• netty第一个例子


    引入netty

    <dependency>
        <groupId>io.netty</groupId>
        <artifactId>netty-all</artifactId>
        <version>4.1.25.Final</version>
    </dependency>
    

      

    服务器端代码

    import io.netty.buffer.ByteBuf;
    import io.netty.channel.ChannelHandlerContext;
    import io.netty.channel.ChannelInboundHandlerAdapter;
    import io.netty.util.ReferenceCountUtil;
    
    public class DiscardSServerHandler extends ChannelInboundHandlerAdapter {
    
        @Override
        public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
            ByteBuf in = (ByteBuf) msg;
    
            try {
                while(in.isReadable()) {
                    System.out.println((char)in.readByte());
                    System.out.flush();
                }
            } finally {
                ReferenceCountUtil.release(msg);
            }
        }
    
        @Override
        public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
            cause.printStackTrace();
            ctx.close();
        }
    }
    

      

    import io.netty.bootstrap.ServerBootstrap;
    import io.netty.channel.ChannelFuture;
    import io.netty.channel.ChannelInitializer;
    import io.netty.channel.ChannelOption;
    import io.netty.channel.EventLoopGroup;
    import io.netty.channel.nio.NioEventLoopGroup;
    import io.netty.channel.socket.SocketChannel;
    import io.netty.channel.socket.nio.NioServerSocketChannel;
    
    public class DiscardServer {
        public static void main(String[] args) throws Exception {
            int port = 8080;
            if(args.length > 0) {
                port = Integer.parseInt(args[0]);
            }
    
            new DiscardServer(port).run();
        }
    
        private int port;
    
        public DiscardServer(int port) {
            this.port = port;
        }
    
        public void run() throws Exception {
            EventLoopGroup bossGroup = new NioEventLoopGroup();
            EventLoopGroup workerGroup = new NioEventLoopGroup();
    
            try {
                ServerBootstrap b = new ServerBootstrap();
                b.group(bossGroup, workerGroup)
                        .channel(NioServerSocketChannel.class)
                        .childHandler(new ChannelInitializer<SocketChannel>() {
                            @Override
                            protected void initChannel(SocketChannel ch) throws Exception {
                                ch.pipeline().addLast(new DiscardSServerHandler());
                            }
                        })
                        .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();
            }
        }
    }
    

     

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  • 原文地址:https://www.cnblogs.com/wylwyl/p/10742365.html
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