上传文件至 'w10-巫秋雨-202506050320'

w10-巫秋雨-202506050320/AnalyzeCommand.java

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+package com.example.datacollect.command;
+
+import com.example.datacollect.model.Article;
+import com.example.datacollect.repository.ArticleRepository;
+import com.example.datacollect.strategy.CrawlStrategy;
+import com.example.datacollect.strategy.StrategyFactory;
+import org.jsoup.Jsoup;
+import org.jsoup.nodes.Document;
+import java.io.IOException;
+import java.util.List;
+
+public class AnalyzeCommand implements Command {
+
+    private final StrategyFactory strategyFactory;
+
+    public AnalyzeCommand(StrategyFactory strategyFactory) {
+        this.strategyFactory = strategyFactory;
+    }
+
+    // 1. 实现 Command 接口的 getName() 方法
+    @Override
+    public String getName() {
+        return "analyze";
+    }
+
+    // 2. 实现 Command 接口的 execute() 方法（必须和接口签名一致，带 ArticleRepository 参数）
+    @Override
+    public void execute(String[] args, ArticleRepository repository) {
+        // 参数校验：用户必须传入要分析的URL
+        if (args.length < 2) {
+            System.out.println("[错误] 请输入要分析的URL，格式：analyze <url>");
+            return;
+        }
+        String url = args[1];
+
+        // 用工厂匹配对应的解析策略
+        CrawlStrategy strategy = strategyFactory.getStrategy(url);
+        if (strategy == null) {
+            System.out.println("[错误] 不支持解析该URL：" + url);
+            return;
+        }
+
+        // 爬取网页源码
+        Document doc;
+        try {
+            doc = Jsoup.connect(url)
+                    .timeout(5000)
+                    .get();
+        } catch (IOException e) {
+            System.out.println("[错误] 网页爬取失败：" + e.getMessage());
+            return;
+        }
+
+        // ====================== 作业核心逻辑 ======================
+        // 复用策略解析网页，但不存入仓库（不调用 repository.add 或 addAll）
+        List<Article> articles = strategy.parse(url, doc);
+
+        // 输出统计信息
+        printAnalysisResult(articles, url);
+        // ==========================================================
+    }
+
+    /**
+     * 打印分析结果：统计文章数量、标题平均长度等信息
+     */
+    private void printAnalysisResult(List<Article> articles, String url) {
+        System.out.println("\n===== 网页分析结果（不存储数据） =====");
+        System.out.println("分析URL：" + url);
+        System.out.println("解析到文章数量：" + articles.size());
+
+        if (!articles.isEmpty()) {
+            // 统计标题平均长度
+            int totalTitleLength = 0;
+            for (Article article : articles) {
+                totalTitleLength += article.getTitle().length();
+            }
+            double avgTitleLength = (double) totalTitleLength / articles.size();
+            System.out.printf("文章标题平均长度：%.2f 字符\n", avgTitleLength);
+
+            // 打印前3篇文章标题预览
+            System.out.println("\n前3篇文章标题预览：");
+            for (int i = 0; i < Math.min(3, articles.size()); i++) {
+                System.out.println((i + 1) + ". " + articles.get(i).getTitle());
+            }
+        } else {
+            System.out.println("未解析到任何文章内容");
+        }
+        System.out.println("=====================================\n");
+    }
+}

w10-巫秋雨-202506050320/ArticleRepository.java

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+package com.example.datacollect.repository;
+
+import com.example.datacollect.model.Article;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+public class ArticleRepository {
+    private final List<Article> articles = new ArrayList<>();
+
+    public void add(Article article) {
+        if (article == null) {
+            throw new IllegalArgumentException("Article cannot be null");
+        }
+        articles.add(article);
+    }
+    
+    public void addAll(List<Article> articleList) {
+        if (articleList == null) {
+            throw new IllegalArgumentException("列表不能为 null");
+        }
+        for (Article article : articleList) {
+            add(article); // 复用上面的 add，自动防 null
+        }
+    }
+
+    public List<Article> getAll() {
+        return Collections.unmodifiableList(articles);
+    }
+
+    public int size() {
+        return articles.size();
+    }
+
+    public void clear() {
+        articles.clear();
+    }
+}