ServerApp.java

package ru.tinkoff.semenov;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import io.netty.handler.stream.ChunkedWriteHandler;

public class ServerApp {

    private static final String HOST = "localhost";
    private static final int PORT = 8189;

    public static void main(String[] args) {
        EventLoopGroup bossGroup = new NioEventLoopGroup(1);
        EventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap bootstrap = new ServerBootstrap();
            bootstrap.group(bossGroup, workerGroup)
                    .channel(NioServerSocketChannel.class)
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel socketChannel) {
                            ChannelPipeline pipeline = socketChannel.pipeline();
                            pipeline.addLast("stringDecoder", new StringDecoder());
                            pipeline.addLast("stringEncoder", new StringEncoder());
                            pipeline.addLast("chunkedWriter", new ChunkedWriteHandler());
                            pipeline.addLast("defaultHandler", new MainHandler());
                        }
                    });
            ChannelFuture future = bootstrap.bind(HOST, PORT).sync();
            future.channel().closeFuture().sync();
        } catch (Exception e) {
            throw new RuntimeException(e);
        } finally {
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }
}