上传文件至 '新闻网爬虫'

新闻网爬虫/Command.java

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+package com.cctv.news.command;
+
+public interface Command {
+    String getName();
+    String getHelp();
+    void execute(String[] args);
+}

新闻网爬虫/CrawlCommand.java

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+package com.cctv.news.command;
+
+import com.cctv.news.view.OutputView;
+import org.jsoup.Jsoup;
+import org.jsoup.nodes.Document;
+import org.jsoup.nodes.Element;
+import org.jsoup.select.Elements;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class CrawlCommand implements Command {
+    private final OutputView view;
+    private final List<String> articles;
+
+    public CrawlCommand(OutputView view, List<String> articles) {
+        this.view = view;
+        this.articles = articles;
+    }
+
+    @Override
+    public String getName() {
+        return "crawl";
+    }
+
+    @Override
+    public String getHelp() {
+        return "crawl - 爬取央视新闻";
+    }
+
+    @Override
+    public void execute(String[] args) {
+        view.showMessage("开始爬取央视新闻...");
+        try {
+            Document doc = Jsoup.connect("https://news.cctv.com/world/")
+                    .userAgent("Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36")
+                    .timeout(10000)
+                    .get();
+
+            Elements newsItems = doc.select("a.item-title");
+            if (newsItems.isEmpty()) {
+                newsItems = doc.select("h1 a, h2 a, .news-title");
+            }
+
+            List<String> newArticles = new ArrayList<>();
+            for (Element item : newsItems) {
+                String title = item.text();
+                String url = item.attr("href");
+                if (!title.isEmpty() && url.startsWith("http")) {
+                    String articleInfo = title + " - " + url;
+                    newArticles.add(articleInfo);
+                    articles.add(articleInfo);
+                }
+            }
+
+            if (newArticles.isEmpty()) {
+                view.showMessage("未能获取到文章，尝试其他选择器...");
+                Elements allLinks = doc.select("a[href]");
+                for (Element link : allLinks) {
+                    String text = link.text().trim();
+                    String href = link.attr("href");
+                    if (text.length() > 10 && href.contains("cctv.com")) {
+                        String articleInfo = text + " - " + href;
+                        newArticles.add(articleInfo);
+                        articles.add(articleInfo);
+                        if (newArticles.size() >= 10) break;
+                    }
+                }
+            }
+
+            view.showMessage("成功爬取 " + newArticles.size() + " 篇文章。");
+            view.showMessage("使用 list 命令可以查看已抓取的文章。");
+
+        } catch (IOException e) {
+            view.showError("爬取失败: " + e.getMessage());
+        }
+    }
+}

新闻网爬虫/ExitCommand.java

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+package com.cctv.news.command;
+
+import com.cctv.news.view.OutputView;
+
+public class ExitCommand implements Command {
+    private final OutputView view;
+
+    public ExitCommand(OutputView view) {
+        this.view = view;
+    }
+
+    @Override
+    public String getName() {
+        return "exit";
+    }
+
+    @Override
+    public String getHelp() {
+        return "exit - 退出程序";
+    }
+
+    @Override
+    public void execute(String[] args) {
+        view.showMessage("感谢使用央视新闻爬虫，再见！");
+        System.exit(0);
+    }
+}

新闻网爬虫/Main.java

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+package com.cctv.news;
+
+import com.cctv.news.command.*;
+import com.cctv.news.controller.CommandController;
+import com.cctv.news.view.ConsoleView;
+import com.cctv.news.view.OutputView;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Scanner;
+
+public class Main {
+    public static void main(String[] args) {
+        OutputView view = new ConsoleView();
+        List<String> articles = new ArrayList<>();
+        CommandController controller = new CommandController(view);
+
+        controller.registerCommand(new HelpCommand(view));
+        controller.registerCommand(new ListCommand(view, articles));
+        controller.registerCommand(new CrawlCommand(view, articles));
+        controller.registerCommand(new ExitCommand(view));
+
+        view.showWelcome();
+        view.showMessage("输入 help 查看可用命令");
+
+        Scanner scanner = new Scanner(System.in);
+        while (true) {
+            view.showPrompt();
+            String input = scanner.nextLine();
+            controller.executeCommand(input);
+        }
+    }
+}