netty 案例，netty4.1 基础入门篇一《嗨！NettyServer》

itstack-demo-netty-1-01
└── src
    ├── main
    │   └── java
    │       └── org.itstack.demo.netty.server
    │           ├── MyChannelInitializer.java
    │           └── NettyServer.java
    └── test
         └── java
             └── org.itstack.demo.netty.test
                 └── ApiTest.java

package org.itstack.demo.netty.server;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
/**
 * 公众号：bugstack虫洞栈  ｛获取学习源码｝
 * 博  客：http://itstack.org
 * 论  坛：http://bugstack.cn
 * Create by fuzhengwei on 2019/7/20
 * 一个简单的Netty服务端示例
 */
public class NettyServer {
    public static void main(String[] args) {
        new NettyServer().bing(7397);
    }
    private void bing(int port) {
        //配置服务端NIO线程组
        EventLoopGroup parentGroup = new NioEventLoopGroup(); //NioEventLoopGroup extends MultithreadEventLoopGroup Math.max(1, SystemPropertyUtil.getInt("io.netty.eventLoopThreads", NettyRuntime.availableProcessors() * 2));
        EventLoopGroup childGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap b = new ServerBootstrap();
            b.group(parentGroup, childGroup)
                    .channel(NioServerSocketChannel.class)    //非阻塞模式
                    .option(ChannelOption.SO_BACKLOG, 128)
                    .childHandler(new MyChannelInitializer());
            ChannelFuture f = b.bind(port).sync();
            f.channel().closeFuture().sync();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            childGroup.shutdownGracefully();
            parentGroup.shutdownGracefully();
        }
    }
}