Restart --- sgg-netty ---- tcp paquete de pegajoso y desembalaje --10

flujo TCP protección de mensajes orientados hay límite.

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Error de caso:

    

El primer paso:

public class MyClient {
    public static void main(String[] args)  throws  Exception{
        EventLoopGroup group = new NioEventLoopGroup();
        try {
            Bootstrap bootstrap = new Bootstrap();
            bootstrap.group(group).channel(NioSocketChannel.class)
                    .handler(new MyClientInitializer()); //自定义一个初始化类
            ChannelFuture channelFuture = bootstrap.connect("localhost", 7000).sync();
            channelFuture.channel().closeFuture().sync();
        }finally {
            group.shutdownGracefully();
        }
    }
}

Paso dos:

public class MyClientInitializer extends ChannelInitializer<SocketChannel> {
    @Override
    protected void initChannel(SocketChannel ch) throws Exception {
        ChannelPipeline pipeline = ch.pipeline();
        pipeline.addLast(new MyClientHandler());
    }
}

El tercer paso:

public class MyClientHandler extends SimpleChannelInboundHandler<ByteBuf> {
    private int count;
    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        //使用客户端发送10条数据 hello,server 编号
        for(int i= 0; i< 10; ++i) {
            ByteBuf buffer = Unpooled.copiedBuffer("hello,server " + i, Charset.forName("utf-8"));
            ctx.writeAndFlush(buffer);
        }
    }
    @Override
    protected void channelRead0(ChannelHandlerContext ctx, ByteBuf msg) throws Exception {
        byte[] buffer = new byte[msg.readableBytes()];
        msg.readBytes(buffer);
        String message = new String(buffer, Charset.forName("utf-8"));
        System.out.println("客户端接收到消息=" + message);
        System.out.println("客户端接收消息数量=" + (++this.count));
    }
    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        cause.printStackTrace();
        ctx.close();
    }
}

Me tengo que enviar 10 datos. La transmisión de los puntos 10 veces.

Cuarto paso: Escribir servidor

public class MyServer {
    public static void main(String[] args) throws Exception{
        EventLoopGroup bossGroup = new NioEventLoopGroup(1);
        EventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap serverBootstrap = new ServerBootstrap();
            serverBootstrap.group(bossGroup,workerGroup).channel(NioServerSocketChannel.class).childHandler(new MyServerInitializer()); //自定义一个初始化类
            ChannelFuture channelFuture = serverBootstrap.bind(7000).sync();
            channelFuture.channel().closeFuture().sync();
        }finally {
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }
}

Paso cinco:

public class MyServerInitializer extends ChannelInitializer<SocketChannel> {
    @Override
    protected void initChannel(SocketChannel ch) throws Exception {
        ChannelPipeline pipeline = ch.pipeline();
        pipeline.addLast(new MyServerHandler());
    }
}

Sexto paso:

public class MyServerHandler extends SimpleChannelInboundHandler<ByteBuf>{
    private int count;
    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        //cause.printStackTrace();
        ctx.close();
    }
    @Override
    protected void channelRead0(ChannelHandlerContext ctx, ByteBuf msg) throws Exception {
        byte[] buffer = new byte[msg.readableBytes()];
        msg.readBytes(buffer);
        //将buffer转成字符串
        String message = new String(buffer, Charset.forName("utf-8"));
        System.out.println("服务器接收到数据 " + message);
        System.out.println("服务器接收到消息量=" + (++this.count));
        //服务器回送数据给客户端, 回送一个随机id ,
        ByteBuf responseByteBuf = Unpooled.copiedBuffer(UUID.randomUUID().toString() + " ", Charset.forName("utf-8"));
        ctx.writeAndFlush(responseByteBuf);
    }
}

Resultados del ensayo:

Siete ocurrió paquete de palo.

Servidor una vez que el número de bytes leídos es incierto.

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paquete de palo y soluciones de desembalaje.

código:

El primer paso: paquete de protocolo de escritura

//协议包
public class MessageProtocol {
    private int len; //关键
    private byte[] content;
    public int getLen() {
        return len;
    }
    public void setLen(int len) {
        this.len = len;
    }
    public byte[] getContent() {
        return content;
    }
    public void setContent(byte[] content) {
        this.content = content;
    }
}

Segundo paso: Modificar el controlador de cliente

public class MyClientHandler extends SimpleChannelInboundHandler<MessageProtocol> {
    private int count;
    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        //使用客户端发送10条数据 "今天天气冷，吃火锅" 编号
        for(int i = 0; i< 5; i++) {
            String mes = "今天天气冷，吃火锅";
            byte[] content = mes.getBytes(Charset.forName("utf-8"));// 做成字节数组
            int length = mes.getBytes(Charset.forName("utf-8")).length;
            //创建协议包对象
            MessageProtocol messageProtocol = new MessageProtocol();
            messageProtocol.setLen(length);
            messageProtocol.setContent(content);
            ctx.writeAndFlush(messageProtocol);
        }
    }
//    @Override
    protected void channelRead0(ChannelHandlerContext ctx, MessageProtocol msg) throws Exception {
        int len = msg.getLen();
        byte[] content = msg.getContent();
        System.out.println("客户端接收到消息如下");
        System.out.println("长度=" + len);
        System.out.println("内容=" + new String(content, Charset.forName("utf-8")));
        System.out.println("客户端接收消息数量=" + (++this.count));
    }
    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        System.out.println("异常消息=" + cause.getMessage());
        ctx.close();
    }
}

El tercer paso: tenemos que llevar a cabo el proceso de codificación, ya que el objeto se transmite Bueno

public class MyMessageEncoder extends MessageToByteEncoder<MessageProtocol> {
    @Override
    protected void encode(ChannelHandlerContext ctx, MessageProtocol msg, ByteBuf out) throws Exception {
        System.out.println("MyMessageEncoder encode 方法被调用");
        out.writeInt(msg.getLen());
        out.writeBytes(msg.getContent());
    }
}

Paso cuatro: Añadir Encoder

public class MyClientInitializer extends ChannelInitializer<SocketChannel> {
    @Override
    protected void initChannel(SocketChannel ch) throws Exception {
        ChannelPipeline pipeline = ch.pipeline();
        pipeline.addLast(new MyMessageEncoder()); //加入编码器
        pipeline.addLast(new MyMessageDecoder()); //加入解码器
        pipeline.addLast(new MyClientHandler());
    }
}

Paso cinco: Agregar decodificadores

public class MyMessageDecoder extends ReplayingDecoder<Void> {
    @Override
    protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
        System.out.println("MyMessageDecoder decode 被调用");
        //需要将得到二进制字节码-> MessageProtocol 数据包(对象)
        int length = in.readInt(); // 第一个是长度的
        byte[] content = new byte[length];
        in.readBytes(content);
        //封装成 MessageProtocol 对象，放入 out， 传递下一个handler业务处理
        MessageProtocol messageProtocol = new MessageProtocol();
        messageProtocol.setLen(length);
        messageProtocol.setContent(content);
        out.add(messageProtocol);
    }
}

Sexto paso: Escribir servidor lee

@Override
    protected void channelRead0(ChannelHandlerContext ctx, MessageProtocol msg) throws Exception {
        //接收到数据，并处理
        int len = msg.getLen();
        byte[] content = msg.getContent();
        System.out.println();
        System.out.println();
        System.out.println();
        System.out.println("服务器接收到信息如下");
        System.out.println("长度=" + len);
        System.out.println("内容=" + new String(content, Charset.forName("utf-8")));
        System.out.println("服务器接收到消息包数量=" + (++this.count));
        //回复消息
        String responseContent = UUID.randomUUID().toString();
        int responseLen = responseContent.getBytes("utf-8").length;
        byte[]  responseContent2 = responseContent.getBytes("utf-8");
        //构建一个协议包
        MessageProtocol messageProtocol = new MessageProtocol();
        messageProtocol.setLen(responseLen);
        messageProtocol.setContent(responseContent2);
        ctx.writeAndFlush(messageProtocol);
    }

Solución de ensayo se adhieren paquete de desembalaje.

Cada cliente tiene sus propias 12.345 cinco veces, lo que indica que un cliente es un hilo.

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Responder:

1. Escribir el código de respuesta del servidor

2. Escribir el mensaje del cliente acepta

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Ordenar contenido: protocolo personalizado Encoder Decoder +

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