上传文件至 'W5'

package w5;

// 基础题：Shape类及其子类
abstract class Shape {
    public abstract void draw();
}

class Circle extends Shape {
    private double r;

    public Circle(double r) {
        this.r = r;
    }

    @Override
    public void draw() {
        System.out.println("绘制圆形，半径：" + r);
    }
}

class Rectangle extends Shape {
    private double width;
    private double height;

    public Rectangle(double width, double height) {
        this.width = width;
        this.height = height;
    }

    @Override
    public void draw() {
        System.out.println("绘制矩形，宽：" + width + "，高：" + height);
    }
}

// 工具类
class ShapeUtil {
    public static void drawShape(Shape s) {
        s.draw();
    }
}

// 主类
public class PolymorphismDemo {
    public static void main(String[] args) {
        System.out.println("=== 基础题测试 ===");
        // 测试Shape类
        Shape circle = new Circle(5);
        Shape rectangle = new Rectangle(4, 6);

        ShapeUtil.drawShape(circle);
        ShapeUtil.drawShape(rectangle);
    }
}

W5/NeteaseCommentCrawler.java

@@ -0,0 +1,148 @@
+package com.example;
+
+import com.alibaba.fastjson.JSON;
+import com.alibaba.fastjson.JSONArray;
+import com.alibaba.fastjson.JSONObject;
+
+import java.io.*;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.net.URLEncoder;
+import java.nio.charset.StandardCharsets;
+
+public class NeteaseCommentCrawler {
+    private static final String USER_AGENT = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36";
+
+    public static JSONArray getHotComments(String songId) {
+        String apiUrl = "https://music.163.com/api/v1/resource/comments/R_SO_4_" + songId
+                + "?rid=R_SO_4_" + songId
+                + "&offset=0&total=true&limit=20";
+
+        try {
+            System.out.println("正在请求网易云音乐评论接口...");
+
+            URL url = new URL(apiUrl);
+            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
+            conn.setRequestMethod("GET");
+            conn.setConnectTimeout(15000);
+            conn.setReadTimeout(15000);
+            conn.setRequestProperty("User-Agent", USER_AGENT);
+            conn.setRequestProperty("Referer", "https://music.163.com/song?id=" + songId);
+            conn.setRequestProperty("Accept", "*/*");
+            conn.setRequestProperty("Accept-Language", "zh-CN,zh;q=0.9,en;q=0.8");
+
+            int statusCode = conn.getResponseCode();
+            System.out.println("HTTP状态码：" + statusCode);
+
+            if (statusCode != 200) {
+                System.err.println("请求失败，HTTP状态码：" + statusCode);
+                return new JSONArray();
+            }
+
+            String responseStr = readStream(conn.getInputStream());
+            System.out.println("响应长度：" + responseStr.length() + " 字符");
+
+            if (responseStr == null || responseStr.trim().isEmpty()) {
+                System.err.println("响应内容为空");
+                return new JSONArray();
+            }
+
+            JSONObject responseJson = JSON.parseObject(responseStr);
+
+            if (responseJson == null) {
+                System.err.println("JSON解析失败");
+                return new JSONArray();
+            }
+
+            int code = responseJson.getIntValue("code");
+            if (code != 200) {
+                System.err.println("接口返回错误码：" + code + "，消息：" + responseJson.getString("message"));
+                return new JSONArray();
+            }
+
+            JSONArray hotComments = responseJson.getJSONArray("hotComments");
+            if (hotComments == null || hotComments.isEmpty()) {
+                System.out.println("该歌曲暂无热门评论");
+                return new JSONArray();
+            }
+
+            return hotComments;
+
+        } catch (Exception e) {
+            System.err.println("爬取失败：" + e.getMessage());
+            e.printStackTrace();
+        }
+        return new JSONArray();
+    }
+
+    private static String readStream(InputStream is) throws IOException {
+        BufferedReader reader = new BufferedReader(new InputStreamReader(is, StandardCharsets.UTF_8));
+        StringBuilder sb = new StringBuilder();
+        String line;
+        while ((line = reader.readLine()) != null) {
+            sb.append(line);
+        }
+        return sb.toString();
+    }
+
+    public static void printComments(JSONArray hotComments) {
+        System.out.println("\n===== 网易云音乐热门评论 =====");
+        System.out.println("共获取到 " + hotComments.size() + " 条热门评论\n");
+        for (int i = 0; i < hotComments.size(); i++) {
+            JSONObject comment = hotComments.getJSONObject(i);
+            JSONObject user = comment.getJSONObject("user");
+            String nickname = user.getString("nickname");
+            String content = comment.getString("content").replace("\n", " ");
+            int likedCount = comment.getInteger("likedCount");
+            Long time = comment.getLong("time");
+            String timeStr = formatTime(time);
+
+            System.out.printf("%d. [%s]：%s（%d赞）%s%n",
+                    i + 1, nickname, content, likedCount, timeStr);
+        }
+    }
+
+    private static String formatTime(Long timestamp) {
+        if (timestamp == null) return "";
+        java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+        return sdf.format(new java.util.Date(timestamp));
+    }
+
+    public static void saveToCSV(JSONArray hotComments) {
+        String filePath = "netease_hot_comments.csv";
+        try (FileWriter writer = new FileWriter(filePath, StandardCharsets.UTF_8)) {
+            writer.write("序号,用户,评论,点赞数,时间\n");
+            for (int i = 0; i < hotComments.size(); i++) {
+                JSONObject comment = hotComments.getJSONObject(i);
+                JSONObject user = comment.getJSONObject("user");
+                String nickname = user.getString("nickname");
+                String content = comment.getString("content").replace("\n", " ").replace(",", "，");
+                int likedCount = comment.getInteger("likedCount");
+                Long time = comment.getLong("time");
+                String timeStr = formatTime(time);
+
+                writer.write(String.format("%d,%s,%s,%d,%s%n",
+                        i + 1, nickname, content, likedCount, timeStr));
+            }
+            System.out.println("\n评论已保存到 " + filePath);
+        } catch (Exception e) {
+            System.err.println("保存CSV失败：" + e.getMessage());
+        }
+    }
+
+    public static void main(String[] args) {
+        String songId = "186016";
+        System.out.println("歌曲ID：" + songId + "（周杰伦 - 晴天）");
+        System.out.println("================================");
+
+        JSONArray hotComments = getHotComments(songId);
+        if (!hotComments.isEmpty()) {
+            printComments(hotComments);
+            saveToCSV(hotComments);
+        } else {
+            System.out.println("未获取到评论，请检查：");
+            System.out.println("  1. 歌曲ID是否正确");
+            System.out.println("  2. 网络是否能访问 music.163.com");
+        }
+    }
+}