之前都在解析各个类的功能缺乏对Netty整体流程的了解，本篇将Netty服务端的启动流程画一下，将之前学习的内容连接起来。

Netty启动流程

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private void serverRun() throws InterruptedException {
    EventLoopGroup boss = new NioEventLoopGroup();
    EventLoopGroup worker = new NioEventLoopGroup();

    try {
        ServerBootstrap serverBootstrap = new ServerBootstrap();
        serverBootstrap.group(boss, worker)
                .channel(NioServerSocketChannel.class)
                .childHandler(new ChannelInitializer<SocketChannel>() {
                    @Override
                    protected void initChannel(SocketChannel ch) throws Exception {
                        ch.pipeline().addLast(new HttpServerCodec());
                        ch.pipeline().addLast(new HttpObjectAggregator(1024*1024));
                        ch.pipeline().addLast(new HttpServerHandler());
                    }
                })
                .option(ChannelOption.SO_BACKLOG, 128)
        ;
        ChannelFuture future = serverBootstrap.bind(80).sync();
        future.channel().closeFuture().sync();
    }finally {
        boss.shutdownGracefully();
        worker.shutdownGracefully();
    }
}

bind过程序列图