feat(user): 为收藏音乐页面添加更多操作功能

- 添加下拉菜单，支持多种操作
- 实现添加到播放列表、下一首播放、下载音乐、下载歌词等功能
- 优化用户交互，增加确认对话框和提示消息

music-houduan/src/main/java/com/test/musichouduan/controller/FileController.java

@@ -1,12 +1,27 @@
 package com.test.musichouduan.controller;
 
 import cn.dev33.satoken.annotation.SaCheckLogin;
+import com.test.musichouduan.entity.Music;
+import com.test.musichouduan.service.MusicService;
 import com.test.musichouduan.dto.Result;
 import com.test.musichouduan.service.FileService;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.core.io.InputStreamResource;
+import org.springframework.core.io.Resource;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
 import org.springframework.web.multipart.MultipartFile;
 
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.net.URLEncoder;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
 /**
  * 文件控制器
  */
@@ -16,7 +31,8 @@ public class FileController {
 
     @Autowired
     private FileService fileService;
-
+    @Autowired
+    private MusicService musicService;
     /**
      * 上传图片
      *
@@ -68,4 +84,73 @@ public class FileController {
         boolean result = fileService.deleteFile(url);
         return Result.success("删除成功", result);
     }
+
+    /**
+     * 下载音乐
+     *
+     * @param musicId 音乐ID
+     * @return 响应实体
+     */
+    @GetMapping("/download/music/{musicId}")
+    public ResponseEntity<Resource> downloadMusic(@PathVariable Integer musicId) throws IOException {
+        // 1. 根据 musicId 获取音乐信息
+        Music music = musicService.findMusicById(musicId);
+        if (music == null || music.getUrl() == null || music.getUrl().isEmpty()) {
+            return ResponseEntity.notFound().build();
+        }
+
+        // 2. 获取文件路径
+        String fileUrl = music.getUrl(); // 格式: /upload/musics/xxxxxxxx.mp3
+        String filePath = "music-houduan" + fileUrl; // 转换为相对项目路径
+        Path path = Paths.get(filePath);
+        Resource resource = new InputStreamResource(Files.newInputStream(path));
+
+        // 3. 设置响应头
+        HttpHeaders headers = new HttpHeaders();
+        String filename = music.getName() + ".mp3"; // 使用音乐名作为文件名
+        headers.add(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename*=UTF-8''" + URLEncoder.encode(filename, StandardCharsets.UTF_8.name()));
+        headers.add(HttpHeaders.CACHE_CONTROL, "no-cache, no-store, must-revalidate");
+        headers.add(HttpHeaders.PRAGMA, "no-cache");
+        headers.add(HttpHeaders.EXPIRES, "0");
+
+        return ResponseEntity.ok()
+                .headers(headers)
+                .contentLength(Files.size(path))
+                .contentType(MediaType.APPLICATION_OCTET_STREAM)
+                .body(resource);
+    }
+
+    /**
+     * 下载歌词
+     *
+     * @param musicId 音乐ID
+     * @return 响应实体
+     */
+    @GetMapping("/download/lyric/{musicId}")
+    public ResponseEntity<Resource> downloadLyric(@PathVariable Integer musicId) throws IOException {
+        // 1. 根据 musicId 获取音乐信息
+        Music music = musicService.findMusicById(musicId);
+        if (music == null || music.getLyric() == null || music.getLyric().isEmpty()) {
+            return ResponseEntity.notFound().build();
+        }
+
+        // 2. 将歌词文本转换为输入流
+        String lyricContent = music.getLyric();
+        byte[] lyricBytes = lyricContent.getBytes(StandardCharsets.UTF_8);
+        Resource resource = new InputStreamResource(new ByteArrayInputStream(lyricBytes));
+
+        // 3. 设置响应头
+        HttpHeaders headers = new HttpHeaders();
+        String filename = music.getName() + ".lrc"; // 使用音乐名作为文件名
+        headers.add(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename*=UTF-8''" + URLEncoder.encode(filename, StandardCharsets.UTF_8.name()));
+        headers.add(HttpHeaders.CACHE_CONTROL, "no-cache, no-store, must-revalidate");
+        headers.add(HttpHeaders.PRAGMA, "no-cache");
+        headers.add(HttpHeaders.EXPIRES, "0");
+
+        return ResponseEntity.ok()
+                .headers(headers)
+                .contentLength(lyricBytes.length)
+                .contentType(MediaType.TEXT_PLAIN)
+                .body(resource);
+    }
 }

music-houduan/src/main/java/com/test/musichouduan/service/MusicService.java

@@ -161,4 +161,12 @@ public interface MusicService {
      * @return 音乐状态DTO
      */
     MusicStatusDTO getMusicStatus(Long musicId, Long userId);
+
+    /**
+     * 根据ID查找音乐实体
+     *
+     * @param musicId 音乐ID
+     * @return 音乐实体
+     */
+    Music findMusicById(Integer musicId);
 }

music-houduan/src/main/java/com/test/musichouduan/service/impl/MusicServiceImpl.java

@@ -615,6 +615,11 @@ public class MusicServiceImpl implements MusicService {
         return new MusicStatusDTO(isCollected, isLiked);
     }
 
+    @Override
+    public Music findMusicById(Integer musicId) {
+        return musicRepository.findById(musicId.longValue()).orElse(null);
+    }
+
     /**
      * 将实体转换为DTO
      *