Netty服务端启动

netty服务端启动

server demo

来源 netty in action

package com.zc.netty.action.demo.time;

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

/**
 * 时间服务器
 */
public class TimeServer {

    private int port;

    public TimeServer(int port) {
        this.port = port;
    }

    public static void main(String[] args) throws Exception {
        int port;
        if (args.length > 0) {
            port = Integer.parseInt(args[0]);
        } else {
            port = 8080;
        }
        new TimeServer(port).run();
    }

    public void run() throws Exception {
        EventLoopGroup bossGroup = new NioEventLoopGroup(); // (1)
        EventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap b = new ServerBootstrap(); // (2)
            b.group(bossGroup, workerGroup)
                    .channel(NioServerSocketChannel.class) // (3)
                    .childHandler(new ChannelInitializer<SocketChannel>() { // (4)
                        @Override
                        public void initChannel(SocketChannel ch) throws Exception {
                            ch.pipeline().addLast(new TimeServerHandler());
                        }
                    })
                    .childOption(ChannelOption.SO_KEEPALIVE, true); // (6)

            // 绑定端口,等待客户端连接
            ChannelFuture f = b.bind(port).sync(); // (7)

            // 等待服务器  socket 关闭 。
            // 在这个例子中，这不会发生，但你可以优雅地关闭你的服务器。
            f.channel().closeFuture().sync();
        } finally {
            workerGroup.shutdownGracefully();
            bossGroup.shutdownGracefully();

        }
    }
}

流程

很多逻辑和客户端类似
// TODO
ServerBootstrap 启动
设置并绑定 Reactor 线程池
设置并绑定服务端 Channel
链路建立的时候创建并初始化 ChannelPipeline
初始化 ChannelPipeline 完成之后，添加并设置 ChannelHandler
绑定并启动监听端口
Selector 轮询