添加 w10 ArticleRepository 与 AnalyzeCommand 练习

w10/AnalyzeCommand.java

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+import java.util.List;
+
+interface ParseStrategy {
+    boolean supports(String url);
+    int analyze(String url);
+}
+
+class BlogStrategy implements ParseStrategy {
+    @Override
+    public boolean supports(String url) {
+        return url.contains("blog");
+    }
+
+    @Override
+    public int analyze(String url) {
+        return 1000;
+    }
+}
+
+class NewsStrategy implements ParseStrategy {
+    @Override
+    public boolean supports(String url) {
+        return url.contains("news");
+    }
+
+    @Override
+    public int analyze(String url) {
+        return 2000;
+    }
+}
+
+public class AnalyzeCommand {
+    private final List<ParseStrategy> strategies;
+
+    public AnalyzeCommand(List<ParseStrategy> strategies) {
+        this.strategies = strategies;
+    }
+
+    public void execute(String url) {
+        if (url == null || url.isBlank()) {
+            System.out.println("错误：URL不能为空");
+            return;
+        }
+
+        ParseStrategy matchedStrategy = null;
+        for (ParseStrategy strategy : strategies) {
+            if (strategy.supports(url)) {
+                matchedStrategy = strategy;
+                break;
+            }
+        }
+
+        if (matchedStrategy == null) {
+            System.out.println("错误：无支持该URL的解析策略");
+            return;
+        }
+
+        int stats = matchedStrategy.analyze(url);
+        System.out.println("=== 分析结果 ===");
+        System.out.println("URL: " + url);
+        System.out.println("统计信息: " + stats);
+    }
+
+    public static void main(String[] args) {
+        List<ParseStrategy> strategies = List.of(new BlogStrategy(), new NewsStrategy());
+        AnalyzeCommand cmd = new AnalyzeCommand(strategies);
+        cmd.execute("http://example.com/blog/123");
+    }
+}

w10/ArticleRepository.java

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+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.Objects;
+
+public class ArticleRepository {
+    private final List<Article> articles = new ArrayList<>();
+
+    public void add(Article article) {
+        if (article != null) {
+            articles.add(article);
+        }
+    }
+
+    public void addAll(Collection<Article> newArticles) {
+        if (newArticles == null || newArticles.isEmpty()) {
+            return;
+        }
+        for (Article article : newArticles) {
+            add(article);
+        }
+    }
+
+    public List<Article> getAll() {
+        return new ArrayList<>(articles);
+    }
+
+    public void clear() {
+        articles.clear();
+    }
+
+    static class Article {
+        private String title;
+        public Article(String title) { this.title = title; }
+        public String getTitle() { return title; }
+    }
+
+    public static void main(String[] args) {
+        ArticleRepository repo = new ArticleRepository();
+        System.out.println("=== 测试 ArticleRepository ===");
+        System.out.println("初始大小：" + repo.getAll().size());
+
+        repo.add(new Article("文章1"));
+        System.out.println("添加一个后大小：" + repo.getAll().size());
+
+        ArrayList<Article> list = new ArrayList<>();
+        list.add(new Article("文章2"));
+        list.add(null);
+        list.add(new Article("文章3"));
+        repo.addAll(list);
+        System.out.println("添加多个后大小：" + repo.getAll().size());
+
+        repo.addAll(null);
+        System.out.println("过滤null后大小：" + repo.getAll().size());
+    }
+}

w10/思考题.txt

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+两个策略都  supports  同一URL时怎么办？
+ 
+当多个策略都匹配同一URL时，会出现策略冲突，导致解析逻辑不确定。解决方案如下：
+ 
+1. 策略优先级排序：为每个策略设置明确的优先级（如数字权重），匹配时按优先级从高到低查找，优先使用优先级高的策略。
+​
+2. 匹配规则互斥设计：调整各策略的URL匹配规则，避免出现交叉匹配的情况，例如使用更精确的正则表达式，确保一个URL只被一个策略匹配。
+​
+3. 冲突处理机制：在代码中检测到多个匹配策略时，抛出异常并提示冲突，或让用户手动选择策略。
+​
+4. 策略注册顺序约定：若未设置优先级，按策略注册的先后顺序匹配，先注册的策略优先生效，但这种方式可读性较差，不推荐使用。