Netty学习(一)使用官网例子快速开发一个服务器

Netty学习(一)使用官网例子快速开发一个服务器

说明

• 使用netty4.1.13版本
• oracle-jdk-1.8.0_131

代码托管

https://code.csdn.net/u012995856/mynetty/tree/master

代码

DiscardServerHandler

package cn.pangpython.mynetty.main;import io.netty.buffer.ByteBuf;import io.netty.channel.ChannelHandlerContext;import io.netty.channel.ChannelInboundHandlerAdapter;import io.netty.util.ReferenceCountUtil;/** * @Project MyNetty * @Package cn.pangpython.mynetty.main * @Author pangPython * @Time 上午7:42:42 */public class DiscardServerHandler extends ChannelInboundHandlerAdapter{    @Override    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {         ByteBuf in = (ByteBuf) msg;            try {                while (in.isReadable()) { // (1)                    //打印请求信息                    System.out.print((char) in.readByte());                    System.out.flush();                }            } finally {                //释放                ReferenceCountUtil.release(msg); // (2)            }    }    @Override    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {        // TODO Auto-generated method stub        cause.printStackTrace();        ctx.close();    }}

DiscardServer

package cn.pangpython.mynetty.main;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;/** * @Project MyNetty * @Package cn.pangpython.mynetty.main * @Author pangPython * @Time 上午7:49:34 */public class DiscardServer {     private int port;        public DiscardServer(int port) {            this.port = port;        }        public void run() throws Exception {            EventLoopGroup bossGroup = new NioEventLoopGroup(); // (1)            EventLoopGroup workerGroup = new NioEventLoopGroup();            try {                ServerBootstrap b = new ServerBootstrap(); // (2)                b.group(bossGroup, workerGroup)                 .channel(NioServerSocketChannel.class) // (3)                 .childHandler(new ChannelInitializer<SocketChannel>() { // (4)                     @Override                     public void initChannel(SocketChannel ch) throws Exception {                         ch.pipeline().addLast(new DiscardServerHandler());                     }                 })                 .option(ChannelOption.SO_BACKLOG, 128)          // (5)                 .childOption(ChannelOption.SO_KEEPALIVE, true); // (6)                // Bind and start to accept incoming connections.                //绑定并开始接受一个进来的连接                ChannelFuture f = b.bind(port).sync(); // (7)                // Wait until the server socket is closed.                // In this example, this does not happen, but you can do that to gracefully                // shut down your server.                f.channel().closeFuture().sync();            } finally {                workerGroup.shutdownGracefully();                bossGroup.shutdownGracefully();            }        }        public static void main(String[] args) throws Exception {            int port;            if (args.length > 0) {                port = Integer.parseInt(args[0]);            } else {                port = 8080;            }            new DiscardServer(port).run();        }}

访问

用浏览器访问本机8080端口

localhost:8080

访问结果