ProtoClientHandler.java

package com.snowcattle.game.common.socket.client;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;

/**
 * Created by jiangwenping on 17/1/24.
 */
public class ProtoClientHandler  extends ChannelInboundHandlerAdapter {
    private final ByteBuf firstMessage;

    public ProtoClientHandler() {
        firstMessage = Unpooled.buffer(1024);
        byte[] sendString = "hello world".getBytes();
        firstMessage.writeInt(sendString.length);
        firstMessage.writeBytes(sendString);
//        firstMessage.writeInt(234);
    }


    @Override
    public void channelActive(ChannelHandlerContext ctx) {
        ctx.writeAndFlush(firstMessage);
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) {
        ctx.write(msg);
        System.out.println(msg);
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) {
        ctx.flush();
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        // Close the connection when an exception is raised.
        cause.printStackTrace();
        ctx.close();
    }

}