C語(yǔ)言中，通過http協(xié)議傳輸json格式的數(shù)據(jù)是很常見的場(chǎng)景。http+json實(shí)現(xiàn)數(shù)據(jù)傳輸?shù)姆绞骄哂幸子谩⒏咝У葍?yōu)點(diǎn)，本篇文章將介紹如何通過c語(yǔ)言中的http+json實(shí)現(xiàn)數(shù)據(jù)傳輸。

#include#include#include#include#include#define POST_URL "http://example.com/api/post"
#define GET_URL "http://example.com/api/get"
//發(fā)送POST請(qǐng)求
void send_post_request()
{
CURL *curl = curl_easy_init();
if(curl)
{
//設(shè)置請(qǐng)求的URL地址
curl_easy_setopt(curl, CURLOPT_URL, POST_URL);
//設(shè)置請(qǐng)求的Content-Type
struct curl_slist *headers = NULL;
headers = curl_slist_append(headers, "Content-Type: application/json");
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
//設(shè)置請(qǐng)求數(shù)據(jù)
json_object *jobj = json_object_new_object();
json_object *jstring = json_object_new_string("test");
json_object_object_add(jobj, "key1", jstring);
char *post_data = json_object_to_json_string(jobj);
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, post_data);
//發(fā)起POST請(qǐng)求
CURLcode res = curl_easy_perform(curl);
if(res != CURLE_OK)
{
fprintf(stderr, "curl_easy_perform() failed: %s\n", curl_easy_strerror(res));
}
//釋放資源
curl_easy_cleanup(curl);
json_object_put(jobj);
}
}
//發(fā)送GET請(qǐng)求
void send_get_request()
{
CURL *curl = curl_easy_init();
if(curl)
{
//設(shè)置請(qǐng)求的URL地址
curl_easy_setopt(curl, CURLOPT_URL, GET_URL);
//發(fā)起GET請(qǐng)求
CURLcode res = curl_easy_perform(curl);
if(res != CURLE_OK)
{
fprintf(stderr, "curl_easy_perform() failed: %s\n", curl_easy_strerror(res));
}
//釋放資源
curl_easy_cleanup(curl);
}
}
int main()
{
send_post_request();
send_get_request();
return 0;
}

以上代碼示例展示了常見的使用c語(yǔ)言中的curl庫(kù)和json-c庫(kù)發(fā)送http請(qǐng)求，并將json格式的數(shù)據(jù)傳輸?shù)椒?wù)器的方法。具體來說，使用curl的curl_easy_setopt函數(shù)設(shè)置請(qǐng)求的URL地址、請(qǐng)求方式、請(qǐng)求頭、請(qǐng)求數(shù)據(jù)等信息，通過json-c庫(kù)將數(shù)據(jù)轉(zhuǎn)換成json格式再發(fā)送請(qǐng)求。