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public class MyChannelInitializer extends ChannelInitializer<SocketChannel> {@Overrideprotected void initChannel(SocketChannel channel) throws Exception {//protobuf 处理channel.pipeline().addLast(new ProtobufVarint32FrameDecoder());channel.pipeline().addLast(new ProtobufDecoder(MsgBody.getDefaultInstance()));channel.pipeline().addLast(new ProtobufVarint32LengthFieldPrepender());channel.pipeline().addLast(new ProtobufEncoder());// 在管道中添加我们自己的接收数据实现方法channel.pipeline().addLast(new MyClientHandler());}
}

public class MyClientHandler extends ChannelInboundHandlerAdapter {/*** 当客户端主动链接服务端的链接后，这个通道就是活跃的了。也就是客户端与服务端建立了通信通道并且可以传输数据*/@Overridepublic void channelActive(ChannelHandlerContext ctx) throws Exception {SocketChannel channel = (SocketChannel) ctx.channel();System.out.println("链接报告开始");System.out.println("链接报告信息：本客户端链接到服务端。channelId：" + channel.id());System.out.println("链接报告IP:" + channel.localAddress().getHostString());System.out.println("链接报告Port:" + channel.localAddress().getPort());System.out.println("链接报告完毕");//通知客户端链接建立成功String str = "通知服务端链接建立成功" + " " + new Date() + " " + channel.localAddress().getHostString();ctx.writeAndFlush(MsgUtil.buildMsg(channel.id().toString(), str));}/*** 当客户端主动断开服务端的链接后，这个通道就是不活跃的。也就是说客户端与服务端的关闭了通信通道并且不可以传输数据*/@Overridepublic void channelInactive(ChannelHandlerContext ctx) throws Exception {System.out.println("断开链接" + ctx.channel().localAddress().toString());}@Overridepublic void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {//接收msg消息{与上一章节相比，此处已经不需要自己进行解码}System.out.println(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()) + " 接收到消息类型：" + msg.getClass());System.out.println(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()) + " 接收到消息内容：" + JsonFormat.printToString((MsgBody) msg));}/*** 抓住异常，当发生异常的时候，可以做一些相应的处理，比如打印日志、关闭链接*/@Overridepublic void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {ctx.close();System.out.println("异常信息：\r\n" + cause.getMessage());}}

public class NettyClient {public static void main(String[] args) {new NettyClient().connect("127.0.0.1", 7397);}private void connect(String inetHost, int inetPort) {EventLoopGroup workerGroup = new NioEventLoopGroup();try {Bootstrap b = new Bootstrap();b.group(workerGroup);b.channel(NioSocketChannel.class);b.option(ChannelOption.AUTO_READ, true);b.handler(new MyChannelInitializer());ChannelFuture f = b.connect(inetHost, inetPort).sync();System.out.println(" client start done. {关注明哥，获取源码}");f.channel().writeAndFlush(MsgUtil.buildMsg(f.channel().id().toString(),"你好，使用protobuf通信格式的服务端，我是明哥，关注我获取案例源码。"));f.channel().writeAndFlush(MsgUtil.buildMsg(f.channel().id().toString(),"你好，使用protobuf通信格式的服务端，我是明哥，关注我获取案例源码。"));f.channel().writeAndFlush(MsgUtil.buildMsg(f.channel().id().toString(),"你好，使用protobuf通信格式的服务端，我是明哥，关注我获取案例源码。"));f.channel().writeAndFlush(MsgUtil.buildMsg(f.channel().id().toString(),"你好，使用protobuf通信格式的服务端，我是明哥关注我获取案例源码。"));f.channel().writeAndFlush(MsgUtil.buildMsg(f.channel().id().toString(),"你好，使用protobuf通信格式的服务端，我是明哥，关注我获取案例源码。"));f.channel().closeFuture().sync();} catch (InterruptedException e) {e.printStackTrace();} finally {workerGroup.shutdownGracefully();}}}

public class MyChannelInitializer extends ChannelInitializer<SocketChannel> {@Overrideprotected void initChannel(SocketChannel channel) {//protobuf 处理channel.pipeline().addLast(new ProtobufVarint32FrameDecoder());channel.pipeline().addLast(new ProtobufDecoder(MsgBody.getDefaultInstance()));channel.pipeline().addLast(new ProtobufVarint32LengthFieldPrepender());channel.pipeline().addLast(new ProtobufEncoder());// 在管道中添加我们自己的接收数据实现方法channel.pipeline().addLast(new MyServerHandler());}}

public class MyServerHandler extends ChannelInboundHandlerAdapter {/*** 当客户端主动链接服务端的链接后，这个通道就是活跃的了。也就是客户端与服务端建立了通信通道并且可以传输数据*/@Overridepublic void channelActive(ChannelHandlerContext ctx) throws Exception {SocketChannel channel = (SocketChannel) ctx.channel();System.out.println("链接报告开始");System.out.println("链接报告信息：有一客户端链接到本服务端。channelId：" + channel.id());System.out.println("链接报告IP:" + channel.localAddress().getHostString());System.out.println("链接报告Port:" + channel.localAddress().getPort());System.out.println("链接报告完毕");//通知客户端链接建立成功String str = "通知客户端链接建立成功" + " " + new Date() + " " + channel.localAddress().getHostString() + "\r\n";ctx.writeAndFlush(MsgUtil.buildMsg(channel.id().toString(), str));}/*** 当客户端主动断开服务端的链接后，这个通道就是不活跃的。也就是说客户端与服务端的关闭了通信通道并且不可以传输数据*/@Overridepublic void channelInactive(ChannelHandlerContext ctx) throws Exception {System.out.println("客户端断开链接" + ctx.channel().localAddress().toString());}@Overridepublic void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {//接收msg消息{与上一章节相比，此处已经不需要自己进行解码}System.out.println(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()) + " 接收到消息类型：" + msg.getClass());System.out.println(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()) + " 接收到消息内容：" + JsonFormat.printToString((MsgBody) msg));}/*** 抓住异常，当发生异常的时候，可以做一些相应的处理，比如打印日志、关闭链接*/@Overridepublic void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {ctx.close();System.out.println("异常信息：\r\n" + cause.getMessage());}}

public class NettyServer {public static void main(String[] args) {new NettyServer().bing(7397);}private void bing(int port) {//配置服务端NIO线程组EventLoopGroup parentGroup = new NioEventLoopGroup(); //NioEventLoopGroup extends MultithreadEventLoopGroup Math.max(1, SystemPropertyUtil.getInt("io.netty.eventLoopThreads", NettyRuntime.availableProcessors() * 2));EventLoopGroup childGroup = new NioEventLoopGroup();try {ServerBootstrap b = new ServerBootstrap();b.group(parentGroup, childGroup).channel(NioServerSocketChannel.class)    //非阻塞模式.option(ChannelOption.SO_BACKLOG, 128).childHandler(new MyChannelInitializer());ChannelFuture f = b.bind(port).sync();System.out.println("server start done. {关注我是明哥，获取源码}");f.channel().closeFuture().sync();} catch (InterruptedException e) {e.printStackTrace();} finally {childGroup.shutdownGracefully();parentGroup.shutdownGracefully();}}}

public class MsgUtil {/*** 构建protobuf消息体*/public static MsgBody buildMsg(String channelId, String msgInfo) {MsgBody.Builder msg = MsgBody.newBuilder();msg.setChannelId(channelId);msg.setMsgInfo(msgInfo);return msg.build();}}

测试结果
操作：idea选中E:\itstack\GIT\itstack.org\itstack-demo-netty\itstack-demo-netty-2-02\protoc-3.5.0-win32\bin 命令：protoc -I=源地址 --java_out=目标地址 源地址/xxx.proto

E:demo-netty\itstack-demo-netty-2-02\protoc-3.5.0-win32\bin>protoc.exe -I=demo-netty\itstack-demo-netty-2-02\src\main\java\org\itstack\demo\netty\proto --java_out=demo-netty\netty-2-02\src\main
\java MsgInfo.proto

启动NettyServer

启动NettyClient

服务端执行结果

客户端执行结果

好了到这里就结束netty之Netty使用Protobuf传输数据的学习，大家一定要跟着动手操作起来。需要的源码的 可si我获取；