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In TCP protocol, messages arriving at the destination will enter the buffer of the TCP stack and will not be forwarded to the receiving system until the buffer is full. This is to minimize the number of times the system empties the buffer. However, the sender can force the receiving system to clear the contents of the buffer by sending a TCP message with a PSH flag of 1. The TCP PUSH + ACK attack, like the TCP SYN attack, aims to deplete the resources of the victim system. When an attacker sends TCP messages with PSH and ACK flags set to 1 to the Target host, these messages will cause the Target system to clear all TCP buffers (whether the buffers are full or not) and respond with an acknowledgement message. If this process is performed by a large number of controlled hosts, the system will not be able to process normal data, resulting in denial of service.还真是人见人爱：小时候迷老头老太太和中年人，长大了迷少男少女，将来呢？她不禁和张槐相视苦笑：终于跟海盗扯上了。胡、苗、范、田四个家族的恩恩怨怨皆起源于一个传说：明末李闯王起义失败后，留下了一个收尽人间财富的宝藏，而通往宝藏的钥匙分别由闯王的四大护法胡、苗、范、田四人保管。由于宝藏的巨大魔力，江湖上、朝廷中从来就没有停止过对这四个家族极其传人的搜捕，甚至这四家传人都在相互明争暗斗，人人都想将宝藏占为己有。System.out.println ("this is the second sub! ");你要记住，我以后的成就绝对超出你的想象，所以你的身份绝不比一些知名企业家老板差，只要你能看上，就尽情去追。原来他们都看错了，小龙女从来就没有冷漠无情过。What is called here is the event pool mentioned at the beginning. First, see if there are any event objects that can be reused. If not, instance one again.