Netty中Channel、ChannelPipeline、ChannelHandler、ChannelHandlerContext之间的关系
publicinterfaceChannelextendsAttributeMap,ChannelOutboundInvoker,Comparable{//...ChannelPipelinepipeline();//...}每一个Channel被创建，就会生成一个与其绑定的ChannelPipeline。//io.netty.channel.AbstractChannelprotectedAbs