掃盲：tcp,udp,ip,socket,

比較好的參考文章：   http://www.javashuo.com/article/p-qmpozxff-cx.html http://www.javashuo.com/article/p-vrwldhvp-me.html https://blog.csdn.net/sinat_31057219/article/details/72872359 https://blog.csdn.net/je

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