yunsu/cloud-socket/src/com/js/kbt/socket/CustomDecoder.java

package com.js.kbt.socket;

import java.util.List;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.string.StringDecoder;

public class CustomDecoder extends StringDecoder {
	@Override
	protected void decode(ChannelHandlerContext ctx, ByteBuf msg, List<Object> out) throws Exception {
	    String HEXES = "0123456789ABCDEF";
	    byte[] req = new byte[msg.readableBytes()];
	    msg.readBytes(req);
	    final StringBuilder hex = new StringBuilder(2 * req.length);

	    for (int i = 0; i < req.length; i++) {
	        byte b = req[i];
	        hex.append(HEXES.charAt((b & 0xF0) >> 4))
	                .append(HEXES.charAt((b & 0x0F)));
	    }
	    System.out.println("decode="+hex.toString());
	    out.add(hex.toString());

	}
}