经过了前面的NIO基础知识准备，我们已经对NIO有了较大了解，现在就进入netty的实际应用中来看看吧。重点体会整个过程。

按照权威指南写程序的过程中，发现一些问题：当我们在定义handler继承ChannelHanderAdapter时候，发现在其接口中没有可以实现的channelRead方法和channelReadComplete方法,然后查阅官网才发现netty5.0不见了，网上说是舍弃了，然后再看官网的一些例子，发现官网上继承的是ChannelInboundHandlerAdapter,当我将代码中handler的继承类更改为这个的时候发现前面的方法可以实现了。（同时发现ByteBuffer的一些方法调用不能调出书上的方法如readableBytes(),这个是我弄错了，ByteBuffer是jdk的包装类不是netty的，netty的应该用ByteBuf）为此将netty版本变更为

一、首先我们需要一个netty的环境，netty的环境搭建只需要一个netty的jar包即可。

　　在maven工程中导入netty的jar资源

  1.  <dependency>
  2.              <groupId>io.netty</groupId>
  3.              <artifactId>netty-all</artifactId>
  4.              <!--<version>5.0.0.Alpha1</version>-->
  5.              <version>4.1.25.Final</version>
  6.          </dependency>

二、netty 服务端代码

TimeServer

  1.  package com.netty.example;
  2.  
  3.  import io.netty.bootstrap.ServerBootstrap;
  4.  import io.netty.channel.ChannelFuture;
  5.  import io.netty.channel.ChannelInitializer;
  6.  import io.netty.channel.ChannelOption;
  7.  import io.netty.channel.EventLoopGroup;
  8.  import io.netty.channel.nio.NioEventLoopGroup;
  9.  import io.netty.channel.socket.SocketChannel;
  10.  import io.netty.channel.socket.nio.NioServerSocketChannel;
  11.  
  12.  public class TimeServer {
  13.      public void bind(int port){
  14.  //        创建接收任务的线程组和处理IO事件的线程组
  15.          EventLoopGroup boosGroup = new NioEventLoopGroup();
  16.          EventLoopGroup workGroup = new NioEventLoopGroup();
  17.          try {
  18.              ServerBootstrap bs = new ServerBootstrap();
  19.              bs.group(boosGroup,workGroup)
  20.                      .channel(NioServerSocketChannel.class)
  21.                      .option(ChannelOption.SO_BACKLOG,1024)
  22.                      .childHandler(new ChildChannelHandler());
  23.  //        绑定端口号，同步等待成功
  24.              ChannelFuture f = bs.bind(port).sync();
  25.  //        等待服务器监听端口关闭
  26.              f.channel().closeFuture().sync();
  27.          } catch (InterruptedException e) {
  28.              e.printStackTrace();
  29.          }finally {
  30.  //          优雅退出释放线程池资源
  31.              boosGroup.shutdownGracefully();
  32.              workGroup.shutdownGracefully();
  33.          }
  34.      }
  35.      public static void main(String[] args){
  36.          int port = 8080;
  37.          if(args!=null&&args.length>0){
  38.              port = Integer.valueOf(args[0]);
  39.          }
  40.          new TimeServer().bind(port);
  41.      }
  42.  
  43.  private  class ChildChannelHandler extends ChannelInitializer<SocketChannel>{
  44.      @Override
  45.      protected void initChannel(SocketChannel socketChannel) throws Exception {
  46.          socketChannel.pipeline().addLast(new TimeServerHandler());
  47.      }
  48.  
  49.  }
  50.  
  51.  }

TimeServerHandler

  1.  package com.netty.example;
  2.  
  3.  import io.netty.buffer.ByteBuf;
  4.  import io.netty.buffer.Unpooled;
  5.  import io.netty.channel.ChannelHandlerContext;
  6.  import io.netty.channel.ChannelInboundHandlerAdapter;
  7.  
  8.  import java.util.Date;
  9.  
  10.  public class TimeServerHandler extends ChannelInboundHandlerAdapter {
  11.  
  12.      @Override
  13.      public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
  14.          ByteBuf buf = (ByteBuf) msg;//将接收到的msg转换为netty的BytyBuf对象，注意区分jdk中的ByteBuffer
  15.          byte[] req = new byte[buf.readableBytes()];//创建接收缓冲区数据的字节数组
  16.          buf.readBytes(req);//将缓冲区的数据读取到字节数组中
  17.          String body = new String(req,"utf-8");//获取请求消息
  18.          System.out.println("The time server receive order:"+body);
  19.          String currentTime = "QUERY TIME ORDER".equalsIgnoreCase(body)?new Date(System.currentTimeMillis()).toString():"BAD ORDER";
  20.          ByteBuf resp = Unpooled.copiedBuffer(currentTime.getBytes());//将响应信息封装为netty 的ByteBuf对象，
  21.          ctx.write(resp);//异步发送应答消息给客户端
  22.      }
  23.  
  24.      @Override
  25.      public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
  26.          /*将消息发送队列中的消息写道SocketChannel中发送给对方。从性能上考虑，为了防止频繁唤醒Selector进行消息发送
  27.          * netty的write方法并不直接将消息写入socketChannel中，调用write方法只是把待发送的消息发送到数据缓冲数组中，
  28.          * 再通过调用flush()方法，将发送缓冲区中的消息全部写道SocketChannel中*/
  29.          ctx.flush();
  30.      }
  31.  
  32.      @Override
  33.      public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
  34.          ctx.close();//发生异常时，关闭ChannelHandlerContext,释放ChannelHandlerContext相关联的句柄资源
  35.      }
  36.  }

三、netty 客户端代码

TimeClient

  1.  package com.netty.example;
  2.  
  3.  import io.netty.bootstrap.Bootstrap;
  4.  import io.netty.channel.ChannelFuture;
  5.  import io.netty.channel.ChannelInitializer;
  6.  import io.netty.channel.ChannelOption;
  7.  import io.netty.channel.EventLoopGroup;
  8.  import io.netty.channel.nio.NioEventLoopGroup;
  9.  import io.netty.channel.socket.SocketChannel;
  10.  import io.netty.channel.socket.nio.NioSocketChannel;
  11.  
  12.  /*
  13.  * 客户端代码
  14.  * */
  15.  public class TimeClient {
  16.  //    配置客户端NIO线程
  17.      public void connection(String host,int port) {
  18.          EventLoopGroup group = new NioEventLoopGroup();
  19.          try {
  20.          Bootstrap bootstrap = new Bootstrap();
  21.          bootstrap.group(group)
  22.                  .channel(NioSocketChannel.class)
  23.                  .option(ChannelOption.TCP_NODELAY,true)
  24.                  .handler(new ChannelInitializer<SocketChannel>() {
  25.                      @Override
  26.                      protected void initChannel(SocketChannel socketChannel) throws Exception {
  27.                          socketChannel.pipeline().addLast(new TimeClientHandler());
  28.                      }
  29.                  });
  30.  //        发起异步连接操作
  31.          ChannelFuture f = bootstrap.connect(host,port).sync();
  32.  //        等待客户端链路关闭
  33.              f.channel().closeFuture().sync();
  34.          } catch (InterruptedException e) {
  35.              e.printStackTrace();
  36.          }finally{
  37.              group.shutdownGracefully();
  38.          }
  39.  
  40.      }
  41.      public static void main(String[] args){
  42.          int port = 8080;
  43.          if(args.length>0&&args!=null){
  44.             port = Integer.valueOf(args[0]);
  45.          }
  46.          new TimeClient().connection("127.0.0.1",port);
  47.      }
  48.  }

TimeClientHandler

  1.  package com.netty.example;
  2.  
  3.  import io.netty.buffer.ByteBuf;
  4.  import io.netty.buffer.Unpooled;
  5.  import io.netty.channel.ChannelHandlerContext;
  6.  import io.netty.channel.ChannelInboundHandlerAdapter;
  7.  
  8.  public class TimeClientHandler extends ChannelInboundHandlerAdapter {
  9.      private final ByteBuf firstMsg;
  10.  
  11.      public TimeClientHandler() {
  12.          byte[] req = "QUERY TIME ORDER".getBytes();
  13.          firstMsg = Unpooled.buffer(req.length);
  14.          firstMsg.writeBytes(req);
  15.      }
  16.  
  17.      @Override
  18.      public void channelActive(ChannelHandlerContext ctx) throws Exception {
  19.      /*    当客户端和服务端TCP链路建立成功之后，Netty的NIO线程会调用channelActive方法，发送查询时间的指令给服务端，
  20.          调用ChannelHandlerContext的writeAndFlush方法将请求消息发送给服务端
  21.             当服务端返回应答消息时，channelRead()方法被调用*/
  22.          ctx.writeAndFlush(firstMsg);
  23.      }
  24.  
  25.      @Override
  26.      public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
  27.          ByteBuf buf = (ByteBuf) msg;
  28.          byte[] req = new byte[buf.readableBytes()];
  29.          buf.readBytes(req);
  30.          String body = new String(req,"utf-8");
  31.          System.out.println("Now is"+body);
  32.      }
  33.  
  34.      @Override
  35.      public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
  36.          ctx.close();
  37.      }
  38.  }

四、启动运行

开启服务端

  1.  D:\java\java1.8\jdk1.8\bin\java.exe "-javaagent:D:\我的软件\itSoft\IntelliJ IDEA\IntelliJ IDEA 2018.1.5\lib\idea_rt.jar=59255:D:\我的软件\itSoft\IntelliJ IDEA\IntelliJ IDEA 2018.1.5\bin" -Dfile.encoding=UTF-8 -classpath D:\java\java1.8\jdk1.8\jre\lib\charsets.jar;D:\java\java1.8\jdk1.8\jre\lib\deploy.jar;D:\java\java1.8\jdk1.8\jre\lib\ext\access-bridge-64.jar;D:\java\java1.8\jdk1.8\jre\lib\ext\cldrdata.jar;D:\java\java1.8\jdk1.8\jre\lib\ext\dnsns.jar;D:\java\java1.8\jdk1.8\jre\lib\ext\jaccess.jar;D:\java\java1.8\jdk1.8\jre\lib\ext\jfxrt.jar;D:\java\java1.8\jdk1.8\jre\lib\ext\localedata.jar;D:\java\java1.8\jdk1.8\jre\lib\ext\nashorn.jar;D:\java\java1.8\jdk1.8\jre\lib\ext\sunec.jar;D:\java\java1.8\jdk1.8\jre\lib\ext\sunjce_provider.jar;D:\java\java1.8\jdk1.8\jre\lib\ext\sunmscapi.jar;D:\java\java1.8\jdk1.8\jre\lib\ext\sunpkcs11.jar;D:\java\java1.8\jdk1.8\jre\lib\ext\zipfs.jar;D:\java\java1.8\jdk1.8\jre\lib\javaws.jar;D:\java\java1.8\jdk1.8\jre\lib\jce.jar;D:\java\java1.8\jdk1.8\jre\lib\jfr.jar;D:\java\java1.8\jdk1.8\jre\lib\jfxswt.jar;D:\java\java1.8\jdk1.8\jre\lib\jsse.jar;D:\java\java1.8\jdk1.8\jre\lib\management-agent.jar;D:\java\java1.8\jdk1.8\jre\lib\plugin.jar;D:\java\java1.8\jdk1.8\jre\lib\resources.jar;D:\java\java1.8\jdk1.8\jre\lib\rt.jar;D:\netty\target\classes;C:\Users\litan\.m2\repository\org\springframework\boot\spring-boot-starter-data-redis\2.0.3.RELEASE\spring-boot-starter-data-redis-2.0.3.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\boot\spring-boot-starter\2.0.3.RELEASE\spring-boot-starter-2.0.3.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\boot\spring-boot\2.0.3.RELEASE\spring-boot-2.0.3.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\boot\spring-boot-autoconfigure\2.0.3.RELEASE\spring-boot-autoconfigure-2.0.3.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\boot\spring-boot-starter-logging\2.0.3.RELEASE\spring-boot-starter-logging-2.0.3.RELEASE.jar;C:\Users\litan\.m2\repository\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;C:\Users\litan\.m2\repository\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;C:\Users\litan\.m2\repository\org\apache\logging\log4j\log4j-to-slf4j\2.10.0\log4j-to-slf4j-2.10.0.jar;C:\Users\litan\.m2\repository\org\apache\logging\log4j\log4j-api\2.10.0\log4j-api-2.10.0.jar;C:\Users\litan\.m2\repository\org\slf4j\jul-to-slf4j\1.7.25\jul-to-slf4j-1.7.25.jar;C:\Users\litan\.m2\repository\javax\annotation\javax.annotation-api\1.3.2\javax.annotation-api-1.3.2.jar;C:\Users\litan\.m2\repository\org\yaml\snakeyaml\1.19\snakeyaml-1.19.jar;C:\Users\litan\.m2\repository\org\springframework\data\spring-data-redis\2.0.8.RELEASE\spring-data-redis-2.0.8.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\data\spring-data-keyvalue\2.0.8.RELEASE\spring-data-keyvalue-2.0.8.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\data\spring-data-commons\2.0.8.RELEASE\spring-data-commons-2.0.8.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\spring-tx\5.0.7.RELEASE\spring-tx-5.0.7.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\spring-oxm\5.0.7.RELEASE\spring-oxm-5.0.7.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\spring-aop\5.0.7.RELEASE\spring-aop-5.0.7.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\spring-context-support\5.0.7.RELEASE\spring-context-support-5.0.7.RELEASE.jar;C:\Users\litan\.m2\repository\org\slf4j\slf4j-api\1.7.25\slf4j-api-1.7.25.jar;C:\Users\litan\.m2\repository\io\lettuce\lettuce-core\5.0.4.RELEASE\lettuce-core-5.0.4.RELEASE.jar;C:\Users\litan\.m2\repository\io\projectreactor\reactor-core\3.1.8.RELEASE\reactor-core-3.1.8.RELEASE.jar;C:\Users\litan\.m2\repository\org\reactivestreams\reactive-streams\1.0.2\reactive-streams-1.0.2.jar;C:\Users\litan\.m2\repository\io\netty\netty-common\4.1.25.Final\netty-common-4.1.25.Final.jar;C:\Users\litan\.m2\repository\io\netty\netty-transport\4.1.25.Final\netty-transport-4.1.25.Final.jar;C:\Users\litan\.m2\repository\io\netty\netty-buffer\4.1.25.Final\netty-buffer-4.1.25.Final.jar;C:\Users\litan\.m2\repository\io\netty\netty-resolver\4.1.25.Final\netty-resolver-4.1.25.Final.jar;C:\Users\litan\.m2\repository\io\netty\netty-handler\4.1.25.Final\netty-handler-4.1.25.Final.jar;C:\Users\litan\.m2\repository\io\netty\netty-codec\4.1.25.Final\netty-codec-4.1.25.Final.jar;C:\Users\litan\.m2\repository\org\springframework\boot\spring-boot-starter-web\2.0.3.RELEASE\spring-boot-starter-web-2.0.3.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\boot\spring-boot-starter-json\2.0.3.RELEASE\spring-boot-starter-json-2.0.3.RELEASE.jar;C:\Users\litan\.m2\repository\com\fasterxml\jackson\core\jackson-databind\2.9.6\jackson-databind-2.9.6.jar;C:\Users\litan\.m2\repository\com\fasterxml\jackson\core\jackson-annotations\2.9.0\jackson-annotations-2.9.0.jar;C:\Users\litan\.m2\repository\com\fasterxml\jackson\core\jackson-core\2.9.6\jackson-core-2.9.6.jar;C:\Users\litan\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.9.6\jackson-datatype-jdk8-2.9.6.jar;C:\Users\litan\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.9.6\jackson-datatype-jsr310-2.9.6.jar;C:\Users\litan\.m2\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.9.6\jackson-module-parameter-names-2.9.6.jar;C:\Users\litan\.m2\repository\org\springframework\boot\spring-boot-starter-tomcat\2.0.3.RELEASE\spring-boot-starter-tomcat-2.0.3.RELEASE.jar;C:\Users\litan\.m2\repository\org\apache\tomcat\embed\tomcat-embed-core\8.5.31\tomcat-embed-core-8.5.31.jar;C:\Users\litan\.m2\repository\org\apache\tomcat\embed\tomcat-embed-el\8.5.31\tomcat-embed-el-8.5.31.jar;C:\Users\litan\.m2\repository\org\apache\tomcat\embed\tomcat-embed-websocket\8.5.31\tomcat-embed-websocket-8.5.31.jar;C:\Users\litan\.m2\repository\org\hibernate\validator\hibernate-validator\6.0.10.Final\hibernate-validator-6.0.10.Final.jar;C:\Users\litan\.m2\repository\javax\validation\validation-api\2.0.1.Final\validation-api-2.0.1.Final.jar;C:\Users\litan\.m2\repository\org\jboss\logging\jboss-logging\3.3.2.Final\jboss-logging-3.3.2.Final.jar;C:\Users\litan\.m2\repository\com\fasterxml\classmate\1.3.4\classmate-1.3.4.jar;C:\Users\litan\.m2\repository\org\springframework\spring-web\5.0.7.RELEASE\spring-web-5.0.7.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\spring-beans\5.0.7.RELEASE\spring-beans-5.0.7.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\spring-webmvc\5.0.7.RELEASE\spring-webmvc-5.0.7.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\spring-context\5.0.7.RELEASE\spring-context-5.0.7.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\spring-expression\5.0.7.RELEASE\spring-expression-5.0.7.RELEASE.jar;C:\Users\litan\.m2\repository\mysql\mysql-connector-java\5.1.46\mysql-connector-java-5.1.46.jar;C:\Users\litan\.m2\repository\org\springframework\spring-core\5.0.7.RELEASE\spring-core-5.0.7.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\spring-jcl\5.0.7.RELEASE\spring-jcl-5.0.7.RELEASE.jar;C:\Users\litan\.m2\repository\io\netty\netty-all\4.1.25.Final\netty-all-4.1.25.Final.jar com.netty.example.TimeServer
  2.  22:06:36.427 [main] DEBUG io.netty.util.internal.logging.InternalLoggerFactory - Using SLF4J as the default logging framework
  3.  22:06:36.462 [main] DEBUG io.netty.channel.MultithreadEventLoopGroup - -Dio.netty.eventLoopThreads: 8
  4.  22:06:36.509 [main] DEBUG io.netty.channel.nio.NioEventLoop - -Dio.netty.noKeySetOptimization: false
  5.  22:06:36.509 [main] DEBUG io.netty.channel.nio.NioEventLoop - -Dio.netty.selectorAutoRebuildThreshold: 512
  6.  22:06:36.556 [main] DEBUG io.netty.util.internal.PlatformDependent - Platform: Windows
  7.  22:06:36.562 [main] DEBUG io.netty.util.internal.PlatformDependent0 - -Dio.netty.noUnsafe: false
  8.  22:06:36.563 [main] DEBUG io.netty.util.internal.PlatformDependent0 - Java version: 8
  9.  22:06:36.567 [main] DEBUG io.netty.util.internal.PlatformDependent0 - sun.misc.Unsafe.theUnsafe: available
  10.  22:06:36.568 [main] DEBUG io.netty.util.internal.PlatformDependent0 - sun.misc.Unsafe.copyMemory: available
  11.  22:06:36.569 [main] DEBUG io.netty.util.internal.PlatformDependent0 - java.nio.Buffer.address: available
  12.  22:06:36.570 [main] DEBUG io.netty.util.internal.PlatformDependent0 - direct buffer constructor: available
  13.  22:06:36.571 [main] DEBUG io.netty.util.internal.PlatformDependent0 - java.nio.Bits.unaligned: available, true
  14.  22:06:36.571 [main] DEBUG io.netty.util.internal.PlatformDependent0 - jdk.internal.misc.Unsafe.allocateUninitializedArray(int): unavailable prior to Java9
  15.  22:06:36.571 [main] DEBUG io.netty.util.internal.PlatformDependent0 - java.nio.DirectByteBuffer.<init>(long, int): available
  16.  22:06:36.571 [main] DEBUG io.netty.util.internal.PlatformDependent - sun.misc.Unsafe: available
  17.  22:06:36.573 [main] DEBUG io.netty.util.internal.PlatformDependent - -Dio.netty.tmpdir: C:\Users\litan\AppData\Local\Temp (java.io.tmpdir)
  18.  22:06:36.575 [main] DEBUG io.netty.util.internal.PlatformDependent - -Dio.netty.bitMode: 64 (sun.arch.data.model)
  19.  22:06:36.577 [main] DEBUG io.netty.util.internal.PlatformDependent - -Dio.netty.noPreferDirect: false
  20.  22:06:36.577 [main] DEBUG io.netty.util.internal.PlatformDependent - -Dio.netty.maxDirectMemory: 1890582528 bytes
  21.  22:06:36.577 [main] DEBUG io.netty.util.internal.PlatformDependent - -Dio.netty.uninitializedArrayAllocationThreshold: -1
  22.  22:06:36.581 [main] DEBUG io.netty.util.internal.CleanerJava6 - java.nio.ByteBuffer.cleaner(): available
  23.  22:06:36.595 [main] DEBUG io.netty.util.internal.PlatformDependent - org.jctools-core.MpscChunkedArrayQueue: available
  24.  22:06:37.179 [main] DEBUG io.netty.channel.DefaultChannelId - -Dio.netty.processId: 14124 (auto-detected)
  25.  22:06:37.186 [main] DEBUG io.netty.util.NetUtil - -Djava.net.preferIPv4Stack: false
  26.  22:06:37.186 [main] DEBUG io.netty.util.NetUtil - -Djava.net.preferIPv6Addresses: false
  27.  22:06:37.538 [main] DEBUG io.netty.util.NetUtil - Loopback interface: lo (Software Loopback Interface 1, 127.0.0.1)
  28.  22:06:37.540 [main] DEBUG io.netty.util.NetUtil - Failed to get SOMAXCONN from sysctl and file \proc\sys\net\core\somaxconn. Default: 200
  29.  22:06:38.027 [main] DEBUG io.netty.channel.DefaultChannelId - -Dio.netty.machineId: 00:50:56:ff:fe:c0:00:01 (auto-detected)
  30.  22:06:38.038 [main] DEBUG io.netty.util.internal.InternalThreadLocalMap - -Dio.netty.threadLocalMap.stringBuilder.initialSize: 1024
  31.  22:06:38.038 [main] DEBUG io.netty.util.internal.InternalThreadLocalMap - -Dio.netty.threadLocalMap.stringBuilder.maxSize: 4096
  32.  22:06:38.090 [main] DEBUG io.netty.util.ResourceLeakDetector - -Dio.netty.leakDetection.level: simple
  33.  22:06:38.091 [main] DEBUG io.netty.util.ResourceLeakDetector - -Dio.netty.leakDetection.targetRecords: 4
  34.  22:06:38.144 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.numHeapArenas: 8
  35.  22:06:38.145 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.numDirectArenas: 8
  36.  22:06:38.145 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.pageSize: 8192
  37.  22:06:38.145 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.maxOrder: 11
  38.  22:06:38.145 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.chunkSize: 16777216
  39.  22:06:38.145 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.tinyCacheSize: 512
  40.  22:06:38.145 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.smallCacheSize: 256
  41.  22:06:38.145 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.normalCacheSize: 64
  42.  22:06:38.145 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.maxCachedBufferCapacity: 32768
  43.  22:06:38.145 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.cacheTrimInterval: 8192
  44.  22:06:38.145 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.useCacheForAllThreads: true
  45.  22:06:38.159 [main] DEBUG io.netty.buffer.ByteBufUtil - -Dio.netty.allocator.type: pooled
  46.  22:06:38.159 [main] DEBUG io.netty.buffer.ByteBufUtil - -Dio.netty.threadLocalDirectBufferSize: 0
  47.  22:06:38.159 [main] DEBUG io.netty.buffer.ByteBufUtil - -Dio.netty.maxThreadLocalCharBufferSize: 16384

客户端运行后

  1.  D:\java\java1.8\jdk1.8\bin\java.exe "-javaagent:D:\我的软件\itSoft\IntelliJ IDEA\IntelliJ IDEA 2018.1.5\lib\idea_rt.jar=59302:D:\我的软件\itSoft\IntelliJ IDEA\IntelliJ IDEA 2018.1.5\bin" -Dfile.encoding=UTF-8 -classpath D:\java\java1.8\jdk1.8\jre\lib\charsets.jar;D:\java\java1.8\jdk1.8\jre\lib\deploy.jar;D:\java\java1.8\jdk1.8\jre\lib\ext\access-bridge-64.jar;D:\java\java1.8\jdk1.8\jre\lib\ext\cldrdata.jar;D:\java\java1.8\jdk1.8\jre\lib\ext\dnsns.jar;D:\java\java1.8\jdk1.8\jre\lib\ext\jaccess.jar;D:\java\java1.8\jdk1.8\jre\lib\ext\jfxrt.jar;D:\java\java1.8\jdk1.8\jre\lib\ext\localedata.jar;D:\java\java1.8\jdk1.8\jre\lib\ext\nashorn.jar;D:\java\java1.8\jdk1.8\jre\lib\ext\sunec.jar;D:\java\java1.8\jdk1.8\jre\lib\ext\sunjce_provider.jar;D:\java\java1.8\jdk1.8\jre\lib\ext\sunmscapi.jar;D:\java\java1.8\jdk1.8\jre\lib\ext\sunpkcs11.jar;D:\java\java1.8\jdk1.8\jre\lib\ext\zipfs.jar;D:\java\java1.8\jdk1.8\jre\lib\javaws.jar;D:\java\java1.8\jdk1.8\jre\lib\jce.jar;D:\java\java1.8\jdk1.8\jre\lib\jfr.jar;D:\java\java1.8\jdk1.8\jre\lib\jfxswt.jar;D:\java\java1.8\jdk1.8\jre\lib\jsse.jar;D:\java\java1.8\jdk1.8\jre\lib\management-agent.jar;D:\java\java1.8\jdk1.8\jre\lib\plugin.jar;D:\java\java1.8\jdk1.8\jre\lib\resources.jar;D:\java\java1.8\jdk1.8\jre\lib\rt.jar;D:\netty\target\classes;C:\Users\litan\.m2\repository\org\springframework\boot\spring-boot-starter-data-redis\2.0.3.RELEASE\spring-boot-starter-data-redis-2.0.3.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\boot\spring-boot-starter\2.0.3.RELEASE\spring-boot-starter-2.0.3.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\boot\spring-boot\2.0.3.RELEASE\spring-boot-2.0.3.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\boot\spring-boot-autoconfigure\2.0.3.RELEASE\spring-boot-autoconfigure-2.0.3.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\boot\spring-boot-starter-logging\2.0.3.RELEASE\spring-boot-starter-logging-2.0.3.RELEASE.jar;C:\Users\litan\.m2\repository\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;C:\Users\litan\.m2\repository\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;C:\Users\litan\.m2\repository\org\apache\logging\log4j\log4j-to-slf4j\2.10.0\log4j-to-slf4j-2.10.0.jar;C:\Users\litan\.m2\repository\org\apache\logging\log4j\log4j-api\2.10.0\log4j-api-2.10.0.jar;C:\Users\litan\.m2\repository\org\slf4j\jul-to-slf4j\1.7.25\jul-to-slf4j-1.7.25.jar;C:\Users\litan\.m2\repository\javax\annotation\javax.annotation-api\1.3.2\javax.annotation-api-1.3.2.jar;C:\Users\litan\.m2\repository\org\yaml\snakeyaml\1.19\snakeyaml-1.19.jar;C:\Users\litan\.m2\repository\org\springframework\data\spring-data-redis\2.0.8.RELEASE\spring-data-redis-2.0.8.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\data\spring-data-keyvalue\2.0.8.RELEASE\spring-data-keyvalue-2.0.8.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\data\spring-data-commons\2.0.8.RELEASE\spring-data-commons-2.0.8.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\spring-tx\5.0.7.RELEASE\spring-tx-5.0.7.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\spring-oxm\5.0.7.RELEASE\spring-oxm-5.0.7.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\spring-aop\5.0.7.RELEASE\spring-aop-5.0.7.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\spring-context-support\5.0.7.RELEASE\spring-context-support-5.0.7.RELEASE.jar;C:\Users\litan\.m2\repository\org\slf4j\slf4j-api\1.7.25\slf4j-api-1.7.25.jar;C:\Users\litan\.m2\repository\io\lettuce\lettuce-core\5.0.4.RELEASE\lettuce-core-5.0.4.RELEASE.jar;C:\Users\litan\.m2\repository\io\projectreactor\reactor-core\3.1.8.RELEASE\reactor-core-3.1.8.RELEASE.jar;C:\Users\litan\.m2\repository\org\reactivestreams\reactive-streams\1.0.2\reactive-streams-1.0.2.jar;C:\Users\litan\.m2\repository\io\netty\netty-common\4.1.25.Final\netty-common-4.1.25.Final.jar;C:\Users\litan\.m2\repository\io\netty\netty-transport\4.1.25.Final\netty-transport-4.1.25.Final.jar;C:\Users\litan\.m2\repository\io\netty\netty-buffer\4.1.25.Final\netty-buffer-4.1.25.Final.jar;C:\Users\litan\.m2\repository\io\netty\netty-resolver\4.1.25.Final\netty-resolver-4.1.25.Final.jar;C:\Users\litan\.m2\repository\io\netty\netty-handler\4.1.25.Final\netty-handler-4.1.25.Final.jar;C:\Users\litan\.m2\repository\io\netty\netty-codec\4.1.25.Final\netty-codec-4.1.25.Final.jar;C:\Users\litan\.m2\repository\org\springframework\boot\spring-boot-starter-web\2.0.3.RELEASE\spring-boot-starter-web-2.0.3.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\boot\spring-boot-starter-json\2.0.3.RELEASE\spring-boot-starter-json-2.0.3.RELEASE.jar;C:\Users\litan\.m2\repository\com\fasterxml\jackson\core\jackson-databind\2.9.6\jackson-databind-2.9.6.jar;C:\Users\litan\.m2\repository\com\fasterxml\jackson\core\jackson-annotations\2.9.0\jackson-annotations-2.9.0.jar;C:\Users\litan\.m2\repository\com\fasterxml\jackson\core\jackson-core\2.9.6\jackson-core-2.9.6.jar;C:\Users\litan\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.9.6\jackson-datatype-jdk8-2.9.6.jar;C:\Users\litan\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.9.6\jackson-datatype-jsr310-2.9.6.jar;C:\Users\litan\.m2\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.9.6\jackson-module-parameter-names-2.9.6.jar;C:\Users\litan\.m2\repository\org\springframework\boot\spring-boot-starter-tomcat\2.0.3.RELEASE\spring-boot-starter-tomcat-2.0.3.RELEASE.jar;C:\Users\litan\.m2\repository\org\apache\tomcat\embed\tomcat-embed-core\8.5.31\tomcat-embed-core-8.5.31.jar;C:\Users\litan\.m2\repository\org\apache\tomcat\embed\tomcat-embed-el\8.5.31\tomcat-embed-el-8.5.31.jar;C:\Users\litan\.m2\repository\org\apache\tomcat\embed\tomcat-embed-websocket\8.5.31\tomcat-embed-websocket-8.5.31.jar;C:\Users\litan\.m2\repository\org\hibernate\validator\hibernate-validator\6.0.10.Final\hibernate-validator-6.0.10.Final.jar;C:\Users\litan\.m2\repository\javax\validation\validation-api\2.0.1.Final\validation-api-2.0.1.Final.jar;C:\Users\litan\.m2\repository\org\jboss\logging\jboss-logging\3.3.2.Final\jboss-logging-3.3.2.Final.jar;C:\Users\litan\.m2\repository\com\fasterxml\classmate\1.3.4\classmate-1.3.4.jar;C:\Users\litan\.m2\repository\org\springframework\spring-web\5.0.7.RELEASE\spring-web-5.0.7.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\spring-beans\5.0.7.RELEASE\spring-beans-5.0.7.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\spring-webmvc\5.0.7.RELEASE\spring-webmvc-5.0.7.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\spring-context\5.0.7.RELEASE\spring-context-5.0.7.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\spring-expression\5.0.7.RELEASE\spring-expression-5.0.7.RELEASE.jar;C:\Users\litan\.m2\repository\mysql\mysql-connector-java\5.1.46\mysql-connector-java-5.1.46.jar;C:\Users\litan\.m2\repository\org\springframework\spring-core\5.0.7.RELEASE\spring-core-5.0.7.RELEASE.jar;C:\Users\litan\.m2\repository\org\springframework\spring-jcl\5.0.7.RELEASE\spring-jcl-5.0.7.RELEASE.jar;C:\Users\litan\.m2\repository\io\netty\netty-all\4.1.25.Final\netty-all-4.1.25.Final.jar com.netty.example.TimeClient
  2.  22:07:35.228 [main] DEBUG io.netty.util.internal.logging.InternalLoggerFactory - Using SLF4J as the default logging framework
  3.  22:07:35.273 [main] DEBUG io.netty.channel.MultithreadEventLoopGroup - -Dio.netty.eventLoopThreads: 8
  4.  22:07:35.329 [main] DEBUG io.netty.channel.nio.NioEventLoop - -Dio.netty.noKeySetOptimization: false
  5.  22:07:35.329 [main] DEBUG io.netty.channel.nio.NioEventLoop - -Dio.netty.selectorAutoRebuildThreshold: 512
  6.  22:07:35.387 [main] DEBUG io.netty.util.internal.PlatformDependent - Platform: Windows
  7.  22:07:35.390 [main] DEBUG io.netty.util.internal.PlatformDependent0 - -Dio.netty.noUnsafe: false
  8.  22:07:35.390 [main] DEBUG io.netty.util.internal.PlatformDependent0 - Java version: 8
  9.  22:07:35.393 [main] DEBUG io.netty.util.internal.PlatformDependent0 - sun.misc.Unsafe.theUnsafe: available
  10.  22:07:35.394 [main] DEBUG io.netty.util.internal.PlatformDependent0 - sun.misc.Unsafe.copyMemory: available
  11.  22:07:35.395 [main] DEBUG io.netty.util.internal.PlatformDependent0 - java.nio.Buffer.address: available
  12.  22:07:35.396 [main] DEBUG io.netty.util.internal.PlatformDependent0 - direct buffer constructor: available
  13.  22:07:35.397 [main] DEBUG io.netty.util.internal.PlatformDependent0 - java.nio.Bits.unaligned: available, true
  14.  22:07:35.397 [main] DEBUG io.netty.util.internal.PlatformDependent0 - jdk.internal.misc.Unsafe.allocateUninitializedArray(int): unavailable prior to Java9
  15.  22:07:35.397 [main] DEBUG io.netty.util.internal.PlatformDependent0 - java.nio.DirectByteBuffer.<init>(long, int): available
  16.  22:07:35.397 [main] DEBUG io.netty.util.internal.PlatformDependent - sun.misc.Unsafe: available
  17.  22:07:35.398 [main] DEBUG io.netty.util.internal.PlatformDependent - -Dio.netty.tmpdir: C:\Users\litan\AppData\Local\Temp (java.io.tmpdir)
  18.  22:07:35.398 [main] DEBUG io.netty.util.internal.PlatformDependent - -Dio.netty.bitMode: 64 (sun.arch.data.model)
  19.  22:07:35.400 [main] DEBUG io.netty.util.internal.PlatformDependent - -Dio.netty.noPreferDirect: false
  20.  22:07:35.400 [main] DEBUG io.netty.util.internal.PlatformDependent - -Dio.netty.maxDirectMemory: 1890582528 bytes
  21.  22:07:35.400 [main] DEBUG io.netty.util.internal.PlatformDependent - -Dio.netty.uninitializedArrayAllocationThreshold: -1
  22.  22:07:35.401 [main] DEBUG io.netty.util.internal.CleanerJava6 - java.nio.ByteBuffer.cleaner(): available
  23.  22:07:35.420 [main] DEBUG io.netty.util.internal.PlatformDependent - org.jctools-core.MpscChunkedArrayQueue: available
  24.  22:07:36.030 [main] DEBUG io.netty.channel.DefaultChannelId - -Dio.netty.processId: 18472 (auto-detected)
  25.  22:07:36.032 [main] DEBUG io.netty.util.NetUtil - -Djava.net.preferIPv4Stack: false
  26.  22:07:36.033 [main] DEBUG io.netty.util.NetUtil - -Djava.net.preferIPv6Addresses: false
  27.  22:07:36.324 [main] DEBUG io.netty.util.NetUtil - Loopback interface: lo (Software Loopback Interface 1, 127.0.0.1)
  28.  22:07:36.325 [main] DEBUG io.netty.util.NetUtil - Failed to get SOMAXCONN from sysctl and file \proc\sys\net\core\somaxconn. Default: 200
  29.  22:07:36.895 [main] DEBUG io.netty.channel.DefaultChannelId - -Dio.netty.machineId: 00:50:56:ff:fe:c0:00:01 (auto-detected)
  30.  22:07:36.905 [main] DEBUG io.netty.util.internal.InternalThreadLocalMap - -Dio.netty.threadLocalMap.stringBuilder.initialSize: 1024
  31.  22:07:36.905 [main] DEBUG io.netty.util.internal.InternalThreadLocalMap - -Dio.netty.threadLocalMap.stringBuilder.maxSize: 4096
  32.  22:07:36.938 [main] DEBUG io.netty.util.ResourceLeakDetector - -Dio.netty.leakDetection.level: simple
  33.  22:07:36.938 [main] DEBUG io.netty.util.ResourceLeakDetector - -Dio.netty.leakDetection.targetRecords: 4
  34.  22:07:36.992 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.numHeapArenas: 8
  35.  22:07:36.992 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.numDirectArenas: 8
  36.  22:07:36.992 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.pageSize: 8192
  37.  22:07:36.992 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.maxOrder: 11
  38.  22:07:36.992 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.chunkSize: 16777216
  39.  22:07:36.992 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.tinyCacheSize: 512
  40.  22:07:36.992 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.smallCacheSize: 256
  41.  22:07:36.992 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.normalCacheSize: 64
  42.  22:07:36.992 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.maxCachedBufferCapacity: 32768
  43.  22:07:36.992 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.cacheTrimInterval: 8192
  44.  22:07:36.992 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.useCacheForAllThreads: true
  45.  22:07:37.029 [main] DEBUG io.netty.buffer.ByteBufUtil - -Dio.netty.allocator.type: pooled
  46.  22:07:37.029 [main] DEBUG io.netty.buffer.ByteBufUtil - -Dio.netty.threadLocalDirectBufferSize: 0
  47.  22:07:37.029 [main] DEBUG io.netty.buffer.ByteBufUtil - -Dio.netty.maxThreadLocalCharBufferSize: 16384
  48.  22:07:37.080 [nioEventLoopGroup-2-1] DEBUG io.netty.buffer.AbstractByteBuf - -Dio.netty.buffer.bytebuf.checkAccessible: true
  49.  22:07:37.084 [nioEventLoopGroup-2-1] DEBUG io.netty.util.ResourceLeakDetectorFactory - Loaded default ResourceLeakDetector: io.netty.util.ResourceLeakDetector@75655d17
  50.  22:07:37.126 [nioEventLoopGroup-2-1] DEBUG io.netty.util.Recycler - -Dio.netty.recycler.maxCapacityPerThread: 4096
  51.  22:07:37.126 [nioEventLoopGroup-2-1] DEBUG io.netty.util.Recycler - -Dio.netty.recycler.maxSharedCapacityFactor: 2
  52.  22:07:37.126 [nioEventLoopGroup-2-1] DEBUG io.netty.util.Recycler - -Dio.netty.recycler.linkCapacity: 16
  53.  22:07:37.126 [nioEventLoopGroup-2-1] DEBUG io.netty.util.Recycler - -Dio.netty.recycler.ratio: 8
  54.  Now isMon Jul 16 22:07:37 CST 2018

上面客户端最后一行是收到的服务端的应答，此时的服务端也出现了收到消息的语句，最后部分代码如下（重点是最后一行的请求消息）：

  1.  22:06:38.159 [main] DEBUG io.netty.buffer.ByteBufUtil - -Dio.netty.maxThreadLocalCharBufferSize: 16384
  2.  22:07:37.160 [nioEventLoopGroup-3-1] DEBUG io.netty.util.Recycler - -Dio.netty.recycler.maxCapacityPerThread: 4096
  3.  22:07:37.160 [nioEventLoopGroup-3-1] DEBUG io.netty.util.Recycler - -Dio.netty.recycler.maxSharedCapacityFactor: 2
  4.  22:07:37.160 [nioEventLoopGroup-3-1] DEBUG io.netty.util.Recycler - -Dio.netty.recycler.linkCapacity: 16
  5.  22:07:37.160 [nioEventLoopGroup-3-1] DEBUG io.netty.util.Recycler - -Dio.netty.recycler.ratio: 8
  6.  22:07:37.176 [nioEventLoopGroup-3-1] DEBUG io.netty.buffer.AbstractByteBuf - -Dio.netty.buffer.bytebuf.checkAccessible: true
  7.  22:07:37.179 [nioEventLoopGroup-3-1] DEBUG io.netty.util.ResourceLeakDetectorFactory - Loaded default ResourceLeakDetector: io.netty.util.ResourceLeakDetector@164ea267
  8.  The time server receive order:QUERY TIME ORDER

运行OK！

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