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??Maven?????Netty???

??????Netty??????Netty???????????????????pom.xml??????????????????Netty??????

?????

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
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;
public class NetttyServer {
    public static void main(String[] args) {
        EventLoopGroup boss = new NioEventLoopGroup();
        EventLoopGroup worker = new NioEventLoopGroup();
        ServerBootstrap bootstrap = new ServerBootstrap();
        bootstrap.group(boss, worker)
                .channel(NioServerSocketChannel.class)
                .childHandler(new ChannelInitializer
   
    () {
                    @Override
                    protected void initChannel(SocketChannel socketChannel) throws Exception {
                        socketChannel.pipeline()
                                .addLast("encoder", new StringEncoder())
                                .addLast("decoder", new StringDecoder())
                                .addLast("hello world handler", new HelloWorldHandler());
                    }
                });
        try {
            ChannelFuture channelFuture = bootstrap.bind(8080).sync();
            channelFuture.channel().closeFuture().sync();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            boss.shutdownGracefully();
            worker.shutdownGracefully();
        }
    }
    static class HelloWorldHandler extends ChannelInboundHandlerAdapter {
        @Override
        public void channelActive(ChannelHandlerContext ctx) throws Exception {
            System.out.println("channel Active and write back......");
            String resp = "Hello world";
            ChannelFuture future = ctx.channel().writeAndFlush(resp);
            future.sync();
            System.out.println("success:" + future.isSuccess());
        }
        @Override
        public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
            System.out.println("read msg : " + msg);
            String resp = "Hello world";
            ctx.channel().writeAndFlush(resp);
        }
    }
}
   

?????????Netty????????????????????????

   
    
    
     io.netty
    
    
    
     netty-all
    
    
    
     4.1.36.Final
    
   

??????????????????????NioEventLoopGroup??????????NioServerSocketChannel??????????Pipeline????????????????????HelloWorldHandler??????

?????????????????????8080????????????????????????????"Hello world"???????????????????????

???????????????????Netty????????????????

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