netty 기반 간단 한 채 팅 방

package nettyDemon03;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioSocketChannel;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class MyChatClient {
    public static void main(String[] args) throws InterruptedException, IOException {
        EventLoopGroup eventLoopGroup = new NioEventLoopGroup();
        try {
            Bootstrap bootstrap = new Bootstrap();
            bootstrap.group(eventLoopGroup)
                    .channel(NioSocketChannel.class)
                    .handler(new MyChatClientInit());
            ChannelFuture channelFuture = bootstrap.connect("localhost", 8899).sync();
////////////////////////////////
            Channel channel = channelFuture.channel();
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
            for (; true; ) {
                channel.writeAndFlush(bufferedReader.readLine() + "\r
");
            }

        } finally {
            eventLoopGroup.shutdownGracefully();
        }
    }
}

package nettyDemon03;

import com.google.common.base.Charsets;
import io.netty.channel.*;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.DelimiterBasedFrameDecoder;
import io.netty.handler.codec.Delimiters;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;

public class MyChatClientInit extends ChannelInitializer {
    @Override
    protected void initChannel(SocketChannel ch) throws Exception {
        ChannelPipeline pipeline = ch.pipeline();
        pipeline.addLast(new DelimiterBasedFrameDecoder(4096, Delimiters.lineDelimiter()));
        pipeline.addLast(new StringDecoder(Charsets.UTF_8));
        pipeline.addLast(new StringEncoder(Charsets.UTF_8));
///////////////////////////////
        pipeline.addLast(new MyChatClientHandler());
    }
}

class MyChatClientHandler extends SimpleChannelInboundHandler {

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, String msg) throws Exception {

        Channel channel = ctx.channel();

        channel.writeAndFlush("--------------------->>>>>>>>>>>>>>>>>>>>>>>>>>>>>>");

        System.out.println(msg + "...");

    }
}

package nettyDemon03;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;

public class MyChatServer {
    public static void main(String[] args) throws InterruptedException {
        EventLoopGroup boss = new NioEventLoopGroup();
        EventLoopGroup worker = new NioEventLoopGroup();

        try {
            ServerBootstrap serverBootstrap = new ServerBootstrap();
            serverBootstrap.group(boss, worker)
                    .channel(NioServerSocketChannel.class)
                    .childHandler(new MyChatServerInit());

            ChannelFuture channelFuture = serverBootstrap.bind(8899).sync();

            channelFuture.channel().closeFuture().sync();
        } finally {
            boss.shutdownGracefully();
            worker.shutdownGracefully();
        }
    }
}

package nettyDemon03;

import com.google.common.base.Charsets;
import io.netty.channel.*;
import io.netty.channel.group.ChannelGroup;
import io.netty.channel.group.DefaultChannelGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.DelimiterBasedFrameDecoder;
import io.netty.handler.codec.Delimiters;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import io.netty.util.concurrent.GlobalEventExecutor;

public class MyChatServerInit extends ChannelInitializer {
    @Override
    protected void initChannel(SocketChannel ch) throws Exception {
        ChannelPipeline pipeline = ch.pipeline();
        pipeline.addLast(new DelimiterBasedFrameDecoder(4096, Delimiters.lineDelimiter()));
        pipeline.addLast(new StringDecoder(Charsets.UTF_8));
        pipeline.addLast(new StringEncoder(Charsets.UTF_8));
///////////////////////////////
        pipeline.addLast(new MyChatServerHandler());
    }
}

class MyChatServerHandler extends SimpleChannelInboundHandler {

    private static ChannelGroup channelGroup = new DefaultChannelGroup(GlobalEventExecutor.INSTANCE);

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, String msg) throws Exception {
        Channel channel = ctx.channel();

        channelGroup.forEach(ch -> {
            if (channel != ch) {
                ch.writeAndFlush(channel.remoteAddress() + "       " + msg + "
");
            } else {
                ch.writeAndFlush("  ：" + msg + "
");
            }
        });
    }


    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        Channel channel = ctx.channel();
        channelGroup.writeAndFlush("    -------- 》" + channel.remoteAddress() + "   -----《
");
        channelGroup.add(channel);
    }


    @Override
    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
        Channel channel = ctx.channel();

        channelGroup.remove(channel);

        channelGroup.writeAndFlush("    -------- 》" + channel.remoteAddress() + "   -----《");
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        Channel channel = ctx.channel();
        System.out.println(channel.remoteAddress() + "    ");
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        Channel channel = ctx.channel();
        System.out.println(channel.remoteAddress() + "    ");
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        cause.printStackTrace();
        ctx.channel().close();
    }
}