프로그래매틱 방식으로 URL 내보내기 호출

프로그래밍 언어에서 URL 내보내기를 호출하여 스크립트 또는 웹 서비스에서 데이터를 동적으로 내보냅니다.

시작하기 전에

필요한 역할: 없음

이 태스크 정보

다음 절차에는 .Net 프레임워크 호출을 위해 C#에서 URL 내보내기를 호출하는 방법을 보여 주는 코드 샘플이 포함되어 있습니다.

프로시저

1. 다음 임포트를 추가합니다.

   using System.Net;
   using System.IO;

2. Download 메서드를 호출합니다.

   static void Main(string[] args)
   
        {
           // Call to DownloadFile method supplying the URL and location to save CSV file locally
           int read = DownloadFile("https://<instance>.service-now.com/incident_list.do?CSV&sysparm_query=priority=1&sysparm_orderby=assigned_to",
                        "c:\\test\\incident.csv");
       }

3. 다음과 같이 Download 메서드를 만듭니다.

   public static int DownloadFile(String url,
                                          String localFilename)
       {
           // Function will return the number of bytes processed
           // to the caller. Initialize to 0 here.
           int bytesProcessed = 0;
           // Assign values to these objects here so that they can
           // be referenced in the finally block
           Stream remoteStream = null;
           Stream localStream = null;
           WebResponse response = null;
           // Use a try/catch/finally block as both the WebRequest and Stream
           // classes throw exceptions upon error
           try
           {
               // Create a request for the specified remote file name
               WebRequest request = WebRequest.Create(url);
               // Create the credentials required for Basic Authentication
               System.Net.ICredentials cred = new System.Net.NetworkCredential("user_name", "password");
               // Add the credentials to the request
               request.Credentials = cred;
               if (request != null)
               {
                   // Send the request to the server and retrieve the
                   // WebResponse object 
                   response = request.GetResponse();
                   if (response != null)
                   {
                       // Once the WebResponse object has been retrieved,
                       // get the stream object associated with the response's data
                       remoteStream = response.GetResponseStream();
                       // Create the local file
                       localStream = File.Create(localFilename);
                       // Allocate a 1k buffer
                       byte[] buffer = new byte[1024];
                       int bytesRead;
                       // Simple do/while loop to read from stream until
                       // no bytes are returned
                       do
                       {
                           // Read data (up to 1k) from the stream
                           bytesRead = remoteStream.Read(buffer, 0, buffer.Length);
                           // Write the data to the local file
                           localStream.Write(buffer, 0, bytesRead);
                           // Increment total bytes processed
                           bytesProcessed += bytesRead;
                       } while (bytesRead > 0);
                   }
               }
           }
           catch (Exception e)
           {
               Console.WriteLine(e.Message);
           }
           finally
           {
               // Close the response and streams objects here 
               // to make sure they're closed even if an exception
               // is thrown at some point
               if (response != null) response.Close();
               if (remoteStream != null) remoteStream.Close();
               if (localStream != null) localStream.Close();
           }
           // Return total bytes processed to caller.
           return bytesProcessed;
       }