netty寫一個http伺服器

hyun001發表於2020-10-08
NettyHTTP伺服器

一、客戶端

客戶端啟動類

/**
 * @author yun
 * 類說明：
 */
public class HttpClient {
    public void connect(String host, int port) throws Exception {
        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 HttpClientCodec());
                    ch.pipeline().addLast("aggre",
                            new HttpObjectAggregator(10*1024*1024));
                    ch.pipeline().addLast("decompressor",new HttpContentDecompressor());
                    ch.pipeline().addLast("busi",new HttpClientInboundHandler());
                }
            });

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

            URI uri = new URI("/test");
            String msg = "Hello";
            DefaultFullHttpRequest request =
                    new DefaultFullHttpRequest(HttpVersion.HTTP_1_1,
                    HttpMethod.GET,
                    uri.toASCIIString(),
                    Unpooled.wrappedBuffer(msg.getBytes("UTF-8")));

            // 構建http請求
            request.headers().set(HttpHeaderNames.HOST, host);
            request.headers()
                    .set(HttpHeaderNames.CONNECTION,
                            HttpHeaderValues.KEEP_ALIVE);
            request.headers()
                    .set(HttpHeaderNames.CONTENT_LENGTH,
                            request.content().readableBytes());
            // 傳送http請求
            f.channel().write(request);
            f.channel().flush();
            f.channel().closeFuture().sync();
        } finally {
            workerGroup.shutdownGracefully();
        }

    }

    public static void main(String[] args) throws Exception {
        HttpClient client = new HttpClient();
        client.connect("127.0.0.1", HttpServer.port);
    }
}

客戶端處理類

/**
 * @authoryun
 * 類說明：
 */
public class HttpClientInboundHandler
        extends ChannelInboundHandlerAdapter {

    public void channelRead(ChannelHandlerContext ctx, Object msg)
            throws Exception {
        //開始對伺服器的響應做處理
        FullHttpResponse httpResponse = (FullHttpResponse)msg;
        System.out.println(httpResponse.headers());
        ByteBuf content = httpResponse.content();
        System.out.println(content.toString(CharsetUtil.UTF_8));
        content.release();

    }
}

二、服務端

服務端啟動類

/**
 * @author yun
 * 類說明：
 */
public class HttpServer {
    public static final int port = 6789; //設定服務端埠
    private static EventLoopGroup group = new NioEventLoopGroup();
    private static ServerBootstrap b = new ServerBootstrap();
    private static final boolean SSL = false;

    public static void main(String[] args) throws Exception {
        final SslContext sslCtx;
        if (SSL) {
            //netty為我們提供的ssl加密，預設
            SelfSignedCertificate ssc = new SelfSignedCertificate();
            sslCtx = SslContextBuilder.forServer(ssc.certificate(),
                    ssc.privateKey()).build();
        } else {
            sslCtx = null;
        }
        try {
            b.group(group);
            b.channel(NioServerSocketChannel.class);
            b.childHandler(new ServerHandlerInit(sslCtx));
            // 伺服器繫結埠監聽
            ChannelFuture f = b.bind(port).sync();
            System.out.println("服務端啟動成功,埠是:"+port);
            // 監聽伺服器關閉監聽
            f.channel().closeFuture().sync();
        } finally {
            group.shutdownGracefully();
        }
    }
}

服務端channel初始器

/**
 * @author yun
 * 類說明：
 */
public class ServerHandlerInit extends ChannelInitializer<SocketChannel> {

    private final SslContext sslCtx;

    public ServerHandlerInit(SslContext sslCtx) {
        this.sslCtx = sslCtx;
    }

    @Override
    protected void initChannel(SocketChannel ch) throws Exception {
        ChannelPipeline ph = ch.pipeline();
        if (sslCtx != null) {
            ph.addLast(sslCtx.newHandler(ch.alloc()));
        }
        //http響應編碼
        ph.addLast("encode",new HttpResponseEncoder());
        //http請求編碼
        ph.addLast("decode",new HttpRequestDecoder());
        //聚合http請求
        ph.addLast("aggre",
                new HttpObjectAggregator(10*1024*1024));
        //啟用http壓縮
        ph.addLast("compressor",new HttpContentCompressor());
        //自己的業務處理
        ph.addLast("busi",new BusiHandler());

    }
}

服務端業務處理器

/**
 * @author yun
 * 類說明：
 */
public class BusiHandler extends ChannelInboundHandlerAdapter {
    private String result="";

    private void send(String content, ChannelHandlerContext ctx,
                      HttpResponseStatus status){
        FullHttpResponse response =
                new DefaultFullHttpResponse(HttpVersion.HTTP_1_1,status,
                        Unpooled.copiedBuffer(content,CharsetUtil.UTF_8));
        response.headers().set(HttpHeaderNames.CONTENT_TYPE,
                "text/plain;charset=UTF-8");
        ctx.writeAndFlush(response).addListener(ChannelFutureListener.CLOSE);

    }

    /*
     * 收到訊息時，返回資訊
     */
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg)
            throws Exception {
        String result="";
        //接收到完成的http請求
        FullHttpRequest httpRequest = (FullHttpRequest)msg;

        try{
            String path = httpRequest.uri();
            String body = httpRequest.content().toString(CharsetUtil.UTF_8);
            HttpMethod method = httpRequest.method();
            if(!"/test".equalsIgnoreCase(path)){
                result = "非法請求："+path;
                send(result,ctx,HttpResponseStatus.BAD_REQUEST);
                return;
            }

            //處理http GET請求
            if(HttpMethod.GET.equals(method)){
                System.out.println("body:"+body);
                result="Get request,Response="+RespConstant.getNews();
                send(result,ctx,HttpResponseStatus.OK);
            }

            //處理http POST請求
            if(HttpMethod.POST.equals(method)){
                //.....

            }

        }catch(Exception e){
            System.out.println("處理請求失敗!");
            e.printStackTrace();
        }finally{
            httpRequest.release();
        }
    }

    /*
     * 建立連線時，返回訊息
     */
    @Override
    public void channelActive(ChannelHandlerContext ctx)
            throws Exception {
        System.out.println("連線的客戶端地址:"
                + ctx.channel().remoteAddress());
    }
}

常量類

/**
 * @author yun
 * 類說明：
 */
public class RespConstant {
    private static final String[] NEWS = {
            "她那時候還太年輕，不知道所有命運贈送的禮物，早已在暗中標好了" +
                    "價格。——斯蒂芬·茨威格《斷頭皇后》",
            "這是一個最好的時代，也是一個最壞的時代；" +
            "這是一個智慧的年代，這是一個愚蠢的年代；\n" +
            "這是一個信任的時期，這是一個懷疑的時期；" +
            "這是一個光明的季節，這是一個黑暗的季節；\n" +
            "這是希望之春，這是失望之冬；" +
            "人們面前應有盡有，人們面前一無所有；\n" +
            "人們正踏上天堂之路，人們正走向地獄之門。 —— 狄更斯《雙城記》",
            };

    private static final Random R = new Random();

    public static String getNews(){
        return NEWS[R.nextInt(NEWS.length)];
    }

}

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