上传文件至 'w10'

思考题解答：两个策略都 supports 同一 URL 时怎么办？
解决方案：优先级机制
优势：
1.确定性：多个策略匹配时，总是选择优先级最高的
2.灵活性：可动态调整策略优先级
3.可扩展性：新增策略只需实现接口并设置合适的优先级
4.健壮性：总有默认策略兜底，不会返回 null

w10/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 com.example.datacollect.view.ConsoleView;
+import org.jsoup.Jsoup;
+import org.jsoup.nodes.Document;
+
+import java.util.List;
+
+public class AnalyzeCommand implements Command {
+    private final ConsoleView view;
+    private final StrategyFactory strategyFactory;
+
+    public AnalyzeCommand(ConsoleView view, StrategyFactory strategyFactory) {
+        this.view = view;
+        this.strategyFactory = strategyFactory;
+    }
+
+    @Override
+    public String getName() {
+        return "analyze";
+    }
+
+    @Override
+    public void execute(String[] args, ArticleRepository repository) {
+        if (args.length < 2) {
+            view.printError("Usage: analyze <url>");
+            return;
+        }
+        String url = args[1];
+
+        CrawlStrategy strategy = strategyFactory.getStrategy(url);
+        if (strategy == null) {
+            view.printError("No strategy found for: " + url);
+            return;
+        }
+
+        try {
+            view.printInfo("Analyzing: " + url);
+            view.printInfo("Using strategy: " + strategy.getClass().getSimpleName());
+            
+            Document doc = Jsoup.connect(url).get();
+            List<Article> articles = strategy.parse(url, doc);
+            
+            view.printSuccess("=== Analysis Statistics ===");
+            view.printSuccess("URL: " + url);
+            view.printSuccess("Strategy: " + strategy.getClass().getSimpleName());
+            view.printSuccess("Articles found: " + articles.size());
+            
+            if (!articles.isEmpty()) {
+                view.printSuccess("Sample titles:");
+                int count = Math.min(3, articles.size());
+                for (int i = 0; i < count; i++) {
+                    view.printSuccess("  - " + articles.get(i).getTitle());
+                }
+                if (articles.size() > 3) {
+                    view.printSuccess("  ... and " + (articles.size() - 3) + " more");
+                }
+            }
+            
+            view.printSuccess("Note: Articles were NOT stored in repository");
+            
+        } catch (Exception e) {
+            view.printError("Failed to analyze: " + e.getMessage());
+        }
+    }
+}

w10/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("Article list cannot be null");
+        }
+        for (Article article : articleList) {
+            if (article == null) {
+                throw new IllegalArgumentException("Article cannot be null");
+            }
+            articles.add(article);
+        }
+    }
+
+    public List<Article> getAll() {
+        return Collections.unmodifiableList(articles);
+    }
+
+    public int size() {
+        return articles.size();
+    }
+
+    public void clear() {
+        articles.clear();
+    }
+
+    public boolean isEmpty() {
+        return articles.isEmpty();
+    }
+}

w10/CrawlStrategy.java

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+package com.example.datacollect.strategy;
+
+import com.example.datacollect.model.Article;
+import org.jsoup.nodes.Document;
+import java.util.List;
+
+public interface CrawlStrategy {
+    List<Article> parse(String url, Document doc);
+    boolean supports(String url);
+    
+    default int getPriority() {
+        return 0;
+    }
+}