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视频断点续播功能实现方案

核心思路

实现视频断点续播需要前后端配合，主要包括：

1. 前端记录播放进度
2. 后端存储进度信息
3. 视频请求支持范围请求(Range Request)

前端实现

HTML结构

<div class="video-container"><video id="videoPlayer" controls><source src="/api/video/stream?videoId=123" type="video/mp4"></video><div class="video-controls"><span id="currentTime">00:00</span> / <span id="totalTime">00:00</span></div>
</div>

JavaScript实现

const videoPlayer = document.getElementById('videoPlayer');
const videoId = '123'; // 视频ID，实际应从URL或其他地方获取// 页面加载时获取上次播放进度
window.addEventListener('DOMContentLoaded', async () => {try {const response = await fetch(`/api/video/progress?videoId=${videoId}`);const data = await response.json();if (data.lastPosition) {videoPlayer.currentTime = data.lastPosition;}} catch (error) {console.error('获取播放进度失败:', error);}
});// 定期保存播放进度(每5秒)
let progressTimer = null;
videoPlayer.addEventListener('play', () => {progressTimer = setInterval(() => {saveVideoProgress(videoPlayer.currentTime);}, 5000);
});// 暂停和结束时保存进度
videoPlayer.addEventListener('pause', () => {clearInterval(progressTimer);saveVideoProgress(videoPlayer.currentTime);
});videoPlayer.addEventListener('ended', () => {clearInterval(progressTimer);saveVideoProgress(0); // 播放结束，重置进度
});// 保存播放进度到后端
async function saveVideoProgress(currentTime) {try {await fetch('/api/video/progress', {method: 'POST',headers: {'Content-Type': 'application/json'},body: JSON.stringify({videoId: videoId,position: currentTime})});} catch (error) {console.error('保存播放进度失败:', error);}
}

Spring Boot后端实现

1.依赖配置(pom.xml)

<dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-jpa</artifactId></dependency><dependency><groupId>com.h2database</groupId><artifactId>h2</artifactId><scope>runtime</scope></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency>
</dependencies>

2.实体类

@Entity
@Data
public class VideoProgress {@Id@GeneratedValue(strategy = GenerationType.IDENTITY)private Long id;private String userId;private String videoId;private Double position;private LocalDateTime updatedAt;@PrePersist@PreUpdatepublic void prePersist() {updatedAt = LocalDateTime.now();}
}

3.存储库接口

@Repository
public interface VideoProgressRepository extends JpaRepository<VideoProgress, Long> {Optional<VideoProgress> findByUserIdAndVideoId(String userId, String videoId);
}

4.服务层

@Service
@RequiredArgsConstructor
public class VideoService {private final VideoProgressRepository videoProgressRepository;public VideoProgress getVideoProgress(String userId, String videoId) {return videoProgressRepository.findByUserIdAndVideoId(userId, videoId).orElse(new VideoProgress()<