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The Liskov Substitution Principle (LSP) is one of the basic principles of object-oriented design. The Richter substitution principle says that wherever a base class can appear, subclasses can certainly appear. LSP is the cornerstone of inheritance reuse. Only when derivative classes can replace base classes and the functions of software units are not affected can base classes be truly reused, and derivative classes can also add new behaviors to base classes. The Richter substitution principle is a supplement to the "open-close" principle. The key step to realize the "open-close" principle is abstraction. The inheritance relationship between the base class and the subclass is the concrete realization of abstraction, so the Richter substitution principle is the specification of the concrete steps to realize abstraction. --From Baidu"Animals? Is it our common animal? Still can fly? What is that?"故事继续讲述了小北、小东等人的故事。小北一直忙于训练熊猫趴趴而冷淡小东，小东拜托兔爷做了枚可以迚入趴趴意识的戒指，打算代替趴趴表演，但是却阴巩阳错的被小西戴上，并迚入一位笨笨的销售小姐意识里，作为广告精英的小西无意中帮助了这位笨笨的小姐成功的说朋了一位客户。开心的忘乎所以的小姐不小心撞到了脑袋，小西终于回到自巪的身体，却发现当时留在公交车上的自巪的身体被人误认为植物人上了微薄，并且因为旷工还被老板娘骂。不明所以的小西倍感莫名其妙的一天。成本就沿滩而置？暂时。宋慈命犯天煞孤星，本以为就此孤独终老。然而天无绝人之路，绝境逢生的他不仅自此平步青云，当上了提点刑狱司，还娶了两位貌美如花的夫人唐思和聂枫。宋慈好不得意，以为命中天煞孤星自此破解。在携带两位夫人一起前往谭州任职途中，路经兴隆府恰巧遇上了一起凶案。兴隆府允得知大名鼎鼎的提点刑狱司宋慈路经此处，于是请他出手帮忙破案。宋慈仗义出手，岂料两位爱妻竟因此葬身火海。万年俱灰的宋慈于是辞官归隐，回乡途中所搭乘的船只又碰上了暴风雨，宋慈跌入了怒海中。一日，松山县捕快展杰在沙滩发现了奄奄一息的宋慈，于是将他送往了当地的义庄。守义庄的阿虫在偷宋慈身上的玉佩时意外令他恢复了知觉。随后，专门替死人化妆的玉珠和阿虫返回时看见宋慈拿着刀走向一名女尸，以为他有什么不轨行为，于是上前阻止。原来宋慈竟是为女尸接生!于是，宋慈在松山县又开始了一幕幕精彩的洗冤实录。This paper mainly analyzes Reactor mode in detail. Netty uses Reactor mode to realize asynchronous event-driven network application framework, so it is very important to master Reactor mode in Netty's learning.