上传文件至 '新闻网爬虫'

新闻网爬虫/HelpCommand.java

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+package com.cctv.news.command;
+
+import com.cctv.news.view.OutputView;
+
+public class HelpCommand implements Command {
+    private final OutputView view;
+
+    public HelpCommand(OutputView view) {
+        this.view = view;
+    }
+
+    @Override
+    public String getName() {
+        return "help";
+    }
+
+    @Override
+    public String getHelp() {
+        return "help - 显示帮助信息";
+    }
+
+    @Override
+    public void execute(String[] args) {
+        view.showMessage("可用命令:");
+        view.showMessage("  help  - 显示帮助信息");
+        view.showMessage("  list  - 显示已抓取的文章列表");
+        view.showMessage("  crawl - 爬取央视新闻");
+        view.showMessage("  exit  - 退出程序");
+    }
+}

新闻网爬虫/ListCommand.java

@@ -0,0 +1,36 @@
+package com.cctv.news.command;
+
+import com.cctv.news.view.OutputView;
+import java.util.List;
+
+public class ListCommand implements Command {
+    private final OutputView view;
+    private final List<String> articles;
+
+    public ListCommand(OutputView view, List<String> articles) {
+        this.view = view;
+        this.articles = articles;
+    }
+
+    @Override
+    public String getName() {
+        return "list";
+    }
+
+    @Override
+    public String getHelp() {
+        return "list - 显示已抓取的文章列表";
+    }
+
+    @Override
+    public void execute(String[] args) {
+        if (articles.isEmpty()) {
+            view.showMessage("目前没有已抓取的文章，请先使用 crawl 命令。");
+        } else {
+            view.showMessage("已抓取的文章列表:");
+            for (int i = 0; i < articles.size(); i++) {
+                view.showArticles((i + 1) + ". " + articles.get(i));
+            }
+        }
+    }
+}