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202. X.X.51The attacker first completes the three-way handshake to establish the connection, but in the last ACK reply of the three-way handshake, the TCP window size is set to 0, and then a data request is made. When the attack target sends the request result to the attacker, it stops the data transmission when it finds that the TCP window size is 0, and sends out a TCP window detection packet to ask the attacker if the TCP window has been updated. Since the attacker will not update the window size, the attack target will always maintain the TCP connection and wait for the data to be sent, and continuously carry out TCP window size detection. When the number of controlled hosts in the botnet is large, Target's connection table will gradually be exhausted, resulting in denial of service.　　果不其然，一批恐怖分子向拉波尔的车队发起了进攻，面对敌人强大的火力，一番恶斗之后节节败退的拉波尔一行人被迫藏身于位于荒郊的工业园内，没想到却在那里遇到了正在行窃的纳塞（萨米·纳塞利 Samy Naceri 饰）等人，本是正邪不两立的两方人马决心联手，突出重围。苏岸见此情景，稍微放下心来，看来大王的实力还是有很大提升的，还是能够应付此人的。我先为《天河魔剑录》和紫月剑默哀三分钟。雷恩是个胆小笨拙的年轻警察，多年来一直忍受着同事们的嘲笑，向暗恋的女同事斯蒂芬妮表白却连连失败。当医生宣布他只剩下30天的生命时，雷恩决定改变这一切。雷恩佯装与毒枭“老鼠”合伙，答应帮助“老鼠”盗取警方资料，实则拿到了钱就去玩乐。但很快雷恩就意识到挥霍无度的生活并非他所愿，他不想顶着loser的形象离开人世。为了给喜欢的人留下一个美好的形象记忆，为了弥补之前工作中犯下的错误，雷恩重回警局准备大干一场。与此同时，警局新来了两名缉毒警察托尼和皮埃尔。在长官的命令下，四人组成联盟，寻找证据抓获毒枭......一场猫鼠追击战在爆笑行动中展开，雷恩也在这仅剩30天的生命里成为了他一直想成为的英雄!然而还有更大的玩笑等着他......One problem with the factory method pattern is that the creation of the class depends on the factory class, that is to say, if you want to expand the program, you must modify the factory class, which violates the closure principle. Therefore, from the design point of view, there are certain problems, how to solve them? We use the abstract factory mode to create multiple factory classes, so that once new functions need to be added, we can directly add new factory classes without modifying the previous code. Because the abstract factory is not very easy to understand, let's look at the diagram first, and then it is easier to understand with the code.