上传文件至 'project/command'

project/command/HelpCommand.java

@@ -0,0 +1,33 @@
+package com.example.moviecli.command;
+
+import com.example.moviecli.repository.MovieRepository;
+import com.example.moviecli.view.ConsoleView;
+
+public class HelpCommand implements Command {
+    private final ConsoleView view;
+
+    public HelpCommand(ConsoleView view) {
+        this.view = view;
+    }
+
+    @Override
+    public String getName() {
+        return "help";
+    }
+
+    @Override
+    public void execute(String[] args, MovieRepository repository) {
+        view.printInfo("可用命令：");
+        view.printInfo("  crawl <url>   - 爬取指定网站的数据");
+        view.printInfo("  list          - 列出所有记录");
+        view.printInfo("  search <词>   - 按标题搜索");
+        view.printInfo("  stat          - 统计评分分布");
+        view.printInfo("  export        - 导出为 movies.csv");
+        view.printInfo("  help          - 显示本帮助");
+        view.printInfo("  exit          - 退出程序");
+        view.printInfo("\n支持的 URL 示例：");
+        view.printInfo("  https://movie.douban.com/top250");
+        view.printInfo("  https://news.sina.com.cn/");
+        view.printInfo("  https://book.douban.com/top250");
+    }
+}

project/command/ListCommand.java

@@ -0,0 +1,29 @@
+package com.example.moviecli.command;
+
+import com.example.moviecli.repository.MovieRepository;
+import com.example.moviecli.view.ConsoleView;
+import com.example.moviecli.model.Movie;
+public class ListCommand implements Command {
+    private final ConsoleView view;
+
+    public ListCommand(ConsoleView view) {
+        this.view = view;
+    }
+
+    @Override
+    public String getName() {
+        return "list";
+    }
+
+    @Override
+    public void execute(String[] args, MovieRepository repository) {
+        var movies = repository.getAll();
+        if (movies.isEmpty()) {
+            view.printInfo("暂无数据，请先执行 crawl <url>。");
+            return;
+        }
+        for (Movie m : movies) {
+            System.out.println(m.getRank() + ". " + m.getTitle() + " - " + m.getScore());
+        }
+    }
+}

project/command/SearchCommand.java

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+package com.example.moviecli.command;
+
+import com.example.moviecli.model.Movie;
+import com.example.moviecli.repository.MovieRepository;
+import com.example.moviecli.view.ConsoleView;
+
+public class SearchCommand implements Command {
+    private final ConsoleView view;
+
+    public SearchCommand(ConsoleView view) {
+        this.view = view;
+    }
+
+    @Override
+    public String getName() {
+        return "search";
+    }
+
+    @Override
+    public void execute(String[] args, MovieRepository repository) {
+        if (args.length < 2) {
+            view.printError("用法: search <关键词>");
+            return;
+        }
+        String keyword = args[1].toLowerCase();
+        var result = repository.getAll().stream()
+                .filter(m -> m.getTitle().toLowerCase().contains(keyword))
+                .toList();
+        if (result.isEmpty()) {
+            view.printInfo("没有找到包含 \"" + keyword + "\" 的记录。");
+        } else {
+            result.forEach(m -> System.out.println(m.getRank() + ". " + m.getTitle() + " - " + m.getScore()));
+        }
+    }
+}

project/command/StatCommand.java

@@ -0,0 +1,33 @@
+package com.example.moviecli.command;
+
+import com.example.moviecli.repository.MovieRepository;
+import com.example.moviecli.view.ConsoleView;
+import java.util.Map;
+import java.util.stream.Collectors;
+import com.example.moviecli.model.Movie;
+public class StatCommand implements Command {
+    private final ConsoleView view;
+
+    public StatCommand(ConsoleView view) {
+        this.view = view;
+    }
+
+    @Override
+    public String getName() {
+        return "stat";
+    }
+
+    @Override
+    public void execute(String[] args, MovieRepository repository) {
+        var movies = repository.getAll();
+        if (movies.isEmpty()) {
+            view.printInfo("无数据，请先 crawl。");
+            return;
+        }
+        Map<String, Long> scoreCount = movies.stream()
+                .collect(Collectors.groupingBy(Movie::getScore, Collectors.counting()));
+        view.printInfo("评分分布：");
+        scoreCount.forEach((score, count) -> 
+            System.out.println(score + " 分 -> " + count + " 条"));
+    }
+}