strategy W10

java-cli(1)/java-cli/src/main/java/com/example/datacollect/Main.java

@@ -1,19 +1,17 @@
 package com.example.datacollect;
 
 import com.example.datacollect.controller.CrawlerController;
-import com.example.datacollect.model.Article;
+import com.example.datacollect.repository.ArticleRepository;
 import com.example.datacollect.view.ConsoleView;
-import java.util.ArrayList;
-import java.util.List;
 
 public class Main {
 
     public static void main(String[] args) {
         ConsoleView view = new ConsoleView();
-        List<Article> articles = new ArrayList<>();
-        CrawlerController controller = new CrawlerController(view, articles);
+        ArticleRepository repository = new ArticleRepository();
+        CrawlerController controller = new CrawlerController(view, repository);
 
-        view.printSuccess("Welcome to CLI Crawler (w9_1)! Type help for commands.");
+        view.printSuccess("Welcome to CLI Crawler (w10)! Type help for commands.");
         while (true) {
             controller.handle(view.readLine());
         }

java-cli(1)/java-cli/src/main/java/com/example/datacollect/command/Command.java

@@ -1,9 +1,8 @@
 package com.example.datacollect.command;
 
-import com.example.datacollect.model.Article;
-import java.util.List;
+import com.example.datacollect.repository.ArticleRepository;
 
 public interface Command {
     String getName();
-    void execute(String[] args, List<Article> articles);
+    void execute(String[] args, ArticleRepository repository);
 }

java-cli(1)/java-cli/src/main/java/com/example/datacollect/command/CrawlCommand.java

@@ -1,14 +1,20 @@
 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 java.util.List;
 
 public class CrawlCommand implements Command {
     private final ConsoleView view;
+    private final StrategyFactory strategyFactory;
 
-    public CrawlCommand(ConsoleView view) {
+    public CrawlCommand(ConsoleView view, StrategyFactory strategyFactory) {
         this.view = view;
+        this.strategyFactory = strategyFactory;
     }
 
     @Override
@@ -17,11 +23,20 @@ public class CrawlCommand implements Command {
     }
 
     @Override
-    public void execute(String[] args, List<Article> articles) {
+    public void execute(String[] args, ArticleRepository repository) {
         if (args.length < 2) {
             view.printError("Usage: crawl <url>");
             return;
         }
-        view.printInfo("Stub: would crawl " + args[1]);
+
+        String url = args[1];
+        CrawlStrategy strategy = strategyFactory.getStrategy(url);
+        
+        view.printInfo("Crawling " + url + " using " + strategy.getName() + " strategy...");
+        
+        List<Article> articles = strategy.crawl(url);
+        repository.addAll(articles);
+        
+        view.printSuccess("Crawl completed! Added " + articles.size() + " articles.");
     }
 }

java-cli(1)/java-cli/src/main/java/com/example/datacollect/command/ExitCommand.java

@@ -1,8 +1,7 @@
 package com.example.datacollect.command;
 
-import com.example.datacollect.model.Article;
+import com.example.datacollect.repository.ArticleRepository;
 import com.example.datacollect.view.ConsoleView;
-import java.util.List;
 
 public class ExitCommand implements Command {
     private final ConsoleView view;
@@ -17,7 +16,7 @@ public class ExitCommand implements Command {
     }
 
     @Override
-    public void execute(String[] args, List<Article> articles) {
+    public void execute(String[] args, ArticleRepository repository) {
         view.printSuccess("Bye!");
         System.exit(0);
     }

java-cli(1)/java-cli/src/main/java/com/example/datacollect/command/HelpCommand.java

@@ -1,8 +1,7 @@
 package com.example.datacollect.command;
 
-import com.example.datacollect.model.Article;
+import com.example.datacollect.repository.ArticleRepository;
 import com.example.datacollect.view.ConsoleView;
-import java.util.List;
 
 public class HelpCommand implements Command {
     private final ConsoleView view;
@@ -17,7 +16,7 @@ public class HelpCommand implements Command {
     }
 
     @Override
-    public void execute(String[] args, List<Article> articles) {
+    public void execute(String[] args, ArticleRepository repository) {
         view.printInfo("Commands: crawl <url>, list, history, help, exit");
     }
 }

java-cli(1)/java-cli/src/main/java/com/example/datacollect/command/HistoryCommand.java

@@ -1,9 +1,10 @@
 package com.example.datacollect.command;
 
-import com.example.datacollect.model.Article;
-import com.example.datacollect.view.ConsoleView;
 import java.util.List;
 
+import com.example.datacollect.repository.ArticleRepository;
+import com.example.datacollect.view.ConsoleView;
+
 public class HistoryCommand implements Command {
     private final ConsoleView view;
     private final List<String> history;
@@ -19,7 +20,7 @@ public class HistoryCommand implements Command {
     }
 
     @Override
-    public void execute(String[] args, List<Article> articles) {
+    public void execute(String[] args, ArticleRepository repository) {
         if (history.isEmpty()) {
             view.printInfo("暂无命令历史");
             return;

java-cli(1)/java-cli/src/main/java/com/example/datacollect/command/ListCommand.java

@@ -1,7 +1,9 @@
 package com.example.datacollect.command;
 
 import com.example.datacollect.model.Article;
+import com.example.datacollect.repository.ArticleRepository;
 import com.example.datacollect.view.ConsoleView;
+
 import java.util.List;
 
 public class ListCommand implements Command {
@@ -17,7 +19,15 @@ public class ListCommand implements Command {
     }
 
     @Override
-    public void execute(String[] args, List<Article> articles) {
-        view.display(articles);
+    public void execute(String[] args, ArticleRepository repository) {
+        List<Article> articles = repository.getAll();
+        if (articles.isEmpty()) {
+            view.printInfo("暂无文章，请先执行 crawl。");
+            return;
+        }
+        for (int i = 0; i < articles.size(); i++) {
+            Article a = articles.get(i);
+            System.out.println((i + 1) + ". " + a.getTitle() + " | " + a.getUrl() + " | " + a.getAuthor() + " | " + a.getPublishDate());
+        }
     }
 }

java-cli(1)/java-cli/src/main/java/com/example/datacollect/controller/CrawlerController.java

@@ -1,33 +1,36 @@
 package com.example.datacollect.controller;
 
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-
 import com.example.datacollect.command.Command;
 import com.example.datacollect.command.CrawlCommand;
 import com.example.datacollect.command.ExitCommand;
 import com.example.datacollect.command.HelpCommand;
 import com.example.datacollect.command.HistoryCommand;
 import com.example.datacollect.command.ListCommand;
-import com.example.datacollect.model.Article;
+import com.example.datacollect.repository.ArticleRepository;
+import com.example.datacollect.strategy.StrategyFactory;
 import com.example.datacollect.view.ConsoleView;
 
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
 public class CrawlerController {
     private final Map<String, Command> commands = new HashMap<>();
     private final ConsoleView view;
-    private final List<Article> articles;
+    private final ArticleRepository repository;
     private final List<String> history = new ArrayList<>();
     private HistoryCommand historyCommand;
 
-    public CrawlerController(ConsoleView view, List<Article> articles) {
+    public CrawlerController(ConsoleView view, ArticleRepository repository) {
         this.view = view;
-        this.articles = articles;
+        this.repository = repository;
+        StrategyFactory strategyFactory = new StrategyFactory();
+        
         historyCommand = new HistoryCommand(view, history);
         register(new HelpCommand(view));
         register(new ListCommand(view));
-        register(new CrawlCommand(view));
+        register(new CrawlCommand(view, strategyFactory));
         register(new ExitCommand(view));
         register(historyCommand);
     }
@@ -51,6 +54,6 @@ public class CrawlerController {
             view.printError("Unknown command: " + cmdName);
             return;
         }
-        command.execute(args, articles);
+        command.execute(args, repository);
     }
 }

java-cli(1)/java-cli/src/main/java/com/example/datacollect/repository/ArticleRepository.java

@@ -0,0 +1,42 @@
+package com.example.datacollect.repository;
+
+import com.example.datacollect.model.Article;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Optional;
+
+public class ArticleRepository {
+    private final List<Article> articles = new ArrayList<>();
+
+    public void add(Article article) {
+        if (article != null) {
+            articles.add(article);
+        }
+    }
+
+    public void addAll(List<Article> newArticles) {
+        if (newArticles != null && !newArticles.isEmpty()) {
+            articles.addAll(newArticles);
+        }
+    }
+
+    public List<Article> getAll() {
+        return Collections.unmodifiableList(articles);
+    }
+
+    public Optional<Article> findByTitle(String title) {
+        return articles.stream()
+                .filter(a -> a.getTitle().equals(title))
+                .findFirst();
+    }
+
+    public int count() {
+        return articles.size();
+    }
+
+    public void clear() {
+        articles.clear();
+    }
+}

java-cli(1)/java-cli/src/main/java/com/example/datacollect/strategy/CrawlStrategy.java

@@ -0,0 +1,10 @@
+package com.example.datacollect.strategy;
+
+import com.example.datacollect.model.Article;
+
+import java.util.List;
+
+public interface CrawlStrategy {
+    String getName();
+    List<Article> crawl(String url);
+}

java-cli(1)/java-cli/src/main/java/com/example/datacollect/strategy/MockStrategy.java

@@ -0,0 +1,22 @@
+package com.example.datacollect.strategy;
+
+import com.example.datacollect.model.Article;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class MockStrategy implements CrawlStrategy {
+
+    @Override
+    public String getName() {
+        return "mock";
+    }
+
+    @Override
+    public List<Article> crawl(String url) {
+        List<Article> articles = new ArrayList<>();
+        articles.add(new Article("Mock Article 1", url, "Mock content 1", "Mock Author", "2024-01-01"));
+        articles.add(new Article("Mock Article 2", url, "Mock content 2", "Mock Author", "2024-01-02"));
+        return articles;
+    }
+}

java-cli(1)/java-cli/src/main/java/com/example/datacollect/strategy/SimpleStrategy.java

@@ -0,0 +1,43 @@
+package com.example.datacollect.strategy;
+
+import com.example.datacollect.model.Article;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class SimpleStrategy implements CrawlStrategy {
+
+    @Override
+    public String getName() {
+        return "simple";
+    }
+
+    @Override
+    public List<Article> crawl(String url) {
+        List<Article> articles = new ArrayList<>();
+        String siteName = extractSiteName(url);
+        articles.add(new Article("Simple Article from " + siteName, url, "Simple content extracted from " + url,
+                "Anonymous", java.time.LocalDate.now().toString()));
+        articles.add(new Article("Another Article from " + siteName, url, "More content from " + url,
+                "Unknown", java.time.LocalDate.now().toString()));
+        articles.add(new Article("Latest News from " + siteName, url, "Breaking news content",
+                "Editor", java.time.LocalDate.now().toString()));
+        return articles;
+    }
+
+    private String extractSiteName(String url) {
+        try {
+            if (url.startsWith("http://") || url.startsWith("https://")) {
+                int start = url.indexOf("://") + 3;
+                int end = url.indexOf('/', start);
+                if (end > start) {
+                    return url.substring(start, end);
+                }
+                return url.substring(start);
+            }
+            return url;
+        } catch (Exception e) {
+            return url;
+        }
+    }
+}

java-cli(1)/java-cli/src/main/java/com/example/datacollect/strategy/StrategyFactory.java

@@ -0,0 +1,41 @@
+package com.example.datacollect.strategy;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class StrategyFactory {
+    private final Map<String, CrawlStrategy> strategies = new HashMap<>();
+
+    public StrategyFactory() {
+        register(new MockStrategy());
+        register(new SimpleStrategy());
+    }
+
+    public void register(CrawlStrategy strategy) {
+        strategies.put(strategy.getName().toLowerCase(), strategy);
+    }
+
+    public CrawlStrategy getStrategy(String url) {
+        if (url == null || url.isEmpty()) {
+            return strategies.get("mock");
+        }
+
+        if (url.toLowerCase().contains("mock")) {
+            return strategies.get("mock");
+        }
+
+        if (url.toLowerCase().contains("simple")) {
+            return strategies.get("simple");
+        }
+
+        if (url.startsWith("http://") || url.startsWith("https://")) {
+            return strategies.get("simple");
+        }
+
+        return strategies.get("mock");
+    }
+
+    public CrawlStrategy getStrategyByName(String name) {
+        return strategies.get(name.toLowerCase());
+    }
+}