(Java) Initiate Resumable Upload Session

See more Google Cloud Storage Examples

For more information, see https://cloud.google.com/storage/docs/performing-resumable-uploads

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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[])
  {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkHttp http = new CkHttp();

    CkJsonObject jsonToken = new CkJsonObject();
    boolean success = jsonToken.LoadFile("qa_data/tokens/googleCloudStorage.json");
    if (success == false) {
        System.out.println(jsonToken.lastErrorText());
        return;
        }

    CkJsonObject jsonMetaData = new CkJsonObject();
    jsonMetaData.UpdateString("contentType","image/jpeg");

    // Adds the "Authorization: Bearer <access_token>" header..
    http.put_AuthToken(jsonToken.stringOf("access_token"));

    http.SetUrlVar("bucket_name","chilkat-bucket-b");
    http.SetUrlVar("object_name","penguins2.jpg");
    String url = "https://storage.googleapis.com/upload/storage/v1/b/{$bucket_name}/o?uploadType=resumable&name={$object_name}";
    CkHttpResponse resp = http.PText("POST",url,jsonMetaData.emit(),"utf-8","application/json",false,false);
    if (http.get_LastMethodSuccess() == false) {
        System.out.println(http.lastErrorText());
        return;
        }

    int statusCode = resp.get_StatusCode();
    System.out.println("response status code = " + statusCode);

    String sessionUrl = "";

    if (statusCode != 200) {
        System.out.println(resp.bodyStr());
        }
    else {
        // The session URL will be used to upload the file in chunks, in subsequent HTTP POSTs...
        sessionUrl = resp.getHeaderField("Location");
        System.out.println("Session URL = " + sessionUrl);
        }
  }
}