Netty自定义解码器

package cn.sttit.clw.decoder;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToMessageDecoder;

import java.util.List;

/**
 * @Auther: deqiang.li
 * @Date: 2019/3/8 08:53
 * @Description:
 */
public class mydecoder extends MessageToMessageDecoder<ByteBuf> {
    @Override
    protected void decode(ChannelHandlerContext ctx, ByteBuf buffer, List<Object> out) throws Exception {
        byte[] b = new byte[buffer.readableBytes()];
        buffer.readBytes(b);
        if(b.length==0) {
            return;
        }
        out.add(bytesToHexString(b));
    }

    public String bytesToHexString(byte[] bArray) {
        StringBuffer sb = new StringBuffer(bArray.length);
        String sTemp;
        for (int i = 0; i < bArray.length; i++) {
            sTemp = Integer.toHexString(0xFF & bArray[i]);
            if (sTemp.length() < 2)
                sb.append(0);
            sb.append(sTemp.toUpperCase());
        }
        return sb.toString();
    }
}