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Event Handler: It consists of multiple callback methods, which constitute an application-related feedback mechanism for an event. There is no event handler mechanism in the Java NIO field for us to call or make callbacks, but we write our own code. Netty has made an upgrade in the role of event handler compared with Java NIO. It provides us developers with a large number of callback methods for us to implement corresponding callback methods for business logic processing when specific events are generated, namely ChannelHandler. The methods in ChannelHandler correspond to callbacks to each event.这时，就听外面有人喊大少爷，然后屋外旋风般地窜进一个人，却是板栗。1. Return to + PONG.可是，她们顺着河流跑了好远，也没看见板栗的影子。可是听他们掰来扯去的，越说越听不懂，也就没劲儿了，只盼着夫子赶紧下学——往常这时候都已经下学了哩。We can also specify the number of the new rule when adding the rule, so that we can insert the rule anywhere. We just need to slightly modify the command just now, as follows.