开始 Netty 入门示例

lab-67/lab-67-netty-demo/lab-67-netty-demo-client/pom.xml

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+<?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">
+    <parent>
+        <artifactId>lab-67-netty-demo</artifactId>
+        <groupId>cn.iocoder.springboot.labs</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>lab-67-netty-demo-client</artifactId>
+
+    <properties>
+        <!-- 依赖相关配置 -->
+        <spring.boot.version>2.2.4.RELEASE</spring.boot.version>
+        <!-- 插件相关配置 -->
+        <maven.compiler.target>1.8</maven.compiler.target>
+        <maven.compiler.source>1.8</maven.compiler.source>
+    </properties>
+
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-starter-parent</artifactId>
+                <version>${spring.boot.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+    <dependencies>
+        <!-- 实现对 Spring MVC 的自动化配置 -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+
+        <!-- Netty 依赖 -->
+        <dependency>
+            <groupId>io.netty</groupId>
+            <artifactId>netty-all</artifactId>
+            <version>4.1.50.Final</version>
+        </dependency>
+
+        <!-- 引入 netty-demo-common 封装 -->
+        <dependency>
+            <groupId>cn.iocoder.springboot.labs</groupId>
+            <artifactId>lab-67-netty-demo-common</artifactId>
+            <version>1.0-SNAPSHOT</version>
+        </dependency>
+    </dependencies>
+
+</project>

lab-67/lab-67-netty-demo/lab-67-netty-demo-client/src/main/java/cn/iocoder/springboot/lab67/nettyclientdemo/NettyClientApplication.java

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+package cn.iocoder.springboot.lab67.nettyclientdemo;
+
+public class NettyClientApplication {
+}

lab-67/lab-67-netty-demo/lab-67-netty-demo-client/src/main/java/cn/iocoder/springboot/lab67/nettyclientdemo/config/NettyClientConfig.java

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+package cn.iocoder.springboot.lab67.nettyclientdemo.config;
+
+import cn.iocoder.springboot.lab67.nettycommondemo.dispacher.MessageDispatcher;
+import cn.iocoder.springboot.lab67.nettycommondemo.dispacher.MessageHandlerContainer;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class NettyClientConfig {
+
+    @Bean
+    public MessageDispatcher messageDispatcher() {
+        return new MessageDispatcher();
+    }
+
+    @Bean
+    public MessageHandlerContainer messageHandlerContainer() {
+        return new MessageHandlerContainer();
+    }
+
+}

lab-67/lab-67-netty-demo/lab-67-netty-demo-common/pom.xml

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+<?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">
+    <parent>
+        <artifactId>lab-67-netty-demo</artifactId>
+        <groupId>cn.iocoder.springboot.labs</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>lab-67-netty-demo-common</artifactId>
+
+    <properties>
+        <!-- 插件相关配置 -->
+        <maven.compiler.target>1.8</maven.compiler.target>
+        <maven.compiler.source>1.8</maven.compiler.source>
+    </properties>
+
+    <dependencies>
+        <!-- Netty 依赖 -->
+        <dependency>
+            <groupId>io.netty</groupId>
+            <artifactId>netty-all</artifactId>
+            <version>4.1.50.Final</version>
+        </dependency>
+
+        <!-- FastJSON 依赖 -->
+        <dependency>
+            <groupId>com.alibaba</groupId>
+            <artifactId>fastjson</artifactId>
+            <version>1.2.71</version>
+        </dependency>
+
+        <!-- 引入 Spring 相关依赖 -->
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-aop</artifactId>
+            <version>5.2.5.RELEASE</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-context</artifactId>
+            <version>5.2.5.RELEASE</version>
+        </dependency>
+
+        <!-- 引入 SLF4J 依赖 -->
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>1.7.30</version>
+        </dependency>
+    </dependencies>
+
+</project>

lab-67/lab-67-netty-demo/lab-67-netty-demo-common/src/main/java/cn/iocoder/springboot/lab67/nettycommondemo/codec/Invocation.java

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+package cn.iocoder.springboot.lab67.nettycommondemo.codec;
+
+public class Invocation {
+
+    /**
+     * 类型 - 心跳请求
+     */
+    public static final String TYPE_HEARTBEAT_REQUEST = "HEARTBEAT_REQUEST";
+    /**
+     * 类型 - 心跳响应
+     */
+    public static final String TYPE_HEARTBEAT_RESPONSE = "HEARTBEAT_RESPONSE";
+
+    /**
+     * 类型
+     */
+    private String type;
+    /**
+     * 消息
+     */
+    private String message;
+
+    public String getType() {
+        return type;
+    }
+
+    public Invocation setType(String type) {
+        this.type = type;
+        return this;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+
+    public Invocation setMessage(String message) {
+        this.message = message;
+        return this;
+    }
+
+}

lab-67/lab-67-netty-demo/lab-67-netty-demo-common/src/main/java/cn/iocoder/springboot/lab67/nettycommondemo/codec/InvocationDecoder.java

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+package cn.iocoder.springboot.lab67.nettycommondemo.codec;
+
+import com.alibaba.fastjson.JSON;
+import io.netty.buffer.ByteBuf;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.handler.codec.ByteToMessageDecoder;
+import io.netty.handler.codec.CorruptedFrameException;
+
+import java.util.List;
+
+public class InvocationDecoder extends ByteToMessageDecoder {
+
+    @Override
+    protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) {
+        // 标记当前读取位置
+        in.markReaderIndex();
+        // 判断是否能够读取 length 长度
+        if (in.readableBytes() <= 4) {
+            return;
+        }
+        // 读取长度
+        int length = in.readInt();
+        if (length < 0) {
+            throw new CorruptedFrameException("negative length: " + length);
+        }
+        // 如果 message 不够可读，则退回到原读取位置
+        if (in.readableBytes() < length) {
+            in.resetReaderIndex();
+            return;
+        }
+        // 读取内容
+        ByteBuf byteBuf = in.readRetainedSlice(length);
+        // 解析成 Invocation
+        byte[] content = byteBuf.array();
+        Invocation invocation = JSON.parseObject(content, Invocation.class);
+        out.add(invocation);
+    }
+
+}

lab-67/lab-67-netty-demo/lab-67-netty-demo-common/src/main/java/cn/iocoder/springboot/lab67/nettycommondemo/codec/InvocationEncoder.java

@@ -0,0 +1,20 @@
+package cn.iocoder.springboot.lab67.nettycommondemo.codec;
+
+import com.alibaba.fastjson.JSON;
+import io.netty.buffer.ByteBuf;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.handler.codec.MessageToByteEncoder;
+
+public class InvocationEncoder extends MessageToByteEncoder<Invocation> {
+
+    @Override
+    protected void encode(ChannelHandlerContext ctx, Invocation invocation, ByteBuf out) {
+        // 将 Invocation 转换成 byte[] 数组
+        byte[] content = JSON.toJSONBytes(invocation);
+        // 写入 length
+        out.writeInt(content.length);
+        // 写入内容
+        out.writeBytes(content);
+    }
+
+}

lab-67/lab-67-netty-demo/lab-67-netty-demo-common/src/main/java/cn/iocoder/springboot/lab67/nettycommondemo/dispacher/Message.java

@@ -0,0 +1,4 @@
+package cn.iocoder.springboot.lab67.nettycommondemo.dispacher;
+
+public interface Message {
+}

lab-67/lab-67-netty-demo/lab-67-netty-demo-common/src/main/java/cn/iocoder/springboot/lab67/nettycommondemo/dispacher/MessageDispatcher.java

@@ -0,0 +1,28 @@
+package cn.iocoder.springboot.lab67.nettycommondemo.dispacher;
+
+import cn.iocoder.springboot.lab67.nettycommondemo.codec.Invocation;
+import com.alibaba.fastjson.JSON;
+import io.netty.channel.ChannelHandler;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.SimpleChannelInboundHandler;
+import org.springframework.beans.factory.annotation.Autowired;
+
+@ChannelHandler.Sharable
+public class MessageDispatcher extends SimpleChannelInboundHandler<Invocation> {
+
+    @Autowired
+    private MessageHandlerContainer messageHandlerContainer;
+
+    @Override
+    protected void channelRead0(ChannelHandlerContext ctx, Invocation invocation) {
+        // 获得 type 对应的 MessageHandler 处理器
+        MessageHandler messageHandler = messageHandlerContainer.getMessageHandler(invocation.getType());
+        // 解析消息
+        Class<? extends Message> messageClass = MessageHandlerContainer.getMessageClass(messageHandler);
+        Message message = JSON.parseObject(invocation.getMessage(), messageClass);
+        // 执行逻辑
+        // noinspection unchecked
+        messageHandler.execute(ctx.channel(), message);
+    }
+
+}

lab-67/lab-67-netty-demo/lab-67-netty-demo-common/src/main/java/cn/iocoder/springboot/lab67/nettycommondemo/dispacher/MessageHandler.java

@@ -0,0 +1,20 @@
+package cn.iocoder.springboot.lab67.nettycommondemo.dispacher;
+
+import io.netty.channel.Channel;
+
+public interface MessageHandler<T extends Message> {
+
+    /**
+     * 执行处理消息
+     *
+     * @param channel 通道
+     * @param message 消息
+     */
+    void execute(Channel channel, T message);
+
+    /**
+     * @return 消息类型，即每个 Message 实现类上的 TYPE 静态字段
+     */
+    String getType();
+
+}

lab-67/lab-67-netty-demo/lab-67-netty-demo-common/src/main/java/cn/iocoder/springboot/lab67/nettycommondemo/dispacher/MessageHandlerContainer.java

@@ -0,0 +1,76 @@
+package cn.iocoder.springboot.lab67.nettycommondemo.dispacher;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.aop.framework.AopProxyUtils;
+import org.springframework.beans.factory.InitializingBean;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.ApplicationContext;
+
+import java.lang.reflect.ParameterizedType;
+import java.lang.reflect.Type;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+
+public class MessageHandlerContainer implements InitializingBean {
+
+    private Logger logger = LoggerFactory.getLogger(getClass());
+
+    /**
+     * 消息类型与 MessageHandler 的映射
+     */
+    private final Map<String, MessageHandler> handlers = new HashMap<>();
+
+    @Autowired
+    private ApplicationContext applicationContext;
+
+    @Override
+    public void afterPropertiesSet() throws Exception {
+        // 通过 ApplicationContext 获得所有 MessageHandler Bean
+        applicationContext.getBeansOfType(MessageHandler.class).values() // 获得所有 MessageHandler Bean
+                .forEach(messageHandler -> handlers.put(messageHandler.getType(), messageHandler)); // 添加到 handlers 中
+        logger.info("[afterPropertiesSet][消息处理器数量：{}]", handlers.size());
+    }
+
+    protected MessageHandler getMessageHandler(String type) {
+        MessageHandler handler = handlers.get(type);
+        if (handler == null) {
+            throw new IllegalArgumentException(String.format("类型(%s) 找不到匹配的 MessageHandler 处理器", type));
+        }
+        return handler;
+    }
+
+    public static Class<? extends Message> getMessageClass(MessageHandler handler) {
+        // 获得 Bean 对应的 Class 类名。因为有可能被 AOP 代理过。
+        Class<?> targetClass = AopProxyUtils.ultimateTargetClass(handler);
+        // 获得接口的 Type 数组
+        Type[] interfaces = targetClass.getGenericInterfaces();
+        Class<?> superclass = targetClass.getSuperclass();
+        while ((Objects.isNull(interfaces) || 0 == interfaces.length) && Objects.nonNull(superclass)) { // 此处，是以父类的接口为准
+            interfaces = superclass.getGenericInterfaces();
+            superclass = targetClass.getSuperclass();
+        }
+        if (Objects.nonNull(interfaces)) {
+            // 遍历 interfaces 数组
+            for (Type type : interfaces) {
+                // 要求 type 是泛型参数
+                if (type instanceof ParameterizedType) {
+                    ParameterizedType parameterizedType = (ParameterizedType) type;
+                    // 要求是 MessageHandler 接口
+                    if (Objects.equals(parameterizedType.getRawType(), MessageHandler.class)) {
+                        Type[] actualTypeArguments = parameterizedType.getActualTypeArguments();
+                        // 取首个元素
+                        if (Objects.nonNull(actualTypeArguments) && actualTypeArguments.length > 0) {
+                            return (Class<Message>) actualTypeArguments[0];
+                        } else {
+                            throw new IllegalStateException(String.format("类型(%s) 获得不到消息类型", handler));
+                        }
+                    }
+                }
+            }
+        }
+        throw new IllegalStateException(String.format("类型(%s) 获得不到消息类型", handler));
+    }
+
+}

lab-67/lab-67-netty-demo/lab-67-netty-demo-server/pom.xml

@@ -0,0 +1,56 @@
+<?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">
+    <parent>
+        <artifactId>lab-67-netty-demo</artifactId>
+        <groupId>cn.iocoder.springboot.labs</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>lab-67-netty-demo-server</artifactId>
+
+    <properties>
+        <!-- 依赖相关配置 -->
+        <spring.boot.version>2.2.4.RELEASE</spring.boot.version>
+        <!-- 插件相关配置 -->
+        <maven.compiler.target>1.8</maven.compiler.target>
+        <maven.compiler.source>1.8</maven.compiler.source>
+    </properties>
+
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-starter-parent</artifactId>
+                <version>${spring.boot.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+    <dependencies>
+        <!-- Spring Boot 基础依赖 -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter</artifactId>
+        </dependency>
+
+        <!-- Netty 依赖 -->
+        <dependency>
+            <groupId>io.netty</groupId>
+            <artifactId>netty-all</artifactId>
+            <version>4.1.50.Final</version>
+        </dependency>
+
+        <!-- 引入 netty-demo-common 封装 -->
+        <dependency>
+            <groupId>cn.iocoder.springboot.labs</groupId>
+            <artifactId>lab-67-netty-demo-common</artifactId>
+            <version>1.0-SNAPSHOT</version>
+        </dependency>
+    </dependencies>
+
+</project>

lab-67/lab-67-netty-demo/lab-67-netty-demo-server/src/main/java/cn/iocoder/springboot/lab67/nettyserverdemo/NettyServerApplication.java

@@ -0,0 +1,13 @@
+package cn.iocoder.springboot.lab67.nettyserverdemo;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class NettyServerApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(NettyServerApplication.class, args);
+    }
+
+}

lab-67/lab-67-netty-demo/lab-67-netty-demo-server/src/main/java/cn/iocoder/springboot/lab67/nettyserverdemo/config/NettyServerConfig.java

@@ -0,0 +1,21 @@
+package cn.iocoder.springboot.lab67.nettyserverdemo.config;
+
+import cn.iocoder.springboot.lab67.nettycommondemo.dispacher.MessageDispatcher;
+import cn.iocoder.springboot.lab67.nettycommondemo.dispacher.MessageHandlerContainer;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class NettyServerConfig {
+
+    @Bean
+    public MessageDispatcher messageDispatcher() {
+        return new MessageDispatcher();
+    }
+
+    @Bean
+    public MessageHandlerContainer messageHandlerContainer() {
+        return new MessageHandlerContainer();
+    }
+
+}

lab-67/lab-67-netty-demo/lab-67-netty-demo-server/src/main/java/cn/iocoder/springboot/lab67/nettyserverdemo/server/NettyServer.java

@@ -0,0 +1,80 @@
+package cn.iocoder.springboot.lab67.nettyserverdemo.server;
+
+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 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.annotation.PostConstruct;
+import javax.annotation.PreDestroy;
+import java.net.InetSocketAddress;
+
+@Component
+public class NettyServer {
+
+    private Logger logger = LoggerFactory.getLogger(getClass());
+
+    @Value("${netty.port}")
+    private Integer port;
+
+    @Autowired
+    private NettyServerHandlerInitializer nettyServerHandlerInitializer;
+
+    /**
+     * boss 线程组，用于服务端接受客户端的连接
+     */
+    private EventLoopGroup bossGroup = new NioEventLoopGroup();
+    /**
+     * worker 线程组，用于服务端接受客户端的数据读写
+     */
+    private EventLoopGroup workerGroup = new NioEventLoopGroup();
+    /**
+     * Netty Server Channel
+     */
+    private Channel channel;
+
+    /**
+     * 启动 Netty Server
+     */
+    @PostConstruct
+    public void start() throws InterruptedException {
+        // 创建 ServerBootstrap 对象，用于 Netty Server 启动
+        ServerBootstrap bootstrap = new ServerBootstrap();
+        bootstrap.group(bossGroup, workerGroup) // 设置两个 EventLoopGroup 对象
+                .channel(NioServerSocketChannel.class)  // 指定 Channel 为服务端 NioServerSocketChannel
+                .localAddress(new InetSocketAddress(port)) // 设置 Netty Server 的端口
+                .option(ChannelOption.SO_BACKLOG, 1024) // 服务端 accept 队列的大小
+                .childOption(ChannelOption.SO_KEEPALIVE, true) // TCP Keepalive 机制，实现 TCP 层级的心跳保活功能
+                .childOption(ChannelOption.TCP_NODELAY, true) // 允许较小的数据包的发送，降低延迟
+                .childHandler(nettyServerHandlerInitializer);
+        // 绑定端口，并同步等待成功，即启动服务端
+        ChannelFuture future = bootstrap.bind().sync();
+        if (future.isSuccess()) {
+            channel = future.channel();
+            logger.info("[start][Netty Server 启动在 {} 端口]", port);
+        }
+    }
+
+    /**
+     * 关闭 Netty Server
+     */
+    @PreDestroy
+    public void shutdown() {
+        // 关闭 Netty Server
+        if (channel != null) {
+            channel.close();
+        }
+        // 优雅关闭两个 EventLoopGroup 对象
+        bossGroup.shutdownGracefully();
+        workerGroup.shutdownGracefully();
+    }
+
+}

lab-67/lab-67-netty-demo/lab-67-netty-demo-server/src/main/java/cn/iocoder/springboot/lab67/nettyserverdemo/server/NettyServerHandlerInitializer.java

@@ -0,0 +1,31 @@
+package cn.iocoder.springboot.lab67.nettyserverdemo.server;
+
+import cn.iocoder.springboot.lab67.nettycommondemo.codec.InvocationDecoder;
+import cn.iocoder.springboot.lab67.nettycommondemo.codec.InvocationEncoder;
+import cn.iocoder.springboot.lab67.nettycommondemo.dispacher.MessageDispatcher;
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelInitializer;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+@Component
+public class NettyServerHandlerInitializer extends ChannelInitializer<Channel> {
+
+    @Autowired
+    private MessageDispatcher messageDispatcher;
+
+    @Override
+    protected void initChannel(Channel ch) throws Exception {
+        ch.pipeline()
+                // 空闲检测
+//                .addLast(new ServerIdleStateHandler())
+                // 编码器
+                .addLast(new InvocationEncoder())
+                // 解码器
+                .addLast(new InvocationDecoder())
+                // 服务端处理器
+                .addLast(messageDispatcher)
+        ;
+    }
+
+}

lab-67/lab-67-netty-demo/lab-67-netty-demo-server/src/main/resources/application.yml

@@ -0,0 +1,2 @@
+netty:
+  port: 8888 # Netty Server 端口

lab-67/lab-67-netty-demo/pom.xml

@@ -0,0 +1,21 @@
+<?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">
+    <parent>
+        <artifactId>lab-67</artifactId>
+        <groupId>cn.iocoder.springboot.labs</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>lab-67-netty-demo</artifactId>
+    <packaging>pom</packaging>
+    <modules>
+        <module>lab-67-netty-demo-server</module>
+        <module>lab-67-netty-demo-client</module>
+        <module>lab-67-netty-demo-common</module>
+    </modules>
+
+
+</project>

lab-67/pom.xml

@@ -0,0 +1,19 @@
+<?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">
+    <parent>
+        <artifactId>labs-parent</artifactId>
+        <groupId>cn.iocoder.springboot.labs</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>lab-67</artifactId>
+    <packaging>pom</packaging>
+    <modules>
+        <module>lab-67-netty-demo</module>
+    </modules>
+
+
+</project>

pom.xml

@@ -110,6 +110,7 @@
 <!--        <module>labx-28</module>-->
 <!--        <module>labx-29</module>-->
 <!--        <module>labx-30</module>-->
+        <module>lab-67</module>
     </modules>
 
 </project>