提交继承+多态+接口爬虫作业

继承+多态+接口爬虫/CrawlerMain.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;
+
+// ==================== 接口 ====================
+interface Crawler {
+    List<?> startCrawl();
+}
+
+// ==================== 抽象爬虫父类 ====================
+abstract class BaseCrawler implements Crawler {
+    protected String baseUrl;
+
+    public BaseCrawler(String baseUrl) {
+        this.baseUrl = baseUrl;
+    }
+
+    protected Document getPage(String url) throws Exception {
+        return Jsoup.connect(url)
+                .userAgent("Mozilla/5.0 (Windows NT 10.0; Win64; x64)")
+                .timeout(15000)
+                .get();
+    }
+}
+
+// ==================== 实体类 ====================
+class Movie {
+    private String title;
+    private String rating;
+
+    public Movie(String title, String rating) {
+        this.title = title;
+        this.rating = rating;
+    }
+
+    public String toString() {
+        return "电影：《" + title + "》 | 评分：" + rating;
+    }
+}
+
+class Hero {
+    private String name;
+
+    public Hero(String name) {
+        this.name = name;
+    }
+
+    public String toString() {
+        return "英雄：" + name;
+    }
+}
+
+class Weather {
+    private String province;
+    private String city;
+    private String temperature;
+    private String condition;
+
+    public Weather(String province, String city, String temperature, String condition) {
+        this.province = province;
+        this.city = city;
+        this.temperature = temperature;
+        this.condition = condition;
+    }
+
+    public String toString() {
+        return "省份：" + province + " | 城市：" + city + " | 天气：" + condition + " | 温度：" + temperature;
+    }
+}
+
+// ==================== 豆瓣电影爬虫 ====================
+class MovieCrawler extends BaseCrawler {
+
+    public MovieCrawler() {
+        super("https://movie.douban.com/top250");
+    }
+
+    @Override
+    public List<Movie> startCrawl() {
+        List<Movie> list = new ArrayList<>();
+        try {
+            for (int i = 0; i < 250; i += 25) {
+                Document doc = getPage(baseUrl + "?start=" + i);
+                Elements items = doc.select(".item");
+
+                for (Element e : items) {
+                    String title = e.select(".title").first().text().split("/")[0].trim();
+                    String rating = e.select(".rating_num").text();
+                    list.add(new Movie(title, rating));
+                }
+
+                Thread.sleep(1000);
+            }
+        } catch (Exception e) {
+            System.out.println("电影爬取失败");
+        }
+        return list;
+    }
+}
+
+// ==================== 王者荣耀爬虫 ====================
+class HeroCrawler extends BaseCrawler {
+
+    public HeroCrawler() {
+        super("https://pvp.qq.com/web201605/herolist.shtml");
+    }
+
+    @Override
+    public List<Hero> startCrawl() {
+        List<Hero> list = new ArrayList<>();
+        try {
+            Document doc = getPage(baseUrl);
+            Elements heros = doc.select("ul.herolist li a");
+
+            for (Element h : heros) {
+                String name = h.text().trim();
+                if (!name.isEmpty()) {
+                    list.add(new Hero(name));
+                }
+            }
+        } catch (Exception e) {
+            System.out.println("英雄爬取失败");
+        }
+        return list;
+    }
+}
+
+// ==================== 天气爬虫（全国城市） ====================
+class WeatherCrawler extends BaseCrawler {
+
+    private static final String[][] cities = {
+            {"北京","北京","101010100"},{"上海","上海","101020100"},{"天津","天津","101030100"},{"重庆","重庆","101040100"},
+            {"河北","石家庄","101090101"},{"山西","太原","101100101"},{"辽宁","沈阳","101070101"},{"吉林","长春","101060101"},
+            {"黑龙江","哈尔滨","101050101"},{"江苏","南京","101190101"},{"浙江","杭州","101210101"},{"安徽","合肥","101220101"},
+            {"福建","福州","101230101"},{"江西","南昌","101240101"},{"山东","济南","101120101"},{"河南","郑州","101180101"},
+            {"湖北","武汉","101200101"},{"湖南","长沙","101250101"},{"广东","广州","101280101"},{"海南","海口","101310101"},
+            {"四川","成都","101270101"},{"贵州","贵阳","101260101"},{"云南","昆明","101290101"},{"陕西","西安","101110101"},
+            {"甘肃","兰州","101160101"},{"青海","西宁","101150101"},{"内蒙古","呼和浩特","101080101"},{"广西","南宁","101300101"},
+            {"西藏","拉萨","101140101"},{"宁夏","银川","101170101"},{"新疆","乌鲁木齐","101130101"},
+            {"香港","香港","101320101"},{"澳门","澳门","101330101"},{"台湾","台北","101340101"}
+    };
+
+    public WeatherCrawler() {
+        super("https://www.weather.com.cn/weather/");
+    }
+
+    @Override
+    public List<Weather> startCrawl() {
+        List<Weather> list = new ArrayList<>();
+        try {
+            for (String[] city : cities) {
+
+                String province = city[0];
+                String cityName = city[1];
+                String code = city[2];
+
+                Document doc = getPage(baseUrl + code + ".shtml");
+                Element today = doc.select("ul.t li").first();
+
+                if (today != null) {
+                    String temp = today.select(".tem").text();
+                    String wea = today.select(".wea").text();
+                    list.add(new Weather(province, cityName, temp, wea));
+                }
+
+                Thread.sleep(500);
+            }
+        } catch (Exception e) {
+            System.out.println("天气爬取失败");
+        }
+        return list;
+    }
+}
+
+// ==================== 主程序 ====================
+public class CrawlerMain {
+    public static void main(String[] args) {
+
+        // 用接口体现多态（老师重点）
+        Crawler m = new MovieCrawler();
+        Crawler h = new HeroCrawler();
+        Crawler w = new WeatherCrawler();
+
+        // 电影
+        System.out.println("===== 豆瓣电影Top250 =====");
+        for (Object obj : m.startCrawl()) {
+            System.out.println(obj);
+        }
+
+        // 英雄
+        System.out.println("\n===== 王者荣耀全英雄 =====");
+        List<?> heroes = h.startCrawl();
+        for (Object obj : heroes) {
+            System.out.println(obj);
+        }
+        System.out.println("共爬取 " + heroes.size() + " 个英雄");
+
+        // 天气
+        System.out.println("\n===== 全国各省天气 =====");
+        for (Object obj : w.startCrawl()) {
+            System.out.println(obj);
+        }
+    }
+}