项目中需要使用到TCP/IP协议完成数据的发送与接收。如果只是用以前写的简单的socket套接字方法，每次接收发送消息都会创建新的socket再关闭socket，造成资源浪费。于是使用netty框架完成java网络通信。
Netty框架的内容很多，这里只是代码展示其中的一个功能。
这里使用的是Springboot+Netty框架，使用maven搭建项目。这里是在一个项目中搭建服务端与客户端，所以端口一样。还可以使用TCP/UTP工具自己搭建服务端和客户端，只要在yml文件中修改ip和端口就好。
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.hzx.testmaven15netty</groupId>
<artifactId>testmaven15netty</artifactId>
<version>1.0-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.0.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-all</artifactId>
<version>4.1.31.Final</version>
</dependency>
</dependencies>
</project>application.yml
server:
port: 8080
# 作为客户端请求的服务端地址
netty:
tcp:
server:
# 作为客户端请求的服务端地址
host: 127.0.0.1
# 作为客户端请求的服务端端口
port: 7000
client:
# 作为服务端开放给客户端的端口
port: 7000服务端
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.util.concurrent.Future;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
@Component
public class NettyTcpServer {
private static final Logger LOGGER = LoggerFactory.getLogger(NettyTcpServer.class);
// boss事件轮询线程组
// 处理Accept连接事件的线程，这里线程数设置为1即可，netty处理链接事件默认为单线程，过度设置反而浪费cpu资源
private EventLoopGroup boss = new NioEventLoopGroup(1);
//worker事件轮询线程组
//处理handler的工作线程，其实也就是处理IO读写 。线程数据默认为 CPU 核心数乘以2
private EventLoopGroup worker = new NioEventLoopGroup();
@Autowired
ServerChannelInitializer serverChannelInitializer;
@Value("${netty.tcp.client.port}")
private Integer port;
// 与客户端建立连接后得到的通道对象
private Channel channel;
/**
* 存储client的channel
* key:ip value:Channel
*/
public static Map<String, Channel> map = new ConcurrentHashMap<String, Channel>();
/**
* 开启Netty tcp server服务
*
* @return
*/
public ChannelFuture start() {
// 启动类
ServerBootstrap serverBootstrap = new ServerBootstrap();
serverBootstrap.group(boss, worker)//组配置，初始化ServerBootstrap的线程组
.channel(NioServerSocketChannel.class)//构造channel通道工厂 bossGroup的通道，只是负责连接
.childHandler(serverChannelInitializer) //设置通道处理者ChannelHandlerWorkerGroup的处理器
.option(ChannelOption.SO_BACKLOG, 1024)//socket参数，当服务器请求处理程全满时，用于临时存放已完成三次握手请求的队列的最大长度。如果未设置或所设置的值小于1，Java将使用默认值50。
.childOption(ChannelOption.SO_KEEPALIVE, true);//启用心跳保活机制，tcp，默认2小时发一次心跳
//Future：异步任务的生命周期，可用来获取任务结果
ChannelFuture channelFuture1 = serverBootstrap.bind(port).syncUninterruptibly(); // 绑定端口 开启监听 同步等待
if (channelFuture1 != null && channelFuture1.isSuccess()) {
channel = channelFuture1.channel();// 获取通道
LOGGER.info("Netty tcp server start success,port={}",port);
}else {
LOGGER.error("Netty tcp server start fail");
}
return channelFuture1;
}
/**
* 停止Netty tcp server服务
*/
public void destroy(){
if (channel != null) {
channel.close();
}
try {
Future<?> future = worker.shutdownGracefully().await();
if (!future.isSuccess()) {
LOGGER.error("netty tcp workerGroup shutdown fail,{}",future.cause());
}
} catch (InterruptedException e) {
LOGGER.error(e.toString());
}
LOGGER.info("Netty tcp server shutdown success");
}
}import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import io.netty.handler.timeout.IdleStateHandler;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import java.util.concurrent.TimeUnit;
@Component
public class ServerChannelInitializer extends ChannelInitializer<SocketChannel> {
@Autowired
ServerChannelHandler serverChannelHandler;
@Override
protected void initChannel(SocketChannel socketChannel) throws Exception {
ChannelPipeline pipeline = socketChannel.pipeline();
//IdleStateHandler心跳机制,如果超时触发Handle中userEventTrigger()方法
pipeline.addLast("idleStateHandler",
new IdleStateHandler(15,0,0, TimeUnit.MINUTES));
// 字符串编解码器
pipeline.addLast(
new StringDecoder(),
new StringEncoder()
);
// 自定义Handler
pipeline.addLast("serverChannelHandler",serverChannelHandler);
}
}import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.timeout.IdleState;
import io.netty.handler.timeout.IdleStateEvent;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
@Component
@ChannelHandler.Sharable
public class ServerChannelHandler extends SimpleChannelInboundHandler<Object> {
private static final Logger LOGGER = LoggerFactory.getLogger(ServerChannelHandler.class);
/**
* 拿到传过来的msg数据，开始处理
* @param channelHandlerContext
* @param msg
* @throws Exception
*/
@Override
protected void channelRead0(ChannelHandlerContext channelHandlerContext, Object msg) throws Exception {
LOGGER.info("Netty tcp server receive message: {}",msg);
channelHandlerContext.writeAndFlush(" response message "+msg).syncUninterruptibly();
}
/**
* 活跃的、有效的通道
* 第一次连接成功后进入的方法
* @param ctx
* @throws Exception
*/
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
super.channelActive(ctx);
LOGGER.info("tcp client "+getRemoteAddress(ctx)+" connect success");
NettyTcpServer.map.put(getIPString(ctx),ctx.channel());
}
/**
* 不活动的通道
* 连接丢失后执行的方法（client端可据此实现断线重连）
* @param ctx
* @throws Exception
*/
@Override
public void channelInactive(ChannelHandlerContext ctx) throws Exception {
// 删除Channel Map中失效的Client
NettyTcpServer.map.remove(getIPString(ctx));
ctx.close();
}
/**
* 异常处理
* @param ctx
* @param cause
* @throws Exception
*/
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
super.exceptionCaught(ctx, cause);
// 发生异常 关闭连接
LOGGER.error("引擎{}的通道发生异常，断开连接",getRemoteAddress(ctx));
ctx.close();
}
/**
* 心跳机制 超时处理
* @param ctx
* @param evt
* @throws Exception
*/
@Override
public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
String socketString = ctx.channel().remoteAddress().toString();
if (evt instanceof IdleStateEvent) {
IdleStateEvent event = (IdleStateEvent) evt;
if (event.state()== IdleState.READER_IDLE) {
LOGGER.info("Client: "+socketString+" READER_IDLE读超时");
ctx.disconnect();
}else if (event.state()==IdleState.WRITER_IDLE){
LOGGER.info("Client: "+socketString+" WRITER_IDLE写超时");
ctx.disconnect();
}else if (event.state()==IdleState.ALL_IDLE){
LOGGER.info("Client: "+socketString+" ALL_IDLE总超时");
ctx.disconnect();
}
}
}
/**
* 获取client对象：ip+port
* @param channelHandlerContext
* @return
*/
public String getRemoteAddress(ChannelHandlerContext channelHandlerContext){
String socketString = "";
socketString = channelHandlerContext.channel().remoteAddress().toString();
return socketString;
}
/**
* 获取client的ip
* @param channelHandlerContext
* @return
*/
public String getIPString(ChannelHandlerContext channelHandlerContext){
String ipString = "";
String socketString = channelHandlerContext.channel().remoteAddress().toString();
int colonAt = socketString.indexOf(":");
ipString = socketString.substring(1,colonAt);
return ipString;
}
}客户端
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelOption;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioSocketChannel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import javax.xml.ws.Holder;
@Component
public class NettyTcpClient {
private static final Logger LOGGER = LoggerFactory.getLogger(NettyTcpClient.class);
@Value("${netty.tcp.server.host}")
String HOST;
@Value("${netty.tcp.server.port}")
int PORT;
@Autowired
ClientChannelInitializer clientChannelInitializer;
private Channel channel;
/**
* 初始化 `Bootstrap` 客户端引导程序
* @return
*/
private final Bootstrap getBootstrap(){
Bootstrap bootstrap = new Bootstrap();
NioEventLoopGroup group = new NioEventLoopGroup();
bootstrap.group(group)
.channel(NioSocketChannel.class)//通道连接者
.handler(clientChannelInitializer)//通道处理者
.option(ChannelOption.SO_KEEPALIVE,true);// 心跳报活
return bootstrap;
}
/**
* 建立连接，获取连接通道对象
*/
public void connect(){
ChannelFuture channelFuture = getBootstrap().connect(HOST, PORT).syncUninterruptibly();
if (channelFuture != null&&channelFuture.isSuccess()) {
channel = channelFuture.channel();
LOGGER.info("connect tcp server host = {},port = {} success", HOST,PORT);
}else {
LOGGER.error("connect tcp server host = {},port = {} fail",HOST,PORT);
}
}
/**
* 向服务器发送消息
*/
public void sendMessage(Object msg) throws InterruptedException {
if (channel != null) {
channel.writeAndFlush(msg).sync();
}else {
LOGGER.warn("消息发送失败，连接尚未建立");
}
}
}import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import io.netty.handler.timeout.IdleStateHandler;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import java.util.concurrent.TimeUnit;
@Component
public class ClientChannelInitializer extends ChannelInitializer<SocketChannel> {
@Autowired
ClientChannelHandler clientChannelHandler;
@Override
protected void initChannel(SocketChannel socketChannel) throws Exception {
ChannelPipeline pipeline = socketChannel.pipeline();
pipeline.addLast("idleStateHandler",
new IdleStateHandler(15,0,0, TimeUnit.MINUTES));
pipeline.addLast(new StringDecoder(),new StringEncoder());
pipeline.addLast("clientChannelHandler",clientChannelHandler);
}
}import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
@Component
@ChannelHandler.Sharable
public class ClientChannelHandler extends SimpleChannelInboundHandler<Object> {
private static final Logger LOGGER = LoggerFactory.getLogger(ClientChannelHandler.class);
@Override
protected void channelRead0(ChannelHandlerContext channelHandlerContext, Object msg) throws Exception {
LOGGER.info("Netty tcp client receive msg : " + msg);
}
}启动类
import com.netty.client.NettyTcpClient;
import com.netty.server.NettyTcpServer;
import io.netty.channel.ChannelFuture;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class StartApplication implements CommandLineRunner {
public static void main(String[] args) throws Exception {
SpringApplication.run(StartApplication.class, args);
}
@Autowired
NettyTcpServer nettyTcpServer;
@Autowired
NettyTcpClient nettyTcpClient;
/**
* Callback used to run the bean.
*
* @param args incoming main method arguments
* @throws Exception on error
*/
@Override
public void run(String... args) throws Exception {
ChannelFuture start = nettyTcpServer.start();
nettyTcpClient.connect();
for (int i = 0; i < 10; i++) {
nettyTcpClient.sendMessage("hello world "+i);
}
start.channel().closeFuture().syncUninterruptibly();
}
}使用循环让客户端向服务端发送10条数据
运行结果
"C:\Program Files\Java\jdk1.8.0_271\bin\java.exe" -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dspring.jmx.enabled=true -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true "-javaagent:D:\IDEA\IntelliJ IDEA 2019.1.1\lib\idea_rt.jar=62789:D:\IDEA\IntelliJ IDEA 2019.1.1\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_271\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\ext\sqljdbc4-4.0.0.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\rt.jar;D:\Java Code\testmaven15netty\target\classes;D:\Maven\myreprository\org\springframework\boot\spring-boot-starter\2.3.0.RELEASE\spring-boot-starter-2.3.0.RELEASE.jar;D:\Maven\myreprository\org\springframework\boot\spring-boot\2.3.0.RELEASE\spring-boot-2.3.0.RELEASE.jar;D:\Maven\myreprository\org\springframework\spring-context\5.2.6.RELEASE\spring-context-5.2.6.RELEASE.jar;D:\Maven\myreprository\org\springframework\spring-aop\5.2.6.RELEASE\spring-aop-5.2.6.RELEASE.jar;D:\Maven\myreprository\org\springframework\spring-beans\5.2.6.RELEASE\spring-beans-5.2.6.RELEASE.jar;D:\Maven\myreprository\org\springframework\spring-expression\5.2.6.RELEASE\spring-expression-5.2.6.RELEASE.jar;D:\Maven\myreprository\org\springframework\boot\spring-boot-autoconfigure\2.3.0.RELEASE\spring-boot-autoconfigure-2.3.0.RELEASE.jar;D:\Maven\myreprository\org\springframework\boot\spring-boot-starter-logging\2.3.0.RELEASE\spring-boot-starter-logging-2.3.0.RELEASE.jar;D:\Maven\myreprository\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;D:\Maven\myreprository\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;D:\Maven\myreprository\org\slf4j\slf4j-api\1.7.30\slf4j-api-1.7.30.jar;D:\Maven\myreprository\org\apache\logging\log4j\log4j-to-slf4j\2.13.2\log4j-to-slf4j-2.13.2.jar;D:\Maven\myreprository\org\apache\logging\log4j\log4j-api\2.13.2\log4j-api-2.13.2.jar;D:\Maven\myreprository\org\slf4j\jul-to-slf4j\1.7.30\jul-to-slf4j-1.7.30.jar;D:\Maven\myreprository\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;D:\Maven\myreprository\org\springframework\spring-core\5.2.6.RELEASE\spring-core-5.2.6.RELEASE.jar;D:\Maven\myreprository\org\springframework\spring-jcl\5.2.6.RELEASE\spring-jcl-5.2.6.RELEASE.jar;D:\Maven\myreprository\org\yaml\snakeyaml\1.26\snakeyaml-1.26.jar;D:\Maven\myreprository\io\netty\netty-all\4.1.31.Final\netty-all-4.1.31.Final.jar" com.netty.StartApplication
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.3.0.RELEASE)
2021-07-13 08:32:17.161 INFO 18068 --- [ main] com.netty.StartApplication : Starting StartApplication on LAPTOP-H9JFQJGF with PID 18068 (D:\Java Code\testmaven15netty\target\classes started by huangzixiao in D:\Java Code\testmaven15netty)
2021-07-13 08:32:17.165 INFO 18068 --- [ main] com.netty.StartApplication : No active profile set, falling back to default profiles: default
2021-07-13 08:32:18.371 INFO 18068 --- [ main] com.netty.StartApplication : Started StartApplication in 1.706 seconds (JVM running for 2.672)
2021-07-13 08:32:18.931 INFO 18068 --- [ main] com.netty.server.NettyTcpServer : Netty tcp server start success,port=7000
2021-07-13 08:32:19.016 INFO 18068 --- [ main] com.netty.client.NettyTcpClient : connect tcp server host = 127.0.0.1,port = 7000 success
2021-07-13 08:32:19.078 INFO 18068 --- [ntLoopGroup-3-1] com.netty.server.ServerChannelHandler : tcp client /127.0.0.1:52653 connect success
2021-07-13 08:32:19.100 INFO 18068 --- [ntLoopGroup-3-1] com.netty.server.ServerChannelHandler : Netty tcp server receive message: hello world 0
2021-07-13 08:32:19.100 INFO 18068 --- [ntLoopGroup-3-1] com.netty.server.ServerChannelHandler : Netty tcp server receive message: hello world 1
2021-07-13 08:32:19.100 INFO 18068 --- [ntLoopGroup-4-1] com.netty.client.ClientChannelHandler : Netty tcp client receive msg : response message hello world 0
2021-07-13 08:32:19.100 INFO 18068 --- [ntLoopGroup-3-1] com.netty.server.ServerChannelHandler : Netty tcp server receive message: hello world 2
2021-07-13 08:32:19.100 INFO 18068 --- [ntLoopGroup-4-1] com.netty.client.ClientChannelHandler : Netty tcp client receive msg : response message hello world 1
2021-07-13 08:32:19.100 INFO 18068 --- [ntLoopGroup-3-1] com.netty.server.ServerChannelHandler : Netty tcp server receive message: hello world 3
2021-07-13 08:32:19.100 INFO 18068 --- [ntLoopGroup-4-1] com.netty.client.ClientChannelHandler : Netty tcp client receive msg : response message hello world 2
2021-07-13 08:32:19.100 INFO 18068 --- [ntLoopGroup-3-1] com.netty.server.ServerChannelHandler : Netty tcp server receive message: hello world 4
2021-07-13 08:32:19.100 INFO 18068 --- [ntLoopGroup-4-1] com.netty.client.ClientChannelHandler : Netty tcp client receive msg : response message hello world 3
2021-07-13 08:32:19.104 INFO 18068 --- [ntLoopGroup-3-1] com.netty.server.ServerChannelHandler : Netty tcp server receive message: hello world 5
2021-07-13 08:32:19.104 INFO 18068 --- [ntLoopGroup-4-1] com.netty.client.ClientChannelHandler : Netty tcp client receive msg : response message hello world 4
2021-07-13 08:32:19.104 INFO 18068 --- [ntLoopGroup-3-1] com.netty.server.ServerChannelHandler : Netty tcp server receive message: hello world 6
2021-07-13 08:32:19.104 INFO 18068 --- [ntLoopGroup-4-1] com.netty.client.ClientChannelHandler : Netty tcp client receive msg : response message hello world 5
2021-07-13 08:32:19.104 INFO 18068 --- [ntLoopGroup-3-1] com.netty.server.ServerChannelHandler : Netty tcp server receive message: hello world 7
2021-07-13 08:32:19.104 INFO 18068 --- [ntLoopGroup-4-1] com.netty.client.ClientChannelHandler : Netty tcp client receive msg : response message hello world 6 response message hello world 7
2021-07-13 08:32:19.104 INFO 18068 --- [ntLoopGroup-3-1] com.netty.server.ServerChannelHandler : Netty tcp server receive message: hello world 8
2021-07-13 08:32:19.104 INFO 18068 --- [ntLoopGroup-4-1] com.netty.client.ClientChannelHandler : Netty tcp client receive msg : response message hello world 8
2021-07-13 08:32:19.104 INFO 18068 --- [ntLoopGroup-3-1] com.netty.server.ServerChannelHandler : Netty tcp server receive message: hello world 9
2021-07-13 08:32:19.104 INFO 18068 --- [ntLoopGroup-4-1] com.netty.client.ClientChannelHandler : Netty tcp client receive msg : response message hello world 9
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