Question

我正在实现一个接受HTTP请求并执行一些业务逻辑的Netty服务器基本上，我接受localhost / hello和sysout uri is hello

上的GET请求

运行服务器时，在CustomRequestHandler＃channelRead0方法中看不到任何sysout。我一直打开调试器，但没有看到channelRead0方法被调用。我不知道是什么问题

我正在使用Netty 4.1.30。最终版

public class HttpServer {

    public static void main( String[] args ) throws Exception {

        InetSocketAddress tcpSocketAddress = new InetSocketAddress(8080);

        System.out.println("Starting http server at " + tcpSocketAddress.getPort());
        EventLoopGroup bossGroup = new NioEventLoopGroup(1);
        EventLoopGroup workerGroup = new NioEventLoopGroup();

        try {

        ServerBootstrap bootstrap = new ServerBootstrap()
                .group(bossGroup, workerGroup)
                .channel(NioServerSocketChannel.class)
                .handler(new LoggingHandler(LogLevel.INFO))
                .childHandler(new MyChannelInitializer())
                .childOption(ChannelOption.AUTO_READ, false);


        ChannelFuture serverChannelFuture = bootstrap.bind(tcpSocketAddress).sync();
        System.out.println("open the browser");
        serverChannelFuture.channel().closeFuture().sync();
        } finally {
             bossGroup.shutdownGracefully();
             workerGroup.shutdownGracefully();
        }
    }
}


public class MyChannelIntializer extends ChannelInitializer<SocketChannel> {

    @Override
    public void initChannel(SocketChannel ch) {
        ChannelPipeline p = ch.pipeline();
        p.addLast(new LoggingHandler(LogLevel.INFO));
        //p.addLast(new HttpServerCodec());
        p.addLast(new HttpRequestDecoder());
        p.addLast(new HttpResponseEncoder());
        p.addLast(new CustomRequestHandler());
    }
}

public class CustomRequestHandler extends SimpleChannelInboundHandler<Object> {

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) {
        ctx.flush();
    }

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, Object httpObject) {
        System.out.println("hello world");
        if (httpObject instanceof HttpRequest) {
            HttpRequest request = (HttpRequest) httpObject;
            System.out.println("uri is " + request.getUri());
    }
}

Answer 1

问题是您使用了：

                .childOption(ChannelOption.AUTO_READ, false);

这意味着，一旦频道被接受，它会在您每次要处理更多入站数据时调用ctx.read()之前不会处理任何传入数据。

因此，您可以选择删除此行，也可以覆盖channelActive(...)中的CustomRequestHandler并在那里调用ctx.read()。这将确保您尝试读取一些入站数据。也就是说，要处理更多数据时，您将需要再次调用ctx.read()。

向Netty服务器发出请求时，不会调用ChannelRead方法

1 个答案: