我在阅读Netty实战的时候有这样一段描述：
我觉得这段话和这张图描述的并不够严谨，因为在我的实验中，前后是要看是入站还是出站数据的，如果是入站数据，下一个ChannelHandler在当前ChannelHandler的右侧，如果是出站数据，下一个ChannelHandler在当前ChannelHandler的左侧。我实验代码如下：
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ch.pipeline()
.addLast(new ChannelInboundHandlerAdapter() {
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
System.out.println("Running 1");
ctx.fireChannelRead(msg);
}
})
.addLast(new ChannelOutboundHandlerAdapter() {
@Override
public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
System.out.println("Running 2");
}
})
.addLast(new ChannelInboundHandlerAdapter() {
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
System.out.println("Running 3");
ctx.write(msg);
}
})
.addLast(new ChannelOutboundHandlerAdapter() {
@Override
public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
System.out.println("Running 4");
}
});
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