我刚开始使用 netty，我对 netty 上的文档感到非常失望 他们的网站。

我正在尝试使用 Netty 连接到一个 URL。我从他们的网站上获取了时间客户端示例，并根据我的要求进行了更改。

代码:

public class NettyClient {

      public static void main(String[] args) throws Exception {
          String host = "myUrl.com/v1/parma?param1=value";
            int port = 443;
            EventLoopGroup workerGroup = new NioEventLoopGroup();

            try {
                Bootstrap b = new Bootstrap();             
                b.group(workerGroup); 
                b.channel(NioSocketChannel.class); 
                b.option(ChannelOption.SO_KEEPALIVE, true); 
                b.handler(new ChannelInitializer<SocketChannel>() {
                    @Override
                    public void initChannel(SocketChannel ch) throws Exception {
                        ch.pipeline().addLast(new ClientHandler());
                        ch.pipeline().addLast("encoder", new HttpRequestEncoder());
                    }
                });

                // Start the client.
                ChannelFuture f = b.connect(host, port).sync(); 

                // Wait until the connection is closed.
                f.channel().closeFuture().sync();
            } finally {
                workerGroup.shutdownGracefully();
            }
        }
}

但问题是它只需要没有查询参数的 url。我如何通过 URL 传递查询参数？ 并请提供一些关于 Netty 4 的良好文档的链接..

编辑

引用答案中提到的示例后的客户端代码:

URI uri = new URI("myUrl.com/v1/parma?param1=value");          
           String scheme = uri.getScheme() == null? "http" : uri.getScheme();
           String host = "myUrl.com";
            int port = 443;



            boolean ssl = "https".equalsIgnoreCase(scheme);

         // Configure the client.
            EventLoopGroup group = new NioEventLoopGroup();
            try {
                Bootstrap b = new Bootstrap();
                b.group(group)
                 .channel(NioSocketChannel.class)
                 .handler(new NettyClientInitializer(ssl));
                // Make the connection attempt.
                Channel ch = b.connect(host, port).sync().channel();
                // Prepare the HTTP request.
                HttpRequest request = new DefaultHttpRequest(
                        HttpVersion.HTTP_1_1, HttpMethod.GET, uri.getRawPath());
                request.headers().set(HttpHeaders.Names.HOST, host);
                request.headers().set(HttpHeaders.Names.CONNECTION, HttpHeaders.Values.CLOSE);
                //request.headers().set(HttpHeaders.Names.ACCEPT_ENCODING, HttpHeaders.Values.GZIP);

                /*// Set some example cookies.
                request.headers().set(
                        HttpHeaders.Names.COOKIE,
                        ClientCookieEncoder.encode(
                                new DefaultCookie("my-cookie", "foo"),
                                new DefaultCookie("another-cookie", "bar")));
*/
                // Send the HTTP request.
                ch.writeAndFlush(request);

                // Wait for the server to close the connection.
                ch.closeFuture().sync();
            } finally {
                // Shut down executor threads to exit.
                group.shutdownGracefully();
            }

处理程序代码:

public class ClientHandler extends SimpleChannelInboundHandler<HttpObject> {

    @Override
    public void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {
        if (msg instanceof HttpResponse) {
            HttpResponse response = (HttpResponse) msg;

            System.out.println("STATUS: " + response.getStatus());
            System.out.println("VERSION: " + response.getProtocolVersion());
            System.out.println();

            if (!response.headers().isEmpty()) {
                for (String name: response.headers().names()) {
                    for (String value: response.headers().getAll(name)) {
                        System.out.println("HEADER: " + name + " = " + value);
                    }
                }
                System.out.println();
            }

            if (HttpHeaders.isTransferEncodingChunked(response)) {
                System.out.println("CHUNKED CONTENT {");
            } else {
                System.out.println("CONTENT {");
            }
        }
        if (msg instanceof HttpContent) {
            HttpContent content = (HttpContent) msg;

            System.out.print(content.content().toString(CharsetUtil.UTF_8));
            System.out.flush();

            if (content instanceof LastHttpContent) {
                System.out.println("} END OF CONTENT");
            }
        }
    }

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


}

初始化代码:

public class NettyClientInitializer extends ChannelInitializer<SocketChannel> {

    private final boolean ssl;

    public NettyClientInitializer(boolean ssl) {
        this.ssl = ssl;
    }

    @Override
    public void initChannel(SocketChannel ch) throws Exception {
        // Create a default pipeline implementation.
        ChannelPipeline p = ch.pipeline();

        p.addLast("log", new LoggingHandler(LogLevel.INFO));
        // Enable HTTPS if necessary.
        /*
        if (ssl) {
            SSLEngine engine =
                SecureChatSslContextFactory.getClientContext().createSSLEngine();
            engine.setUseClientMode(true);

            p.addLast("ssl", new SslHandler(engine));
        }
*/
        p.addLast("codec", new HttpClientCodec());

        // Remove the following line if you don't want automatic content decompression.
       // p.addLast("inflater", new HttpContentDecompressor());

        // Uncomment the following line if you don't want to handle HttpChunks.
        p.addLast("aggregator", new HttpObjectAggregator(1048576));
        p.addLast("handler", new ClientHandler());
    }
}

最佳答案

您的代码目前仅处理低级连接。实际上，在此级别上只能使用主机名和端口。

对于 HTTP 请求，您必须构造一个 HttpRequest 对象并通过 channel 发送它。在这个请求对象中，您可以定义查询参数和所有此类内容。

Netty 网站上有一堆关于 HTTP 客户端功能的示例代码 - have a a look !

关于java - 使用 Netty 的 HTTP 请求，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/20041238/