MsgPackDecoder

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToMessageDecoder;
import org.msgpack.MessagePack;
import java.util.List;
/*基于MessagePack的解码器，反序列化*/
public class MsgPackDecoder extends MessageToByteEncoder<ByteBuf> {
    @Override
    protected void decode(ChannelHandlerContext ctx, ByteBuf msg, List<Object> out)
            throws Exception {
        final int length = msg.readableBytes();
        final byte[] array = new byte[length];
        msg.getBytes(msg.readerIndex(),array,0,length);
        MessagePack messagePack = new MessagePack();
        out.add(messagePack.read(array,User.class));
    }
}