Netty 私有协议栈代码实现

私有协议介绍

　　通信协议从广义上区分，可以分为共有协议和私有协议。由于私有协议的灵活性，它往往会在某个公司或者组织内部使用，按需定制，也因为如此，升级起来会非常方便，灵活性好。

　　Netty私有协议栈功能设计

　　Netty协议栈用于内部各模块之间的通信，它基于TCP/IP协议栈，是一个类似HTTP协议的应用层协议栈，相比与传统的标准协议栈，它更加轻巧、灵活和实用

　　1.功能描述

　　　　1）基于Netty的NIO通信框架，提供高性能的异步通信能力。

　　　　2）提供消息的编解码框架，可以实现POJO的序列化和反序列化。

　　　　3）提供基于IP地址的白名单接入认证机制。

　　　　4）链路的有效性校验机制

　　　　5）链路的断连重连机制。

　　2.通信模型

　　3.消息定义

　　　　　　Netty消息定义表（NettyMessage）

名称

类型

长度

描述

Header

变长

消息头

Body

Object

变长

对于请求消息，它是方法的参数

对于响应消息，它是返回值

　　　　Netty协议消息头定义（Header）

名称	类型	长度	描述
crcCode	整型 int	32	Netty消息的校验码，它由三部分组成 1）0xABEF：固定值，表明该消息是Netty私有协议，2个字节 2）主版本号:1~255，一个字节 3）此版本号：1~255，一个字节 crcCode=0xABEF+主版本号+次版本号
length	整型 int	32	对于请求消息，它是方法的参数对于响应消息，它是返回值
sessionID	长整型long	64	集群节点全局唯一，由回话ID生成器生成
type	Byte	8	0：业务请求消息 1：业务响应消息 2：业务ONE WAY消息 3：握手请求消息 4：握手应答消息 5：心跳请求消息 6：心跳应答消息
priority	Byte	8	消息优先级
attachment	Map<String,Object>	变长	扩展消息

代码实现

package com.cw.netty.high.protocol.bean;

import java.util.HashMap;
import java.util.Map;

/**
 * 消息头header定义
 *
 * @author chenwei
 * @create 2018-07-02 11:20
 **/

public class Header {

    private int crcCode=0xabef0101;

    private int length;//消息长度

    private long sessionID;//会话ID

    private byte type;//消息类型

    private byte priority;//消息优先级

    private Map<String, Object> attachment = new HashMap<String, Object>();//附件

    public int getCrcCode() {
        return crcCode;
    }

    public void setCrcCode(int crcCode) {
        this.crcCode = crcCode;
    }

    public int getLength() {
        return length;
    }

    public void setLength(int length) {
        this.length = length;
    }

    public long getSessionID() {
        return sessionID;
    }

    public void setSessionID(long sessionID) {
        this.sessionID = sessionID;
    }

    public byte getType() {
        return type;
    }

    public void setType(byte type) {
        this.type = type;
    }

    public byte getPriority() {
        return priority;
    }

    public void setPriority(byte priority) {
        this.priority = priority;
    }

    public Map<String, Object> getAttachment() {
        return attachment;
    }

    public void setAttachment(Map<String, Object> attachment) {
        this.attachment = attachment;
    }

    @Override
    public String toString() {
        return "Header{" +
                "crcCode=" + crcCode +
                ", length=" + length +
                ", sessionID=" + sessionID +
                ", type=" + type +
                ", priority=" + priority +
                ", attachment=" + attachment +
                '}';
    }
}

package com.cw.netty.high.protocol;

import com.cw.netty.high.protocol.bean.Header;

/**
 * netty消息类定义
 *
 * @author chenwei
 * @create 2018-07-02 11:19
 **/

public class NettyMessage {

    private Header header;//消息头

    private Object body;//消息体

    public Header getHeader() {
        return header;
    }

    public void setHeader(Header header) {
        this.header = header;
    }

    public Object getBody() {
        return body;
    }

    public void setBody(Object body) {
        this.body = body;
    }

    @Override
    public String toString() {
        return "NettyMessage{" +
                "header=" + header +
                ", body=" + body +
                '}';
    }
}

package com.cw.netty.high.protocol;

/**
 * @author chenwei
 * @create 2018-07-02 17:05
 **/

public class MessageType {

//    public static final byte LOGIN_R2=0;//业务请求消息
//    public static final byte LOGIN_1=1;//业务响应消息
//    public static final byte LOGIN_2=2;//业务ONE WAY 消息
    public static final byte LOGIN_REQ=3;//握手请求消息
    public static final byte LOGIN_RESP=4;//握手应答消息
    public static final byte HEARTBEAT_REQ=5;//心跳请求消息
    public static final byte HEARTBEAT_RESP=6;//心跳应答消息
}

package com.cw.netty.high.protocol;

import com.cw.netty.high.protocol.bean.MarshallingCodecFactory;
import com.cw.netty.high.protocol.bean.NettyMarshallingEncoder;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToMessageEncoder;

import java.util.List;
import java.util.Map;

/**
 * 消息编码器
 *
 * @author chenwei
 * @create 2018-07-02 11:32
 **/

public class NettyMessageEncoder extends MessageToMessageEncoder<NettyMessage> {

    private NettyMarshallingEncoder marshallingEncoder;

    public NettyMessageEncoder(){
        marshallingEncoder= MarshallingCodecFactory.buildMarshallingEncoder();
    }

    @Override
    protected void encode(ChannelHandlerContext channelHandlerContext, NettyMessage nettyMessage, List<Object> out)  throws Exception{
        if (nettyMessage == null || nettyMessage.getHeader()==null) {
            throw new Exception("The encode message is null");
        }
        ByteBuf buffer = Unpooled.buffer();
        System.out.println("开始编码："+nettyMessage);
        //按顺利编码后，根据定义的字段数据类型写入ByteBuf,解码时也要按顺序挨个取出
        buffer.writeInt(nettyMessage.getHeader().getCrcCode());
        buffer.writeInt(nettyMessage.getHeader().getLength());
        buffer.writeLong(nettyMessage.getHeader().getSessionID());
        buffer.writeByte(nettyMessage.getHeader().getType());
        buffer.writeByte(nettyMessage.getHeader().getPriority());
        buffer.writeInt(nettyMessage.getHeader().getAttachment().size());
        String key=null;
        Object value=null;
        byte[] keyArray=null;
        //针对header中的附件编码
        for (Map.Entry<String,Object> param : nettyMessage.getHeader().getAttachment().entrySet()) {
            key=param.getKey();
            keyArray= key.getBytes("UTF-8");
            value= param.getValue();

            buffer.writeInt(keyArray.length);
            buffer.writeBytes(keyArray);
            marshallingEncoder.encode(channelHandlerContext,value,buffer);

        }
        if (nettyMessage.getBody() != null) {
            //使用MarshallingEncoder编码消息体
            marshallingEncoder.encode(channelHandlerContext,nettyMessage.getBody(),buffer);
        }else {
            //没有消息体的话，就赋予0值
            buffer.writeInt(0);
        }
        //更新消息长度字段的值，至于为什么-8，是因为8是长度字段后的偏移量，LengthFieldBasedFrameDecoder的源码中
        //对长度字段和长度的偏移量之和做了判断，如果不-8，会导致LengthFieldBasedFrameDecoder解码返回null
        //这是 《Netty权威指南》中的写错的地方
        buffer.setInt(4, buffer.readableBytes()-8);
        //书中此处没有add，也即没有将ByteBuf加入到List中，也就没有消息进行编码了，所以导致运行了没有效果……
        out.add(buffer);
    }


}

package com.cw.netty.high.protocol;

import com.cw.netty.high.protocol.bean.Header;
import com.cw.netty.high.protocol.bean.MarshallingCodecFactory;
import com.cw.netty.high.protocol.bean.NettyMarshallingDecoder;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;

import java.util.HashMap;
import java.util.Map;

/**
 * Netty消息解码类
 * @author chenwei
 * @create 2018-07-02 16:31
 *
 * 继承LengthFieldBasedFrameDecoder是为了更好了使用它对tcp的粘包和半包处理，
 * 只需要给我表示消息长度的字段偏移量和消息长度自身所占的字节数，该解码器就能
 * 自动实现对半包的处理，调用父类LengthFieldBasedFrameDecoder的decode方法后，
 * 返回的就是整包消息或者为null,
 **/

public class NettyMessageDecoder extends LengthFieldBasedFrameDecoder {

    NettyMarshallingDecoder marshallingDecoder;

    public NettyMessageDecoder(int maxFrameLength, int lengthFieldOffset, int lengthFieldLength) {
        super(maxFrameLength, lengthFieldOffset, lengthFieldLength);
        marshallingDecoder = MarshallingCodecFactory.buildMarshallingDecoder();
    }

    @Override
    protected Object decode(ChannelHandlerContext ctx, ByteBuf in1) throws Exception {
        //父类解码后的消息，后续就针对处理后的消息体进行解码，这也是
        //《Netty权威指南》的另一处书写错误，书中仍对原ByteBuf进行读取
        //由于父类decode后，读指针已经到达了消息头总长度处，此后再对原消息
        //进行读取后报处下标越界的异常
        ByteBuf frame=(ByteBuf) super.decode(ctx, in1);
        if (frame == null) {
            return null;
        }
        NettyMessage message =new NettyMessage();
        Header header=new Header();
        header.setCrcCode(frame.readInt());
        header.setLength(frame.readInt());
        header.setSessionID(frame.readLong());
        header.setType(frame.readByte());
        header.setPriority(frame.readByte());
        int size= frame.readInt();
        if (size > 0) {
            int keySize=0;
            byte[] keyArray=null;
            String key=null;

            Map<String, Object> attch = new HashMap<String, Object>();
            for (int i = 0; i <size ; i++) {
                keySize= frame.readInt();
                keyArray = new byte[keySize];
                frame.readBytes(keyArray);
                key = new String(keyArray, "UTF-8");
                attch.put(key, marshallingDecoder.decode(ctx,frame));

            }
            header.setAttachment(attch);
        }
        //readableBytes即为判断剩余可读取的字节数（ this.writerIndex - this.readerIndex）
        //大于4说明有消息体（无消息体时readableBytes=4），故进行解码
        if (frame.readableBytes() > 4) {
            message.setBody(marshallingDecoder.decode(ctx, frame));
        }
        message.setHeader(header);
        return message;
    }
}

package com.cw.netty.high.protocol;

import com.cw.netty.high.protocol.bean.Header;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;

/**
 * @author chenwei
 * @create 2018-07-02 17:02
 **/

public class LoginAuthReqHandler extends ChannelHandlerAdapter {


    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        //建立连接后，发送认证消息
        NettyMessage message=buildLoginReq();
        System.out.println("client 发送 认证消息：message="+message);
        ctx.writeAndFlush(message);
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {

        NettyMessage message=(NettyMessage)msg;
        //若是握手应答消息，判断是否认证成功
        if (message.getHeader() != null && message.getHeader().getType() == MessageType.LOGIN_RESP) {
           byte loginResult= (byte)message.getBody();
            if (loginResult != 0) {
                //握手失败，关闭连接
                ctx.close();
            }else {
                System.out.println("login is ok :"+message);
                ctx.fireChannelRead(msg);
            }

        }else{
            ctx.fireChannelRead(msg);
        }
    }

    private NettyMessage buildLoginReq(){
        NettyMessage message=new NettyMessage();
        Header header=new Header();
        header.setType((byte) MessageType.LOGIN_REQ);
        message.setHeader(header);
        return message;
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        ctx.fireExceptionCaught(cause);
    }
}

package com.cw.netty.high.protocol;

import com.cw.netty.high.protocol.bean.Header;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;

import java.net.InetSocketAddress;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @author chenwei
 * @create 2018-07-02 17:19
 **/

public class LoginAuthRespHandler extends ChannelHandlerAdapter {

    private Map<String, Boolean> nodeCheck = new ConcurrentHashMap<>();

    private String [] whiteList={"127.0.0.1","10.155.33.113"};

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        NettyMessage message=(NettyMessage)msg;
        //若为握手认证消息，则校验并返回响应，否则传递到下一个handler
        if (message.getHeader() != null && message.getHeader().getType() == MessageType.LOGIN_REQ) {
            String nodeIndex= ctx.channel().remoteAddress().toString();
            NettyMessage loginResp=null;
            if (nodeCheck.containsKey(nodeIndex)) {
                //重复登陆，拒绝
                loginResp=buildResponse((byte)-1);
                System.out.println("重复登陆，拒绝 ：ip="+nodeIndex);
            }else{
                boolean isOk=true;
               InetSocketAddress address=(InetSocketAddress) ctx.channel().remoteAddress();
               String ip=  address.getAddress().getHostAddress();
               for (String wip:whiteList){
                   if (wip.equals(ip)) {
                       isOk=true;
                       nodeCheck.put(ip, true);
                       System.out.println("通过白名单检测 ip="+ip);
                       break;
                   }
               }
               loginResp=isOk?buildResponse((byte) 0):buildResponse((byte)-1);
            }
            ctx.writeAndFlush(loginResp);

        }else {
            ctx.fireChannelRead(msg);
        }

    }

    private NettyMessage buildResponse(byte result){
        NettyMessage message=new NettyMessage();
        Header header=new Header();
        header.setType(MessageType.LOGIN_RESP);
        message.setHeader(header);
        message.setBody(result);
        return message;
    }


    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        nodeCheck.remove(ctx.channel().remoteAddress().toString());
        ctx.close();
        ctx.fireExceptionCaught(cause);
    }
}

package com.cw.netty.high.protocol;

import com.cw.netty.high.protocol.bean.Header;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;

import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;

/**
 * 客户端心跳检测
 * @author chenwei
 * @create 2018-07-02 17:36
 **/

public class HeartBeatReqHandler extends ChannelHandlerAdapter {

    private volatile ScheduledFuture heartBeaet;
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        NettyMessage message= (NettyMessage)msg;
        //认证成功后，定时发送心跳检测
        if (message.getHeader() != null && message.getHeader().getType() == MessageType.LOGIN_RESP) {
            heartBeaet=ctx.executor().scheduleAtFixedRate(new HeartBeatTask(ctx), 0, 5000, TimeUnit.MILLISECONDS);
        } else if (message.getHeader() != null && message.getHeader().getType() == MessageType.HEARTBEAT_RESP) {
            System.out.println("client receive server heart beat message :-->"+message);
        }else {
            ctx.fireChannelRead(msg);
        }
    }


    private class HeartBeatTask implements Runnable{
        ChannelHandlerContext ctx;

        public HeartBeatTask(ChannelHandlerContext ctx) {
            this.ctx=ctx;
        }

        @Override
        public void run() {
            NettyMessage nettyMessage=buildHeatBeat();
            System.out.println("client send heart beat message to server :--->"+nettyMessage);
            ctx.writeAndFlush(nettyMessage);

        }
    }
    //心跳检测仅消息头就够了
    private NettyMessage buildHeatBeat(){
        NettyMessage message=new NettyMessage();
        Header header=new Header();
        header.setType(MessageType.HEARTBEAT_REQ);
        message.setHeader(header);
        return message;
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        if (heartBeaet != null) {
            heartBeaet.cancel(true);
            heartBeaet=null;
        }
        ctx.fireExceptionCaught(cause);
    }
}

package com.cw.netty.high.protocol;

import com.cw.netty.high.protocol.bean.Header;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;

/**
 * 服务器端心跳handler
 * @author chenwei
 * @create 2018-07-02 18:00
 **/

public class HeartBeatRespHandler extends ChannelHandlerAdapter {

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        NettyMessage message=(NettyMessage)msg;
        //收到心跳消息后，构造心跳应答消息返回
        if (message.getHeader() != null && message.getHeader().getType() == MessageType.HEARTBEAT_REQ) {
            System.out.println("receive client heart beat message :-->");

            NettyMessage heartBeat=buildHeatBeat();
            System.out.println("send heart beat response message to client:-->"+heartBeat);
            ctx.writeAndFlush(heartBeat);
        }else {
            ctx.fireChannelRead(msg);
        }

    }


    private NettyMessage buildHeatBeat(){
        NettyMessage message=new NettyMessage();
        Header header=new Header();
        header.setType(MessageType.HEARTBEAT_RESP);
        message.setHeader(header);
        return message;
    }


}

package com.cw.netty.high.protocol.bean;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.marshalling.MarshallingDecoder;
import io.netty.handler.codec.marshalling.UnmarshallerProvider;

/**
 * @author chenwei
 * @create 2018-07-02 16:12
 **/

public class NettyMarshallingDecoder extends MarshallingDecoder {
    public NettyMarshallingDecoder(UnmarshallerProvider provider) {
        super(provider);
    }

    public NettyMarshallingDecoder(UnmarshallerProvider provider, int maxObjectSize) {
        super(provider, maxObjectSize);
    }

    public Object decode(ChannelHandlerContext ctx, ByteBuf in) throws Exception{
        return super.decode(ctx,in);
    }
}

package com.cw.netty.high.protocol.bean;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.marshalling.MarshallerProvider;
import io.netty.handler.codec.marshalling.MarshallingEncoder;

/**
 * @author chenwei
 * @create 2018-07-02 16:15
 **/

public class NettyMarshallingEncoder extends MarshallingEncoder {
    public NettyMarshallingEncoder(MarshallerProvider provider) {
        super(provider);
    }

    @Override
    public void encode(ChannelHandlerContext ctx, Object msg, ByteBuf out) throws Exception {
        super.encode(ctx, msg, out);
    }
}

package com.cw.netty.high.protocol.bean;


import io.netty.handler.codec.marshalling.DefaultMarshallerProvider;
import io.netty.handler.codec.marshalling.DefaultUnmarshallerProvider;
import io.netty.handler.codec.marshalling.MarshallerProvider;
import io.netty.handler.codec.marshalling.UnmarshallerProvider;
import org.jboss.marshalling.MarshallerFactory;
import org.jboss.marshalling.Marshalling;
import org.jboss.marshalling.MarshallingConfiguration;

/**
 * @author chenwei
 * @create 2018-07-02 14:15
 **/

public class MarshallingCodecFactory {

    public static NettyMarshallingDecoder buildMarshallingDecoder(){
        final MarshallerFactory factory= Marshalling.getProvidedMarshallerFactory("serial");
        final MarshallingConfiguration configuration=new MarshallingConfiguration();
        configuration.setVersion(5);
        UnmarshallerProvider provider = new DefaultUnmarshallerProvider(factory, configuration);
        NettyMarshallingDecoder decoder = new NettyMarshallingDecoder(provider, 1024);
        return decoder;
    }

    public static NettyMarshallingEncoder buildMarshallingEncoder(){
        final MarshallerFactory factory= Marshalling.getProvidedMarshallerFactory("serial");
        final MarshallingConfiguration configuration=new MarshallingConfiguration();
        configuration.setVersion(5);
        MarshallerProvider provider = new DefaultMarshallerProvider(factory, configuration);
        NettyMarshallingEncoder encoder = new NettyMarshallingEncoder(provider);
        return encoder;
    }

}

Netty客户端：

package com.cw.netty.high.protocol;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.*;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.timeout.ReadTimeoutHandler;

import java.net.InetSocketAddress;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

/**
 * @author chenwei
 * @create 2018-07-02 18:15
 **/

public class NettyClient {

    private ScheduledExecutorService executorService = Executors.newScheduledThreadPool(1);

    public void connect(final int port, final String host)throws Exception{

        try {

        Bootstrap boot=new Bootstrap();
        EventLoopGroup group = new NioEventLoopGroup();

        boot.group(group).channel(NioSocketChannel.class)
                .option(ChannelOption.TCP_NODELAY,true)
                .handler(new ChannelInitializer<Channel>() {
                    @Override
                    protected void initChannel(Channel channel) throws Exception {
                        channel.pipeline().addLast(new NettyMessageDecoder(1024*1024,4,4));
                        channel.pipeline().addLast("messageEncoder",new NettyMessageEncoder());
                        //添加超时处理handler，规定时间内没有收到消息则关闭链路
                        channel.pipeline().addLast("readTimeoutHandler", new ReadTimeoutHandler(50));
                        channel.pipeline().addLast("loginAuthHandler", new LoginAuthReqHandler());
                        channel.pipeline().addLast("heartbeatHandler", new HeartBeatReqHandler());

                    }
                });

        ChannelFuture future = boot.connect(new InetSocketAddress(host, port),new InetSocketAddress("127.0.0.1",8889)).sync();
        System.out.println("client is start……");
        future.channel().closeFuture().sync();

        }finally {
            //释放完毕后，清空资源，再次发起重连操作
            executorService.execute(new Runnable() {

                @Override
                public void run() {
                    try {
                        System.out.println("重连……");
                        TimeUnit.SECONDS.sleep(5);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    try {
                        connect(port,host);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            });


        }

    }

    public static void main(String[] args) throws Exception {
        new NettyClient().connect(8000,"127.0.0.1");
    }


}

服务端：

package com.cw.netty.high.protocol;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import io.netty.handler.timeout.ReadTimeoutHandler;

/**
 * @author chenwei
 * @create 2018-07-02 18:36
 **/

public class NettyServer {

    public void bind() throws Exception{
        EventLoopGroup bossGroup = new NioEventLoopGroup();
        EventLoopGroup workGroup = new NioEventLoopGroup();

        ServerBootstrap bootstrap=new ServerBootstrap();
        bootstrap.group(bossGroup, workGroup).channel(NioServerSocketChannel.class)
                .option(ChannelOption.SO_BACKLOG, 100)
                .handler(new LoggingHandler(LogLevel.INFO))
                .childHandler(new ChannelInitializer<SocketChannel>() {
                    @Override
                    protected void initChannel(SocketChannel socketChannel) throws Exception {
                        socketChannel.pipeline().addLast(new NettyMessageDecoder(1024*1024,4,4));
                        socketChannel.pipeline().addLast(new NettyMessageEncoder());
                        socketChannel.pipeline().addLast("readTimeoutHandler",new ReadTimeoutHandler(50));
                        socketChannel.pipeline().addLast(new LoginAuthRespHandler());
                        socketChannel.pipeline().addLast("HeartBeathandler",new HeartBeatRespHandler());

                    }
                });

        bootstrap.bind("127.0.0.1",8000).sync();
        System.out.println("netty server start ok:"+("127.0.0.1"+8000));


    }

    public static void main(String[] args) throws Exception {
        new NettyServer().bind();
    }

}

Netty 私有协议栈 代码实现

私有协议介绍

Netty私有协议栈功能设计

1.功能描述

2.通信模型

3.消息定义

代码实现

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Netty 私有协议栈代码实现

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