在Linux系统中用C语言实现的HTTP协议的POST和GET请求，下面是代码实现，如果要测试需要搭建个后台服务器的环境，作者测试用的是PHP开发环境，具体搭建可参看：
demo.c
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
int main(int argc, char *argv[])
{
unsigned short port = 80; // 服务器的端口号
char *server_ip = "192.168.2.203"; // 服务器ip地址
int sockfd = socket(AF_INET, SOCK_STREAM, 0);// 创建TCP套接字
if(sockfd < 0)
{
perror("socket");
exit(-1);
}
struct sockaddr_in server_addr; //定义服务器信息结构体
bzero(&server_addr,sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(port);
inet_pton(AF_INET, server_ip, &server_addr.sin_addr);
int err_log = connect(sockfd, (struct sockaddr*)&server_addr, sizeof(server_addr)); // 主动连接服务器
if(err_log != 0)
{
perror("connect");
close(sockfd);
exit(-1);
}
char str1[1024] = "";
char data[]="username=hanbo&num=123"; //POST 数据
#if 1//POST 格式请求
sprintf(str1, "%s\r\n","POST http://192.168.2.203/index.php HTTP/1.1"); //http://192.168.2.203/index.php 服务端接收数据处理文件地址
sprintf(str1, "%s%s\r\n",str1,"Accept: image/jpeg, application/x-ms-application, image/gif, application/xaml+xml, image/pjpeg, application/x-ms-xbap, application/x-shockwave-flash, application/msword, application/vnd.ms-powerpoint, application/vnd.ms-excel, */*");
sprintf(str1, "%s%s\r\n",str1,"Referer: */*");
sprintf(str1, "%s%s\r\n",str1,"Accept-Language: en-US,zh-CN;q=0.5");
sprintf(str1, "%s%s\r\n",str1,"User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; qdesk 2.4.1265.203; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; InfoPath.3)");
sprintf(str1, "%s%s\r\n",str1,"Content-Type: application/x-www-form-urlencoded");
sprintf(str1, "%s%s\r\n",str1,"Accept-Encoding: gzip, deflate");
sprintf(str1, "%s%s\r\n",str1,"Host: 192.168.2.203"); //服务器地址
sprintf(str1, "%s%s%d\r\n",str1,"Content-Length: ",strlen(data)); //数据长度
sprintf(str1, "%s%s\r\n",str1,"Connection: Keep-Alive");
sprintf(str1,"%s%s\r\n",str1,"Cache-Control: no-cache");
sprintf(str1, "%s\r\n",str1); //多加个回车
sprintf(str1, "%s%s\r\n",str1,data);
#else //GET 格式请求
sprintf(str1, "%s\r\n","GET http://192.168.2.203/index.php?username=hanbo&num=123 HTTP/1.1"); //服务端接收数据处理文件地址,并带参数
sprintf(str1, "%s%s\r\n",str1,"Accept: image/jpeg, application/x-ms-application, image/gif, application/xaml+xml, image/pjpeg, application/x-ms-xbap, application/x-shockwave-flash, application/msword, application/vnd.ms-powerpoint, application/vnd.ms-excel, */*");
sprintf(str1, "%s%s\r\n",str1,"Accept-Language: en-US,zh-CN;q=0.5");
sprintf(str1, "%s%s\r\n",str1,"User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; qdesk 2.4.1265.203; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; InfoPath.3)");
sprintf(str1, "%s%s\r\n",str1,"Accept-Encoding: gzip, deflate");
sprintf(str1, "%s%s\r\n",str1,"Host: 192.168.2.203"); //服务器地址
sprintf(str1, "%s%s\r\n",str1,"Connection: Keep-Alive");
sprintf(str1,"%s%s\r\n",str1,"Cookie: JSESSIONID=5386A9443729D7EB0B61E38A9C7CF52F");
sprintf(str1, "%s\r\n",str1);
#endif
printf("----------------------------- HTTP Data ----------------------------------\n");
printf("%s",str1);
printf("--------------------------- Data Len=%d ----------------------------------\n\n",strlen(str1));
int ret=send(sockfd, str1, strlen(str1), 0); // 向服务器发送信息
if(ret<0)
{
perror("send");
close(sockfd);
exit(-1);
}
char recv_buf[521]="";
recv(sockfd, recv_buf, sizeof(recv_buf), 0);
printf("------------------------ server retrun data -------------------------------\n");
printf("%s\n\n",recv_buf);
close(sockfd);
return 0;
}
在搭建好的服务端，在Apache安装目录D:\AppServ\Apache24\htdocs 中新建文件index.php内容如下：
<?php
/* 接收POST 格式数据处理 */
echo "username=".$_POST['username'];
echo "\nnum=".$_POST['num'];
/* 接收GET 格式数据处理 */
// echo "username=".$_GET['username'];
// echo "\nnum=".$_GET['num'];
?>
运行POST请求会出现如下结果：
----------------------------- HTTP Data ----------------------------------
POST http://192.168.2.203/index.php HTTP/1.1
Accept: image/jpeg, application/x-ms-application, image/gif, application/xaml+xml, image/pjpeg, application/x-ms-xbap, application/x-shockwave-flash, application/msword, application/vnd.ms-powerpoint, application/vnd.ms-excel, */*
Referer: */*
Accept-Language: en-US,zh-CN;q=0.5
User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; qdesk 2.4.1265.203; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; InfoPath.3)
Content-Type: application/x-www-form-urlencoded
Accept-Encoding: gzip, deflate
Host: 192.168.2.203
Content-Length: 22
Connection: Keep-Alive
Cache-Control: no-cache
username=hanbo&num=123
--------------------------- Data Len=701 ----------------------------------
------------------------ server retrun data -------------------------------
HTTP/1.1 200 OK
Date: Mon, 06 Jun 2016 02:40:28 GMT
Server: Apache/2.4.10 (Win32) PHP/5.5.25
X-Powered-By: PHP/5.5.25
Content-Length: 22
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html
username=hanbo
num=123
运行GET请求会出现如下结果：
----------------------------- HTTP Data ----------------------------------
GET http://192.168.2.203/index.php?username=hanbo&num=123 HTTP/1.1
Accept: image/jpeg, application/x-ms-application, image/gif, application/xaml+xml, image/pjpeg, application/x-ms-xbap, application/x-shockwave-flash, application/msword, application/vnd.ms-powerpoint, application/vnd.ms-excel, */*
Accept-Language: en-US,zh-CN;q=0.5
User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; qdesk 2.4.1265.203; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; InfoPath.3)
Accept-Encoding: gzip, deflate
Host: 192.168.2.203
Connection: Keep-Alive
Cookie: JSESSIONID=5386A9443729D7EB0B61E38A9C7CF52F
--------------------------- Data Len=644 ----------------------------------
------------------------ server retrun data -------------------------------
HTTP/1.1 200 OK
Date: Mon, 06 Jun 2016 02:42:52 GMT
Server: Apache/2.4.10 (Win32) PHP/5.5.25
X-Powered-By: PHP/5.5.25
Content-Length: 22
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html
username=hanbo
num=123