有谁精通netty ,数据包解码是,不确定数据包大小,怎么能收到完整的数据包?
5条回答
- qiemengdao 2013-07-05 09:35关注
我有个程序的包结构是这样的:1byte(包类型)+4byte(包体长度)+实际包体,于是写了下面的代码:
[code="java"]
public class ReceivingPacketHandler extends FrameDecoder {
public static fianl int HEADER_SIZE=5;@Override protected Object decode(ChannelHandlerContext ctx, Channel channel, ChannelBuffer buf) throws Exception { if (buf.readableBytes() < HEADER_SIZE) { // The header length field was not received yet - return null. return null; } buf.markReaderIndex(); // Read protocol header buf.readByte(); // Read the data length field. int length = buf.readInt(); buf.resetReaderIndex(); // Make sure if there's enough bytes in the buffer. int totalLength = length + HEADER_SIZE; if (buf.readableBytes() < totalLength) { //the whole packet was not received yet - return null. return null; } Packet recievedPacket = new Packet(size >= 0 ? size : bufSize); recievedPacket.clear(); recievedPacket.readPacket(buf, totalLength); return recievedPacket; }
}
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