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2017-07-15 13:39:33年度最佳穿越者，非项少龙莫属。So let's explain the rules of iptables in a common way. There was an analogy before, Each "chain" is a "checkpoint", Every message passing through this "level" must match the rules on this level. If there is a match, The message is processed correspondingly, For example, you and I are like two "messages" at the moment. Both of you and I are going to enter the customs at this moment. But the duke has a life, Only the imposing person can enter the customs, Those who do not meet this requirement are not allowed to enter the customs. So the soldiers guarding the customs followed the "rules" formulated by the duke. I began to look at you and me. In the end, you entered the customs smoothly, and I was rejected. Because you met the standard of "dignity", you were "released", while I did not meet the standard, so I was not released. In fact, "dignity" is a kind of "matching condition", "release" is a kind of "action", and "matching condition" and "action" form the rules.田遥站在一边听着他立誓，沉默不言。Call function chainFn1. PassRequest (); After that, the sender Fn1 function will be executed to print out 1, and then the string nextSuccessor; will be returned.Finally, let's briefly talk about how IoC is implemented. Imagine if we implemented this dependency injection function ourselves, how would we do it? Nothing more than: