上传文件至 'w9'

w9/Article.java

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+import java.time.LocalDate;
+import java.time.format.DateTimeFormatter;
+
+/**
+ * Model: 文章实体，只存放数据，无任何 I/O 代码
+ */
+public class Article {
+    private String title;
+    private String url;
+    private String content;
+    private String author;                          // 作业1：新增 author
+    private LocalDate publishDate;                  // 作业1：新增 publishDate
+
+    public Article(String title, String url, String content,
+                   String author, LocalDate publishDate) {
+        this.title       = title;
+        this.url         = url;
+        this.content     = content;
+        this.author      = author;
+        this.publishDate = publishDate;
+    }
+
+    // ── getters ──
+    public String    getTitle()       { return title; }
+    public String    getUrl()         { return url; }
+    public String    getContent()     { return content; }
+    public String    getAuthor()      { return author; }
+    public LocalDate getPublishDate() { return publishDate; }
+
+    @Override
+    public String toString() {
+        String dateStr = (publishDate != null)
+            ? publishDate.format(DateTimeFormatter.ISO_LOCAL_DATE) : "unknown";
+        return String.format("[%s] %s  (by %s, %s)", url, title, author, dateStr);
+    }
+}

w9/Command.java

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+import java.util.List;
+
+/**
+ * Command 接口：所有命令必须实现
+ */
+public interface Command {
+    String getName();
+    void execute(String[] args, List<Article> articles);
+}

w9/ConsoleView.java

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+import java.util.List;
+import java.util.Scanner;
+
+/**
+ * View: 所有 I/O 集中在这里，颜色常量统一管理
+ * 选做暗色主题：只需改 THEME_PRIMARY / THEME_SECONDARY 两个常量即可
+ */
+public class ConsoleView {
+
+    // ── ANSI 基础色 ──
+    private static final String ANSI_RESET  = "\033[0m";
+    private static final String ANSI_GREEN  = "\033[32m";
+    private static final String ANSI_RED    = "\033[31m";
+    private static final String ANSI_YELLOW = "\033[33m";
+    private static final String ANSI_CYAN   = "\033[36m";
+    private static final String ANSI_BOLD   = "\033[1m";
+
+    // ── 选做：主题常量（暗色主题只改这两行）──
+    private static final String THEME_PRIMARY   = ANSI_CYAN;    // 暗色主题可换 ANSI_GREEN
+    private static final String THEME_SECONDARY = ANSI_YELLOW;  // 暗色主题可换 ANSI_CYAN
+
+    private final Scanner scanner = new Scanner(System.in);
+
+    public void printSuccess(String msg) {
+        System.out.println(ANSI_GREEN + msg + ANSI_RESET);
+    }
+
+    public void printError(String msg) {
+        System.out.println(ANSI_RED + "[ERROR] " + msg + ANSI_RESET);
+    }
+
+    public void printInfo(String msg) {
+        System.out.println(THEME_PRIMARY + msg + ANSI_RESET);
+    }
+
+    public void printWarning(String msg) {
+        System.out.println(THEME_SECONDARY + "[WARN] " + msg + ANSI_RESET);
+    }
+
+    public void printBold(String msg) {
+        System.out.println(ANSI_BOLD + msg + ANSI_RESET);
+    }
+
+    /** 展示文章列表 */
+    public void display(List<Article> articles) {
+        if (articles.isEmpty()) {
+            printWarning("暂无文章，请先使用 crawl <url> 抓取。");
+            return;
+        }
+        printBold("── 文章列表 (" + articles.size() + " 篇) ──");
+        for (int i = 0; i < articles.size(); i++) {
+            Article a = articles.get(i);
+            if (a == null) {
+                printWarning((i + 1) + ". [null 条目，已跳过]");
+                continue;
+            }
+            System.out.printf(THEME_PRIMARY + "%2d. %s" + ANSI_RESET + "%n", i + 1, a);
+        }
+    }
+
+    /** 读取一行用户输入，显示提示符 */
+    public String readLine() {
+        System.out.print(ANSI_BOLD + "> " + ANSI_RESET);
+        return scanner.nextLine().trim();
+    }
+}

w9/CrawlCommand.java

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+import java.time.LocalDate;
+import java.util.List;
+
+/**
+ * CrawlCommand: 抓取文章并存入列表
+ * 选做：支持别名 "c" 代替 "crawl"
+ */
+public class CrawlCommand implements Command {
+    private final ConsoleView view;
+    public CrawlCommand(ConsoleView v) { this.view = v; }
+
+    @Override public String getName() { return "crawl"; }
+
+    // 选做：别名支持（由 Controller 注册两个 key 指向同一实例）
+    public String getAlias() { return "c"; }
+
+    @Override
+    public void execute(String[] args, List<Article> articles) {
+        // 参数校验
+        if (args.length < 2 || args[1].isBlank()) {
+            view.printError("用法：crawl <url>  或  c <url>");
+            return;
+        }
+        String url = args[1].trim();
+
+        // 选做：URL 格式校验
+        if (!isValidUrl(url)) {
+            view.printError("URL 格式不合法，请以 http:// 或 https:// 开头：" + url);
+            return;
+        }
+
+        // Stub：模拟抓取（真实爬取留待后续实现）
+        // 注意：字符串拼接仅用于构建提示信息（View 层职责），
+        // 业务数据直接封装进 Article，不在 Command 层做字符串展示拼接。
+        Article article = new Article(
+            "抓取文章 - " + extractDomain(url),
+            url,
+            "(stub content)",
+            "unknown",
+            LocalDate.now()
+        );
+        articles.add(article);
+        view.printSuccess("已抓取：" + article.getTitle() + "  [" + url + "]");
+    }
+
+    /** 选做：简单 URL 格式验证 */
+    private boolean isValidUrl(String url) {
+        return url.startsWith("http://") || url.startsWith("https://");
+    }
+
+    private String extractDomain(String url) {
+        try {
+            String stripped = url.replaceFirst("https?://", "");
+            int slash = stripped.indexOf('/');
+            return slash > 0 ? stripped.substring(0, slash) : stripped;
+        } catch (Exception e) {
+            return url;
+        }
+    }
+}

w9/CrawlerController.java

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+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Controller: 解析输入、分发命令、维护历史记录
+ * 严格遵守 MVC：不持有任何 System.out，所有输出走 view
+ */
+public class CrawlerController {
+    private final ConsoleView        view;
+    private final List<Article>      articles;
+    private final Map<String, Command> commands = new HashMap<>();
+    private final List<String>       history  = new ArrayList<>();  // 作业2
+
+    public CrawlerController(ConsoleView view, List<Article> articles) {
+        this.view     = view;
+        this.articles = articles;
+        registerCommands();
+    }
+
+    private void registerCommands() {
+        CrawlCommand crawl = new CrawlCommand(view);
+        register(crawl.getName(), crawl);
+        register(crawl.getAlias(), crawl);    // 选做：别名 "c"
+
+        register(new ListCommand(view));
+        register(new HelpCommand(view));
+        register(new ExitCommand(view));
+        register(new HistoryCommand(view, history));   // 作业2，注入共享 history
+    }
+
+    private void register(Command cmd) {
+        commands.put(cmd.getName(), cmd);
+    }
+
+    private void register(String key, Command cmd) {
+        commands.put(key, cmd);
+    }
+
+    /** 处理一行用户输入 */
+    public void handle(String input) {
+        if (input == null || input.isBlank()) return;
+
+        history.add(input);                           // 作业2：记录每条命令
+
+        String[] parts = input.trim().split("\\s+");
+        String   name  = parts[0].toLowerCase();
+        Command  cmd   = commands.get(name);
+
+        if (cmd == null) {
+            view.printError("未知命令：" + name + "。输入 help 查看可用命令。");
+        } else {
+            cmd.execute(parts, articles);
+        }
+    }
+}