上传文件至 'project'

project/HelpCommand.java

@@ -0,0 +1,21 @@
+package command;
+
+import controller.CrawlerController;
+
+public class HelpCommand implements Command {
+    private CrawlerController controller;
+    
+    public HelpCommand(CrawlerController controller) {
+        this.controller = controller;
+    }
+    
+    @Override
+    public void execute() {
+        controller.getView().showHelp();
+    }
+    
+    @Override
+    public String getDescription() {
+        return "显示帮助信息";
+    }
+}

project/ListCommand.java

@@ -0,0 +1,35 @@
+package command;
+
+import controller.CrawlerController;
+import java.util.List;
+import model.Article;
+
+public class ListCommand implements Command {
+    private CrawlerController controller;
+    
+    public ListCommand(CrawlerController controller) {
+        this.controller = controller;
+    }
+    
+    @Override
+    public void execute() {
+        List<Article> articles = controller.getArticles();
+        if (articles.isEmpty()) {
+            controller.getView().showMessage("暂无数据");
+            return;
+        }
+        
+        controller.getView().showMessage("\n已爬取的数据列表：");
+        for (int i = 0; i < articles.size(); i++) {
+            Article article = articles.get(i);
+            controller.getView().showMessage(
+                String.format("[%d] %s - %s", i + 1, article.getSource(), article.getTitle())
+            );
+        }
+    }
+    
+    @Override
+    public String getDescription() {
+        return "显示已爬取的数据列表";
+    }
+}

project/SaveCommand.java

@@ -0,0 +1,40 @@
+package command;
+
+import model.Article;
+import controller.CrawlerController;
+import util.FileUtil;
+import java.util.List;
+
+public class SaveCommand implements Command {
+    private CrawlerController controller;
+    
+    public SaveCommand(CrawlerController controller) {
+        this.controller = controller;
+    }
+    
+    @Override
+    public void execute() {
+        try {
+            List<Article> articles = controller.getArticles();
+            if (articles.isEmpty()) {
+                controller.getView().showMessage("没有数据可保存");
+                return;
+            }
+            
+            for (Article article : articles) {
+                FileUtil.saveArticle(article);
+            }
+            
+            FileUtil.saveArticles(articles, "summary.txt");
+            
+            controller.getView().showMessage("已保存 " + articles.size() + " 条数据到 data/ 目录");
+        } catch (Exception e) {
+            controller.getView().showError("保存失败: " + e.getMessage());
+        }
+    }
+    
+    @Override
+    public String getDescription() {
+        return "保存数据到文件";
+    }
+}