实验三

实验三/AnimatedMovie.java

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+public class AnimatedMovie extends Movie {
+    private String studio;
+
+    public AnimatedMovie(String title, int year, double rating, String genre, String studio) {
+        super(title, year, rating, genre);
+        this.studio = studio;
+    }
+
+    @Override
+    public void play() {
+        System.out.println("动画电影播放：" + getTitle() + "，制作公司：" + studio);
+    }
+}

实验三/BaseMovieCrawler.java

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+import org.jsoup.nodes.Element;
+import java.util.List;
+
+public abstract class BaseMovieCrawler implements MovieCrawlerInterface {
+    public abstract List<Movie> crawl(int limit);
+    protected abstract Movie parseMovie(Element element);
+}

实验三/Movie.java

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+public abstract class Movie implements MoviePlayable {
+    private String title;
+    private int year;
+    private double rating;
+    private String genre;
+
+    public Movie(String title, int year, double rating, String genre) {
+        this.title = title;
+        this.year = year;
+        this.rating = rating;
+        this.genre = genre;
+    }
+
+    // 接口方法，留给子类实现
+    @Override
+    public abstract void play();
+
+    // getter
+    public String getTitle() { return title; }
+    public int getYear() { return year; }
+    public double getRating() { return rating; }
+    public String getGenre() { return genre; }
+}

实验三/MovieCrawler.java

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+import org.jsoup.Jsoup;
+import org.jsoup.nodes.Document;
+import org.jsoup.nodes.Element;
+import org.jsoup.select.Elements;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class MovieCrawler extends BaseMovieCrawler {
+
+    private static final String URL = "https://movie.douban.com/top250?start=0";
+
+    @Override
+    public List<Movie> crawl(int limit) {
+        List<Movie> movies = new ArrayList<>();
+        try {
+            Document doc = Jsoup.connect(URL)
+                    .userAgent("Mozilla/5.0")
+                    .timeout(10000)
+                    .get();
+
+            Elements items = doc.select(".item");
+            int count = 0;
+
+            for (Element item : items) {
+                if (count >= limit) break;
+
+                Movie movie = parseMovie(item);
+                if (movie != null) {
+                    movies.add(movie);
+                    count++;
+                }
+            }
+        } catch (Exception e) {
+            System.out.println("模拟电影数据（因网络403）");
+            for (int i = 0; i < limit; i++) {
+                if (i % 2 == 0) {
+                    movies.add(new TheatreMovie("肖申克的救赎 " + i, 1994, 9.7, "剧情", 49.9));
+                } else {
+                    movies.add(new AnimatedMovie("哪吒之魔童降世 " + i, 2019, 8.4, "动画", "可可豆"));
+                }
+            }
+        }
+        return movies;
+    }
+
+    @Override
+    protected Movie parseMovie(Element element) {
+        try {
+            String title = element.select(".hd .title").first().text();
+            String info = element.select(".bd p").first().text();
+            Matcher m = Pattern.compile("(\\d{4})").matcher(info);
+            int year = m.find() ? Integer.parseInt(m.group(1)) : 2023;
+            double rating = Double.parseDouble(element.select(".rating_num").first().text());
+            String genre = info.contains("/") ? info.split("/")[2].trim() : "未知";
+
+            return new TheatreMovie(title, year, rating, genre, 59.9);
+        } catch (Exception e) {
+            return null;
+        }
+    }
+}

实验三/MovieCrawlerInterface.java

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+import java.util.List;
+
+public interface MovieCrawlerInterface {
+    List<Movie> crawl(int limit);
+}

实验三/MoviePlayable.java

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+public interface MoviePlayable {
+    void play();
+}

实验三/Test.java

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+import java.util.List;
+
+public class Test {
+    public static void main(String[] args) {
+        // 接口指向实现类 → 多态
+        MovieCrawlerInterface crawler = new MovieCrawler();
+        List<Movie> movies = crawler.crawl(5);
+
+        System.out.println("\n==== 播放电影 ====");
+        for (Movie movie : movies) {
+            movie.play();
+        }
+    }
+}

实验三/TheatreMovie.java

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+public class TheatreMovie extends Movie {
+    private double price;
+
+    public TheatreMovie(String title, int year, double rating, String genre, double price) {
+        super(title, year, rating, genre);
+        this.price = price;
+    }
+
+    @Override
+    public void play() {
+        System.out.println("院线电影播放：" + getTitle() + "，票价：" + price);
+    }
+}