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Netty构建HttP

Netty构建HttP

作者: anyly | 来源:发表于2020-01-03 11:41 被阅读0次
    1. 众所周知,Http协议的上层是TCP,Netty作为非阻塞框架的大佬,完全有能力承担高并发,高可用的角色.先上车,后解释,
    2. 可以用Netty创建一个TCP服务\color{red}{(测试Http的底层为TCP)},用浏览器请求,看能否收到请求,只要响应的是Http响应头,浏览器就可以解析

    1.HttpServer.java

    public class HttpServer {
        public void start(int port) throws Exception {
            EventLoopGroup bossGroup = new NioEventLoopGroup();
            EventLoopGroup workerGroup = new NioEventLoopGroup();
            try {
                ServerBootstrap b = new ServerBootstrap();
                b.group(bossGroup, workerGroup)
                        .handler(new LoggingHandler(LogLevel.DEBUG))
                        .channel(NioServerSocketChannel.class)
                        .childHandler(new ChannelInitializer<SocketChannel>() {
                            @Override
                            public void initChannel(SocketChannel ch)
                                    throws Exception {
                                // server端发送的是httpResponse,所以要使用HttpResponseEncoder进行编码
                                ch.pipeline().addLast(
                                        new HttpResponseEncoder());
                                // server端接收到的是httpRequest,所以要使用HttpRequestDecoder进行解码
                                ch.pipeline().addLast(
                                        new HttpRequestDecoder());
                                ch.pipeline().addLast(
                                        new HttpObjectAggregator(512 * 1024));
                                ch.pipeline().addLast(
                                        new HttpServerHandler());
                                //增加自定义实现的Handler
                                ch.pipeline().addLast(new HttpServerCodec());
                            }
                        }).option(ChannelOption.SO_BACKLOG, 128)
                        .childOption(ChannelOption.SO_KEEPALIVE, true);
                ChannelFuture f = b.bind(port).sync();
                f.channel().closeFuture().sync();
            } finally {
                workerGroup.shutdownGracefully();
                bossGroup.shutdownGracefully();
            }
        }
    
        public static void main(String[] args) throws Exception {
            HttpServer server = new HttpServer();
            server.start(8080);
        }
    
    public class HttpServerHandler extends ChannelInboundHandlerAdapter {
        @Override
        public void channelRead(ChannelHandlerContext ctx, Object msg) {
            if (msg instanceof HttpRequest) {
                HttpRequest httpRequest = (HttpRequest) msg;
                System.out.println(Thread.currentThread().getId() + "->");
                System.out.println(httpRequest.uri() + ":" + ctx.channel().remoteAddress().toString());
                String uri = httpRequest.uri();
                if (msg instanceof HttpContent) {
                    if(HttpPostRequestDecoder.isMultipart(httpRequest)){
                        // 是POST请求
                        HttpPostRequestDecoder decoder = new HttpPostRequestDecoder(httpRequest);
                        decoder.offer((HttpContent)httpRequest);
                        List<InterfaceHttpData> parmList = decoder.getBodyHttpDatas();
                        System.out.println("form conent : \r\n" + parmList);
                    }else{
                        HttpContent content = (HttpContent) msg;
                        ByteBuf buf = content.content();;
                        String requestString = buf.toString(io.netty.util.CharsetUtil.UTF_8);
                        buf.release();
                        System.out.println("json conent : \r\n" + requestString);
                    }
    
    
                }
                Map<String, String> resMap = new HashMap<>();
                resMap.put("method", httpRequest.method().name());
                Set<Cookie> cookies = ServerCookieDecoder.LAX.decode(httpRequest.headers().get(HttpHeaderNames.COOKIE));
                resMap.put("uri", uri);
                // String text = "<html><head><title>test</title></head><body>你请求 port:"+ctx.channel().remoteAddress().toString()+" uri为:" + uri + ":" + httpRequest.headers().get(HttpHeaderNames.COOKIE) + "</body></html>";
                String text = "<html><head><title>test</title></head><body>你请求 port:" + ctx.channel().remoteAddress().toString() + " uri为:" + uri + "</body></html>";
                // 创建http响应
                FullHttpResponse response = new DefaultFullHttpResponse(
                        HttpVersion.HTTP_1_1,
                        HttpResponseStatus.OK,
                        Unpooled.copiedBuffer(text, CharsetUtil.UTF_8));
                // 设置头信息
                response.headers().set(HttpHeaderNames.SET_COOKIE, ServerCookieEncoder.STRICT.encode("JSESESSION", "1234"));
                response.headers().set(HttpHeaderNames.CONTENT_TYPE, "text/html; charset=UTF-8");
                // 将html write到客户端
                ctx.writeAndFlush(response).addListener(ChannelFutureListener.CLOSE);
    
            }
    
        }
    
    
        @Override
        public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
            ctx.flush();
        }
    
        @Override
        public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)
                throws Exception {
            String text = "<html><head><title>test</title></head><body>你请求uri为:" + cause.toString() + "</body></html>";
    
            FullHttpResponse response = new DefaultFullHttpResponse(
                    HttpVersion.HTTP_1_1,
                    HttpResponseStatus.OK,
                    Unpooled.copiedBuffer(text, CharsetUtil.UTF_8));
            // 设置头信息
            response.headers().set(HttpHeaderNames.SET_COOKIE, ServerCookieEncoder.STRICT.encode("JSESESSION", "1234"));
            response.headers().set(HttpHeaderNames.CONTENT_TYPE, "text/html; charset=UTF-8");
            // 将html write到客户端
            ctx.writeAndFlush(response).addListener(ChannelFutureListener.CLOSE);
            ctx.close();
        }
    

    线程组:

     EventLoopGroup bossGroup = new NioEventLoopGroup();//主线程
     EventLoopGroup workerGroup = new NioEventLoopGroup();// 工作线程
    
    主线程用来接受tcp请求并分发,工作线程用来处理请求
    
    解码器(解析tcp请求过来的数据)
    HttpRequestDecoder() 
    
    HttpPostRequestDecoder.isMultipart(httpRequest)
    用来区分是表单还是Json
    

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