linux下HttpGet、HttpPost的C++实现

#include "httprequest.h"

int main()
{
	httprequest* http = new httprequest;
	
	char* str = (char*)malloc(bufsize);
	
	memset(str, 0, bufsize);
	if(http->httpget("https://www.baidu.com", str)) {
		printf("%s\n", str);
	} else {
		printf("https://www.baidu.com httpget请求失败!\n");
	}
	
	memset(str, 0, bufsize);	
	//安装tomcat
	if(http->httpget("127.0.0.1", str)) {
		printf("%s\n", str);
	} else {
		printf("127.0.0.1 httpget请求失败!\n");
	}

	free(str);
	return 0;
}

 

 

#ifndef __http__
#define __http__

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include       
#include 

#define bufsize 41000
#define urlsize 1024
#define invalid_socket -1
#define __debug__

class httprequest
{
	public:
		httprequest();
		~httprequest();
		void debugout(const char *fmt, ...);
		
		int httpget(const char* strurl, char* strresponse);
		int httppost(const char* strurl, const char* strdata, char* strresponse);

	private:
		int   httprequestexec(const char* strmethod, const char* strurl, const char* strdata, char* strresponse);
		char* httpheadcreate(const char* strmethod, const char* strurl, const char* strdata);
		char* httpdatatransmit(char *strhttphead, const int isockfd);
			
		int   getportfromurl(const char* strurl);
		char* getipfromurl(const char* strurl);
		char* getparamfromurl(const char* strurl);
		char* gethostaddrfromurl(const char* strurl);
		
		int   socketfdcheck(const int isockfd);	
		
		static int m_isocketfd;
};

#endif

 

 

#include "httprequest.h"

httprequest::httprequest()
{
	
}

httprequest::~httprequest()
{
	
}


/**
*	功能描述：httpget请求
*	参数说明：
*				strurl：     http请求url
*				strresponse：http请求响应
*	返 回 值：
*				1表示成功
*				0表示失败
**/
int httprequest::httpget(const char* strurl, char* strresponse)
{
	return httprequestexec("get", strurl, null, strresponse);
}


/**
*	功能描述：httppost请求
*	参数说明：
*				strurl：     http请求url
*               strdata：    post请求发送的数据
*				strresponse：http请求响应
*	返 回 值：
*				1表示成功
*				0表示失败
**/
int httprequest::httppost(const char* strurl, const char* strdata, char* strresponse)
{
	return httprequestexec("post", strurl, strdata, strresponse);
}


//执行http请求，get或post
int httprequest::httprequestexec(const char* strmethod, const char* strurl, const char* strdata, char* strresponse)
{
	//判断url是否有效
	if((strurl == null) || (0 == strcmp(strurl, ""))) {
		debugout("%s %s %d\turl为空\n", __file__, __function__, __line__); 
		return 0;
	}
	
	//限制url长度
	if(urlsize < strlen(strurl)) {
		debugout("%s %s %d\turl的长度不能超过%d\n", __file__, __function__, __line__, urlsize); 
		return 0;
	}
	
	//创建http协议头
	char* strhttphead = httpheadcreate(strmethod, strurl, strdata);
	
	//判断套接字m_isocketfd是否有效，有效就直接发送数据
	if(m_isocketfd != invalid_socket) {
		//检查socketfd是否为可写不可读状态
		if(socketfdcheck(m_isocketfd) > 0) {
			char* strresult = httpdatatransmit(strhttphead, m_isocketfd);
			if(null != strresult) {
				strcpy(strresponse, strresult);
				return 1;
			}
		}
	}

	//create socket
	m_isocketfd = invalid_socket;
	m_isocketfd = socket(af_inet, sock_stream, 0); 
    if (m_isocketfd < 0 ) { 
		debugout("%s %s %d\tsocket error! error code: %d，error message: %s\n", __file__, __function__, __line__, errno, strerror(errno)); 
		return 0;
	}
  
	//bind address and port
	int iport = getportfromurl(strurl);
	if(iport < 0) {
		debugout("%s %s %d\t从url获取端口失败\n", __file__, __function__, __line__); 
		return 0;
	}	
	char* strip = getipfromurl(strurl);
	if(strip == null) {
		debugout("%s %s %d\t从url获取ip地址失败\n", __file__, __function__, __line__);
		return 0;
	}
	struct sockaddr_in servaddr;
	bzero(&servaddr, sizeof(servaddr)); 
	servaddr.sin_family = af_inet; 
	servaddr.sin_port = htons(iport); 
	if (inet_pton(af_inet, strip, &servaddr.sin_addr) <= 0 ) { 
	  debugout("%s %s %d\tinet_pton error! error code: %d，error message: %s\n", __file__, __function__, __line__, errno, strerror(errno)); 
	  close(m_isocketfd);
	  m_isocketfd = invalid_socket;
	  return 0; 
	}
	
	//set non-blocking
	int flags = fcntl(m_isocketfd, f_getfl, 0);
	if(fcntl(m_isocketfd, f_setfl, flags|o_nonblock) == -1) {
		close(m_isocketfd);
		m_isocketfd = invalid_socket;
		debugout("%s %s %d\tfcntl error! error code: %d，error message: %s\n", __file__, __function__, __line__, errno, strerror(errno)); 
		return 0;
	}

	//非阻塞方式连接
	int iret = connect(m_isocketfd, (struct sockaddr *)&servaddr, sizeof(servaddr));
	if(iret == 0) {
		char* strresult = httpdatatransmit(strhttphead, m_isocketfd);
		if(null != strresult) {
			strcpy(strresponse, strresult);
			free(strresult);
			return 1;
		} else {
			close(m_isocketfd);
		    m_isocketfd = invalid_socket;
			free(strresult);
			return 0;
		}
	}
	else if(iret < 0) {
		if(errno != einprogress) {
			return 0;
		}
	}
	
	iret = socketfdcheck(m_isocketfd);
	if(iret > 0) {
		char* strresult = httpdatatransmit(strhttphead, m_isocketfd);
		if(null == strresult) {
			close(m_isocketfd);
		    m_isocketfd = invalid_socket;
			return 0;
		}
		else {
			strcpy(strresponse, strresult);
			free(strresult);
			return 1;
		}
	}
	else {
		close(m_isocketfd);
		m_isocketfd = invalid_socket;
		return 0;
	}
	
	return 1;
}


//构建http消息头
char* httprequest::httpheadcreate(const char* strmethod, const char* strurl, const char* strdata)
{
	char* strhost = gethostaddrfromurl(strurl);
	char* strparam = getparamfromurl(strurl);
	
	char* strhttphead = (char*)malloc(bufsize);
	memset(strhttphead, 0, bufsize);

	strcat(strhttphead, strmethod); 
	strcat(strhttphead, " /"); 
	strcat(strhttphead, strparam);
	free(strparam);
	strcat(strhttphead, " http/1.1\r\n");
	strcat(strhttphead, "accept: */*\r\n");   
	strcat(strhttphead, "accept-language: cn\r\n"); 
	strcat(strhttphead, "user-agent: mozilla/4.0\r\n");
	strcat(strhttphead, "host: "); 
	strcat(strhttphead, strhost);
	strcat(strhttphead, "\r\n");
	strcat(strhttphead, "cache-control: no-cache\r\n"); 
	strcat(strhttphead, "connection: keep-alive\r\n");
	if(0 == strcmp(strmethod, "post"))
	{
		char len[8] = {0};
		unsigned ulen = strlen(strdata);
		sprintf(len, "%d", ulen);		
		
		strcat(strhttphead, "content-type: application/x-www-form-urlencoded\r\n");
		strcat(strhttphead, "content-length: "); 
        strcat(strhttphead, len); 
        strcat(strhttphead, "\r\n\r\n"); 
        strcat(strhttphead, strdata); 
	}
	strcat(strhttphead, "\r\n\r\n");
	
	free(strhost);
	
	return strhttphead;	
}


//发送http请求并接受响应
char* httprequest::httpdatatransmit(char *strhttphead, const int isockfd)
{
	char* buf = (char*)malloc(bufsize);
	memset(buf, 0, bufsize);
	int ret = send(isockfd,(void *)strhttphead,strlen(strhttphead)+1,0); 
	free(strhttphead);
	if (ret < 0) { 
		debugout("%s %s %d\tsend error! error code: %d，error message: %s\n", __file__, __function__, __line__, errno, strerror(errno)); 
		close(isockfd);
		return null; 
	}
	
	while(1)
	{
		ret = recv(isockfd, (void *)buf, bufsize,0); 
		if (ret == 0) //连接关闭
		{  		
			close(isockfd);
			return null; 
		}
		else if(ret > 0) {						
			return buf; 
		}
		else if(ret < 0) //出错
		{ 
			if(errno == eintr || errno == ewouldblock || errno == eagain) {
				continue;
			}
			else {
				close(isockfd);
				return null;
			}
		}
	}
}


//从http请求url中获取主机地址，网址或者点分十进制ip地址
char* httprequest::gethostaddrfromurl(const char* strurl)
{	
	char url[urlsize] = {0};
	strcpy(url, strurl);
	
	char* straddr = strstr(url, "https://");//判断有没有https://
	if(straddr == null) {
		straddr = strstr(url, "https://");//判断有没有https://
		if(straddr != null) {
			straddr += 8;
		}
	} else {
		straddr += 7;
	}
	
	if(straddr == null) {
		straddr = url;
	}
	int ilen = strlen(straddr);
	char* strhostaddr = (char*)malloc(ilen+1);
	memset(strhostaddr, 0, ilen+1);
	for(int i=0; i<ilen+1; i++)="" {="" if(straddr[i]="=" &#39;="" &#39;)="" break;="" }="" else="" strhostaddr[i]="straddr[i];" return="" strhostaddr;="" 从http请求url中获取http请参数="" char*="" httprequest::getparamfromurl(const="" strurl)="" char="" url[urlsize]="{0};" strcpy(url,="" strurl);="" straddr="strstr(url," "http:="" ");="" 判断有没有http:="" if(straddr="=" null)="" "https:="" 判断有没有https:="" !="null)" +="8;" int="" ilen="strlen(straddr);" strparam="(char*)malloc(ilen+1);" memset(strparam,="" 0,="" ilen+1);="" ipos="-1;" for(int="" i="0;" )="" ||="" (strhostaddr[i]="" <="9" ))="" iflag="0;" free(strhostaddr);="" if(strlen(straddr)="" null;="" 判断是否为点分十进制ip地址，否则通过域名地址获取ip地址="" if((icount="=" 3)="" &&="" (iflag="=" 0))="" straddr;="" struct="" hostent="" *he="gethostbyname(straddr);" free(straddr);="" if="" (he="=" in_addr**="" addr_list="(struct" in_addr="" **)he->h_addr_list;="" addr_list[i]="" inet_ntoa(*addr_list[i]);="" 检查socketfd是否为可写不可读状态="" httprequest::socketfdcheck(const="" isockfd)="" timeval="" timeout="" ;="" fd_set="" rset,wset;="" fd_zero(&rset);="" fd_zero(&wset);="" fd_set(isockfd,="" &rset);="" &wset);="" timeout.tv_sec="3;" timeout.tv_usec="500;" iret="select(isockfd+1," &rset,="" &wset,="" null,="" &timeout);="" if(iret="" >="" 0)="" 判断socketfd是否为可写不可读状态="" iw="fd_isset(isockfd,&wset);" ir="fd_isset(isockfd,&rset);" if(iw="" !ir)="" error[4]="" socklen_t="" len="sizeof(error);" ret="getsockopt(isockfd,sol_socket,so_error,error,&len);" if(ret="=" if(!strcmp(error,="" ""))="" iret;="" 表示已经准备好的描述符数="" debugout("%s="" %s="" %d\tgetsockopt="" error="" code:%d,error="" message:%s",="" __file__,="" __function__,="" __line__,="" errno,="" strerror(errno));="" failed.="" %d\tsockfd是否在可写字符集中：%d，是否在可读字符集中：%d\t(0表示不在)\n",="" iw,="" ir);="" 0;="" 表示超时="" -1;="" select出错，所有描述符集清0="" -2;="" 其他错误="" 打印输出="" void="" httprequest::debugout(const="" *fmt,="" ...)="" #ifdef="" __debug__="" va_list="" ap;="" va_start(ap,="" fmt);="" vprintf(fmt,="" ap);="" va_end(ap);="" #endif="" httprequest::m_isocketfd="invalid_socket;" <="" pre="">

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