使用boost做post/get请求开发笔记

话不多说 上代码：代码也很简单，可以直接使用编译

#include <iostream>#include <istream>#include <ostream>#include <string>#include <boost/asio.hpp>#include <boost/bind.hpp>using boost::asio::ip::tcp;class client{public:  client(boost::asio::io_service& io_service,      const std::string& server, const std::string& path)    : resolver_(io_service),      socket_(io_service)  {    // Form the request. We specify the "Connection: close" header so that the    // server will close the socket after transmitting the response. This will    // allow us to treat all data up until the EOF as the content.    std::ostream request_stream(&request_);    string postString = "tips=notips&messageType=targetResult&targetResult=passwdvideo" ;    request_stream << "POST " << path << " HTTP/1.1\r\n";    request_stream << "Host: " << server << "\r\n";    request_stream << "Accept: */*\r\n";    request_stream << "Content-Type: " << "application/x-www-form-urlencoded" << "\r\n";    request_stream << "Content-Length: " << postString.length() << "\r\n";    request_stream << "Connection: keep-alive\r\n\r\n";    request_stream << postString ;    // Start an asynchronous resolve to translate the server and service names    // into a list of endpoints.    tcp::resolver::query query("192.168.1.46", "8187");    resolver_.async_resolve(query,        boost::bind(&client::handle_resolve, this,          boost::asio::placeholders::error,          boost::asio::placeholders::iterator));  }private:  void handle_resolve(const boost::system::error_code& err,      tcp::resolver::iterator endpoint_iterator)  {    if (!err)    {      // Attempt a connection to each endpoint in the list until we      // successfully establish a connection.      boost::asio::async_connect(socket_, endpoint_iterator,          boost::bind(&client::handle_connect, this,            boost::asio::placeholders::error));    }    else    {      std::cout << "Error: " << err.message() << "\n";    }  }  void handle_connect(const boost::system::error_code& err)  {    if (!err)    {      // The connection was successful. Send the request.      boost::asio::async_write(socket_, request_,          boost::bind(&client::handle_write_request, this,            boost::asio::placeholders::error));    }    else    {      std::cout << "Error: " << err.message() << "\n";    }  }  void handle_write_request(const boost::system::error_code& err)  {    if (!err)    {      // Read the response status line. The response_ streambuf will      // automatically grow to accommodate the entire line. The growth may be      // limited by passing a maximum size to the streambuf constructor.      boost::asio::async_read_until(socket_, response_, "\r\n",          boost::bind(&client::handle_read_status_line, this,            boost::asio::placeholders::error));    }    else    {      std::cout << "Error: " << err.message() << "\n";    }  }  void handle_read_status_line(const boost::system::error_code& err)  {    if (!err)    {      // Check that response is OK.      std::istream response_stream(&response_);      std::string http_version;      response_stream >> http_version;      unsigned int status_code;      response_stream >> status_code;      std::string status_message;      std::getline(response_stream, status_message);      if (!response_stream || http_version.substr(0, 5) != "HTTP/")      {        std::cout << "Invalid response\n";        return;      }      if (status_code != 200)      {        std::cout << "Response returned with status code ";        std::cout << status_code << "\n";        return;      }      // Read the response headers, which are terminated by a blank line.      boost::asio::async_read_until(socket_, response_, "\r\n\r\n",          boost::bind(&client::handle_read_headers, this,            boost::asio::placeholders::error));    }    else    {      std::cout << "Error: " << err << "\n";    }  }  void handle_read_headers(const boost::system::error_code& err)  {    if (!err)    {      // Process the response headers.      std::istream response_stream(&response_);      std::string header;      while (std::getline(response_stream, header) && header != "\r")        std::cout << header << "\n";      std::cout << "\n";      // Write whatever content we already have to output.      if (response_.size() > 0)        std::cout << &response_;      // Start reading remaining data until EOF.      boost::asio::async_read(socket_, response_,          boost::asio::transfer_at_least(1),          boost::bind(&client::handle_read_content, this,            boost::asio::placeholders::error));    }    else    {      std::cout << "Error: " << err << "\n";    }  }  void handle_read_content(const boost::system::error_code& err)  {    if (!err)    {      printf("\n\ncontent is : \n\n");      // Write all of the data that has been read so far.      std::cout << &response_;      // Continue reading remaining data until EOF.      boost::asio::async_read(socket_, response_,          boost::asio::transfer_at_least(1),          boost::bind(&client::handle_read_content, this,            boost::asio::placeholders::error));    }    else if (err != boost::asio::error::eof)    {      std::cout << "Error: " << err << "\n";    }  }  tcp::resolver resolver_;  tcp::socket socket_;  boost::asio::streambuf request_;  boost::asio::streambuf response_;};int main(int argc, char* argv[]){  try  {    boost::asio::io_service io_service;    client c(io_service, "192.168.1.46:8187", "/handle_post_request");//    client c(io_service, "192.168.1.46:8187", "/");    io_service.run();  }  catch (std::exception& e)  {    std::cout << "Exception: " << e.what() << "\n";  }  return 0;}

遍历缓冲区序列的字节
buffers_iterator<>类模板可用于像遍历连续字节序列一样遍历缓冲区序列(如MutableBufferSequence 或 ConstBufferSequence).并提供了buffers_begin() 和 buffers_end()帮助函数, 会自动推断buffers_iterator<>的模板参数.


例如,从socket中读取一行数据,存入std::string中:

boost::asio::streambuf sb;...std::size_t n = boost::asio::read_until(sock, sb, '\n');boost::asio::streambuf::const_buffers_type bufs = sb.data();std::string line(    boost::asio::buffers_begin(bufs),    boost::asio::buffers_begin(bufs) + n);

把他整理成了 头文件 和源文件 分开的形式，方便 直接使用：

#include<boostHttpClient.h>boostHttpclient_c::boostHttpclient_c(boost::asio::io_service& io_service,      const std::string& server, const std::string& path)    : resolver_(io_service),      socket_(io_service){// Form the request. We specify the "Connection: close" header so that the// server will close the socket after transmitting the response. This will// allow us to treat all data up until the EOF as the content.std::ostream request_stream(&request_);string postString = "tips=notips&messageType=targetResult&targetResult=passwdvideo" ;request_stream << "POST " << path << " HTTP/1.1\r\n";request_stream << "Host: " << server << "\r\n";request_stream << "Accept: */*\r\n";request_stream << "Content-Type: " << "application/x-www-form-urlencoded" << "\r\n";request_stream << "Content-Length: " << postString.length() << "\r\n";request_stream << "Connection: keep-alive\r\n\r\n";request_stream << postString ;// Start an asynchronous resolve to translate the server and service names// into a list of endpoints.tcp::resolver::query query("192.168.1.46", "8187");resolver_.async_resolve(query,boost::bind(&boostHttpclient_c::handle_resolve, this,  boost::asio::placeholders::error,  boost::asio::placeholders::iterator));}void boostHttpclient_c::handle_resolve(const boost::system::error_code& err,  tcp::resolver::iterator endpoint_iterator){if (!err){  // Attempt a connection to each endpoint in the list until we  // successfully establish a connection.  boost::asio::async_connect(socket_, endpoint_iterator,  boost::bind(&boostHttpclient_c::handle_connect, this,boost::asio::placeholders::error));}else{  std::cout << "Error: " << err.message() << "\n";}}void boostHttpclient_c::handle_connect(const boost::system::error_code& err){if (!err){  // The connection was successful. Send the request.  boost::asio::async_write(socket_, request_,  boost::bind(&boostHttpclient_c::handle_write_request, this,boost::asio::placeholders::error));}else{  std::cout << "Error: " << err.message() << "\n";}}void boostHttpclient_c::handle_write_request(const boost::system::error_code& err){if (!err){  // Read the response status line. The response_ streambuf will  // automatically grow to accommodate the entire line. The growth may be  // limited by passing a maximum size to the streambuf constructor.  printf("http write OK start listen \n ");  boost::asio::async_read_until(socket_, response_, "\r\n",  boost::bind(&boostHttpclient_c::handle_read_status_line, this,boost::asio::placeholders::error));}else{  std::cout << "Error: " << err.message() << "\n";}}void boostHttpclient_c::handle_read_status_line(const boost::system::error_code& err){if (!err){  // Check that response is OK.  std::istream response_stream(&response_);  std::string http_version;  response_stream >> http_version;  unsigned int status_code;  response_stream >> status_code;  std::string status_message;  std::getline(response_stream, status_message);  if (!response_stream || http_version.substr(0, 5) != "HTTP/")  {std::cout << "Invalid response\n";return;  }  if (status_code != 200)  {std::cout << "Response returned with status code ";std::cout << status_code << "\n";return;  }  printf("response headers get OK \n ");  // Read the response headers, which are terminated by a blank line.  boost::asio::async_read_until(socket_, response_, "\r\n\r\n",  boost::bind(&boostHttpclient_c::handle_read_headers, this,boost::asio::placeholders::error));}else{  std::cout << "Error: " << err << "\n";}}void boostHttpclient_c::handle_read_headers(const boost::system::error_code& err){if (!err){  // Process the response headers.  std::istream response_stream(&response_);  std::string header;  while (std::getline(response_stream, header) && header != "\r")std::cout << header << "\n";  std::cout << "\n";  // Write whatever content we already have to output.//      if (response_.size() > 0){////      std::cout << &response_;//      boost::asio::streambuf::const_buffers_type bufs = response_.data();//      std::string line(//          boost::asio::buffers_begin(bufs),//          boost::asio::buffers_begin(bufs) + response_.size());//      std::cout << line;//      }  // Start reading remaining data until EOF.  boost::asio::async_read(socket_, response_,  boost::asio::transfer_at_least(1),  boost::bind(&boostHttpclient_c::handle_read_content, this,boost::asio::placeholders::error));}else{  std::cout << "Error: " << err << "\n";}}void boostHttpclient_c::handle_read_content(const boost::system::error_code& err){if (!err){  // Write all of the data that has been read so far.//      std::cout << &response_;  boost::asio::streambuf::const_buffers_type bufs = response_.data();  std::string line(  boost::asio::buffers_begin(bufs),  boost::asio::buffers_begin(bufs) + response_.size());  if(line.find("\r\n\r\n")!=string::npos){std::cout << line;regex expression("^[\{](.*)[\}]$");cmatch what;if(regex_search(line.c_str(),what,expression)){//regex_match ： 是对整个输入块的匹配，整个块如不匹配则不能成功for(unsigned int i=0;i<what.size();i++)cout<<"str match is :"<<what[i].str()<<endl;printf("\n----\n");}else{cout<<"Error Match"<<endl;}//  zoomInfo_t zoomInfo ; PointInfo_t tmpPointInfo ; int sceneWidth ,sceneHeight,WatchZoneID ;//  list<PointInfo_t> *tmpZoom = &zoomInfo.zoomPonitArray ;//  cJSON *root = cJSON_Parse(what[0].str().c_str());//  if(root==NULL){//  return ;//  }////  cJSON *tmp = cJSON_GetObjectItem(root,"sceneWidth") ;//  if(tmp!=NULL){//  sceneWidth = tmp->valueint ;//  printf("width:%d \n",sceneWidth);//  }else{//  return  ;//  }//  tmp = cJSON_GetObjectItem(root,"sceneHeight");//  if(tmp!=NULL){//  sceneHeight = tmp->valueint ;//  printf("height:%d \n",sceneHeight);//  }else{////  }  }  // Continue reading remaining data until EOF.  boost::asio::async_read(socket_, response_,  boost::asio::transfer_at_least(1),  boost::bind(&boostHttpclient_c::handle_read_content, this,boost::asio::placeholders::error));}else if (err != boost::asio::error::eof){  std::cout << "Error: " << err << "\n";}}int main(int argc, char* argv[]){  try  {    boost::asio::io_service io_service;    boostHttpclient_c c(io_service, "192.168.1.46:8187", "/handle_post_request");//    client c(io_service, "192.168.1.46:8187", "/");    io_service.run();  }  catch (std::exception& e)  {    std::cout << "Exception: " << e.what() << "\n";  }  return 0;}

头文件：

#ifndef SRC_HTTPCLIENT_BOOSTHTTPCLIENT_H_#define SRC_HTTPCLIENT_BOOSTHTTPCLIENT_H_#include <iostream>#include <istream>#include <ostream>#include <string>#include <boost/asio.hpp>#include <boost/bind.hpp>#include <cJSON.h>#include <boost/regex.hpp>#include <string>#include <iostream>using boost::asio::ip::tcp;using namespace std;using namespace boost;class boostHttpclient_c{public:boostHttpclient_c(boost::asio::io_service& io_service,      const std::string& server, const std::string& path);private:  void handle_resolve(const boost::system::error_code& err,      tcp::resolver::iterator endpoint_iterator);  void handle_connect(const boost::system::error_code& err);  void handle_write_request(const boost::system::error_code& err);  void handle_read_status_line(const boost::system::error_code& err);  void handle_read_headers(const boost::system::error_code& err);  void handle_read_content(const boost::system::error_code& err);  tcp::resolver resolver_;  tcp::socket socket_;  boost::asio::streambuf request_;  boost::asio::streambuf response_;};#endif /* SRC_HTTPCLIENT_BOOSTHTTPCLIENT_H_ */

参考文章：

如何使用SOCKET 发送HTTP1.1 GET POST请求包

http://blog.csdn.net/yc0188/article/details/4741871