netty发送对象消息

左手的ㄟ右手 2023-10-09 13:03 16阅读 0赞

### 前言 ###

通过之前的学习，我们知道使用netty在客户端和服务端之间很容易发送一个文本类的消息，但在实际应用中这肯定是不够用的，像java中使用最多的对象这种形式的数据，在客户端和服务端通信的时候也必然会涉及，那么netty作为通信的框架，也会有相应的支持

其实在所有的通信过程中，不管是普通的文本消息还是对象消息甚至是其他格式的数据，在传输过程中，对方解析的时候就会涉及到序列化和反序列化的问题，同样，使用netty在进行客户端与服务端消息传输时，如果发送对象类的消息，就需要借助序列化和反序列化对应的组件，下面介绍两种常用的方式，使用protostuff和marshalling分别发送对象消息

### 方式一，使用protostuff ###

序列化方式有很多中，JDK自带的方式，JSON方式,google的Protobuf，google原生的protobuffer使用起来相当麻烦，首先要写.proto文件，然后编译.proto文件，生成对应的.java文件，试了一次，发现真的很麻烦；总结来说，Protobuf是一种序列化工具，相对于其他的序列化组件，Protobuf功能更加丰富和强大，下面开始整合过程，

**1、导入pom依赖**

<dependency>
                <groupId>io.netty</groupId>
                <artifactId>netty-all</artifactId>
                <version>5.0.0.Alpha2</version>
                
            </dependency>
    
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-api</artifactId>
                <version>1.7.25</version>
            </dependency>
            <dependency>
                <groupId>ch.qos.logback</groupId>
                <artifactId>logback-classic</artifactId>
                <version>1.1.7</version>
            </dependency>
            <dependency>
                <groupId>ch.qos.logback</groupId>
                <artifactId>logback-core</artifactId>
                <version>1.1.7</version>
            </dependency>
            <dependency>
                <groupId>ch.qos.logback</groupId>
                <artifactId>logback-access</artifactId>
                <version>1.1.7</version>
            </dependency>
            <dependency>
                <groupId>io.protostuff</groupId>
                <artifactId>protostuff-api</artifactId>
            </dependency>
            <dependency>
                <groupId>io.protostuff</groupId>
                <artifactId>protostuff-core</artifactId>
            </dependency>
            <dependency>
                <groupId>io.protostuff</groupId>
                <artifactId>protostuff-runtime</artifactId>
            </dependency>

**2、构造一个简单的对象**  
由于是模拟，这里只弄了两个简单的属性，使用了toString方法，方便后面看效果

public class Person implements Serializable {
    
        private static final long  SerialVersionUID = 1L;
        private int id;
        private String name;
    
        public int getId() {
            return id;
        }
    
        public String getName() {
            return name;
        }
    
        public void setId(int id) {
            this.id = id;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public Person(int id, String name) {
            this.id = id;
            this.name = name;
        }
    
        public Person() {
    
        }
    
        @Override
        public String toString() {
            return "Person{" +
                    "id=" + id +
                    ", name='" + name + '\'' +
                    '}';
        }
    }

**3、netty服务端server**  
通过之前的篇章的学习，想必大家都了解了netty编程的风格和特点了吧，这里就直接上代码了

import io.netty.bootstrap.ServerBootstrap;
    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.handler.logging.LogLevel;
    import io.netty.handler.logging.LoggingHandler;
    
    public class NettyServer {
    
        public static void main(String[] args) throws Exception{
            EventLoopGroup boss = new NioEventLoopGroup(1);
            EventLoopGroup worker = new NioEventLoopGroup();
            ServerBootstrap bootstrap = new ServerBootstrap();
            bootstrap.group(boss, worker)
                    .channel(NioServerSocketChannel.class)
                    .option(ChannelOption.SO_BACKLOG, 128)
                    .handler(new LoggingHandler(LogLevel.TRACE))
                    //自定义ServerInitialize，方便后续代码维护
                    .childHandler(new ServerInitialize());  
    
            ChannelFuture future = bootstrap.bind(8899).sync();
            System.out.println("server start in port:8899");
            future.channel().closeFuture().sync();
            boss.shutdownGracefully();
            worker.shutdownGracefully();
        }
    
    }

**4、server端自定义ServerInitialize**  
网上有很多资料喜欢把ServerInitialize这个类直接写到server类中，虽然效果是一样的，但从代码的优雅性和可维护角度看并不是很好，而且官方也不建议这么做，最好做成一个类去继承ChannelInitializer，在这个类里面添加各种自定义处理逻辑，复合netty的编程特点

public class ServerInitialize extends ChannelInitializer<SocketChannel> {
    
        @Override
        protected void initChannel(SocketChannel socketChannel) {
            ChannelPipeline pipeline = socketChannel.pipeline();
            pipeline.addLast(new LengthFieldBasedFrameDecoder(10240, 0, 4, 0, 4));
            pipeline.addLast(new ProtostuffDecoder());
            pipeline.addLast(new ProtoStuffServerHandler());
        }
    
    }

这个LengthFieldBasedFrameDecoder中的相关参数，可以根据实际传输对象的大小进行自定义设置，ProtostuffDecoder为服务端对象编码的工具类，代码如下，

//用将ByteBuf中的数据转换成Person对象
    public class ProtostuffDecoder extends ByteToMessageDecoder {
    
        @Override
        protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
            Schema<Person> schema = RuntimeSchema.getSchema(Person.class);
            Person person = schema.newMessage();
            byte[] array = new byte[in.readableBytes()];
            in.readBytes(array);
            ProtobufIOUtil.mergeFrom(array, person, schema);
            out.add(person);
        }
    
    }

简答解释一下这个逻辑，其实这里做对象的解析是由两步构成的，如下圈起来的部分：  
1、服务器端先用LengthFieldBasedFrameDecoder进行解码，获取到一个完整的ByteBuf消息；  
2、然后ProtostuffDecoder解码器将上一步解码出来的消息，转换成一个Person对象，也就是ProtostuffDecoder 工具类要做的事情  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5nY29uZ3lpNDIw_size_16_color_FFFFFF_t_70]  
由于netty的handler的处理逻辑是链式的，在真正实现自己的handler逻辑之前，前两步已经把对象进行反序列化了，那么在自己的handler逻辑中就可以直接使用了，这也是为什么将自定义的handler放在最后的原因

**4、server端自定义handler**

import io.netty.channel.ChannelHandlerContext;
    import io.netty.channel.SimpleChannelInboundHandler;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    public class ProtoStuffServerHandler extends SimpleChannelInboundHandler {
    
        private static Logger logger = LoggerFactory.getLogger(ProtoStuffServerHandler.class);
    
        private int counter = 0;
    
        @Override
        protected void messageReceived(ChannelHandlerContext channelHandlerContext, Object msg) throws Exception {
            Person person = (Person) msg;
            logger.info("当前是第[{}]次获取到客户端发送过来的person对象[{}].", ++counter, person.toString());
    
        }
    
        /** 当发生了异常时，次方法调用 */
        @Override
        public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
            logger.error("error:", cause);
            ctx.close();
        }
    
    }

这里面的逻辑比较简单，只是单纯的接收数据，打印数据，在真实业务中，接收到数据后，可以进行其他的业务逻辑处理，这里不继续延伸了，以上就是服务端的全部代码，下面看客户端代码部分

**5、客户端server**

import io.netty.bootstrap.Bootstrap;
    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.NioSocketChannel;
    
    public class NettyClient {
    
        public static void main(String[] args) throws Exception {
    
            EventLoopGroup group = new NioEventLoopGroup(1);
    
            Bootstrap bootstrap = new Bootstrap();
            bootstrap.group(group)
                    .channel(NioSocketChannel.class)
                    .option(ChannelOption.TCP_NODELAY, true)
                    .handler(new ClientInitialize());
    
            ChannelFuture future = bootstrap.connect("localhost", 8899).sync();
            System.out.println("client connect server.");
            future.channel().closeFuture().sync();
            group.shutdownGracefully();
    
        }
    
    }

**5、客户端自定义ClientInitialize**

public class ClientInitialize extends ChannelInitializer<SocketChannel> {
    
        @Override
        protected void initChannel(SocketChannel socketChannel) {
    
            ChannelPipeline pipeline = socketChannel.pipeline();
            pipeline.addLast(new LengthFieldPrepender(4));
            pipeline.addLast(new ProtostuffEncoder());
            pipeline.addLast(new ProtostuffClientHandler());
        }
    
    }

在这个类里面，客户端是发送对象数据的一方，因此需要一个方法，将对象进行编码，即ProtostuffEncoder，

//用于将Person对象编码成字节数组
    public class ProtostuffEncoder extends MessageToByteEncoder<Person> {
    
        @Override
        protected void encode(ChannelHandlerContext ctx, Person msg, ByteBuf out) throws Exception {
            LinkedBuffer buffer = LinkedBuffer.allocate(1024);
            Schema<Person> schema = RuntimeSchema.getSchema(Person.class);
            byte[] array = ProtobufIOUtil.toByteArray(msg, schema, buffer);
            out.writeBytes(array);
        }
    
    }

**6、客户端自定义handler**

import io.netty.channel.ChannelHandlerContext;
    import io.netty.channel.SimpleChannelInboundHandler;
    
    public class ProtostuffClientHandler extends SimpleChannelInboundHandler {
    
        @Override
        public void channelActive(ChannelHandlerContext ctx) throws Exception {
            Person person;
            for (int i = 0; i < 10; i++) {
                person = new Person();
                person.setId(i);
                person.setName("张三丰" + i);
                ctx.writeAndFlush(person);
            }
        }
    
        @Override
        protected void messageReceived(ChannelHandlerContext channelHandlerContext, Object o) {
    
        }
    
        @Override
        public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
            System.out.println("客户端发生异常:" + cause);
            ctx.close();
        }
    }

为了演示效果，在channelActive这个回调方法中，即客户端连接服务端建立通信的channel的时候就直接发送10条数据，当然也可以在messageReceived这个里面编写，以上是客户端的所有代码，下面我们启动程序看一下效果，

启动服务端，  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5nY29uZ3lpNDIw_size_16_color_FFFFFF_t_70 1]

启动客户端，  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5nY29uZ3lpNDIw_size_16_color_FFFFFF_t_70 2]

启动完毕客户端，再看服务端的控制台，可以看到，服务端成功收到了客户端发送过来的对象消息  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5nY29uZ3lpNDIw_size_16_color_FFFFFF_t_70 3]

### 方式二，使用Marshalling发送对象消息 ###

过程和上传差不多，  
**1、导入依赖**

<dependency>
              <groupId>org.jboss.marshalling</groupId>
              <artifactId>jboss-marshalling-serial</artifactId>
              <version>2.0.0.Beta2</version>
        </dependency>

**2、Marshalling编解码工具类**

import io.netty.handler.codec.marshalling.MarshallingDecoder;
    import io.netty.handler.codec.marshalling.UnmarshallerProvider;
    import io.netty.handler.codec.marshalling.*;
    import org.jboss.marshalling.MarshallerFactory;
    import org.jboss.marshalling.Marshalling;
    import org.jboss.marshalling.MarshallingConfiguration;
    
    /**
     * 对象编解码工具类
     */
    public class MarshallingCodeCFactory {
    
        /**
         * 创建Jboss Marshalling解码器MarshallingDecoder
         * @return MarshallingDecoder
         */
        public static MarshallingDecoder buildMarshallingDecoder() {
            //首先通过Marshalling工具类的精通方法获取Marshalling实例对象 参数serial标识创建的是java序列化工厂对象。
            final MarshallerFactory marshallerFactory = Marshalling.getProvidedMarshallerFactory("serial");
            //创建了MarshallingConfiguration对象，配置了版本号为5
            final MarshallingConfiguration configuration = new MarshallingConfiguration();
            configuration.setVersion(5);
            //根据marshallerFactory和configuration创建provider
            UnmarshallerProvider provider = new DefaultUnmarshallerProvider(marshallerFactory, configuration);
            //构建Netty的MarshallingDecoder对象，俩个参数分别为provider和单个消息序列化后的最大长度
            MarshallingDecoder decoder = new MarshallingDecoder(provider, 1024 * 1024 * 1);
            return decoder;
        }
    
        /**
         * 创建Jboss Marshalling编码器MarshallingEncoder
         * @return MarshallingEncoder
         */
        public static MarshallingEncoder buildMarshallingEncoder() {
            final MarshallerFactory marshallerFactory = Marshalling.getProvidedMarshallerFactory("serial");
            final MarshallingConfiguration configuration = new MarshallingConfiguration();
            configuration.setVersion(5);
            MarshallerProvider provider = new DefaultMarshallerProvider(marshallerFactory, configuration);
            //构建Netty的MarshallingEncoder对象，MarshallingEncoder用于实现序列化接口的POJO对象序列化为二进制数组
            MarshallingEncoder encoder = new MarshallingEncoder(provider);
            return encoder;
        }
    
    
    }

这个工具类将会被客户端或服务端在任何地方使用，即在传输对象的方法里均可以使用

**3、服务端server**

import io.netty.bootstrap.ServerBootstrap;
    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;
    
    public class NettyServer {
    
        public static void main(String[] args) throws Exception{
            EventLoopGroup boss = new NioEventLoopGroup();
            EventLoopGroup worker = new NioEventLoopGroup();
            ServerBootstrap bootstrap = new ServerBootstrap();
            bootstrap.group(boss, worker)
                    .channel(NioServerSocketChannel.class)
                    .option(ChannelOption.SO_BACKLOG, 1024)
                    .childHandler(new ServerInitialize());
    
            ChannelFuture future = bootstrap.bind(8888).sync();
            System.out.println("server start in port:8888");
            future.channel().closeFuture().sync();
            boss.shutdownGracefully();
            worker.shutdownGracefully();
        }
    
    }

**4、服务端自定义ServerInitialize**

import io.netty.channel.ChannelInitializer;
    import io.netty.channel.ChannelPipeline;
    import io.netty.channel.socket.SocketChannel;
    
    public class ServerInitialize extends ChannelInitializer<SocketChannel> {
    
        @Override
        protected void initChannel(SocketChannel socketChannel) {
            ChannelPipeline pipeline = socketChannel.pipeline();
            pipeline.addLast(MarshallingCodeCFactory.buildMarshallingDecoder());
            pipeline.addLast(MarshallingCodeCFactory.buildMarshallingEncoder());
            pipeline.addLast(new ServerHandler());
        }
    
    }

这里面可能有些小伙伴不太理解，服务端为什么要把编解码的两个方法都要加上了，因为在实际使用中，服务端也有可能要发对象消息给客户端使用

**5、服务端自定义handler**

import io.netty.channel.ChannelHandlerContext;
    import io.netty.channel.SimpleChannelInboundHandler;
    
    public class ServerHandler extends SimpleChannelInboundHandler {
    
        /**
         * 接收到消息的时候触发
         * @param channelHandlerContext
         * @param msg
         */
        @Override
        protected void messageReceived(ChannelHandlerContext channelHandlerContext, Object msg) {
            Person person = (Person) msg;
            System.out.println("收到了客户端发过来的对象消息:" + person.toString());
            channelHandlerContext.channel().writeAndFlush("已经确认收到消息了");
        }
    
        /**
         * 抛出异常的时候触发
         * @param ctx
         * @param cause
         * @throws Exception
         */
        @Override
        public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
            super.exceptionCaught(ctx, cause);
            ctx.close();
        }
    }

**6、客户端server**

import io.netty.bootstrap.Bootstrap;
    import io.netty.channel.ChannelFuture;
    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.NioSocketChannel;
    
    public class NettyClient {
    
        public static void main(String[] args) throws Exception {
            EventLoopGroup workerGroup = new NioEventLoopGroup();//负责处理任务
            Bootstrap bootstrap = new Bootstrap();
            bootstrap.group(workerGroup)
                    .channel(NioSocketChannel.class)
                    .handler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel socketChannel) {
                            socketChannel.pipeline().addLast(MarshallingCodeCFactory.buildMarshallingDecoder());//添加处理器
                            socketChannel.pipeline().addLast(MarshallingCodeCFactory.buildMarshallingEncoder());//添加处理器
                            socketChannel.pipeline().addLast(new ClientHandler());
                        }
                    })
                    .option(ChannelOption.SO_BACKLOG, 1024)
                    .option(ChannelOption.SO_KEEPALIVE, true);
    
            Person request = new Person();
            request.setName("xxxx");
            request.setId(20);
            ChannelFuture f = bootstrap.connect("127.0.0.1",8888).sync();
            f.channel().writeAndFlush(request);
            f.channel().closeFuture().sync();
            workerGroup.shutdownGracefully();
        }
    
    }

**7、客户端handler**

public class ClientHandler extends SimpleChannelInboundHandler {
    
        @Override
        protected void messageReceived(ChannelHandlerContext channelHandlerContext, Object msg) {
            String message = (String)msg;
            System.out.println("来自服务端的消息:" + message);
        }
    
        @Override
        public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
            super.exceptionCaught(ctx, cause);
            ctx.close();
        }
    
        @Override
        public void channelActive(ChannelHandlerContext ctx) throws Exception {
            Person person = new Person();
            person.setId(111);
            person.setName("张三丰");
            ctx.writeAndFlush(person);
        }
    }

到这里，客户端和服务端的所有代码就全部编写完了，下面运行一下程序

启动服务端，  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5nY29uZ3lpNDIw_size_16_color_FFFFFF_t_70 4]

启动客户端，这个里面，由于服务端先启动的，客户端只要一启动就立即发送了消息，  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5nY29uZ3lpNDIw_size_16_color_FFFFFF_t_70 5]

再看服务端的控制台，也成功收到了两个对象的消息，同时回应给客户端的确认消息也在客户端的控制台上打印了出来  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5nY29uZ3lpNDIw_size_16_color_FFFFFF_t_70 6]

**综上，就是本篇关于使用netty发送对象消息的两种方式的全部内容，希望对看到的小伙伴们有用，最后，感谢观看！**

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5nY29uZ3lpNDIw_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20190928152607527.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5nY29uZ3lpNDIw,size_16,color_FFFFFF,t_70
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5nY29uZ3lpNDIw_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20190928154056787.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5nY29uZ3lpNDIw,size_16,color_FFFFFF,t_70
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