上篇文章中我们梳理了ChannelPipeline中入站事件的传播，这篇文章中我们看下出站事件的传播，也就是ChannelOutboundHandler接口的实现。
1、出站事件的传播示例
我们对上篇文章中的示例代码进行改造，在ChannelPipeline中加入ChannelOutboundHandler出站实现
```
public class ServerApp {
public static void main(String[] args) {
EventLoopGroup boss = new NioEventLoopGroup();
EventLoopGroup work = new NioEventLoopGroup(2);
try {
ServerBootstrap bootstrap = new ServerBootstrap();
bootstrap.group(boss, work).channel(NioServerSocketChannel.class)
.childHandler(new ChannelInitializer() {
@Override
public void initChannel(SocketChannel ch) throws Exception {
ChannelPipeline p = ch.pipeline();
// p.addLast(new LoggingHandler(LogLevel.INFO));
// 向ChannelPipeline中添加自定义channelHandler