当发送到服务器的消息数量更多时，Netty 中的客户端未收到消息

Question

我使用 JAVA 中的 Netty 包实现了一个非常基本的 EchoClient 和 EchoServer。我对 Netty 非常陌生。下面是我的 client 、 clientHandler 、 server 和 serverHandler 的代码。

我的客户

public class EchoClient {
    private final String host;
    private final int port;

    public EchoClient(String host, int port) {
        this.host = host;
        this.port = port;
    }

    public static void main(String[] args) throws Exception {
        new EchoClient("127.0.0.1", 11235).start();
    }

    public void start() throws Exception {
        EventLoopGroup group = new NioEventLoopGroup();
        try {
            Bootstrap b = new Bootstrap();
            b.group(group).channel(NioSocketChannel.class)
                    .remoteAddress(new InetSocketAddress(host, port))
                    .handler(new ChannelInitializer<SocketChannel>() {

                        @Override
                        public void initChannel(SocketChannel ch) throws Exception {
                            ch.pipeline().addLast(new EchoClientHandler());
                        }
                    });
            ChannelFuture future = b.connect().sync();
            future.channel().closeFuture().sync();

        } finally {
            group.shutdownGracefully().sync();
        }

    }
}

我的客户处理程序

public class EchoClientHandler extends SimpleChannelInboundHandler<ByteBuf>{

    @Override
    public void channelActive(ChannelHandlerContext ctx) {
        System.out.println("Connected");
        int i = 0;
        while (i < 1000) {
            ctx.writeAndFlush(Unpooled.copiedBuffer("Netty MAY rock!\n", CharsetUtil.UTF_8));
            i++;
        }
    }

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, ByteBuf in) throws Exception {
        System.out.println(
                "Client received: " + in.toString(CharsetUtil.UTF_8));

    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause){
        cause.printStackTrace();
        ctx.close();
    }
}

我的服务器

public class EchoServer {

    private final int port;

    public EchoServer(int port) {
        this.port = port;
    }

    public static void main(String[] args) throws Exception {
        new EchoServer(11235).start();
    }

    public void start() throws Exception {
        EventLoopGroup group = new NioEventLoopGroup();
        try {
            ServerBootstrap b = new ServerBootstrap();
            b.group(group)
                    .channel(NioServerSocketChannel.class)
                    .localAddress(new InetSocketAddress(port))
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        public void initChannel(SocketChannel ch) throws Exception {
                            System.out.println("New client connected: " + ch.localAddress());
                            ch.pipeline().addLast(new EchoServerHandler());
                        }
                    });
            ChannelFuture f = b.bind().sync();
            f.channel().closeFuture().sync();
        } finally {
            group.shutdownGracefully().sync();
        }
    }
}

我的服务器处理程序

public class EchoServerHandler extends ChannelInboundHandlerAdapter {

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) {
        ByteBuf in = (ByteBuf) msg;
        System.out.println("Server received: " + n.toString(CharsetUtil.UTF_8));
        ctx.write(in);
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) {
        ctx.writeAndFlush(Unpooled.EMPTY_BUFFER)
                .addListener(ChannelFutureListener.CLOSE);
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        cause.printStackTrace();
        ctx.close();
    }
}

现在的问题是：当我在 ClientHandler 中将 while 循环编写为 i

Answer 1

您在第一次阅读后立即关闭您的服务器频道。请删除您的EchoServerHandler 类的channelReadComplete 中的.addListener(ChannelFutureListener.CLOSE)。