关于Http协议的get方法和post方法的区别和用法

(一)get方法和post方法简介

   查看了MSDN，并且实际写了一番程序，才明白get方法和post方法的不同。其实二者实现的功能相同，都是客户端提交数据库给服务器端，只是实现的机制不同而已。get方法实际上就是通过网页的URL地址实现数据的传送，而服务器端实现从URL地址中解析数据；而post方法则是通过表单的方式提交，数据采取加密方式传送，服务器接到请求后解析数据。从安全角度上看，post方法更安全，get方法可以直接从浏览器直接提交数据，而post方法则必须从网页提交表单。

(二)get方法和post方法实现

   啰嗦了一通，还是讲讲两种方法如何实现的吧。

1、get方法VC实现

   闲话少说，直接看代码，VC6.0标准类库函数CInternetSession,更详细的用法，请查看MSDN。

 

 CInternetSession  tInternet;

 CStdioFile*       tFile;

 char     tChars[2056];

 

 memset(tChars,0,2056);

 sprintf(tChars,"%s","http://127.0.0.1:8080/app?username=123&password=123&data=111111111111");

 tFile = tInternet.OpenURL(tChars,1, INTERNET_FLAG_TRANSFER_ASCII,NULL,0); 

 memset(tChars,0,2056);

 tFile->Read(tChars,2056);

 

    发送的超链接中，app是数据应用程序部署，在数据库端要有该程序的响应，数据库才会接收数据。程序的数据已经保存在了该URL中。

   其实发送URL的方法有很多，API函数，C++ Builder中的空间都可以实现该功能。

2、post方法实现

    (1)、仍然使用CInternetSession类     

     char chHeader[128];

     char chData[128];

     char tChars[128];

 

     memset(tChars,0,128);

     CInternetSession session;

     CHttpConnection* pConnection=NULL;

     CHttpFile* pFile=NULL;

     INTERNET_PORT nPort=8080;

 

     strcpy(chHeader,"Content-Type: application/x-www-form-urlencoded");

     strcpy(chData,"username=123&password=123&data=123456789012345");

 

     pConnection = session.GetHttpConnection("127.0.0.1",nPort);

     pFile = pConnection->OpenRequest(CHttpConnection::HTTP_VERB_POST,"/app");

     pFile->SendRequest(chHeader,(DWORD)strlen(chHeader),(LPVOID *)chData,strlen(chData));

     pFile->Read(tChars,128);

     session.Close();

(2)、使用TCP/IP协议传输数据

     SOCKADDR_IN   saServer;  

     LPHOSTENT     lphostent;  

     WSADATA       wsadata;  

     SOCKET        hsocket; 

     int           nRet;  

     const         char*   host_name="127.0.0.1";  

     char*        req=

                 "POST http://127.0.0.1:8080/app?username=123&password=123&data=111111111111   HTTP/1.1rn"  

                 "From:   localrn"  

                 "User-Agent:   receiver/Receiver/1.1rn"  

                 "Content-Type:   application/x-www-form-urlencodedrn"  

                 "Content-Length:   0rnrn";  

 

     char         tChars[128];

     if(WSAStartup(winsock_version,&wsadata))  

     {

          MessageBox("can't   initial   socket");

     }

 

     lphostent=gethostbyname(host_name);  

     if(lphostent==NULL)  

     {

          MessageBox("lphostent   is   null");

     }

 

     hsocket   =   socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);  

     saServer.sin_family   =   AF_INET;  

     saServer.sin_port   =   htons(8080);  

     saServer.sin_addr   =   *((LPIN_ADDR)*lphostent->h_addr_list);  

 

     nRet = connect(hsocket, (LPSOCKADDR)&saServer, sizeof(SOCKADDR_IN));  

     if(nRet == SOCKET_ERROR)  

     {   

          MessageBox("Can't connect"); 

          closesocket(hsocket);  

          return;  

     }  

     else   

     {

           MessageBox("connected   with host");

     }

     nRet = send(hsocket, req, strlen(req), 0);  

     if(nRet == SOCKET_ERROR)  

     {  

          MessageBox("send()   failed");

          closesocket(hsocket);  

     }  

     else  

     {

          MessageBox("send()   OK");

     }

 

     char   dest[1000];  

     nRet=0;  

     while(nRet>0)  

    {  

          nRet=recv(hsocket,(LPSTR)dest,sizeof(dest),0);  

          if(nRet>0)  

          { 

              dest[nRet]=0;

          }   

          else  

          {

              dest[0]=0;

          }  

          sprintf(tChars,"Received   bytes:%d",nRet);

          MessageBox(tChars);

          sprintf(tChars,"Result:%s",dest);  

          MessageBox(tChars);

     }  

(2)、使用API函数

      HINTERNET hInternetOpen = InternetOpen("http://127.0.0.1:8080/app",

           INTERNET_OPEN_TYPE_PRECONFIG,

           NULL,

           NULL,

           0);

      if(hInternetOpen < 0 )

      {

         MessageBox("Can't open the page");

      }

      HINTERNET hInternetConnect = InternetConnect(hInternetOpen,

           "127.0.0.1",

            8080,

            NULL,

           "HTTP/1.1",

            INTERNET_SERVICE_HTTP,

            0,

            0);

      if(hInternetConnect < 0 )

      {

         MessageBox("Can't connect to the server");

      }

      HINTERNET  hHttpOpenRequest = HttpOpenRequest(hInternetConnect,

            "POST",

            "/IFCS/IMEICheck",

            "HTTP/1.1",

             NULL,

             0,

             INTERNET_FLAG_RELOAD,

             0);

      if(hHttpOpenRequest < 0 )

      {

          MessageBox("Open request fail");

       } 

   

      char  chData[128] = "username=123&password=123&data=123456789000001";

      DWORD len = strlen(chData);

      int bRet = HttpSendRequest(hHttpOpenRequest,

            "Content-Type:   application/x-www-form-urlencodedrn",

             strlen("Content-Type:   application/x-www-form-urlencodedrn"),

            (LPVOID *)chData,

            len);

      char tChars[128];

      memset(tChars,0,128);

      DWORD dwReadLen;

      InternetReadFile(hHttpOpenRequest,(LPVOID *)tChars,128,&dwReadLen);

      if(dwReadLen > 0)

      {

          MessageBox(tChars);

       }

      else

      {

         MessageBox("Read the reply fail");

       }

      InternetCloseHandle(hHttpOpenRequest);

      InternetCloseHandle(hInternetConnect);

      InternetCloseHandle(hInternetOpen);