C++使用http向服务器发送json数据

#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string>
#include <iostream>
#include <fstream>
using namespace std;
int main()
{
int sockfd = socket(AF_INET, SOCK_STREAM, 0);
// IPv4
struct sockaddr_in server_addr;
bzero(&server_addr, sizeof(server_addr));
server_addr.sin_family = AF_INET;
const char *ip = "127.0.0.1";
server_addr.sin_addr.s_addr = inet_addr(ip);
server_addr.sin_port = htons(1234);
//port
int err_log = connect(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr));
if (err_log != 0)
{
perror("connect");
close(sockfd);
return -1;
}
// message
string pre = "POST /home/ubuntu/ HTTP/1.1rn"
"Host: 127.0.0.1:1234rn"
"Content-Type: application/jsonrn"
"Content-Length: ";
string json = "{"item1":"val1", "item2":6, "image_nums":[";
ifstream ifs("image.txt");
int tmp;
while(ifs >> tmp) {
if(ifs.eof()) break;
string ss = to_string(tmp);
json += ss + ",";
}
ifs.close();
json = json.substr(0, json.length()-1) + "]" + "}";
pre += to_string(json.length()) + "rnrn" + json;
int send_ret = write(sockfd, pre.c_str(), pre.size());
cout << "send " << send_ret << endl;
// response
char recv_buf[8 * 1024] = {0};
recv(sockfd, recv_buf, sizeof(recv_buf), 0);
FILE *fd = fopen("response.json", "wb+");
fwrite(recv_buf, 1, bytes_received, fd);
fclose(fd);
close(sockfd);
return 0;
}

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