Netty5 服务端和客户端

• 一个thread + 队列 == 一个单线程线程池。线程安全的，任务是线性串行执行的

• 线程安全，不会产生阻塞效应 ，使用对象组

• 线程不安全，会产生阻塞效应， 使用对象池

其中 EventExecutor executor 是 NioEventLoop 线程安全

public final class NioEventLoop extends SingleThreadEventLoop

/** * netty5服务端 * * */public class Server {	public static void main(String[] args) {		//服务类		ServerBootstrap bootstrap = new ServerBootstrap();		//boss和worker		EventLoopGroup boss = new NioEventLoopGroup();		EventLoopGroup worker = new NioEventLoopGroup();		try {			//设置线程池			bootstrap.group(boss, worker);			//设置socket工厂、			bootstrap.channel(NioServerSocketChannel.class);			//设置管道工厂			bootstrap.childHandler(new ChannelInitializer
       
        () {				@Override				protected void initChannel(Channel ch) throws Exception {					ch.pipeline().addLast(new StringDecoder());					ch.pipeline().addLast(new StringEncoder());					ch.pipeline().addLast(new ServerHandler());				}			});			//netty3中对应设置如下			//bootstrap.setOption("backlog", 1024);			//bootstrap.setOption("tcpNoDelay", true);			//bootstrap.setOption("keepAlive", true);			//设置参数，TCP参数			bootstrap.option(ChannelOption.SO_BACKLOG, 2048);//serverSocketchannel的设置，链接缓冲池的大小			bootstrap.childOption(ChannelOption.SO_KEEPALIVE, true);//socketchannel的设置,维持链接的活跃，清除死链接			bootstrap.childOption(ChannelOption.TCP_NODELAY, true);//socketchannel的设置,关闭延迟发送			//绑定端口			ChannelFuture future = bootstrap.bind(10101);			System.out.println("start");			//等待服务端关闭			future.channel().closeFuture().sync();		} catch (Exception e) {			e.printStackTrace();		} finally{			//释放资源			boss.shutdownGracefully();			worker.shutdownGracefully();		}	}}
       

import io.netty.channel.ChannelHandlerContext;import io.netty.channel.SimpleChannelInboundHandler;/** * 服务端消息处理 * * */public class ServerHandler extends SimpleChannelInboundHandler
       
         {	@Override	protected void messageReceived(ChannelHandlerContext ctx, String msg) throws Exception {		System.out.println(msg);		ctx.channel().writeAndFlush("hi");		ctx.writeAndFlush("hi");	}	/**	 * 新客户端接入	 */	@Override	public void channelActive(ChannelHandlerContext ctx) throws Exception {		System.out.println("channelActive");	}	/**	 * 客户端断开	 */	@Override	public void channelInactive(ChannelHandlerContext ctx) throws Exception {		System.out.println("channelInactive");	}	/**	 * 异常	 */	@Override	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {		cause.printStackTrace();	}}
       

import java.io.BufferedReader;import java.io.InputStreamReader;import io.netty.bootstrap.Bootstrap;import io.netty.channel.Channel;import io.netty.channel.ChannelFuture;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.StringDecoder;import io.netty.handler.codec.string.StringEncoder;/** * netty5的客户端 * * */public class Client {	public static void main(String[] args) {		//服务类		Bootstrap bootstrap = new Bootstrap();		//worker		EventLoopGroup worker = new NioEventLoopGroup();		try {			//设置线程池			bootstrap.group(worker);			//设置socket工厂、			bootstrap.channel(NioSocketChannel.class);			//设置管道			bootstrap.handler(new ChannelInitializer
       
        () {				@Override				protected void initChannel(Channel ch) throws Exception {					ch.pipeline().addLast(new StringDecoder());					ch.pipeline().addLast(new StringEncoder());					ch.pipeline().addLast(new ClientHandler());				}			});			ChannelFuture connect = bootstrap.connect("127.0.0.1", 10101);			BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));			while(true){				System.out.println("请输入：");				String msg = bufferedReader.readLine();				connect.channel().writeAndFlush(msg);			}		} catch (Exception e) {			 e.printStackTrace();		} finally{			worker.shutdownGracefully();		}	}}
       

import io.netty.channel.ChannelHandlerContext;import io.netty.channel.SimpleChannelInboundHandler;/** * 客户端消息处理 * * */public class ClientHandler extends SimpleChannelInboundHandler
       
         {	@Override	protected void messageReceived(ChannelHandlerContext ctx, String msg) throws Exception {		System.out.println("客户端收到消息:"+msg);	}}