上传文件至 'w9'

w9/ExitCommand.java

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+import java.util.List;
+
+public class ExitCommand implements Command {
+    private final ConsoleView view;
+    public ExitCommand(ConsoleView v) { this.view = v; }
+
+    @Override public String getName() { return "exit"; }
+
+    @Override
+    public void execute(String[] args, List<Article> articles) {
+        view.printSuccess("Bye!");
+        System.exit(0);
+    }
+}

w9/HelpCommand.java

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+import java.util.List;
+
+public class HelpCommand implements Command {
+    private final ConsoleView view;
+    public HelpCommand(ConsoleView v) { this.view = v; }
+
+    @Override public String getName() { return "help"; }
+
+    @Override
+    public void execute(String[] args, List<Article> articles) {
+        view.printInfo("可用命令：");
+        view.printInfo("  crawl <url>   抓取指定 URL 的文章 (别名: c)");
+        view.printInfo("  list          列出所有已抓取的文章");
+        view.printInfo("  history       显示历史命令记录");
+        view.printInfo("  help          显示帮助信息");
+        view.printInfo("  exit          退出程序");
+    }
+}

w9/HistoryCommand.java

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+import java.util.List;
+
+/**
+ * 作业2：HistoryCommand
+ * 记录并展示用户输入过的所有命令（用 List<String> 存储）
+ */
+public class HistoryCommand implements Command {
+    private final ConsoleView view;
+    private final List<String> history;   // 由 Controller 注入，共享同一个列表
+
+    public HistoryCommand(ConsoleView v, List<String> history) {
+        this.view    = v;
+        this.history = history;
+    }
+
+    @Override public String getName() { return "history"; }
+
+    @Override
+    public void execute(String[] args, List<Article> articles) {
+        if (history.isEmpty()) {
+            view.printInfo("暂无历史记录。");
+            return;
+        }
+        view.printBold("── 历史命令 (" + history.size() + " 条) ──");
+        for (int i = 0; i < history.size(); i++) {
+            view.printInfo(String.format("%3d  %s", i + 1, history.get(i)));
+        }
+    }
+}

w9/ListCommand.java

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+import java.util.List;
+
+public class ListCommand implements Command {
+    private final ConsoleView view;
+    public ListCommand(ConsoleView v) { this.view = v; }
+
+    @Override public String getName() { return "list"; }
+
+    @Override
+    public void execute(String[] args, List<Article> articles) {
+        view.display(articles);
+    }
+}