[C#] HttpWebRequest 클래스를 이용한 POST 전송하기.

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[C#] HttpWebRequest 클래스를 이용한 POST 전송하기

01.protected void SendSMS()

02.{

03.String[] messages = new String[6];

04.messages[0] = "행정과";         // 아이디

05.messages[1] = "암호";           // 암호

06.messages[2] = "11111111111";    // 보내는 사람 번호

07.messages[3] = "22222222222";    // 받는 사람 번호

08.messages[4] = "테스트 메시지";  // 메시지

09.messages[5] = "홍길동";         // 받는 사람 이름

10.String postData = String.Format("id={0}&pw={1}&sender={2}&receiver={3}&msg={4}&idreserve={5}", messages[0], messages[1], messages[2], messages[3], messages[4], messages[5]);

11. 

12.HttpWebRequest httpWebRequest = (HttpWebRequest) WebRequest.Create("http://localhost:38080/encoding/encoding.jsp");

13.// 인코딩 1 - UTF-8

14.byte[] sendData = UTF8Encoding.UTF8.GetBytes(postData);

15.httpWebRequest.ContentType = "application/x-www-form-urlencoded; charset=UTF-8";

16.// 인코딩 2 - EUC-KR

17.//byte[] sendData = Encoding.GetEncoding("EUC-KR").GetBytes(postData);

18.//httpWebRequest.ContentType = "application/x-www-form-urlencoded; charset=EUC-KR";

19.httpWebRequest.ContentType = "application/x-www-form-urlencoded; charset=utf-8";

20.httpWebRequest.Method = "POST";

21.// Set the content length of the string being posted.

22.httpWebRequest.ContentLength = sendData.Length;

23.Stream requestStream = httpWebRequest.GetRequestStream();

24.requestStream.Write(sendData, 0, sendData.Length);

25.requestStream.Close();

26.HttpWebResponse httpWebResponse = (HttpWebResponse) httpWebRequest.GetResponse();

27.StreamReader streamReader = new StreamReader(httpWebResponse.GetResponseStream(), Encoding.GetEncoding("EUC-KR"));    // Encoding.GetEncoding("EUC-KR")

28.string html = streamReader.ReadToEnd();

29.streamReader.Close();

30.httpWebResponse.Close();

31. 

32.text.Value = html;

33.}

This is an easy way to make a JSON POST request to a remote service using C#:

1 2 3 4 5 6 7 8 9 10

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); request.Method = "POST"; request.ContentType = "application/json; charset=utf-8"; DataContractJsonSerializer ser = new DataContractJsonSerializer(data.GetType()); MemoryStream ms = new MemoryStream(); ser.WriteObject(ms, data); String json = Encoding.UTF8.GetString(ms.ToArray()); StreamWriter writer = new StreamWriter(request.GetRequestStream()); writer.Write(json); writer.Close();

Notice that in line 4 we create an instance of DataContractJsonSerializer (Assembly: System.ServiceModel.Web) and initialize it with the type of object we are serializing as JSON to send to the service. In lines 5 and 6 the serializer writes the object into a Stream. Line 7 transforms the Stream into an UTF-8 String (as the content-type) and finally in lines 8 to 10 we send the data to the service.

약간의 문제가 발생하게 되는데

x-www-form-urlencoded 방식의 경우에 get 방식의 id=value&id2=value2 같은 방식으로 처리된다. (텍스트로)

그래서 JSON 으로 변환된 문자열을 전송할 경우에 & 문자가 있으면 의도하지 않은 에러가 발생한다.

그래서 serialize 된 문자열에서 

string postData = string.Format("shot={0}", JsonConvert.SerializeObject(shot));

                postData = postData.Replace("&", "%26");

                //string postData = string.Format("shot=TTT", JsonConvert.SerializeObject(shot));

                query_string = "exec=updateshot";

                var httpWebRequest = (HttpWebRequest)WebRequest.Create("http://shots.php?" + query_string);

                httpWebRequest.ContentType = "text/json";

                byte[] sendData = UTF8Encoding.UTF8.GetBytes(postData);

                httpWebRequest.ContentType = "application/x-www-form-urlencoded;charset=UTF-8";              

                httpWebRequest.Method = "POST";

                httpWebRequest.ContentLength = sendData.Length;

                Stream requestStream = httpWebRequest.GetRequestStream();

                requestStream.Write(sendData, 0, sendData.Length);

                requestStream.Close();

                HttpWebResponse httpWebResponse = (HttpWebResponse) httpWebRequest.GetResponse();

                StreamReader streamReader = new StreamReader(httpWebResponse.GetResponseStream(), Encoding.GetEncoding("UTF-8"));    // Encoding.GetEncoding("EUC-KR")

                string shot_id = streamReader.ReadToEnd();

                streamReader.Close();

                httpWebResponse.Close();

postData = postData.Replace("&", "%26");

처럼 처리해주면 에러를 피할 수 있다.