以服务端启动为例
ChannelFuture future = serverBootstrap.bind(8888).sync();
参数设置
serverBootstrap.channel(NioServerSocketChannel.class)
【AbstractBootstrap】 启动对象的父类
------------------------------------------------------------------ 
    public ChannelFuture bind(int inetPort) {
        return bind(new InetSocketAddress(inetPort));
    }
    public ChannelFuture bind(SocketAddress localAddress) {
        validate();
        return doBind(ObjectUtil.checkNotNull(localAddress, "localAddress"));
    }
    private ChannelFuture doBind(final SocketAddress localAddress) {
        final ChannelFuture regFuture = initAndRegister();
        final Channel channel = regFuture.channel();
        .......
    }
    final ChannelFuture initAndRegister() {
        Channel channel = null;
        try {
            channel = channelFactory.newChannel();
            init(channel);
        } 
        .......
    }
 【ReflectiveChannelFactory】  工厂实现类
 ------------------------------------------------------------------   
    public T newChannel() {
        try {
            return constructor.newInstance();
        } catch (Throwable t) {
            throw new ChannelException("Unable to create Channel from class " + constructor.getDeclaringClass(), t);
        }
    }