libcurl c++ get post

发表于 分类于

本次博主将使用 c++ 操作 libcurl 进行 get post
摘自官网: libcurl是一个免费且易于使用的客户端URL传输库，支持DICT、FILE、FTP、FTPS、GOPHER、GOPHERS、HTTP、HTTPS、IMAP、IMAPS、LDAP、LDAPS、MQTT、POP3、POP3S、RTMP、RTMPS、RTSP、SCP、SFTP、SMB、SMBS、SMTP、SMTPS、TELNET和TFTP。libcurl支持SSL证书、HTTP POST、HTTP PUT、FTP上载、基于HTTP表单的上载、代理、HTTP/2、HTTP/3、cookie、用户+密码身份验证（基本、摘要、NTLM、协商、Kerberos）、文件传输恢复、HTTP代理隧道等
本章节博主将使用 libcurl 完成 get post json post form 操作

源代码放到博文最下方了 o(￣▽￣)ブ

get

服务端代码:

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@GetMapping("/getUser")
public User getUserInfo
(
  String name,
  String address,
  @RequestHeader(name = "key1") String key1,
  @RequestHeader(name = "key2") String key2                      
) 
{
  log.info("name: {} address: {} key1:{} key2:{}", name, address, key1, key2);
  return User.builder().age(18).name(name).address(address).createTime(LocalDateTime.now()).build();
}

c++ 代码

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/**
* get request
* url url地址
* p url参数
* h header参数
* timeoutMs 超时时间
*/
const std::string get(
    const std::string& url, 
    const UrlParams& p = std::map<std::string, std::string>(),
    const HeaderParams & h = std::map<std::string, std::string>(),
    int timeoutMs = 300
)
{
    //超时时间
    curl_easy_setopt(libCurl,CURLOPT_TIMEOUT_MS, timeoutMs);
    
    //处理url参数
    const char* newUrl = handlerUrl(url, p);
    std::string resData;
    curl_easy_setopt(libCurl, CURLOPT_WRITEDATA, &resData);
    curl_easy_setopt(libCurl, CURLOPT_WRITEFUNCTION, CurlSupport::write_callback);
    curl_easy_setopt(libCurl, CURLOPT_URL, newUrl);
    
    
    //处理header参数
    struct curl_slist* headers = curl_slist_append(NULL, "Expect:");;
    handlerHeader(h, headers);
    curl_easy_setopt(libCurl, CURLOPT_HTTPHEADER, headers);
    
    CURLcode resCode = curl_easy_perform(libCurl);
    
    curl_slist_free_all(headers);
    
    if (CURLE_OK != resCode)
    {
      throw CurlSupportException(curl_easy_strerror(resCode));
    }
    else
    {
      return resData;
    }
}

测试调用

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void testGet()
{
	try
	{
		CurlSupport curl;
		//参数
		const std::map<std::string, std::string> p =
		{
			{"name",u8"张三"},
			{"address",u8"浙江杭州540."}
		};
		//header
		const std::map<std::string, std::string> h =
		{
			{"key1","key1key1key1a"},
			{"key2","key2key2key2b"}
		};

		std::string responseStr = curl.get("http://127.0.0.1:8080/getUser",p,h);
		std::cout << responseStr <<std::endl;
	}
	catch (const CurlSupportException& e)
	{
		std::cout << e.what() << std::endl;
	}
}
post json

服务端代码

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@PostMapping("/addUser")
public Boolean addUser(
    @RequestBody User user,
    @RequestHeader(name = "token1") String token1,
    @RequestHeader(name = "token2") String token2
) {
    log.info("\nuser:{} \n token1:{} token2:{}", user, token1, token2);
    return Boolean.TRUE;
}

c++ 代码

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/**
* post json
* url url地址
* h header参数
* timeoutMs 超时时间
*/
const std::string postJson
(
    const std::string& url,
    const std::string& jsonStr,
    const HeaderParams& h = std::map<std::string, std::string>(),
    int timeoutMs = 300
)
{
    //超时时间
    curl_easy_setopt(libCurl, CURLOPT_TIMEOUT_MS, timeoutMs);
    
    //处理header参数
    struct curl_slist* headers = curl_slist_append(NULL, "Expect:");
    const std::string jsonHeader = "Content-Type:application/json;charset=UTF-8";
    headers = curl_slist_append(headers, jsonHeader.c_str());
    handlerHeader(h, headers);
    curl_easy_setopt(libCurl, CURLOPT_HTTPHEADER, headers);
    curl_easy_setopt(libCurl, CURLOPT_URL, url.c_str());
    
    std::string resData;
    
    //传递json
    curl_easy_setopt(libCurl, CURLOPT_POSTFIELDS, jsonStr.c_str());
    curl_easy_setopt(libCurl, CURLOPT_WRITEDATA, &resData);
    curl_easy_setopt(libCurl, CURLOPT_WRITEFUNCTION, CurlSupport::write_callback);
    
    CURLcode resCode = curl_easy_perform(libCurl);
    
    curl_slist_free_all(headers);
    if (CURLE_OK != resCode)
    {
      throw CurlSupportException(curl_easy_strerror(resCode));
    }
    else
    {
      return resData;
    }
}

测试调用

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void testPostJson()
{
	try
	{
		CurlSupport curl;

		//jsonStr
		std::string jsonStrr = u8"{\"name\":\"李四\",\"address\":\"上海市654路\",\"age\":6}";
		
		//header
		const std::map<std::string, std::string> h =
		{
			{"token1","abc697"},
			{"token2","efv247"}
		};

		std::string responseStr = curl.postJson("http://127.0.0.1:8080/addUser",jsonStrr, h);
		std::cout << responseStr << std::endl;
	}
	catch (const CurlSupportException& e)
	{
		std::cout << e.what() << std::endl;
	}
}
post form

服务端代码

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@PostMapping("/updateUser")
public Boolean updateUser
(
    User user,
    @RequestHeader(name = "token1") String token1,
    @RequestHeader(name = "token2") String token2,
    MultipartFile[] photoList
) throws IOException {

    log.info("\nuser: {} \n token1:{} token2:{}", user, token1, token2);
    
    if (null != photoList) {
        for (MultipartFile file : photoList) {
            log.info(file.getOriginalFilename());
            file.transferTo(new File("D:\\temp\\" + file.getOriginalFilename()));
        }
    }
    return Boolean.TRUE;
}

c++ 代码

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/**
* postForm
* url url地址
* f 表单参数
* h header参数
* timeoutMs 超时时间
*/
const std::string postForm
(
    const std::string& url,
    const FormParams& f,
    const HeaderParams& h = std::map<std::string, std::string>(),
    int timeoutMs = 300
)
{
    //超时时间
    curl_easy_setopt(libCurl, CURLOPT_TIMEOUT_MS, timeoutMs);
    
    //处理header参数
    struct curl_slist* headers = curl_slist_append(NULL, "Expect:");;
    handlerHeader(h, headers);
    curl_easy_setopt(libCurl, CURLOPT_HTTPHEADER, headers);
    
    const char* charUrl = url.c_str();
    curl_mime* form = NULL;
    curl_mimepart* fieid = NULL;
    std::string resData;
    
    //创建表单
    form = curl_mime_init(libCurl);
    
    //表单参数
    for (auto item : f)
    {
        std::string name = std::get<0>(item);
        std::string value = std::get<1>(item);
        boolean isFile = std::get<2>(item);
        
        //判断是否是文件
        if (isFile)
        {
          fieid = curl_mime_addpart(form);
          curl_mime_name(fieid, name.c_str());
          curl_mime_filedata(fieid, value.c_str());
        }else {
          fieid = curl_mime_addpart(form);
          curl_mime_name(fieid, name.c_str());
          curl_mime_data(fieid, value.c_str(), CURL_ZERO_TERMINATED);
        }	
    }
    
    curl_easy_setopt(libCurl, CURLOPT_URL, charUrl);
    curl_easy_setopt(libCurl, CURLOPT_MIMEPOST, form);
    curl_easy_setopt(libCurl, CURLOPT_WRITEDATA, &resData);
    curl_easy_setopt(libCurl, CURLOPT_WRITEFUNCTION, CurlSupport::write_callback);
    
    CURLcode resCode = curl_easy_perform(libCurl);
    curl_mime_free(form);
    
    if (CURLE_OK != resCode)
    {
      throw CurlSupportException(curl_easy_strerror(resCode));
    }
    else{
      return resData;
    }
}

测试调用

源代码

服务端代码:
https://github.com/wchar-net/libcurl-cpp-example-server
c++代码
https://github.com/wchar-net/libcurl-cpp-example

具体看源代码吧 o(￣▽￣)ブ