Question

我正在学习netty网络套接字。这是我的websocket处理程序的一部分

@Override
public void channelRead (ChannelHandlerContext ctx, Object msg) throws IOException, MkvElementVisitException{
    if (msg instanceof WebSocketFrame) {
        if (msg instanceof BinaryWebSocketFrame) {
            System.out.println(messageIndex);
            messageIndex++;
            // transfer WebSocketFrame to bytebuffer

            ByteBuf temp = ((BinaryWebSocketFrame)msg).content();
            int readable = temp.readableBytes();

            System.out.print(" readable bytes of message");
            System.out.println(temp.readableBytes());

            ByteBuffer buf = ByteBuffer.allocate(temp.readableBytes());
            temp.readBytes(buf);
            buf.flip();
            System.out.print("buffer position:");
            System.out.println(buf.position());
            System.out.print("buffer limit:");
            System.out.println(buf.limit());
            System.out.print("buffer capacity:");
            System.out.println(buf.capacity());

            ByteBuffer duplicate = buf.asReadOnlyBuffer();

            String filename = "generatedvideo_09.webm";
            try {
                String dir = "Users/generatedWebm/";
                File d=new File(dir);
                if (!d.exists()) {
                    d.mkdirs();
                }
                writeDataToFile(filename, d, duplicate);
            } catch (FileNotFoundException e){;}catch (IOException e){;}


        } else if (msg instanceof CloseWebSocketFrame) {
            ctx.write(new CloseWebSocketFrame());
            ctx.close();
        }

我在webclient中使用websocket将数据发送到我的服务器并打印出blob的大小：

 mediaRecorder.ondataavailable = function(event) {
 if (event.data && event.data.size > 0) {
 recordedBlobs.push(event.data);
 console.log(count + ':'+ event.data.size);
 count = count + 1;
 ws.send(event.data);

}

我发现有时来自客户端的消息与我在Netty服务器中收到的消息不一致：客户端控制台消息：

2214:84794

（当count = 2214时，event.data.size = 84794）但是，我的服务器端：

 [java] 2214
 [java]  readable bytes of message78976
 [java] buffer position:0
 [java] buffer limit:78976
 [java] buffer capacity:78976

这种情况没有任何规则，只是出乎意料。我认为这与netty的低级内存管理有关。任何信息将不胜感激！谢谢！

BinaryWebSocketFrame中的字节丢失

0 个答案: