c語(yǔ)言可以通過(guò)post方式將json數(shù)據(jù)發(fā)送至服務(wù)器中，post方式發(fā)送的數(shù)據(jù)需要在http請(qǐng)求中添加表頭部分。表頭部分包括Content-Type和Content-Length兩個(gè)參數(shù)。

#include <stdlib.h>
#include <stdio.h>
#include <curl/curl.h>
int main(int argc, char *argv[])
{
CURL *curl;
CURLcode res;
curl_global_init(CURL_GLOBAL_DEFAULT);
curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
curl_easy_setopt(curl, CURLOPT_POST, 1);
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, "json={\"name\":\"Jack\",\"age\":28}");
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, "Content-Type: application/json");
curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, 30L);
res = curl_easy_perform(curl);
if(res != CURLE_OK)
fprintf(stderr, "curl_easy_perform() failed: %s\n",
curl_easy_strerror(res));
curl_easy_cleanup(curl);
}
curl_global_cleanup();
return 0;
}

在上述代碼中，通過(guò)curl_easy_setopt函數(shù)設(shè)置了post請(qǐng)求方式、添加了json數(shù)據(jù)、設(shè)置了Content-Type為application/json、設(shè)置Content-Length為30字節(jié)。