实时弹幕系统深度解析：为什么蜻蜓z企业级解决方案值5万？优雅草卓伊凡

// 服务端时间同步协议
@GetMapping("/sync")
public Response<SyncData> getSyncData(
    @RequestParam long videoId,
    @RequestParam long clientTime) {

    long serverTime = System.currentTimeMillis();
    long videoPosition = getVideoPosition(videoId);

    return Response.success(
        new SyncData(serverTime, clientTime, videoPosition)
    );
}

// 基于Netty的WebSocket优化
public class DanmuWebSocketHandler extends SimpleChannelInboundHandler<TextWebSocketFrame> {

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, TextWebSocketFrame frame) {
        // 1. 协议压缩：将JSON转为自定义二进制格式
        byte[] compressed = DanmuProtocol.compress(frame.text());

        // 2. 批量发送：每50ms聚合一次消息
        DanmuQueue.add(ctx.channel(), compressed);
    }
}

{
  "id": "dm_893742",
  "content": "这个镜头绝了！",
  "time": 1256.78,
  "color": "#FF5F15",
  "role": "vip",
  "likes": 42,
  "author": "user_3847"
}

// Flutter端渲染逻辑
CustomPaint(
  painter: DanmuPainter(
    items: _danmus,
    videoPosition: _player.position,
    // GPU加速渲染
    useHardwareAcceleration: true,
  ),
)

src/
├── controller/
│   ├── DanmuController.java # 弹幕API入口
│   └── SyncController.java  # 时间同步服务
├── service/
│   ├── DanmuDistribution.java # 分布式分发
│   └── LikeService.java      # 点赞统计
└── config/
    ├── WebSocketConfig.java  # Netty配置
    └── RedisPubSub.java      # 实时广播