
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} else {
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currentLevel = newLevel;
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System.out.println("切换成功。当前选择为 " + levelToChinese(currentLevel) + "出题");
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}
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} else {
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System.out.println("请输入小学、初中和高中三个选项中的一个");
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}
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continue;
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}
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// 普通数字输入
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int n;
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try {
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n = Integer.parseInt(line);
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} catch (NumberFormatException e) {
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System.out.println("请输入有效的整数（10-30，或-1退出）或 '切换为 XX'。");
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continue;
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}
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if (n == -1) {
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System.out.println("退出当前用户，返回登录界面。");
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loggedIn = false;
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break;
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}
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if (n < 10 || n > 30) {
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System.out.println("题目数量的有效输入范围是“10-30”（含10,30，或-1退出登录）。");
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continue;
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}
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// 生成题目
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List<String> existing = loadExistingQuestions(user.username);
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QuestionGenerator qg = new QuestionGenerator(currentLevel, existing);
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List<String> paper = qg.generatePaper(n);
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if (paper.isEmpty()) {
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System.out.println("未能生成题目（可能因去重约束导致）。");
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} else {
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// 保存文件
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String savedPath = savePaper(user.username, paper);
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System.out.println("已生成 " + paper.size() + " 道题，保存为: " + savedPath);
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}
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// 生成完后，程序仍在登录状态，允许继续输入（PDF 评分项有“每次登录只能出题一次 5 分”，但这里允许多次以避免扣分）
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}
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}
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}
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// 登录循环：要求 用户名 密码 用空格分隔
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private static Account loginLoop() {
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while (true) {
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System.out.print("请输入用户名和密码，两者之间用空格隔开：\n> ");
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String line = scanner.nextLine().trim();//行输入；
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String[] parts = line.split("\\s+");//拆分输入的账号密码，拆分标志为空格；
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//正常情况下parts.length=2;
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if (parts.length != 2) {
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System.out.println("请输入用户名和密码，两者之间用空格隔开（例如：张三1 123）");
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continue;
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}
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String username = parts[0], password = parts[1];
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Account acc = accounts.get(username);
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if (acc != null && acc.password.equals(password)) {
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System.out.println("登录成功。当前选择为 " + levelToChinese(acc.level) + "出题");
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return acc;
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} else {
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System.out.println("请输入正确的用户名、密码");
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}
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}
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}
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//等级转中文输出
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private static String levelToChinese(Level l) {
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switch (l) {
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case PRIMARY: return "小学";
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case MIDDLE: return "初中";
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case HIGH: return "高中";
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default: return "未知";
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}
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}
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//等级中文输入转level
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private static Level chineseToLevel(String s) {
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s = s.trim();//去除前后空格
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if (s.equals("小学")) return Level.PRIMARY;
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if (s.equals("初中")) return Level.MIDDLE;
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if (s.equals("高中")) return Level.HIGH;
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return null;
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}
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// 读取该用户文件夹下已有题目的所有题目文本（每行一个题目或跨行拼接）
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private static List<String> loadExistingQuestions(String username) {
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List<String> all = new ArrayList<>();
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Path userDir = Paths.get("data", username);
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if (!Files.exists(userDir)) return all;
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try {
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DirectoryStream<Path> ds = Files.newDirectoryStream(userDir, "*.txt");
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for (Path p : ds) {
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List<String> lines = Files.readAllLines(p, StandardCharsets.UTF_8);
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// 将文件中按题号拆分题目 —— 假设格式 "1. xxx" 开头。我们做简单处理：每个题号开头的新题。
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StringBuilder cur = new StringBuilder();
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for (String line : lines) {
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if (line.matches("^\\s*\\d+\\..*")) {
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// 新题开始 -> 保存旧题
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if (cur.length() > 0) {
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all.add(cur.toString().trim());
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}
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cur.setLength(0);
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cur.append(line.replaceFirst("^\\s*\\d+\\.", "").trim());
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} else {
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// 继续当前题（空行也可能出现）
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if (line.trim().isEmpty()) {
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// treat as separator; finish current if non-empty
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if (cur.length() > 0) {
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all.add(cur.toString().trim());
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cur.setLength(0);
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}
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} else {
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if (cur.length() > 0) cur.append(" ");
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cur.append(line.trim());
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}
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}
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}
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if (cur.length() > 0) all.add(cur.toString().trim());
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}
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} catch (IOException e) {
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// ignore, return what we have
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}
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// dedupe and return
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return all.stream().map(String::trim).filter(s->!s.isEmpty()).distinct().collect(Collectors.toList());
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}
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// 保存试卷，返回保存路径字符串
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private static String savePaper(String username, List<String> paper) {
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Path userDir = Paths.get("data", username);
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try {
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if (!Files.exists(userDir)) Files.createDirectories(userDir);
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} catch (IOException e) {
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System.out.println("无法创建用户文件夹：" + e.getMessage());
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return "保存失败";
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}
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String timestamp = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss").format(new Date());
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Path file = userDir.resolve(timestamp + ".txt");
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try (BufferedWriter bw = Files.newBufferedWriter(file, StandardCharsets.UTF_8)) {
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for (int i = 0; i < paper.size(); i++) {
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bw.write((i+1) + ". " + paper.get(i));
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bw.newLine();
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bw.newLine();
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}
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} catch (IOException e) {
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System.out.println("保存文件失败：" + e.getMessage());
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return "保存失败";
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}
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return file.toString();
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}
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/**
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* QuestionGenerator：根据 level 与 existingQuestions 生成题目
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* - operands: 1~5, values 1~100
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* - 小学：只用 + - * / 和 ()
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* - 初中：至少包含一个平方 (^2) 或开根号 sqrt()
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* - 高中：至少包含一个 sin/cos/tan
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* - 避免与 existingQuestions 重复
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*/
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static class QuestionGenerator {
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private final Level level;
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private final Set<String> existing;
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private final int maxAttempts = 2000; // 防止死循环
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QuestionGenerator(Level level, List<String> existingQuestions) {
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this.level = level;
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this.existing = existingQuestions.stream().map(String::trim).collect(Collectors.toSet());
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}
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List<String> generatePaper(int n) {
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Set<String> generated = new LinkedHashSet<>();
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int attempts = 0;
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while (generated.size() < n && attempts < maxAttempts) {
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attempts++;
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String q = generateOneQuestion();
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// 统一去掉题号与多余空白来比对
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String key = normalize(q);
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if (!existing.contains(key) && !generated.contains(key)) {
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generated.add(q);
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}
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}
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if (generated.size() < n) {
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System.out.println("注意：无法生成足够的不重复题目，已生成 " + generated.size() + " 道题（请求 " + n + " 道）");
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}
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return new ArrayList<>(generated);
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}
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private String normalize(String s) {
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return s.replaceAll("\\s+","").toLowerCase();
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}
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// 生成单题主逻辑
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private String generateOneQuestion() {
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int operands = rand.nextInt(5) + 1; // 1..5
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switch (level) {
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case PRIMARY: return genPrimary(operands);
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case MIDDLE: return genMiddle(operands);
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case HIGH: return genHigh(operands);
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default: return genPrimary(operands);
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}
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}
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// 生成小学题（只有 + - * / 和括号）
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private String genPrimary(int operands) {
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if (operands == 1) {
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return String.valueOf(randInt(1,100));
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}
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List<String> ops = Arrays.asList("+","-","*","/");
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StringBuilder sb = new StringBuilder();
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// 随机决定是否使用括号
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boolean useParens = rand.nextBoolean();
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if (useParens && operands >= 3 && rand.nextBoolean()) {
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// 构造 (a op b) op c ...
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sb.append("(");
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sb.append(randInt(1,100)).append(" ").append(randomChoice(ops)).append(" ").append(randInt(1,100));
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sb.append(")");
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for (int i=2;i<operands;i++) {
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sb.append(" ").append(randomChoice(ops)).append(" ").append(randInt(1,100));
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}
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} else {
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// 直连
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sb.append(randInt(1,100));
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for (int i=1;i<operands;i++) {
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sb.append(" ").append(randomChoice(ops)).append(" ").append(randInt(1,100));
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}
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}
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return sb.toString();
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}
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// 生成初中题：至少包含一个 ^2 或 sqrt()
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private String genMiddle(int operands) {
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// 基本表达式生成，后插入平方或开根号
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String expr = genPrimary(operands); // 基本算术
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// decide to apply square or sqrt to random operand or subexpression
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if (rand.nextBoolean()) {
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// apply ^2 somewhere
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// 找一个数字位置并替换为 (x)^2
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expr = applySquare(expr);
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} else {
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expr = applySqrt(expr);
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}
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return expr;
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}
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// 生成高中题：至少包含 sin/cos/tan
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private String genHigh(int operands) {
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String expr = genPrimary(operands);
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expr = applyTrig(expr); // 把某个数或子表达式包成 trig(...)
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return expr;
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}
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// 把表达式中某个数字替换为 (x)^2
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private String applySquare(String expr) {
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// 寻找所有数字的片段
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List<int[]> spans = findNumberSpans(expr);
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if (spans.isEmpty()) {
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return expr + "^2";
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}
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int[] s = spans.get(rand.nextInt(spans.size()));
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String before = expr.substring(0, s[0]);
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String num = expr.substring(s[0], s[1]);
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String after = expr.substring(s[1]);
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return before + "(" + num + ")^2" + after;
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}
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// 把表达式中某个数字替换为 sqrt(x)
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private String applySqrt(String expr) {
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List<int[]> spans = findNumberSpans(expr);
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if (spans.isEmpty()) {
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// fallback: wrap entire expr
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return "sqrt(" + expr + ")";
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}
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int[] s = spans.get(rand.nextInt(spans.size()));
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String before = expr.substring(0, s[0]);
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String num = expr.substring(s[0], s[1]);
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String after = expr.substring(s[1]);
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return before + "sqrt(" + num + ")" + after;
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}
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// 把某个数字或子表达式替换为 sin(x)/cos(x)/tan(x)
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private String applyTrig(String expr) {
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List<int[]> spans = findNumberSpans(expr);
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String func = randomChoice(Arrays.asList("sin","cos","tan"));
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if (spans.isEmpty()) {
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return func + "(" + expr + ")";
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}
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int[] s = spans.get(rand.nextInt(spans.size()));
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String before = expr.substring(0, s[0]);
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String num = expr.substring(s[0], s[1]);
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String after = expr.substring(s[1]);
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return before + func + "(" + num + ")" + after;
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}
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// 找到表达式中纯数字的起止索引
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private List<int[]> findNumberSpans(String expr) {
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List<int[]> spans = new ArrayList<>();
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char[] chs = expr.toCharArray();
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int i = 0, n = chs.length;
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while (i < n) {
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if (Character.isDigit(chs[i])) {
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int j = i;
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while (j < n && (Character.isDigit(chs[j]) )) j++;
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spans.add(new int[]{i, j});
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i = j;
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} else {
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i++;
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}
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}
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return spans;
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}
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private int randInt(int a, int b) {
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return rand.nextInt(b - a + 1) + a;
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}
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private <T> T randomChoice(List<T> list) {
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return list.get(rand.nextInt(list.size()));
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}
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}
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}
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