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Here, the filter gateway mainly indicates the firewall, and of course the router can also become the filter gateway. Firewall is deployed between different networks to prevent foreign illegal attacks and the leakage of confidential information. It is located between the client and the server. Using it to protect SYN attacks can play a very good role. Filter gateway protection mainly includes timeout setting, SYN gateway and SYN agent.范依兰气的咬牙启齿，有些事情还是要不可避免地发生。Defines an interface for creating objects, allowing subclasses to decide which class to instantiate. Factory methods delay the instantiation of a class to its subclasses.1940年3月，汪伪政府宣布成立。侵华日军在上海大肆搜捕抗日志士，汪伪组建由前国民党军官毕忠良担任处长的“特别行动处”为虎作伥。一直潜伏在毕忠良身边、代号“麻雀”的中共党员陈深，与组织暂时失去联系。置身虎视狼顾的险境中，陈深信仰坚定，冒死营救上线“宰相”及抗日志士。毕忠良老奸巨猾，虽与救命恩人陈深“情同兄弟”，却对其产生怀疑，设重重陷阱步步紧逼。“宰相”牺牲后，陈深终于找到新上线“医生”并受命拿到日军代号为“归零”的重要作战计划。陈深的昔日恋人徐碧城，与另一国军情报人员唐山海假扮夫妻潜伏进特别行动处，在多次行动中给陈深制造麻烦和危机。智计过人的陈深身处连环杀机之中，巧妙利用日本鬼子、汪伪分子等各派势力之间的微妙缝隙，同时也付出了巨大的代价，最终成功地获取了“归零”计划，挫败了日本侵略者的阴谋。杜松，你们就守在这里。Public void setState (State state) {