网络编程之Socket通信原理,TCP 、UDP、IPv4 IPv6地址,网络原理基础

小鱼儿 2024-04-17 05:26 72阅读 0赞

相关博客网址：https://www.cnblogs.com/wangcq/p/3520400.html  
本帖内容来源于网络，如有侵权请联系删除。  
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**加粗样式**

## 什么是TCP/IP、UDP？ ##

TCP/IP（Transmission Control Protocol/Internet Protocol）即传输控制协议/网间协议，定义了主机如何连入因特网及数据如何再它们之间传输的标准，  
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从字面意思来看TCP/IP是TCP和IP协议的合称，但实际上TCP/IP协议是指因特网整个TCP/IP协议族。不同于ISO模型的七个分层，TCP/IP协议参考模型把所有的TCP/IP系列协议归类到四个抽象层中  
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## Socket在哪里呢？ ##

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## Socket是什么呢？ ##

Socket是应用层与TCP/IP协议族通信的中间软件抽象层，它是一组接口。在设计模式中，Socket其实就是一个门面模式，它把复杂的TCP/IP协议族隐藏在Socket接口后面，对用户来说，一组简单的接口就是全部，让Socket去组织数据，以符合指定的协议。  
我们知道两个进程如果需要进行通讯最基本的一个前提能能够唯一的标示一个进程，在本地进程通讯中我们可以使用PID来唯一标示一个进程，但PID只在本地唯一，网络中的两个进程PID冲突几率很大，这时候我们需要另辟它径了，我们知道IP层的ip地址可以唯一标示主机，而TCP层协议和端口号可以唯一标示主机的一个进程，这样我们可以利用ip地址＋协议＋端口号唯一标示网络中的一个进程。  
能够唯一标示网络中的进程后，它们就可以利用socket进行通信了，什么是socket呢？我们经常把socket翻译为套接字，socket是在应用层和传输层之间的一个抽象层，它把TCP/IP层复杂的操作抽象为几个简单的接口供应用层调用已实现进程在网络中通信。

## 交互 ##

先从服务器端说起。服务器端先初始化Socket，然后与端口绑定(bind)，对端口进行监听(listen)，调用accept阻塞，等待客户端连接。在这时如果有个客户端初始化一个Socket，然后连接服务器(connect)，如果连接成功，这时客户端与服务器端的连接就建立了。客户端发送数据请求，服务器端接收请求并处理请求，然后把回应数据发送给客户端，客户端读取数据，最后关闭连接，一次交互结束。

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## TCP ##

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## 其他基础知识 ##

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