Java

REST Asynchronous Streaming Upload File

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Demonstrates how to asynchronous streaming upload a file to cloud storage. This particular example demonstrates an upload to the Azure Cloud Storage service. The same concepts apply to S3, Google Cloud, and Google Drive. Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkRest rest = new CkRest();

    // Connect to the Azure Storage Blob Service
    boolean bTls = true;
    int port = 443;
    boolean bAutoReconnect = true;
    // In this example, the storage account name is "chilkat".
    success = rest.Connect("chilkat.blob.core.windows.net",port,bTls,bAutoReconnect);
    if (success != true) {
        System.out.println(rest.lastErrorText());
        return;
        }

    // Provide Azure Cloud credentials for the REST call.
    CkAuthAzureStorage azAuth = new CkAuthAzureStorage();
    azAuth.put_AccessKey("AZURE_ACCESS_KEY");
    // The account name used here should match the 1st part of the domain passed in the call to Connect (above).
    azAuth.put_Account("chilkat");
    azAuth.put_Scheme("SharedKey");
    azAuth.put_Service("Blob");
    // This causes the "x-ms-version: 2021-08-06" header to be automatically added.
    azAuth.put_XMsVersion("2021-08-06");
    success = rest.SetAuthAzureStorage(azAuth);

    // Set some request headers.
    success = rest.AddHeader("x-ms-blob-content-disposition","attachment; filename=\"thisIsATest.txt\"");
    success = rest.AddHeader("x-ms-blob-type","BlockBlob");
    success = rest.AddHeader("x-ms-meta-m1","v1");
    success = rest.AddHeader("x-ms-meta-m2","v2");

    // Note: The application does not need to explicitly set the following
    // headers: x-ms-date, Authorization, and Content-Length.  These headers
    // are automatically set by Chilkat.

    CkStream sendStream = new CkStream();

    // Define the source data for the stream to be a file.
    sendStream.put_SourceFile("qa_data/hamlet.xml");

    // Create a background thread task to upload from the stream
    // The name of the Azure storage container is "test".
    CkTask task = rest.FullRequestStreamAsync("PUT","/test/thisIsATest.txt",sendStream);

    // Start the task. 
    success = task.Run();

    // In this example, we'll simply sleep and periodically
    // check to see if the REST upload if finished.
    int curPctDone = 0;
    while (task.get_Finished() != true) {
        task.SleepMs(100);
        }

    // Check to see if the call to FullRequestStream in the background thread pool succeeded.
    if (task.get_TaskSuccess() != true) {
        // Show what would've been the LastErrorText had FullRequestStream been called synchronously
        System.out.println(task.resultErrorText());

        return;
        }

    int responseStatusCode = rest.get_ResponseStatusCode();

    // When successful, the Azure Storage service will respond with a 201 response code,
    // with an empty body.  Therefore, in the success condition, the responseStr is empty.
    if (responseStatusCode == 201) {
        System.out.println("File uploaded.");
        }
    else {
        // It failed, so examine the response body, if one was returned:
        // Given that FullRequestStream returns a string, the return value is obtained via GetResultString.
        String responseBodyStr = task.getResultString();
        System.out.println("response body (if any): " + responseBodyStr);

        // Examine the request/response to see what happened.
        System.out.println("response status code = " + rest.get_ResponseStatusCode());
        System.out.println("response status text = " + rest.responseStatusText());
        System.out.println("response header: " + rest.responseHeader());
        System.out.println("---");
        System.out.println("LastRequestStartLine: " + rest.lastRequestStartLine());
        System.out.println("LastRequestHeader: " + rest.lastRequestHeader());
        }
  }
}