开发平台：Microsoft Visual Studio Community 2019
#include <stdio.h>
#include <winsock2.h>
#include <string.h>
#include <io.h>#pragma comment(lib, "ws2_32.lib")/*
* 网络编程 包含头文件： winsock2.h
* 引用库文件： ws2_32.lib
*/char rev_buffer[1024]; //接收信息缓冲区
char filePath[128]; //网页文件路径/**
* 主要步骤：
* 1.初始化网络库
* 2.创建socket
* 3.绑定IP地址和端口号
* 4.监听连接
* 5.接收连接
* 6.处理连接请求
* 7.关闭连接，关闭网络库
**/int main()
{//============================================================================//1.初始化网络库 WSA --> Windows Socket API//para1:指定socket版本 使用最新的2.2版本即可//para2:是一个传出参数int ret;WSADATA wsadata;ret = WSAStartup(MAKEWORD(2, 2), &wsadata);if (ret != 0){printf("WSADATA启动失败\r\n");exit(-1);}else{printf("WSADATA启动成功\r\n");}//============================================================================//2.创建socket//para1:指定IP协议 AF_INET -> IPV4 AF_INET6 -> IPV6//para2:数据传输格式 常用的有两种：流式传输（TCP） 数据包传输（UDP）//para3:传输协议：SOCKET serverSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);if (serverSocket == INVALID_SOCKET){printf("创建serverSocket失败\r\n");exit(-1);}else{printf("创建serverSocket成功\r\n");}============================================================================//3.绑定IP地址和端口号(对于服务器是绑定，对于客户端是连接)//para1: 指定socket//para2: IP地址和端口号//para3: para2的长度SOCKADDR_IN serverAddr;serverAddr.sin_family = AF_INET;//必须和创建socket时一样serverAddr.sin_addr.S_un.S_addr = INADDR_ANY;serverAddr.sin_port = htons(80);//此处涉及到大端存储和小端存储 一般计算机上都是小端的 网络上一般都是大端的 所以需要将本地字节序转为网络字节序ret = bind(serverSocket, (SOCKADDR*)&serverAddr, sizeof(serverAddr));if (ret == SOCKET_ERROR){printf("套接字绑定失败\r\n");exit(-1);}else{printf("套接字绑定成功\r\n");}//============================================================================//4.监听连接listen(serverSocket, 10);printf("服务器监听中......\r\n");//============================================================================//5.接收连接SOCKADDR clientAddr;int len_clientAddr = sizeof(clientAddr);while (1){SOCKET clientSocket = accept(serverSocket, &clientAddr, &len_clientAddr);if (clientSocket == INVALID_SOCKET){printf("建立客户端连接失败\r\n");exit(-1);}else{printf("成功建立客户端连接\r\n");}//6.处理连接请求//从clientSocket接受数据ret = recv(clientSocket, rev_buffer, sizeof(rev_buffer), 0);printf("The return of recv is:%d\r\n", ret);if (ret <= 0){printf("接收来自客户端的数据失败\r\n");printf("重新进入等待连接状态......\r\n");closesocket(clientSocket);continue;//exit(-1);}else{printf("成功接收来自客户端的数据：\r\n");printf("%s\r\n", rev_buffer);}//给客户发送网页 后续可以根据具体请求，转向不同页面strcpy(filePath, "index.html");ret = access(filePath, 0);//0 代表判断文件是否存在 如果存在返回0 否则返回-1if (ret != 0){//未找到文件char sendBuf[1024] = { 0 };sprintf(sendBuf, "HTTP/1.1 404 NOT FOUND\r\n");send(clientSocket, sendBuf, strlen(sendBuf), 0);sprintf(sendBuf, "Content-type:text/html\r\n");send(clientSocket, sendBuf, strlen(sendBuf), 0);sprintf(sendBuf, "\r\n");send(clientSocket, sendBuf, strlen(sendBuf), 0);sprintf(sendBuf, "找不到，滚！！！！\r\n");send(clientSocket, sendBuf, strlen(sendBuf), 0);}else{//找到相关网页文件FILE* fs = fopen(filePath, "r");if (fs == NULL){printf("打开网页文件失败\r\n");exit(-1);}else{char dataBuf[1024] = { 0 };sprintf(dataBuf, "http/1.1 200 success\r\n");send(clientSocket, dataBuf, strlen(dataBuf), 0);sprintf(dataBuf, "content-type:text/html\r\n");send(clientSocket, dataBuf, strlen(dataBuf), 0);sprintf(dataBuf, "\r\n");send(clientSocket, dataBuf, strlen(dataBuf), 0);do{fgets(dataBuf, 1024, fs);send(clientSocket, dataBuf, strlen(dataBuf), 0);} while (!feof(fs));fclose(fs);}}closesocket(clientSocket);//发送完直接关闭 因为HTTP协议是无连接的}//7.关闭连接，清理网络库closesocket(serverSocket);WSACleanup();return 0;
}