package com.stono;

import java.io.IOException;

import java.io.InputStream;

import java.net.ServerSocket;

import java.net.Socket;

public class IOServer {

    public static void main(String[] args) throws IOException {

        ServerSocket serverSocket = new ServerSocket(8000);

        new Thread(() -> {

            while (true) {

                try{

                    Socket socket = serverSocket.accept();

                    new Thread(() -> {

                        try{

                            byte[] data = new byte[1024];

                            InputStream inputStream = socket.getInputStream();

                            while (true) {

                                int len;

                                while ((len = inputStream.read(data)) != -1) {

                                    System.out.println(new String(data, 0, len));

                                }

                            }

                        }catch (Exception e){

                        }

                    }).start();

                }catch (Exception e){

                }

            }

        }).start();

    }

}

package com.stono;

import java.net.Socket;

import java.util.Date;

public class IOClient {

    public static void main(String[] args) {

        new Thread(() -> {

            try {

                Socket socket = new Socket("127.0.0.1", 8000);

                while (true) {

                    try {

                        socket.getOutputStream().write((new Date() + ": hello world").getBytes());

                        socket.getOutputStream().flush();

                        Thread.sleep(2000);

                    } catch (Exception e) {

                        e.printStackTrace();

                    }

                }

            } catch (Exception e) {

                e.printStackTrace();

            }

        }).start();

    }

}

package com.stono;

import io.netty.bootstrap.ServerBootstrap;

import io.netty.channel.ChannelHandlerContext;

import io.netty.channel.ChannelInitializer;

import io.netty.channel.SimpleChannelInboundHandler;

import io.netty.channel.nio.NioEventLoopGroup;

import io.netty.channel.socket.nio.NioServerSocketChannel;

import io.netty.channel.socket.nio.NioSocketChannel;

import io.netty.handler.codec.string.StringDecoder;

public class NettyServer {

    public static void main(String[] args) {

        ServerBootstrap serverBootstrap = new ServerBootstrap();

        NioEventLoopGroup boos = new NioEventLoopGroup();

        NioEventLoopGroup worker = new NioEventLoopGroup();

        serverBootstrap

                .group(boos, worker)

                .channel(NioServerSocketChannel.class)

                .childHandler(new ChannelInitializer<NioSocketChannel>() {

                    @Override

                    protected void initChannel(NioSocketChannel ch) throws Exception {

                        ch.pipeline().addLast(new StringDecoder());

                        ch.pipeline().addLast(new SimpleChannelInboundHandler<String>() {

                            @Override

                            protected void channelRead0(ChannelHandlerContext channelHandlerContext, String s) throws Exception {

                                System.out.println(s);

                            }

                        });

                    }

                })

                .bind(8000);

    }

}

package com.stono;

import io.netty.bootstrap.Bootstrap;

import io.netty.channel.Channel;

import io.netty.channel.ChannelInitializer;

import io.netty.channel.EventLoopGroup;

import io.netty.channel.nio.NioEventLoopGroup;

import io.netty.channel.socket.nio.NioSocketChannel;

import io.netty.handler.codec.string.StringEncoder;

import java.util.Date;

import java.util.concurrent.TimeUnit;

public class NettyClient {

    public static void main(String[] args) throws InterruptedException {

        Bootstrap bootstrap = new Bootstrap();

        NioEventLoopGroup group = new NioEventLoopGroup();

        bootstrap.group(group)

                .channel(NioSocketChannel.class)

                .handler(new ChannelInitializer<Channel>() {

                    @Override

                    protected void initChannel(Channel channel) throws Exception {

                        channel.pipeline().addLast(new StringEncoder());

                    }

                });

        Channel channel = bootstrap.connect("127.0.0.1", 8000).channel();

        while (true) {

            channel.writeAndFlush(new Date() + ": hello world");

            TimeUnit.SECONDS.sleep(2);

        }

    }

}